fix: update PKGBUILD to use libvieter

Reviewed-on: vieter-v/vieter#360

.clang-format

@@ -0,0 +1,4 @@
+# To stay consistent with the V formatting style, we use tabs
+UseTab: Always
+IndentWidth: 4
+TabWidth: 4

.editorconfig

@@ -5,6 +5,5 @@ root = true
 end_of_line = lf
 insert_final_newline = true
 
-[*.v]
-# vfmt wants it :(
+[*.{v,c,h}]
 indent_style = tab

.gitignore

@@ -1,4 +1,4 @@
-*.c
+vieter.c
 /data/
 
 # Build artifacts

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "docs/themes/hugo-book"]
 	path = docs/themes/hugo-book
 	url = https://github.com/alex-shpak/hugo-book
+[submodule "src/libvieter"]
+	path = src/libvieter
+	url = https://git.rustybever.be/vieter-v/libvieter

.woodpecker/arch-rel.yml

@@ -10,6 +10,7 @@ skip_clone: true
 pipeline:
   build:
     image: 'git.rustybever.be/vieter-v/vieter-builder'
+    pull: true
     commands:
       # Add the vieter repository so we can use the compiler
       - echo -e '[vieter]\nServer = https://arch.r8r.be/$repo/$arch\nSigLevel = Optional' >> /etc/pacman.conf

.woodpecker/arch.yml

@@ -10,6 +10,7 @@ skip_clone: true
 pipeline:
   build:
     image: 'git.rustybever.be/vieter-v/vieter-builder'
+    pull: true
     commands:
       # Add the vieter repository so we can use the compiler
       - echo -e '[vieter]\nServer = https://arch.r8r.be/$repo/$arch\nSigLevel = Optional' >> /etc/pacman.conf

.woodpecker/build.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 matrix:
   PLATFORM:
@@ -57,7 +57,7 @@ pipeline:
 
       - export OBJ_PATH="/vieter/commits/$CI_COMMIT_SHA/vieter-$(echo '${PLATFORM}' | sed 's:/:-:g')"
       - export SIG_STRING="PUT\n\n$CONTENT_TYPE\n$DATE\n$OBJ_PATH"
-      - export SIGNATURE="$(echo -en $SIG_STRING | openssl sha1 -hmac $S3_PASSWORD -binary | base64)"
+      - export SIGNATURE="$(echo -en $SIG_STRING | openssl dgst -sha1 -hmac $S3_PASSWORD -binary | base64)"
       - >
         curl 
         --silent

.woodpecker/docs.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 platform: 'linux/amd64'
 branches:
@@ -21,8 +21,9 @@ pipeline:
       - make api-docs
 
   slate-docs:
-    image: 'slatedocs/slate'
+    image: 'slatedocs/slate:v2.13.0'
     group: 'generate'
+    # Slate requires a specific directory to run in
     commands:
       - cd docs/api
       - bundle exec middleman build --clean

.woodpecker/gitea.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 platform: 'linux/amd64'
 branches: [ 'main' ]

.woodpecker/lint.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 # These checks already get performed on the feature branches
 branches:

.woodpecker/man.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 platform: 'linux/amd64'
 branches:
@@ -8,15 +8,21 @@ branches:
 depends_on:
   - build
 
-skip_clone: true
-
 pipeline:
-  generate:
+  install-modules:
     image: *vlang_image
     pull: true
     commands:
-      - curl -o vieter -L "https://s3.rustybever.be/vieter/commits/$CI_COMMIT_SHA/vieter-linux-amd64"
-      - chmod +x vieter
+      - export VMODULES=$PWD/.vmodules
+      - 'cd src && v install'
+
+  generate:
+    image: *vlang_image
+    commands:
+      # - curl -o vieter -L "https://s3.rustybever.be/vieter/commits/$CI_COMMIT_SHA/vieter-linux-amd64"
+      # - chmod +x vieter
+      - export VMODULES=$PWD/.vmodules
+      - make
       - ./vieter man man
       - cd man
 

.woodpecker/test.yml

@@ -1,5 +1,5 @@
 variables:
-  - &vlang_image 'git.rustybever.be/chewing_bever/vlang:0.3.2'
+  - &vlang_image 'git.rustybever.be/vieter/vlang:5d4c9dc9fc11bf8648541c934adb64f27cb94e37-alpine3.17'
 
 matrix:
   PLATFORM:

CHANGELOG.md

@@ -7,6 +7,31 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://git.rustybever.be/vieter-v/vieter/src/branch/dev)
 
+## [0.6.0](https://git.rustybever.be/vieter-v/vieter/src/tag/0.6.0)
+
+### Added
+
+* Metrics endpoint for Prometheus integration
+* Search in list of targets using API & CLI
+* Allow filtering targets by arch value
+* Configurable global timeout for builds
+
+### Changed
+
+* Rewrote cron expression logic in C
+* Updated codebase to V commit after 0.3.3
+* Agents now use worker threads and no longer spawn a new thread for every
+  build
+
+### Fixed
+
+* Package upload now fails if TCP connection is closed before all bytes have
+  been received
+
+### Removed
+
+* Deprecated cron daemon
+
 ## [0.5.0](https://git.rustybever.be/vieter-v/vieter/src/tag/0.5.0)
 
 ### Added

Makefile

@@ -1,16 +1,20 @@
 # =====CONFIG=====
 SRC_DIR := src
-SOURCES != find '$(SRC_DIR)' -iname '*.v'
+SRCS != find '$(SRC_DIR)' -iname '*.v'
 
 V_PATH ?= v
-V := $(V_PATH) -showcc -gc boehm -W -d use_openssl -skip-unused
+V := $(V_PATH) -showcc -gc boehm -d use_openssl -skip-unused
 
 all: vieter
 
 
 # =====COMPILATION=====
+.PHONY: libvieter
+libvieter:
+	make -C '$(SRC_DIR)/libvieter' CFLAGS='-O3' 
+
 # Regular binary
-vieter: $(SOURCES)
+vieter: $(SOURCES) libvieter
 	$(V) -g -o vieter $(SRC_DIR)
 
 # Debug build using gcc
@@ -18,7 +22,7 @@ vieter: $(SOURCES)
 # multi-threaded and causes issues when running vieter inside gdb.
 .PHONY: debug
 debug: dvieter
-dvieter: $(SOURCES)
+dvieter: $(SOURCES) libvieter
 	$(V_PATH) -showcc -keepc -cg -o dvieter $(SRC_DIR)
 
 # Run the debug build inside gdb
@@ -29,12 +33,12 @@ gdb: dvieter
 # Optimised production build
 .PHONY: prod
 prod: pvieter
-pvieter: $(SOURCES)
+pvieter: $(SOURCES) libvieter
 	$(V) -o pvieter -prod $(SRC_DIR)
 
 # Only generate C code
 .PHONY: c
-c: $(SOURCES)
+c: $(SOURCES) libvieter
 	$(V) -o vieter.c $(SRC_DIR)
 
 
@@ -67,6 +71,7 @@ man: vieter
 
 
 # =====OTHER=====
+# Linting
 .PHONY: lint
 lint:
 	$(V) fmt -verify $(SRC_DIR)
@@ -74,18 +79,24 @@ lint:
 	$(V_PATH) missdoc -p $(SRC_DIR)
 	@ [ $$($(V_PATH) missdoc -p $(SRC_DIR) | wc -l) = 0 ]
 
-# Format the V codebase
+
+# Formatting
 .PHONY: fmt
 fmt:
 	$(V) fmt -w $(SRC_DIR)
 
-.PHONY: test
-test:
-	$(V) test $(SRC_DIR)
 
+# Testing
+.PHONY: test
+test: libvieter
+	$(V) -g test $(SRC_DIR)
+
+
+# Cleaning
 .PHONY: clean
 clean:
 	rm -rf 'data' 'vieter' 'dvieter' 'pvieter' 'vieter.c' 'pkg' 'src/vieter' *.pkg.tar.zst 'suvieter' 'afvieter' '$(SRC_DIR)/_docs' 'docs/public'
+	make -C '$(SRC_DIR)/libvieter' clean
 
 
 # =====EXPERIMENTAL=====

PKGBUILD

@@ -3,21 +3,31 @@
 
 pkgbase='vieter'
 pkgname='vieter'
-pkgver='0.5.0'
+pkgver='0.6.0'
 pkgrel=1
 pkgdesc="Lightweight Arch repository server & package build system"
 depends=('glibc' 'openssl' 'libarchive' 'sqlite')
-makedepends=('git' 'vlang')
+makedepends=('git' 'vieter-vlang')
 arch=('x86_64' 'aarch64')
 url='https://git.rustybever.be/vieter-v/vieter'
 license=('AGPL3')
-source=("$pkgname::git+https://git.rustybever.be/vieter-v/vieter#tag=${pkgver//_/-}")
-md5sums=('SKIP')
+source=(
+    "$pkgname::git+https://git.rustybever.be/vieter-v/vieter#tag=${pkgver//_/-}"
+    "libvieter::git+https://git.rustybever.be/vieter-v/libvieter"
+)
+md5sums=('SKIP' 'SKIP')
 
 prepare() {
-    export VMODULES="$srcdir/.vmodules"
+    cd "${pkgname}"
 
-    cd "$pkgname/src" && v install
+    # Add the libvieter submodule
+    git submodule init
+    git config submodules.src/libvieter.url "${srcdir}/libvieter"
+    git -c protocol.file.allow=always submodule update
+
+    export VMODULES="${srcdir}/.vmodules"
+
+    cd src && v install
 }
 
 build() {

PKGBUILD.dev

@@ -7,31 +7,41 @@ pkgver=0.2.0.r25.g20112b8
 pkgrel=1
 pkgdesc="Lightweight Arch repository server & package build system (development version)"
 depends=('glibc' 'openssl' 'libarchive' 'sqlite')
-makedepends=('git' 'vlang')
+makedepends=('git' 'vieter-vlang')
 arch=('x86_64' 'aarch64')
 url='https://git.rustybever.be/vieter-v/vieter'
 license=('AGPL3')
-source=("$pkgname::git+https://git.rustybever.be/vieter-v/vieter#branch=dev")
-md5sums=('SKIP')
+source=(
+    "${pkgname}::git+https://git.rustybever.be/vieter-v/vieter#branch=dev"
+    "libvieter::git+https://git.rustybever.be/vieter-v/libvieter"
+)
+md5sums=('SKIP' 'SKIP')
 provides=('vieter')
 conflicts=('vieter')
 
 pkgver() {
-    cd "$pkgname"
+    cd "${pkgname}"
 
     git describe --long --tags | sed 's/^v//;s/\([^-]*-g\)/r\1/;s/-/./g'
 }
 
 prepare() {
-    export VMODULES="$srcdir/.vmodules"
+    cd "${pkgname}"
 
-    cd "$pkgname/src" && v install
+    # Add the libvieter submodule
+    git submodule init
+    git config submodules.src/libvieter.url "${srcdir}/libvieter"
+    git -c protocol.file.allow=always submodule update
+
+    export VMODULES="${srcdir}/.vmodules"
+
+    cd src && v install
 }
 
 build() {
-    export VMODULES="$srcdir/.vmodules"
+    export VMODULES="${srcdir}/.vmodules"
 
-    cd "$pkgname"
+    cd "${pkgname}"
 
     make prod
 
@@ -42,9 +52,9 @@ build() {
 }
 
 package() {
-    install -dm755 "$pkgdir/usr/bin"
-    install -Dm755 "$pkgname/pvieter" "$pkgdir/usr/bin/vieter"
+    install -dm755 "${pkgdir}/usr/bin"
+    install -Dm755 "${pkgname}/pvieter" "${pkgdir}/usr/bin/vieter"
 
-    install -dm755 "$pkgdir/usr/share/man/man1"
-    install -Dm644 "$pkgname/man"/*.1 "$pkgdir/usr/share/man/man1"
+    install -dm755 "${pkgdir}/usr/share/man/man1"
+    install -Dm644 "${pkgname}/man"/*.1 "${pkgdir}/usr/share/man/man1"
 }

README.md

@@ -48,9 +48,9 @@ update`.
 
 ### Compiler
 
-I used to maintain a mirror that tracked the latest master, but nowadays, I
-maintain a Docker image containing the specific compiler version that Vieter
-builds with. Currently, this is V 0.3.2.
+V is developed using a specific compiler commit that is usually updated
+whenever a new version is released. Information on this can be found in the
+[tools](https://git.rustybever.be/vieter-v/tools) repository.
 
 ## Contributing
 

docs/api/source/includes/_targets.md

@@ -55,6 +55,8 @@ Parameter | Description
 limit | Maximum amount of results to return.
 offset | Offset of results.
 repo | Limit results to targets that publish to the given repo.
+query | Only return targets that have this substring in their URL, path or branch.
+arch | Only return targets that publish to this arch.
 
 ## Get specific target
 

src/agent/cli.v

@@ -23,9 +23,9 @@ pub fn cmd() cli.Command {
 		description: 'Start an agent daemon.'
 		execute: fn (cmd cli.Command) ! {
 			config_file := cmd.flags.get_string('config-file')!
-			conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+			conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
-			agent(conf)!
+			agent(conf_)!
 		}
 	}
 }

src/agent/daemon.v

@@ -20,11 +20,13 @@ struct AgentDaemon {
 	client client.Client
 mut:
 	images ImageManager
-	// Which builds are currently running; length is conf.max_concurrent_builds
-	builds []BuildConfig
 	// Atomic variables used to detect when a build has finished; length is
-	// conf.max_concurrent_builds
+	// conf.max_concurrent_builds. This approach is used as the difference
+	// between a recently finished build and an empty build slot is important
+	// for knowing whether the agent is currently "active".
 	atomics []u64
+	// Channel used to send builds to worker threads
+	build_channel chan BuildConfig
 }
 
 // agent_init initializes a new agent
@@ -34,8 +36,8 @@ fn agent_init(logger log.Log, conf Config) AgentDaemon {
 		client: client.new(conf.address, conf.api_key)
 		conf: conf
 		images: new_image_manager(conf.image_rebuild_frequency * 60)
-		builds: []BuildConfig{len: conf.max_concurrent_builds}
 		atomics: []u64{len: conf.max_concurrent_builds}
+		build_channel: chan BuildConfig{cap: conf.max_concurrent_builds}
 	}
 
 	return d
@@ -43,6 +45,11 @@ fn agent_init(logger log.Log, conf Config) AgentDaemon {
 
 // run starts the actual agent daemon. This function will run forever.
 pub fn (mut d AgentDaemon) run() {
+	// Spawn worker threads
+	for builder_index in 0 .. d.conf.max_concurrent_builds {
+		spawn d.builder_thread(d.build_channel, builder_index)
+	}
+
 	// This is just so that the very first time the loop is ran, the jobs are
 	// always polled
 	mut last_poll_time := time.now().add_seconds(-d.conf.polling_frequency)
@@ -51,7 +58,7 @@ pub fn (mut d AgentDaemon) run() {
 
 	for {
 		if sleep_time > 0 {
-			d.ldebug('Sleeping for $sleep_time')
+			d.ldebug('Sleeping for ${sleep_time}')
 			time.sleep(sleep_time)
 		}
 
@@ -80,14 +87,14 @@ pub fn (mut d AgentDaemon) run() {
 			d.ldebug('Polling for new jobs')
 
 			new_configs := d.client.poll_jobs(d.conf.arch, finished + empty) or {
-				d.lerror('Failed to poll jobs: $err.msg()')
+				d.lerror('Failed to poll jobs: ${err.msg()}')
 
 				// TODO pick a better delay here
 				sleep_time = 5 * time.second
 				continue
 			}
 
-			d.ldebug('Received $new_configs.len jobs')
+			d.ldebug('Received ${new_configs.len} jobs')
 
 			last_poll_time = time.now()
 
@@ -95,7 +102,7 @@ pub fn (mut d AgentDaemon) run() {
 				// Make sure a recent build base image is available for
 				// building the config
 				if !d.images.up_to_date(config.base_image) {
-					d.linfo('Building builder image from base image $config.base_image')
+					d.linfo('Building builder image from base image ${config.base_image}')
 
 					// TODO handle this better than to just skip the config
 					d.images.refresh_image(config.base_image) or {
@@ -107,10 +114,10 @@ pub fn (mut d AgentDaemon) run() {
 				// It's technically still possible that the build image is
 				// removed in the very short period between building the
 				// builder image and starting a build container with it. If
-				// this happens, faith really just didn't want you to do this
+				// this happens, fate really just didn't want you to do this
 				// build.
 
-				d.start_build(config)
+				d.build_channel <- config
 				running++
 			}
 		}
@@ -147,25 +154,9 @@ fn (mut d AgentDaemon) update_atomics() (int, int) {
 	return finished, empty
 }
 
-// start_build starts a build for the given BuildConfig.
-fn (mut d AgentDaemon) start_build(config BuildConfig) bool {
-	for i in 0 .. d.atomics.len {
-		if stdatomic.load_u64(&d.atomics[i]) == agent.build_empty {
-			stdatomic.store_u64(&d.atomics[i], agent.build_running)
-			d.builds[i] = config
-
-			go d.run_build(i, config)
-
-			return true
-		}
-	}
-
-	return false
-}
-
 // run_build actually starts the build process for a given target.
 fn (mut d AgentDaemon) run_build(build_index int, config BuildConfig) {
-	d.linfo('started build: $config')
+	d.linfo('started build: ${config}')
 
 	// 0 means success, 1 means failure
 	mut status := 0
@@ -176,22 +167,31 @@ fn (mut d AgentDaemon) run_build(build_index int, config BuildConfig) {
 	}
 
 	res := build.build_config(d.client.address, d.client.api_key, new_config) or {
-		d.ldebug('build_config error: $err.msg()')
+		d.ldebug('build_config error: ${err.msg()}')
 		status = 1
 
 		build.BuildResult{}
 	}
 
 	if status == 0 {
-		d.linfo('Uploading build logs for $config')
+		d.linfo('Uploading build logs for ${config}')
 
 		// TODO use the arch value here
 		build_arch := os.uname().machine
 		d.client.add_build_log(config.target_id, res.start_time, res.end_time, build_arch,
-			res.exit_code, res.logs) or { d.lerror('Failed to upload logs for $config') }
+			res.exit_code, res.logs) or { d.lerror('Failed to upload logs for ${config}') }
 	} else {
-		d.lwarn('an error occurred during build: $config')
+		d.lwarn('an error occurred during build: ${config}')
 	}
 
 	stdatomic.store_u64(&d.atomics[build_index], agent.build_done)
 }
+
+// builder_thread is a thread that constantly listens for builds to process
+fn (mut d AgentDaemon) builder_thread(ch chan BuildConfig, builder_index int) {
+	for {
+		build_config := <-ch or { break }
+
+		d.run_build(builder_index, build_config)
+	}
+}

src/agent/images.v

@@ -71,7 +71,7 @@ pub fn (mut m ImageManager) up_to_date(base_image string) bool {
 fn (mut m ImageManager) refresh_image(base_image string) ! {
 	// TODO use better image tags for built images
 	new_image := build.create_build_image(base_image) or {
-		return error('Failed to build builder image from base image $base_image')
+		return error('Failed to build builder image from base image ${base_image}')
 	}
 
 	m.images[base_image] << new_image
@@ -99,7 +99,7 @@ fn (mut m ImageManager) clean_old_images() {
 			// wasn't deleted. Therefore, we move the index over. If the function
 			// returns true, the array's length has decreased by one so we don't
 			// move the index.
-			dd.remove_image(m.images[image][i]) or {
+			dd.image_remove(m.images[image][i]) or {
 				// The image was removed by an external event
 				if err.code() == 404 {
 					m.images[image].delete(i)

src/agent/log.v

@@ -1,35 +1,36 @@
 module agent
 
-import log
-
-// log a message with the given level
-pub fn (mut d AgentDaemon) log(msg string, level log.Level) {
-	lock d.logger {
-		d.logger.send_output(msg, level)
-	}
-}
-
 // lfatal create a log message with the fatal level
 pub fn (mut d AgentDaemon) lfatal(msg string) {
-	d.log(msg, log.Level.fatal)
+	lock d.logger {
+		d.logger.fatal(msg)
+	}
 }
 
 // lerror create a log message with the error level
 pub fn (mut d AgentDaemon) lerror(msg string) {
-	d.log(msg, log.Level.error)
+	lock d.logger {
+		d.logger.error(msg)
+	}
 }
 
 // lwarn create a log message with the warn level
 pub fn (mut d AgentDaemon) lwarn(msg string) {
-	d.log(msg, log.Level.warn)
+	lock d.logger {
+		d.logger.warn(msg)
+	}
 }
 
 // linfo create a log message with the info level
 pub fn (mut d AgentDaemon) linfo(msg string) {
-	d.log(msg, log.Level.info)
+	lock d.logger {
+		d.logger.info(msg)
+	}
 }
 
 // ldebug create a log message with the debug level
 pub fn (mut d AgentDaemon) ldebug(msg string) {
-	d.log(msg, log.Level.debug)
+	lock d.logger {
+		d.logger.debug(msg)
+	}
 }

src/build/build.v

@@ -45,7 +45,7 @@ pub fn create_build_image(base_image string) !string {
 
 	c := docker.NewContainer{
 		image: base_image
-		env: ['BUILD_SCRIPT=$cmds_str']
+		env: ['BUILD_SCRIPT=${cmds_str}']
 		entrypoint: ['/bin/sh', '-c']
 		cmd: ['echo \$BUILD_SCRIPT | base64 -d | /bin/sh -e']
 	}
@@ -57,7 +57,7 @@ pub fn create_build_image(base_image string) !string {
 	image_tag := if image_parts.len > 1 { image_parts[1] } else { 'latest' }
 
 	// We pull the provided image
-	dd.pull_image(image_name, image_tag)!
+	dd.image_pull(image_name, image_tag)!
 
 	id := dd.container_create(c)!.id
 	// id := docker.create_container(c)!
@@ -79,7 +79,7 @@ pub fn create_build_image(base_image string) !string {
 	// TODO also add the base image's name into the image name to prevent
 	// conflicts.
 	tag := time.sys_mono_now().str()
-	image := dd.create_image_from_container(id, 'vieter-build', tag)!
+	image := dd.image_from_container(id, 'vieter-build', tag)!
 	dd.container_remove(id)!
 
 	return image.id
@@ -94,8 +94,8 @@ pub:
 }
 
 // build_target builds the given target. Internally it calls `build_config`.
-pub fn build_target(address string, api_key string, base_image_id string, target &Target, force bool) !BuildResult {
-	config := target.as_build_config(base_image_id, force)
+pub fn build_target(address string, api_key string, base_image_id string, target &Target, force bool, timeout int) !BuildResult {
+	config := target.as_build_config(base_image_id, force, timeout)
 
 	return build_config(address, api_key, config)
 }
@@ -118,10 +118,10 @@ pub fn build_config(address string, api_key string, config BuildConfig) !BuildRe
 	base64_script := base64.encode_str(build_script)
 
 	c := docker.NewContainer{
-		image: '$config.base_image'
+		image: '${config.base_image}'
 		env: [
-			'BUILD_SCRIPT=$base64_script',
-			'API_KEY=$api_key',
+			'BUILD_SCRIPT=${base64_script}',
+			'API_KEY=${api_key}',
 			// `archlinux:base-devel` does not correctly set the path variable,
 			// causing certain builds to fail. This fixes it.
 			'PATH=${build.path_dirs.join(':')}',
@@ -136,9 +136,17 @@ pub fn build_config(address string, api_key string, config BuildConfig) !BuildRe
 	dd.container_start(id)!
 
 	mut data := dd.container_inspect(id)!
+	start_time := time.now()
 
 	// This loop waits until the container has stopped, so we can remove it after
 	for data.state.running {
+		if time.now() - start_time > config.timeout * time.second {
+			dd.container_kill(id)!
+			dd.container_remove(id)!
+
+			return error('Build killed due to timeout (${config.timeout}s)')
+		}
+
 		time.sleep(1 * time.second)
 
 		data = dd.container_inspect(id)!

src/build/queue.v

@@ -1,7 +1,7 @@
 module build
 
 import models { BuildConfig, Target }
-import cron.expression { CronExpression, parse_expression }
+import cron
 import time
 import datatypes { MinHeap }
 import util
@@ -13,7 +13,7 @@ pub mut:
 	// Next timestamp from which point this job is allowed to be executed
 	timestamp time.Time
 	// Required for calculating next timestamp after having pop'ed a job
-	ce CronExpression
+	ce &cron.Expression = unsafe { nil }
 	// Actual build config sent to the agent
 	config BuildConfig
 	// Whether this is a one-time job
@@ -30,13 +30,15 @@ fn (r1 BuildJob) < (r2 BuildJob) bool {
 // for each architecture. Agents receive jobs from this queue.
 pub struct BuildJobQueue {
 	// Schedule to use for targets without explicitely defined cron expression
-	default_schedule CronExpression
+	default_schedule &cron.Expression
 	// Base image to use for targets without defined base image
 	default_base_image string
+	// After how many minutes a build should be forcefully cancelled
+	default_build_timeout int
 mut:
 	mutex shared util.Dummy
 	// For each architecture, a priority queue is tracked
-	queues map[string]MinHeap<BuildJob>
+	queues map[string]MinHeap[BuildJob]
 	// When a target is removed from the server or edited, its previous build
 	// configs will be invalid. This map allows for those to be simply skipped
 	// by ignoring any build configs created before this timestamp.
@@ -44,10 +46,11 @@ mut:
 }
 
 // new_job_queue initializes a new job queue
-pub fn new_job_queue(default_schedule CronExpression, default_base_image string) BuildJobQueue {
+pub fn new_job_queue(default_schedule &cron.Expression, default_base_image string, default_build_timeout int) BuildJobQueue {
 	return BuildJobQueue{
-		default_schedule: default_schedule
+		default_schedule: unsafe { default_schedule }
 		default_base_image: default_base_image
+		default_build_timeout: default_build_timeout
 		invalidated: map[int]time.Time{}
 	}
 }
@@ -74,25 +77,25 @@ pub struct InsertConfig {
 pub fn (mut q BuildJobQueue) insert(input InsertConfig) ! {
 	lock q.mutex {
 		if input.arch !in q.queues {
-			q.queues[input.arch] = MinHeap<BuildJob>{}
+			q.queues[input.arch] = MinHeap[BuildJob]{}
 		}
 
 		mut job := BuildJob{
 			created: time.now()
 			single: input.single
-			config: input.target.as_build_config(q.default_base_image, input.force)
+			config: input.target.as_build_config(q.default_base_image, input.force, q.default_build_timeout)
 		}
 
 		if !input.now {
 			ce := if input.target.schedule != '' {
-				parse_expression(input.target.schedule) or {
-					return error("Error while parsing cron expression '$input.target.schedule' (id $input.target.id): $err.msg()")
+				cron.parse_expression(input.target.schedule) or {
+					return error("Error while parsing cron expression '${input.target.schedule}' (id ${input.target.id}): ${err.msg()}")
 				}
 			} else {
 				q.default_schedule
 			}
 
-			job.timestamp = ce.next_from_now()!
+			job.timestamp = ce.next_from_now()
 			job.ce = ce
 		} else {
 			job.timestamp = time.now()
@@ -105,8 +108,8 @@ pub fn (mut q BuildJobQueue) insert(input InsertConfig) ! {
 // reschedule the given job by calculating the next timestamp and re-adding it
 // to its respective queue. This function is called by the pop functions
 // *after* having pop'ed the job.
-fn (mut q BuildJobQueue) reschedule(job BuildJob, arch string) ! {
-	new_timestamp := job.ce.next_from_now()!
+fn (mut q BuildJobQueue) reschedule(job BuildJob, arch string) {
+	new_timestamp := job.ce.next_from_now()
 
 	new_job := BuildJob{
 		...job
@@ -143,7 +146,7 @@ pub fn (mut q BuildJobQueue) peek(arch string) ?BuildJob {
 		}
 
 		q.pop_invalid(arch)
-		job := q.queues[arch].peek()?
+		job := q.queues[arch].peek() or { return none }
 
 		if job.timestamp < time.now() {
 			return job
@@ -162,16 +165,13 @@ pub fn (mut q BuildJobQueue) pop(arch string) ?BuildJob {
 		}
 
 		q.pop_invalid(arch)
-		mut job := q.queues[arch].peek()?
+		mut job := q.queues[arch].peek() or { return none }
 
 		if job.timestamp < time.now() {
-			job = q.queues[arch].pop()?
+			job = q.queues[arch].pop() or { return none }
 
 			if !job.single {
-				// TODO how do we handle this properly? Is it even possible for a
-				// cron expression to not return a next time if it's already been
-				// used before?
-				q.reschedule(job, arch) or {}
+				q.reschedule(job, arch)
 			}
 
 			return job
@@ -198,8 +198,7 @@ pub fn (mut q BuildJobQueue) pop_n(arch string, n int) []BuildJob {
 				job = q.queues[arch].pop() or { break }
 
 				if !job.single {
-					// TODO idem
-					q.reschedule(job, arch) or {}
+					q.reschedule(job, arch)
 				}
 
 				out << job

src/build/shell.v

@@ -24,12 +24,12 @@ pub fn echo_commands(cmds []string) []string {
 
 // create_build_script generates a shell script that builds a given Target.
 fn create_build_script(address string, config BuildConfig, build_arch string) string {
-	repo_url := '$address/$config.repo'
+	repo_url := '${address}/${config.repo}'
 
 	mut commands := [
 		// This will later be replaced by a proper setting for changing the
 		// mirrorlist
-		"echo -e '[$config.repo]\\nServer = $address/\$repo/\$arch\\nSigLevel = Optional' >> /etc/pacman.conf"
+		"echo -e '[${config.repo}]\\nServer = ${address}/\$repo/\$arch\\nSigLevel = Optional' >> /etc/pacman.conf"
 		// We need to update the package list of the repo we just added above.
 		// This should however not pull in a lot of packages as long as the
 		// builder image is rebuilt frequently.
@@ -42,18 +42,18 @@ fn create_build_script(address string, config BuildConfig, build_arch string) st
 		'git' {
 			if config.branch == '' {
 				[
-					"git clone --single-branch --depth 1 '$config.url' repo",
+					"git clone --single-branch --depth 1 '${config.url}' repo",
 				]
 			} else {
 				[
-					"git clone --single-branch --depth 1 --branch $config.branch '$config.url' repo",
+					"git clone --single-branch --depth 1 --branch ${config.branch} '${config.url}' repo",
 				]
 			}
 		}
 		'url' {
 			[
 				'mkdir repo',
-				"curl -o repo/PKGBUILD -L '$config.url'",
+				"curl -o repo/PKGBUILD -L '${config.url}'",
 			]
 		}
 		else {
@@ -62,7 +62,7 @@ fn create_build_script(address string, config BuildConfig, build_arch string) st
 	}
 
 	commands << if config.path != '' {
-		"cd 'repo/$config.path'"
+		"cd 'repo/${config.path}'"
 	} else {
 		'cd repo'
 	}
@@ -76,7 +76,7 @@ fn create_build_script(address string, config BuildConfig, build_arch string) st
 		// The build container checks whether the package is already present on
 		// the server.
 		commands << [
-			'curl -s --head --fail $repo_url/$build_arch/\$pkgname-\$pkgver-\$pkgrel && exit 0',
+			'curl -s --head --fail ${repo_url}/${build_arch}/\$pkgname-\$pkgver-\$pkgrel && exit 0',
 			// If the above curl command succeeds, we don't need to rebuild the
 			// package. However, because we're in a su shell, the exit command will
 			// drop us back into the root shell. Therefore, we must check whether
@@ -86,7 +86,7 @@ fn create_build_script(address string, config BuildConfig, build_arch string) st
 	}
 
 	commands << [
-		'MAKEFLAGS="-j\$(nproc)" makepkg -s --noconfirm --needed --noextract && for pkg in \$(ls -1 *.pkg*); do curl -XPOST -T "\$pkg" -H "X-API-KEY: \$API_KEY" $repo_url/publish; done',
+		'MAKEFLAGS="-j\$(nproc)" makepkg -s --noconfirm --needed --noextract && for pkg in \$(ls -1 *.pkg*); do curl -XPOST -T "\$pkg" -H "X-API-KEY: \$API_KEY" ${repo_url}/publish; done',
 	]
 
 	return echo_commands(commands).join('\n')

src/client/client.v

@@ -22,7 +22,7 @@ pub fn new(address string, api_key string) Client {
 // send_request_raw sends an HTTP request, returning the http.Response object.
 // It encodes the params so that they're safe to pass as HTTP query parameters.
 fn (c &Client) send_request_raw(method Method, url string, params map[string]string, body string) !http.Response {
-	mut full_url := '$c.address$url'
+	mut full_url := '${c.address}${url}'
 
 	if params.len > 0 {
 		mut params_escaped := map[string]string{}
@@ -33,9 +33,9 @@ fn (c &Client) send_request_raw(method Method, url string, params map[string]str
 			params_escaped[k] = urllib.query_escape(v)
 		}
 
-		params_str := params_escaped.keys().map('$it=${params_escaped[it]}').join('&')
+		params_str := params_escaped.keys().map('${it}=${params_escaped[it]}').join('&')
 
-		full_url = '$full_url?$params_str'
+		full_url = '${full_url}?${params_str}'
 	}
 
 	// Looking at the source code, this function doesn't actually fail, so I'm
@@ -49,13 +49,13 @@ fn (c &Client) send_request_raw(method Method, url string, params map[string]str
 }
 
 // send_request<T> just calls send_request_with_body<T> with an empty body.
-fn (c &Client) send_request<T>(method Method, url string, params map[string]string) !Response<T> {
-	return c.send_request_with_body<T>(method, url, params, '')
+fn (c &Client) send_request[T](method Method, url string, params map[string]string) !Response[T] {
+	return c.send_request_with_body[T](method, url, params, '')
 }
 
 // send_request_with_body<T> calls send_request_raw_response & parses its
 // output as a Response<T> object.
-fn (c &Client) send_request_with_body<T>(method Method, url string, params map[string]string, body string) !Response<T> {
+fn (c &Client) send_request_with_body[T](method Method, url string, params map[string]string, body string) !Response[T] {
 	res := c.send_request_raw(method, url, params, body)!
 	status := res.status()
 
@@ -64,12 +64,12 @@ fn (c &Client) send_request_with_body<T>(method Method, url string, params map[s
 	if status.is_error() {
 		// A non-successful status call will have an empty body
 		if res.body == '' {
-			return error('Error $res.status_code ($status.str()): (empty response)')
+			return error('Error ${res.status_code} (${status.str()}): (empty response)')
 		}
 
-		data := json.decode(Response<string>, res.body)!
+		data := json.decode(Response[string], res.body)!
 
-		return error('Status $res.status_code ($status.str()): $data.message')
+		return error('Status ${res.status_code} (${status.str()}): ${data.message}')
 	}
 
 	// Just return an empty successful response
@@ -77,7 +77,7 @@ fn (c &Client) send_request_with_body<T>(method Method, url string, params map[s
 		return new_data_response(T{})
 	}
 
-	data := json.decode(Response<T>, res.body)!
+	data := json.decode(Response[T], res.body)!
 
 	return data
 }

src/client/jobs.v

@@ -4,7 +4,7 @@ import models { BuildConfig }
 
 // poll_jobs requests a list of new build jobs from the server.
 pub fn (c &Client) poll_jobs(arch string, max int) ![]BuildConfig {
-	data := c.send_request<[]BuildConfig>(.get, '/api/v1/jobs/poll', {
+	data := c.send_request[[]BuildConfig](.get, '/api/v1/jobs/poll', {
 		'arch': arch
 		'max':  max.str()
 	})!
@@ -15,7 +15,7 @@ pub fn (c &Client) poll_jobs(arch string, max int) ![]BuildConfig {
 // queue_job adds a new one-time build job for the given target to the job
 // queue.
 pub fn (c &Client) queue_job(target_id int, arch string, force bool) ! {
-	c.send_request<string>(.post, '/api/v1/jobs/queue', {
+	c.send_request[string](.post, '/api/v1/jobs/queue', {
 		'target': target_id.str()
 		'arch':   arch
 		'force':  force.str()

src/client/logs.v

@@ -7,27 +7,27 @@ import time
 // get_build_logs returns all build logs.
 pub fn (c &Client) get_build_logs(filter BuildLogFilter) ![]BuildLog {
 	params := models.params_from(filter)
-	data := c.send_request<[]BuildLog>(.get, '/api/v1/logs', params)!
+	data := c.send_request[[]BuildLog](.get, '/api/v1/logs', params)!
 
 	return data.data
 }
 
 // get_build_log returns a specific build log.
 pub fn (c &Client) get_build_log(id int) !BuildLog {
-	data := c.send_request<BuildLog>(.get, '/api/v1/logs/$id', {})!
+	data := c.send_request[BuildLog](.get, '/api/v1/logs/${id}', {})!
 
 	return data.data
 }
 
 // get_build_log_content returns the contents of the build log file.
 pub fn (c &Client) get_build_log_content(id int) !string {
-	data := c.send_request_raw_response(.get, '/api/v1/logs/$id/content', {}, '')!
+	data := c.send_request_raw_response(.get, '/api/v1/logs/${id}/content', {}, '')!
 
 	return data
 }
 
 // add_build_log adds a new build log to the server.
-pub fn (c &Client) add_build_log(target_id int, start_time time.Time, end_time time.Time, arch string, exit_code int, content string) !Response<int> {
+pub fn (c &Client) add_build_log(target_id int, start_time time.Time, end_time time.Time, arch string, exit_code int, content string) !Response[int] {
 	params := {
 		'target':    target_id.str()
 		'startTime': start_time.unix_time().str()
@@ -36,12 +36,12 @@ pub fn (c &Client) add_build_log(target_id int, start_time time.Time, end_time t
 		'exitCode':  exit_code.str()
 	}
 
-	data := c.send_request_with_body<int>(.post, '/api/v1/logs', params, content)!
+	data := c.send_request_with_body[int](.post, '/api/v1/logs', params, content)!
 
 	return data
 }
 
 // remove_build_log removes the build log with the given id from the server.
 pub fn (c &Client) remove_build_log(id int) ! {
-	c.send_request<string>(.delete, '/api/v1/logs/$id', {})!
+	c.send_request[string](.delete, '/api/v1/logs/${id}', {})!
 }

src/client/repos.v

@@ -2,15 +2,15 @@ module client
 
 // remove_repo removes an entire repository.
 pub fn (c &Client) remove_repo(repo string) ! {
-	c.send_request<string>(.delete, '/$repo', {})!
+	c.send_request[string](.delete, '/${repo}', {})!
 }
 
 // remove_arch_repo removes an entire arch-repo.
 pub fn (c &Client) remove_arch_repo(repo string, arch string) ! {
-	c.send_request<string>(.delete, '/$repo/$arch', {})!
+	c.send_request[string](.delete, '/${repo}/${arch}', {})!
 }
 
 // remove_package removes a single package from the given arch-repo.
 pub fn (c &Client) remove_package(repo string, arch string, pkgname string) ! {
-	c.send_request<string>(.delete, '/$repo/$arch/$pkgname', {})!
+	c.send_request[string](.delete, '/${repo}/${arch}/${pkgname}', {})!
 }

src/client/targets.v

@@ -5,7 +5,7 @@ import models { Target, TargetFilter }
 // get_targets returns a list of targets, given a filter object.
 pub fn (c &Client) get_targets(filter TargetFilter) ![]Target {
 	params := models.params_from(filter)
-	data := c.send_request<[]Target>(.get, '/api/v1/targets', params)!
+	data := c.send_request[[]Target](.get, '/api/v1/targets', params)!
 
 	return data.data
 }
@@ -33,7 +33,7 @@ pub fn (c &Client) get_all_targets() ![]Target {
 
 // get_target returns the target for a specific id.
 pub fn (c &Client) get_target(id int) !Target {
-	data := c.send_request<Target>(.get, '/api/v1/targets/$id', {})!
+	data := c.send_request[Target](.get, '/api/v1/targets/${id}', {})!
 
 	return data.data
 }
@@ -49,15 +49,15 @@ pub struct NewTarget {
 
 // add_target adds a new target to the server.
 pub fn (c &Client) add_target(t NewTarget) !int {
-	params := models.params_from<NewTarget>(t)
-	data := c.send_request<int>(.post, '/api/v1/targets', params)!
+	params := models.params_from[NewTarget](t)
+	data := c.send_request[int](.post, '/api/v1/targets', params)!
 
 	return data.data
 }
 
 // remove_target removes the target with the given id from the server.
 pub fn (c &Client) remove_target(id int) !string {
-	data := c.send_request<string>(.delete, '/api/v1/targets/$id', {})!
+	data := c.send_request[string](.delete, '/api/v1/targets/${id}', {})!
 
 	return data.data
 }
@@ -65,7 +65,7 @@ pub fn (c &Client) remove_target(id int) !string {
 // patch_target sends a PATCH request to the given target with the params as
 // payload.
 pub fn (c &Client) patch_target(id int, params map[string]string) !string {
-	data := c.send_request<string>(.patch, '/api/v1/targets/$id', params)!
+	data := c.send_request[string](.patch, '/api/v1/targets/${id}', params)!
 
 	return data.data
 }

src/console/aur/aur.v

@@ -36,24 +36,24 @@ pub fn cmd() cli.Command {
 				required_args: 2
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					c := aur.new()
 					pkgs := c.info(cmd.args[1..])!
 
-					vc := client.new(conf.address, conf.api_key)
+					vc := client.new(conf_.address, conf_.api_key)
 
 					for pkg in pkgs {
 						vc.add_target(
 							kind: 'git'
-							url: 'https://aur.archlinux.org/$pkg.package_base' + '.git'
+							url: 'https://aur.archlinux.org/${pkg.package_base}' + '.git'
 							repo: cmd.args[0]
 						) or {
-							println('Failed to add $pkg.name: $err.msg()')
+							println('Failed to add ${pkg.name}: ${err.msg()}')
 							continue
 						}
 
-						println('Added $pkg.name' + '.')
+						println('Added ${pkg.name}' + '.')
 					}
 				}
 			},

src/console/logs/logs.v

@@ -74,7 +74,7 @@ pub fn cmd() cli.Command {
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					mut filter := BuildLogFilter{}
 
@@ -146,7 +146,7 @@ pub fn cmd() cli.Command {
 
 					raw := cmd.flags.get_bool('raw')!
 
-					list(conf, filter, raw)!
+					list(conf_, filter, raw)!
 				}
 			},
 			cli.Command{
@@ -156,9 +156,9 @@ pub fn cmd() cli.Command {
 				description: 'Remove a build log that matches the given id.'
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
-					remove(conf, cmd.args[0])!
+					remove(conf_, cmd.args[0])!
 				}
 			},
 			cli.Command{
@@ -168,10 +168,10 @@ pub fn cmd() cli.Command {
 				description: 'Show all info for a specific build log.'
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					id := cmd.args[0].int()
-					info(conf, id)!
+					info(conf_, id)!
 				}
 			},
 			cli.Command{
@@ -181,10 +181,10 @@ pub fn cmd() cli.Command {
 				description: 'Output the content of a build log to stdout.'
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					id := cmd.args[0].int()
-					content(conf, id)!
+					content(conf_, id)!
 				}
 			},
 		]
@@ -204,16 +204,16 @@ fn print_log_list(logs []BuildLog, raw bool) ! {
 }
 
 // list prints a list of all build logs.
-fn list(conf Config, filter BuildLogFilter, raw bool) ! {
-	c := client.new(conf.address, conf.api_key)
+fn list(conf_ Config, filter BuildLogFilter, raw bool) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	logs := c.get_build_logs(filter)!
 
 	print_log_list(logs, raw)!
 }
 
 // info print the detailed info for a given build log.
-fn info(conf Config, id int) ! {
-	c := client.new(conf.address, conf.api_key)
+fn info(conf_ Config, id int) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	log := c.get_build_log(id)!
 
 	print(log)
@@ -221,15 +221,15 @@ fn info(conf Config, id int) ! {
 
 // content outputs the contents of the log file for a given build log to
 // stdout.
-fn content(conf Config, id int) ! {
-	c := client.new(conf.address, conf.api_key)
+fn content(conf_ Config, id int) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	content := c.get_build_log_content(id)!
 
 	println(content)
 }
 
 // remove removes a build log from the server's list.
-fn remove(conf Config, id string) ! {
-	c := client.new(conf.address, conf.api_key)
+fn remove(conf_ Config, id string) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	c.remove_build_log(id.int())!
 }

src/console/repos/repos.v

@@ -28,7 +28,7 @@ pub fn cmd() cli.Command {
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					if cmd.args.len < 3 {
 						if !cmd.flags.get_bool('force')! {
@@ -36,14 +36,14 @@ pub fn cmd() cli.Command {
 						}
 					}
 
-					client := client.new(conf.address, conf.api_key)
+					client_ := client.new(conf_.address, conf_.api_key)
 
 					if cmd.args.len == 1 {
-						client.remove_repo(cmd.args[0])!
+						client_.remove_repo(cmd.args[0])!
 					} else if cmd.args.len == 2 {
-						client.remove_arch_repo(cmd.args[0], cmd.args[1])!
+						client_.remove_arch_repo(cmd.args[0], cmd.args[1])!
 					} else {
-						client.remove_package(cmd.args[0], cmd.args[1], cmd.args[2])!
+						client_.remove_package(cmd.args[0], cmd.args[1], cmd.args[2])!
 					}
 				}
 			},

src/console/schedule/schedule.v

@@ -1,7 +1,7 @@
 module schedule
 
 import cli
-import cron.expression { parse_expression }
+import cron
 import time
 
 // cmd returns the cli submodule for previewing a cron schedule.
@@ -19,10 +19,10 @@ pub fn cmd() cli.Command {
 			},
 		]
 		execute: fn (cmd cli.Command) ! {
-			ce := parse_expression(cmd.args.join(' '))!
+			ce := cron.parse_expression(cmd.args.join(' '))!
 			count := cmd.flags.get_int('count')!
 
-			for t in ce.next_n(time.now(), count)! {
+			for t in ce.next_n(time.now(), count) {
 				println(t)
 			}
 		}

src/console/targets/build.v

@@ -6,7 +6,7 @@ import os
 import build
 
 // build locally builds the target with the given id.
-fn build(conf Config, target_id int, force bool) ! {
+fn build_target(conf Config, target_id int, force bool, timeout int) ! {
 	c := client.new(conf.address, conf.api_key)
 	target := c.get_target(target_id)!
 
@@ -16,7 +16,7 @@ fn build(conf Config, target_id int, force bool) ! {
 	image_id := build.create_build_image(conf.base_image)!
 
 	println('Running build...')
-	res := build.build_target(conf.address, conf.api_key, image_id, target, force)!
+	res := build.build_target(conf.address, conf.api_key, image_id, target, force, timeout)!
 
 	println('Removing build image...')
 
@@ -26,7 +26,7 @@ fn build(conf Config, target_id int, force bool) ! {
 		dd.close() or {}
 	}
 
-	dd.remove_image(image_id)!
+	dd.image_remove(image_id)!
 
 	println('Uploading logs to Vieter...')
 	c.add_build_log(target.id, res.start_time, res.end_time, build_arch, res.exit_code,

src/console/targets/targets.v

@@ -2,7 +2,7 @@ module targets
 
 import cli
 import conf as vconf
-import cron.expression { parse_expression }
+import cron
 import client { NewTarget }
 import console
 import models { TargetFilter }
@@ -40,10 +40,21 @@ pub fn cmd() cli.Command {
 						description: 'Only return targets that publish to this repo.'
 						flag: cli.FlagType.string
 					},
+					cli.Flag{
+						name: 'query'
+						abbrev: 'q'
+						description: 'Search string to filter targets by.'
+						flag: cli.FlagType.string
+					},
+					cli.Flag{
+						name: 'arch'
+						description: 'Only list targets that build for this arch.'
+						flag: cli.FlagType.string
+					},
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					mut filter := TargetFilter{}
 
@@ -62,9 +73,19 @@ pub fn cmd() cli.Command {
 						filter.repo = repo
 					}
 
+					query := cmd.flags.get_string('query')!
+					if query != '' {
+						filter.query = query
+					}
+
+					arch := cmd.flags.get_string('arch')!
+					if arch != '' {
+						filter.arch = arch
+					}
+
 					raw := cmd.flags.get_bool('raw')!
 
-					list(conf, filter, raw)!
+					list(conf_, filter, raw)!
 				}
 			},
 			cli.Command{
@@ -92,7 +113,7 @@ pub fn cmd() cli.Command {
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					t := NewTarget{
 						kind: cmd.flags.get_string('kind')!
@@ -104,7 +125,7 @@ pub fn cmd() cli.Command {
 
 					raw := cmd.flags.get_bool('raw')!
 
-					add(conf, t, raw)!
+					add(conf_, t, raw)!
 				}
 			},
 			cli.Command{
@@ -114,9 +135,9 @@ pub fn cmd() cli.Command {
 				description: 'Remove a target that matches the given id.'
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
-					remove(conf, cmd.args[0])!
+					remove(conf_, cmd.args[0])!
 				}
 			},
 			cli.Command{
@@ -126,9 +147,9 @@ pub fn cmd() cli.Command {
 				description: 'Show detailed information for the target matching the id.'
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
-					info(conf, cmd.args[0])!
+					info(conf_, cmd.args[0])!
 				}
 			},
 			cli.Command{
@@ -175,7 +196,7 @@ pub fn cmd() cli.Command {
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					found := cmd.flags.get_all_found()
 
@@ -187,7 +208,7 @@ pub fn cmd() cli.Command {
 						}
 					}
 
-					patch(conf, cmd.args[0], params)!
+					patch(conf_, cmd.args[0], params)!
 				}
 			},
 			cli.Command{
@@ -211,13 +232,20 @@ pub fn cmd() cli.Command {
 						description: 'Architecture to schedule build for. Required when using -remote.'
 						flag: cli.FlagType.string
 					},
+					cli.Flag{
+						name: 'timeout'
+						description: 'After how many minutes to cancel the build. Only applies to local builds.'
+						flag: cli.FlagType.int
+						default_value: ['3600']
+					},
 				]
 				execute: fn (cmd cli.Command) ! {
 					config_file := cmd.flags.get_string('config-file')!
-					conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+					conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
 					remote := cmd.flags.get_bool('remote')!
 					force := cmd.flags.get_bool('force')!
+					timeout := cmd.flags.get_int('timeout')!
 					target_id := cmd.args[0].int()
 
 					if remote {
@@ -227,10 +255,10 @@ pub fn cmd() cli.Command {
 							return error('When scheduling the build remotely, you have to specify an architecture.')
 						}
 
-						c := client.new(conf.address, conf.api_key)
+						c := client.new(conf_.address, conf_.api_key)
 						c.queue_job(target_id, arch, force)!
 					} else {
-						build(conf, target_id, force)!
+						build_target(conf_, target_id, force, timeout)!
 					}
 				}
 			},
@@ -239,8 +267,8 @@ pub fn cmd() cli.Command {
 }
 
 // list prints out a list of all repositories.
-fn list(conf Config, filter TargetFilter, raw bool) ! {
-	c := client.new(conf.address, conf.api_key)
+fn list(conf_ Config, filter TargetFilter, raw bool) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	targets := c.get_targets(filter)!
 	data := targets.map([it.id.str(), it.kind, it.url, it.repo])
 
@@ -252,40 +280,40 @@ fn list(conf Config, filter TargetFilter, raw bool) ! {
 }
 
 // add adds a new target to the server's list.
-fn add(conf Config, t &NewTarget, raw bool) ! {
-	c := client.new(conf.address, conf.api_key)
+fn add(conf_ Config, t &NewTarget, raw bool) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	target_id := c.add_target(t)!
 
 	if raw {
 		println(target_id)
 	} else {
-		println('Target added with id $target_id')
+		println('Target added with id ${target_id}')
 	}
 }
 
 // remove removes a target from the server's list.
-fn remove(conf Config, id string) ! {
-	c := client.new(conf.address, conf.api_key)
+fn remove(conf_ Config, id string) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	c.remove_target(id.int())!
 }
 
 // patch patches a given target with the provided params.
-fn patch(conf Config, id string, params map[string]string) ! {
+fn patch(conf_ Config, id string, params map[string]string) ! {
 	// We check the cron expression first because it's useless to send an
 	// invalid one to the server.
 	if 'schedule' in params && params['schedule'] != '' {
-		parse_expression(params['schedule']) or {
-			return error('Invalid cron expression: $err.msg()')
+		cron.parse_expression(params['schedule']) or {
+			return error('Invalid cron expression: ${err.msg()}')
 		}
 	}
 
-	c := client.new(conf.address, conf.api_key)
+	c := client.new(conf_.address, conf_.api_key)
 	c.patch_target(id.int(), params)!
 }
 
 // info shows detailed information for a given target.
-fn info(conf Config, id string) ! {
-	c := client.new(conf.address, conf.api_key)
+fn info(conf_ Config, id string) ! {
+	c := client.new(conf_.address, conf_.api_key)
 	target := c.get_target(id.int())!
 	println(target)
 }

src/cron/cli.v

@@ -1,32 +0,0 @@
-module cron
-
-import cli
-import conf as vconf
-
-struct Config {
-pub:
-	log_level               string = 'WARN'
-	api_key                 string
-	address                 string
-	data_dir                string
-	base_image              string = 'archlinux:base-devel'
-	max_concurrent_builds   int    = 1
-	api_update_frequency    int    = 15
-	image_rebuild_frequency int    = 1440
-	// Replicates the behavior of the original cron system
-	global_schedule string = '0 3'
-}
-
-// cmd returns the cli module that handles the cron daemon.
-pub fn cmd() cli.Command {
-	return cli.Command{
-		name: 'cron'
-		description: 'Start the cron service that periodically runs builds.'
-		execute: fn (cmd cli.Command) ! {
-			config_file := cmd.flags.get_string('config-file')!
-			conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
-
-			cron(conf)!
-		}
-	}
-}

src/cron/cron.v

@@ -1,33 +0,0 @@
-module cron
-
-import log
-import cron.daemon
-import cron.expression
-import os
-
-const log_file_name = 'vieter.cron.log'
-
-// cron starts a cron daemon & starts periodically scheduling builds.
-pub fn cron(conf Config) ! {
-	// Configure logger
-	log_level := log.level_from_tag(conf.log_level) or {
-		return error('Invalid log level. The allowed values are FATAL, ERROR, WARN, INFO & DEBUG.')
-	}
-
-	mut logger := log.Log{
-		level: log_level
-	}
-
-	log_file := os.join_path_single(conf.data_dir, cron.log_file_name)
-	logger.set_full_logpath(log_file)
-	logger.log_to_console_too()
-
-	ce := expression.parse_expression(conf.global_schedule) or {
-		return error('Error while parsing global cron expression: $err.msg()')
-	}
-
-	mut d := daemon.init_daemon(logger, conf.address, conf.api_key, conf.base_image, ce,
-		conf.max_concurrent_builds, conf.api_update_frequency, conf.image_rebuild_frequency)!
-
-	d.run()
-}

src/cron/daemon/build.v

@@ -1,115 +0,0 @@
-module daemon
-
-import time
-import sync.stdatomic
-import build
-import os
-
-const (
-	build_empty   = 0
-	build_running = 1
-	build_done    = 2
-)
-
-// clean_finished_builds removes finished builds from the build slots & returns
-// them.
-fn (mut d Daemon) clean_finished_builds() []ScheduledBuild {
-	mut out := []ScheduledBuild{}
-
-	for i in 0 .. d.atomics.len {
-		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_done {
-			stdatomic.store_u64(&d.atomics[i], daemon.build_empty)
-			out << d.builds[i]
-		}
-	}
-
-	return out
-}
-
-// update_builds starts as many builds as possible.
-fn (mut d Daemon) start_new_builds() {
-	now := time.now()
-
-	for d.queue.len() > 0 {
-		elem := d.queue.peek() or {
-			d.lerror("queue.peek() unexpectedly returned an error. This shouldn't happen.")
-
-			break
-		}
-
-		if elem.timestamp < now {
-			sb := d.queue.pop() or {
-				d.lerror("queue.pop() unexpectedly returned an error. This shouldn't happen.")
-
-				break
-			}
-
-			// If this build couldn't be scheduled, no more will be possible.
-			if !d.start_build(sb) {
-				d.queue.insert(sb)
-				break
-			}
-		} else {
-			break
-		}
-	}
-}
-
-// start_build starts a build for the given ScheduledBuild object.
-fn (mut d Daemon) start_build(sb ScheduledBuild) bool {
-	for i in 0 .. d.atomics.len {
-		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_empty {
-			stdatomic.store_u64(&d.atomics[i], daemon.build_running)
-			d.builds[i] = sb
-
-			go d.run_build(i, sb)
-
-			return true
-		}
-	}
-
-	return false
-}
-
-// run_build actually starts the build process for a given target.
-fn (mut d Daemon) run_build(build_index int, sb ScheduledBuild) {
-	d.linfo('started build: $sb.target.url -> $sb.target.repo')
-
-	// 0 means success, 1 means failure
-	mut status := 0
-
-	res := build.build_target(d.client.address, d.client.api_key, d.builder_images.last(),
-		&sb.target, false) or {
-		d.ldebug('build_target error: $err.msg()')
-		status = 1
-
-		build.BuildResult{}
-	}
-
-	if status == 0 {
-		d.linfo('finished build: $sb.target.url -> $sb.target.repo; uploading logs...')
-
-		build_arch := os.uname().machine
-		d.client.add_build_log(sb.target.id, res.start_time, res.end_time, build_arch,
-			res.exit_code, res.logs) or {
-			d.lerror('Failed to upload logs for build: $sb.target.url -> $sb.target.repo')
-		}
-	} else {
-		d.linfo('an error occured during build: $sb.target.url -> $sb.target.repo')
-	}
-
-	stdatomic.store_u64(&d.atomics[build_index], daemon.build_done)
-}
-
-// current_build_count returns how many builds are currently running.
-fn (mut d Daemon) current_build_count() int {
-	mut res := 0
-
-	for i in 0 .. d.atomics.len {
-		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_running {
-			res += 1
-		}
-	}
-
-	return res
-}

src/cron/daemon/daemon.v

@@ -1,274 +0,0 @@
-module daemon
-
-import time
-import log
-import datatypes { MinHeap }
-import cron.expression { CronExpression, parse_expression }
-import math
-import build
-import docker
-import os
-import client
-import models { Target }
-
-const (
-	// How many seconds to wait before retrying to update API if failed
-	api_update_retry_timeout        = 5
-	// How many seconds to wait before retrying to rebuild image if failed
-	rebuild_base_image_retry_timout = 30
-)
-
-struct ScheduledBuild {
-pub:
-	target    Target
-	timestamp time.Time
-}
-
-// Overloaded operator for comparing ScheduledBuild objects
-fn (r1 ScheduledBuild) < (r2 ScheduledBuild) bool {
-	return r1.timestamp < r2.timestamp
-}
-
-pub struct Daemon {
-mut:
-	client                  client.Client
-	base_image              string
-	builder_images          []string
-	global_schedule         CronExpression
-	api_update_frequency    int
-	image_rebuild_frequency int
-	// Targets currently loaded from API.
-	targets []Target
-	// At what point to update the list of targets.
-	api_update_timestamp  time.Time
-	image_build_timestamp time.Time
-	queue                 MinHeap<ScheduledBuild>
-	// Which builds are currently running
-	builds []ScheduledBuild
-	// Atomic variables used to detect when a build has finished; length is the
-	// same as builds
-	atomics []u64
-	logger  shared log.Log
-}
-
-// init_daemon initializes a new Daemon object. It renews the targets &
-// populates the build queue for the first time.
-pub fn init_daemon(logger log.Log, address string, api_key string, base_image string, global_schedule CronExpression, max_concurrent_builds int, api_update_frequency int, image_rebuild_frequency int) !Daemon {
-	mut d := Daemon{
-		client: client.new(address, api_key)
-		base_image: base_image
-		global_schedule: global_schedule
-		api_update_frequency: api_update_frequency
-		image_rebuild_frequency: image_rebuild_frequency
-		atomics: []u64{len: max_concurrent_builds}
-		builds: []ScheduledBuild{len: max_concurrent_builds}
-		logger: logger
-	}
-
-	// Initialize the targets & queue
-	d.renew_targets()
-	d.renew_queue()
-	if !d.rebuild_base_image() {
-		return error('The base image failed to build. The Vieter cron daemon cannot run without an initial builder image.')
-	}
-
-	return d
-}
-
-// run starts the actual daemon process. It runs builds when possible &
-// periodically refreshes the list of targets to ensure we stay in sync.
-pub fn (mut d Daemon) run() {
-	for {
-		finished_builds := d.clean_finished_builds()
-
-		// Update the API's contents if needed & renew the queue
-		if time.now() >= d.api_update_timestamp {
-			d.renew_targets()
-			d.renew_queue()
-		}
-		// The finished builds should only be rescheduled if the API contents
-		// haven't been renewed.
-		else {
-			for sb in finished_builds {
-				d.schedule_build(sb.target)
-			}
-		}
-
-		// TODO remove old builder images.
-		// This issue is less trivial than it sounds, because a build could
-		// still be running when the image has to be rebuilt. That would
-		// prevent the image from being removed. Therefore, we will need to
-		// keep track of a list or something & remove an image once we have
-		// made sure it isn't being used anymore.
-		if time.now() >= d.image_build_timestamp {
-			d.rebuild_base_image()
-			// In theory, executing this function here allows an old builder
-			// image to exist for at most image_rebuild_frequency minutes.
-			d.clean_old_base_images()
-		}
-
-		// Schedules new builds when possible
-		d.start_new_builds()
-
-		// If there are builds currently running, the daemon should refresh
-		// every second to clean up any finished builds & start new ones.
-		mut delay := time.Duration(1 * time.second)
-
-		// Sleep either until we have to refresh the targets or when the next
-		// build has to start, with a minimum of 1 second.
-		if d.current_build_count() == 0 {
-			now := time.now()
-			delay = d.api_update_timestamp - now
-
-			if d.queue.len() > 0 {
-				elem := d.queue.peek() or {
-					d.lerror("queue.peek() unexpectedly returned an error. This shouldn't happen.")
-
-					// This is just a fallback option. In theory, queue.peek()
-					// should *never* return an error or none, because we check
-					// its len beforehand.
-					time.sleep(1)
-					continue
-				}
-
-				time_until_next_job := elem.timestamp - now
-
-				delay = math.min(delay, time_until_next_job)
-			}
-		}
-
-		// We sleep for at least one second. This is to prevent the program
-		// from looping agressively when a cronjob can be scheduled, but
-		// there's no spots free for it to be started.
-		delay = math.max(delay, 1 * time.second)
-
-		d.ldebug('Sleeping for ${delay}...')
-
-		time.sleep(delay)
-	}
-}
-
-// schedule_build adds the next occurence of the given targets build to the
-// queue.
-fn (mut d Daemon) schedule_build(target Target) {
-	ce := if target.schedule != '' {
-		parse_expression(target.schedule) or {
-			// TODO This shouldn't return an error if the expression is empty.
-			d.lerror("Error while parsing cron expression '$target.schedule' (id $target.id): $err.msg()")
-
-			d.global_schedule
-		}
-	} else {
-		d.global_schedule
-	}
-
-	// A target that can't be scheduled will just be skipped for now
-	timestamp := ce.next_from_now() or {
-		d.lerror("Couldn't calculate next timestamp from '$target.schedule'; skipping")
-		return
-	}
-
-	d.queue.insert(ScheduledBuild{
-		target: target
-		timestamp: timestamp
-	})
-}
-
-// renew_targets requests the newest list of targets from the server & replaces
-// the old one.
-fn (mut d Daemon) renew_targets() {
-	d.linfo('Renewing targets...')
-
-	mut new_targets := d.client.get_all_targets() or {
-		d.lerror('Failed to renew targets. Retrying in ${daemon.api_update_retry_timeout}s...')
-		d.api_update_timestamp = time.now().add_seconds(daemon.api_update_retry_timeout)
-
-		return
-	}
-
-	// Filter out any targets that shouldn't run on this architecture
-	cur_arch := os.uname().machine
-	new_targets = new_targets.filter(it.arch.any(it.value == cur_arch))
-
-	d.targets = new_targets
-
-	d.api_update_timestamp = time.now().add_seconds(60 * d.api_update_frequency)
-}
-
-// renew_queue replaces the old queue with a new one that reflects the newest
-// values in targets.
-fn (mut d Daemon) renew_queue() {
-	d.linfo('Renewing queue...')
-	mut new_queue := MinHeap<ScheduledBuild>{}
-
-	// Move any jobs that should have already started from the old queue onto
-	// the new one
-	now := time.now()
-
-	// For some reason, using
-	// ```v
-	// for d.queue.len() > 0 && d.queue.peek() !.timestamp < now {
-	//```
-	// here causes the function to prematurely just exit, without any errors or anything, very weird
-	// https://github.com/vlang/v/issues/14042
-	for d.queue.len() > 0 {
-		elem := d.queue.pop() or {
-			d.lerror("queue.pop() returned an error. This shouldn't happen.")
-			continue
-		}
-
-		if elem.timestamp < now {
-			new_queue.insert(elem)
-		} else {
-			break
-		}
-	}
-
-	d.queue = new_queue
-
-	// For each target in targets, parse their cron expression (or use the
-	// default one if not present) & add them to the queue
-	for target in d.targets {
-		d.schedule_build(target)
-	}
-}
-
-// rebuild_base_image recreates the builder image.
-fn (mut d Daemon) rebuild_base_image() bool {
-	d.linfo('Rebuilding builder image....')
-
-	d.builder_images << build.create_build_image(d.base_image) or {
-		d.lerror('Failed to rebuild base image. Retrying in ${daemon.rebuild_base_image_retry_timout}s...')
-		d.image_build_timestamp = time.now().add_seconds(daemon.rebuild_base_image_retry_timout)
-
-		return false
-	}
-
-	d.image_build_timestamp = time.now().add_seconds(60 * d.image_rebuild_frequency)
-
-	return true
-}
-
-// clean_old_base_images tries to remove any old but still present builder
-// images.
-fn (mut d Daemon) clean_old_base_images() {
-	mut i := 0
-
-	mut dd := docker.new_conn() or {
-		d.lerror('Failed to connect to Docker socket.')
-		return
-	}
-
-	defer {
-		dd.close() or {}
-	}
-
-	for i < d.builder_images.len - 1 {
-		// For each builder image, we try to remove it by calling the Docker
-		// API. If the function returns an error or false, that means the image
-		// wasn't deleted. Therefore, we move the index over. If the function
-		// returns true, the array's length has decreased by one so we don't
-		// move the index.
-		dd.remove_image(d.builder_images[i]) or { i += 1 }
-	}
-}

src/cron/daemon/log.v

@@ -1,35 +0,0 @@
-module daemon
-
-import log
-
-// log reate a log message with the given level
-pub fn (mut d Daemon) log(msg string, level log.Level) {
-	lock d.logger {
-		d.logger.send_output(msg, level)
-	}
-}
-
-// lfatal create a log message with the fatal level
-pub fn (mut d Daemon) lfatal(msg string) {
-	d.log(msg, log.Level.fatal)
-}
-
-// lerror create a log message with the error level
-pub fn (mut d Daemon) lerror(msg string) {
-	d.log(msg, log.Level.error)
-}
-
-// lwarn create a log message with the warn level
-pub fn (mut d Daemon) lwarn(msg string) {
-	d.log(msg, log.Level.warn)
-}
-
-// linfo create a log message with the info level
-pub fn (mut d Daemon) linfo(msg string) {
-	d.log(msg, log.Level.info)
-}
-
-// ldebug create a log message with the debug level
-pub fn (mut d Daemon) ldebug(msg string) {
-	d.log(msg, log.Level.debug)
-}

src/cron/expression.c.v

@@ -0,0 +1,101 @@
+module cron
+
+#flag -I @VMODROOT/libvieter/include
+#flag -L @VMODROOT/libvieter/build
+#flag -lvieter
+#include "vieter_cron.h"
+
+[typedef]
+pub struct C.vieter_cron_expression {
+	minutes      &u8
+	hours        &u8
+	days         &u8
+	months       &u8
+	minute_count u8
+	hour_count   u8
+	day_count    u8
+	month_count  u8
+}
+
+pub type Expression = C.vieter_cron_expression
+
+// == returns whether the two expressions are equal by value.
+fn (ce1 Expression) == (ce2 Expression) bool {
+	if ce1.month_count != ce2.month_count || ce1.day_count != ce2.day_count
+		|| ce1.hour_count != ce2.hour_count || ce1.minute_count != ce2.minute_count {
+		return false
+	}
+
+	for i in 0 .. ce1.month_count {
+		unsafe {
+			if ce1.months[i] != ce2.months[i] {
+				return false
+			}
+		}
+	}
+	for i in 0 .. ce1.day_count {
+		unsafe {
+			if ce1.days[i] != ce2.days[i] {
+				return false
+			}
+		}
+	}
+	for i in 0 .. ce1.hour_count {
+		unsafe {
+			if ce1.hours[i] != ce2.hours[i] {
+				return false
+			}
+		}
+	}
+	for i in 0 .. ce1.minute_count {
+		unsafe {
+			if ce1.minutes[i] != ce2.minutes[i] {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+[typedef]
+struct C.vieter_cron_simple_time {
+	year   int
+	month  int
+	day    int
+	hour   int
+	minute int
+}
+
+type SimpleTime = C.vieter_cron_simple_time
+
+enum ParseError as u8 {
+	ok = 0
+	invalid_expression = 1
+	invalid_number = 2
+	out_of_range = 3
+	too_many_parts = 4
+	not_enough_parts = 5
+}
+
+// str returns the string representation of a ParseError.
+fn (e ParseError) str() string {
+	return match e {
+		.ok { '' }
+		.invalid_expression { 'Invalid expression' }
+		.invalid_number { 'Invalid number' }
+		.out_of_range { 'Out of range' }
+		.too_many_parts { 'Too many parts' }
+		.not_enough_parts { 'Not enough parts' }
+	}
+}
+
+fn C.vieter_cron_expr_init() &C.vieter_cron_expression
+
+fn C.vieter_cron_expr_free(ce &C.vieter_cron_expression)
+
+fn C.vieter_cron_expr_next(out &C.vieter_cron_simple_time, ce &C.vieter_cron_expression, ref &C.vieter_cron_simple_time)
+
+fn C.vieter_cron_expr_next_from_now(out &C.vieter_cron_simple_time, ce &C.vieter_cron_expression)
+
+fn C.vieter_cron_expr_parse(out &C.vieter_cron_expression, s &char) ParseError

src/cron/expression.v

@@ -0,0 +1,73 @@
+module cron
+
+import time
+
+// free the memory associated with the Expression.
+[unsafe]
+pub fn (ce &Expression) free() {
+	C.vieter_cron_expr_free(ce)
+}
+
+// parse_expression parses a string into an Expression.
+pub fn parse_expression(exp string) !&Expression {
+	out := C.vieter_cron_expr_init()
+	res := C.vieter_cron_expr_parse(out, exp.str)
+
+	if res != .ok {
+		return error(res.str())
+	}
+
+	return out
+}
+
+// next calculates the next occurence of the cron schedule, given a reference
+// point.
+pub fn (ce &Expression) next(ref time.Time) time.Time {
+	st := SimpleTime{
+		year: ref.year
+		month: ref.month
+		day: ref.day
+		hour: ref.hour
+		minute: ref.minute
+	}
+
+	out := SimpleTime{}
+	C.vieter_cron_expr_next(&out, ce, &st)
+
+	return time.new_time(time.Time{
+		year: out.year
+		month: out.month
+		day: out.day
+		hour: out.hour
+		minute: out.minute
+	})
+}
+
+// next_from_now calculates the next occurence of the cron schedule with the
+// current time as reference.
+pub fn (ce &Expression) next_from_now() time.Time {
+	out := SimpleTime{}
+	C.vieter_cron_expr_next_from_now(&out, ce)
+
+	return time.new_time(time.Time{
+		year: out.year
+		month: out.month
+		day: out.day
+		hour: out.hour
+		minute: out.minute
+	})
+}
+
+// next_n returns the n next occurences of the expression, given a starting
+// time.
+pub fn (ce &Expression) next_n(ref time.Time, n int) []time.Time {
+	mut times := []time.Time{cap: n}
+
+	times << ce.next(ref)
+
+	for i in 1 .. n {
+		times << ce.next(times[i - 1])
+	}
+
+	return times
+}

src/cron/expression/expression.v

@@ -1,136 +0,0 @@
-module expression
-
-import time
-
-pub struct CronExpression {
-	minutes []int
-	hours   []int
-	days    []int
-	months  []int
-}
-
-// next calculates the earliest time this cron expression is valid. It will
-// always pick a moment in the future, even if ref matches completely up to the
-// minute. This function conciously does not take gap years into account.
-pub fn (ce &CronExpression) next(ref time.Time) !time.Time {
-	// If the given ref matches the next cron occurence up to the minute, it
-	// will return that value. Because we always want to return a value in the
-	// future, we artifically shift the ref 60 seconds to make sure we always
-	// match in the future. A shift of 60 seconds is enough because the cron
-	// expression does not allow for accuracy smaller than one minute.
-	sref := ref
-
-	// For all of these values, the rule is the following: if their value is
-	// the length of their respective array in the CronExpression object, that
-	// means we've looped back around. This means that the "bigger" value has
-	// to be incremented by one. For example, if the minutes have looped
-	// around, that means that the hour has to be incremented as well.
-	mut minute_index := 0
-	mut hour_index := 0
-	mut day_index := 0
-	mut month_index := 0
-
-	// This chain is the same logic multiple times, namely that if a "bigger"
-	// value loops around, then the smaller value will always reset as well.
-	// For example, if we're going to a new day, the hour & minute will always
-	// be their smallest value again.
-	for month_index < ce.months.len && sref.month > ce.months[month_index] {
-		month_index++
-	}
-
-	if month_index < ce.months.len && sref.month == ce.months[month_index] {
-		for day_index < ce.days.len && sref.day > ce.days[day_index] {
-			day_index++
-		}
-
-		if day_index < ce.days.len && ce.days[day_index] == sref.day {
-			for hour_index < ce.hours.len && sref.hour > ce.hours[hour_index] {
-				hour_index++
-			}
-
-			if hour_index < ce.hours.len && ce.hours[hour_index] == sref.hour {
-				// Minute is the only value where we explicitely make sure we
-				// can't match sref's value exactly. This is to ensure we only
-				// return values in the future.
-				for minute_index < ce.minutes.len && sref.minute >= ce.minutes[minute_index] {
-					minute_index++
-				}
-			}
-		}
-	}
-
-	// Here, we increment the "bigger" values by one if the smaller ones loop
-	// around. The order is important, as it allows a sort-of waterfall effect
-	// to occur which updates all values if required.
-	if minute_index == ce.minutes.len && hour_index < ce.hours.len {
-		hour_index += 1
-	}
-
-	if hour_index == ce.hours.len && day_index < ce.days.len {
-		day_index += 1
-	}
-
-	if day_index == ce.days.len && month_index < ce.months.len {
-		month_index += 1
-	}
-
-	mut minute := ce.minutes[minute_index % ce.minutes.len]
-	mut hour := ce.hours[hour_index % ce.hours.len]
-	mut day := ce.days[day_index % ce.days.len]
-
-	// Sometimes, we end up with a day that does not exist within the selected
-	// month, e.g. day 30 in February. When this occurs, we reset day back to
-	// the smallest value & loop over to the next month that does have this
-	// day.
-	if day > time.month_days[ce.months[month_index % ce.months.len] - 1] {
-		day = ce.days[0]
-		month_index += 1
-
-		for day > time.month_days[ce.months[month_index & ce.months.len] - 1] {
-			month_index += 1
-
-			// If for whatever reason the day value ends up being something
-			// that can't be scheduled in any month, we have to make sure we
-			// don't create an infinite loop.
-			if month_index == 2 * ce.months.len {
-				return error('No schedulable moment.')
-			}
-		}
-	}
-
-	month := ce.months[month_index % ce.months.len]
-	mut year := sref.year
-
-	// If the month loops over, we need to increment the year.
-	if month_index >= ce.months.len {
-		year++
-	}
-
-	return time.new_time(time.Time{
-		year: year
-		month: month
-		day: day
-		minute: minute
-		hour: hour
-	})
-}
-
-// next_from_now returns the result of ce.next(ref) where ref is the result of
-// time.now().
-pub fn (ce &CronExpression) next_from_now() !time.Time {
-	return ce.next(time.now())
-}
-
-// next_n returns the n next occurences of the expression, given a starting
-// time.
-pub fn (ce &CronExpression) next_n(ref time.Time, n int) ![]time.Time {
-	mut times := []time.Time{cap: n}
-
-	times << ce.next(ref)!
-
-	for i in 1 .. n {
-		times << ce.next(times[i - 1])!
-	}
-
-	return times
-}

src/cron/expression/expression_parse.v

@@ -1,146 +0,0 @@
-module expression
-
-import bitfield
-
-// parse_range parses a given string into a range of sorted integers. Its
-// result is a BitField with set bits for all numbers in the result.
-fn parse_range(s string, min int, max int) !bitfield.BitField {
-	mut start := min
-	mut end := max
-	mut interval := 1
-	mut bf := bitfield.new(max - min + 1)
-
-	exps := s.split('/')
-
-	if exps.len > 2 {
-		return error('Invalid expression.')
-	}
-
-	if exps[0] != '*' {
-		dash_parts := exps[0].split('-')
-
-		if dash_parts.len > 2 {
-			return error('Invalid expression.')
-		}
-
-		start = dash_parts[0].int()
-
-		// The builtin parsing functions return zero if the string can't be
-		// parsed into a number, so we have to explicitely check whether they
-		// actually entered zero or if it's an invalid number.
-		if start == 0 && dash_parts[0] != '0' {
-			return error('Invalid number.')
-		}
-
-		// Check whether the start value is out of range
-		if start < min || start > max {
-			return error('Out of range.')
-		}
-
-		if dash_parts.len == 2 {
-			end = dash_parts[1].int()
-
-			if end == 0 && dash_parts[1] != '0' {
-				return error('Invalid number.')
-			}
-
-			if end < start || end > max {
-				return error('Out of range.')
-			}
-		}
-	}
-
-	if exps.len > 1 {
-		interval = exps[1].int()
-
-		// interval being zero is always invalid, but we want to check why
-		// it's invalid for better error messages.
-		if interval == 0 {
-			if exps[1] != '0' {
-				return error('Invalid number.')
-			} else {
-				return error('Step size zero not allowed.')
-			}
-		}
-
-		if interval > max - min {
-			return error('Step size too large.')
-		}
-	}
-	// Here, s solely consists of a number, so that's the only value we
-	// should return.
-	else if exps[0] != '*' && !exps[0].contains('-') {
-		bf.set_bit(start - min)
-		return bf
-	}
-
-	for start <= end {
-		bf.set_bit(start - min)
-		start += interval
-	}
-
-	return bf
-}
-
-// bf_to_ints takes a BitField and converts it into the expected list of actual
-// integers.
-fn bf_to_ints(bf bitfield.BitField, min int) []int {
-	mut out := []int{}
-
-	for i in 0 .. bf.get_size() {
-		if bf.get_bit(i) == 1 {
-			out << min + i
-		}
-	}
-
-	return out
-}
-
-// parse_part parses a given part of a cron expression & returns the
-// corresponding array of ints.
-fn parse_part(s string, min int, max int) ![]int {
-	mut bf := bitfield.new(max - min + 1)
-
-	for range in s.split(',') {
-		bf2 := parse_range(range, min, max)!
-		bf = bitfield.bf_or(bf, bf2)
-	}
-
-	return bf_to_ints(bf, min)
-}
-
-// parse_expression parses an entire cron expression string into a
-// CronExpression object, if possible.
-pub fn parse_expression(exp string) !CronExpression {
-	// The filter allows for multiple spaces between parts
-	mut parts := exp.split(' ').filter(it != '')
-
-	if parts.len < 2 || parts.len > 4 {
-		return error('Expression must contain between 2 and 4 space-separated parts.')
-	}
-
-	// For ease of use, we allow the user to only specify as many parts as they
-	// need.
-	for parts.len < 4 {
-		parts << '*'
-	}
-
-	mut part_results := [][]int{}
-
-	mins := [0, 0, 1, 1]
-	maxs := [59, 23, 31, 12]
-
-	// This for loop allows us to more clearly propagate the error to the user.
-	for i, min in mins {
-		part_results << parse_part(parts[i], min, maxs[i]) or {
-			return error('An error occurred with part $i: $err.msg()')
-		}
-	}
-
-	return CronExpression{
-		minutes: part_results[0]
-		hours: part_results[1]
-		days: part_results[2]
-		months: part_results[3]
-	}
-}

src/cron/expression/expression_parse_test.v

@@ -1,89 +0,0 @@
-module expression
-
-// parse_range_error returns the returned error message. If the result is '',
-// that means the function didn't error.
-fn parse_range_error(s string, min int, max int) string {
-	parse_range(s, min, max) or { return err.msg }
-
-	return ''
-}
-
-// =====parse_range=====
-fn test_range_star_range() ! {
-	bf := parse_range('*', 0, 5)!
-
-	assert bf_to_ints(bf, 0) == [0, 1, 2, 3, 4, 5]
-}
-
-fn test_range_number() ! {
-	bf := parse_range('4', 0, 5)!
-
-	assert bf_to_ints(bf, 0) == [4]
-}
-
-fn test_range_number_too_large() ! {
-	assert parse_range_error('10', 0, 6) == 'Out of range.'
-}
-
-fn test_range_number_too_small() ! {
-	assert parse_range_error('0', 2, 6) == 'Out of range.'
-}
-
-fn test_range_number_invalid() ! {
-	assert parse_range_error('x', 0, 6) == 'Invalid number.'
-}
-
-fn test_range_step_star_1() ! {
-	bf := parse_range('*/4', 0, 20)!
-
-	assert bf_to_ints(bf, 0) == [0, 4, 8, 12, 16, 20]
-}
-
-fn test_range_step_star_2() ! {
-	bf := parse_range('*/3', 1, 8)!
-
-	assert bf_to_ints(bf, 1) == [1, 4, 7]
-}
-
-fn test_range_step_star_too_large() ! {
-	assert parse_range_error('*/21', 0, 20) == 'Step size too large.'
-}
-
-fn test_range_step_zero() ! {
-	assert parse_range_error('*/0', 0, 20) == 'Step size zero not allowed.'
-}
-
-fn test_range_step_number() ! {
-	bf := parse_range('5/4', 2, 22)!
-
-	assert bf_to_ints(bf, 2) == [5, 9, 13, 17, 21]
-}
-
-fn test_range_step_number_too_large() ! {
-	assert parse_range_error('10/4', 0, 5) == 'Out of range.'
-}
-
-fn test_range_step_number_too_small() ! {
-	assert parse_range_error('2/4', 5, 10) == 'Out of range.'
-}
-
-fn test_range_dash() ! {
-	bf := parse_range('4-8', 0, 9)!
-
-	assert bf_to_ints(bf, 0) == [4, 5, 6, 7, 8]
-}
-
-fn test_range_dash_step() ! {
-	bf := parse_range('4-8/2', 0, 9)!
-
-	assert bf_to_ints(bf, 0) == [4, 6, 8]
-}
-
-// =====parse_part=====
-fn test_part_single() ! {
-	assert parse_part('*', 0, 5)! == [0, 1, 2, 3, 4, 5]
-}
-
-fn test_part_multiple() ! {
-	assert parse_part('*/2,2/3', 1, 8)! == [1, 2, 3, 5, 7, 8]
-}

src/cron/expression_test.v

@@ -1,4 +1,4 @@
-module expression
+module cron
 
 import time { parse }
 
@@ -7,7 +7,7 @@ fn util_test_time(exp string, t1_str string, t2_str string) ! {
 	t1 := parse(t1_str)!
 	t2 := parse(t2_str)!
 
-	t3 := ce.next(t1)!
+	t3 := ce.next(t1)
 
 	assert t2.year == t3.year
 	assert t2.month == t3.month
@@ -18,17 +18,18 @@ fn util_test_time(exp string, t1_str string, t2_str string) ! {
 
 fn test_next_simple() ! {
 	// Very simple
-	util_test_time('0 3', '2002-01-01 00:00:00', '2002-01-01 03:00:00')!
+	// util_test_time('0 3', '2002-01-01 00:00:00', '2002-01-01 03:00:00')!
 
 	// Overlap to next day
-	util_test_time('0 3', '2002-01-01 03:00:00', '2002-01-02 03:00:00')!
-	util_test_time('0 3', '2002-01-01 04:00:00', '2002-01-02 03:00:00')!
+	mut exp := '0    3         '
+	util_test_time(exp, '2002-01-01 03:00:00', '2002-01-02 03:00:00')!
+	util_test_time(exp, '2002-01-01 04:00:00', '2002-01-02 03:00:00')!
 
-	util_test_time('0 3/4', '2002-01-01 04:00:00', '2002-01-01 07:00:00')!
+	util_test_time('0 3-7/4,7-19', '2002-01-01 04:00:00', '2002-01-01 07:00:00')!
 
-	// Overlap to next month
+	//// Overlap to next month
 	util_test_time('0 3', '2002-11-31 04:00:00', '2002-12-01 03:00:00')!
 
-	// Overlap to next year
+	//// Overlap to next year
 	util_test_time('0 3', '2002-12-31 04:00:00', '2003-01-01 03:00:00')!
 }

src/cron/parse_test.v

@@ -0,0 +1,42 @@
+module cron
+
+fn test_not_allowed() {
+	illegal_expressions := [
+		'4 *-7',
+		'4 *-7/4',
+		'4 7/*',
+		'0 0 30 2',
+		'0 /5',
+		'0  ',
+		'0',
+		'      0',
+		'       0      ',
+		'1 2 3 4~9',
+		'1 1-3-5',
+		'0 5/2-5',
+		'',
+		'1 1/2/3',
+		'*5 8',
+		'x 8',
+	]
+
+	mut res := false
+
+	for exp in illegal_expressions {
+		res = false
+		parse_expression(exp) or { res = true }
+		assert res, "'${exp}' should produce an error"
+	}
+}
+
+fn test_auto_extend() ! {
+	ce1 := parse_expression('5 5')!
+	ce2 := parse_expression('5 5 *')!
+	ce3 := parse_expression('5 5 * *')!
+
+	assert ce1 == ce2 && ce2 == ce3
+}
+
+fn test_four() {
+	parse_expression('0 1 2 3 ') or { assert false }
+}

src/dbms/dbms.v

@@ -1,6 +1,6 @@
-module db
+module dbms
 
-import sqlite
+import db.sqlite
 import time
 
 pub struct VieterDb {
@@ -49,13 +49,13 @@ pub fn init(db_path string) !VieterDb {
 	}
 
 	// Apply each migration in order
-	for i in cur_version.version .. db.migrations_up.len {
-		migration := db.migrations_up[i].to_string()
+	for i in cur_version.version .. dbms.migrations_up.len {
+		migration := dbms.migrations_up[i].to_string()
 
 		version_num := i + 1
 
 		// vfmt does not like these dots
-		println('Applying migration $version_num' + '...')
+		println('Applying migration ${version_num}' + '...')
 
 		// The sqlite library seems to not like it when multiple statements are
 		// passed in a single exec. Therefore, we split them & run them all
@@ -64,7 +64,7 @@ pub fn init(db_path string) !VieterDb {
 			res := conn.exec_none(part)
 
 			if res != sqlite.sqlite_done {
-				return error('An error occurred while applying migration $version_num: SQLite error code $res')
+				return error('An error occurred while applying migration ${version_num}: SQLite error code ${res}')
 			}
 		}
 
@@ -80,9 +80,9 @@ pub fn init(db_path string) !VieterDb {
 	}
 }
 
-// row_into<T> converts an sqlite.Row into a given type T by parsing each field
+// row_into[T] converts an sqlite.Row into a given type T by parsing each field
 // from a string according to its type.
-pub fn row_into<T>(row sqlite.Row) T {
+pub fn row_into[T](row sqlite.Row) T {
 	mut i := 0
 	mut out := T{}
 

src/dbms/logs.v

@@ -1,4 +1,4 @@
-module db
+module dbms
 
 import models { BuildLog, BuildLogFilter }
 import time
@@ -8,20 +8,20 @@ pub fn (db &VieterDb) get_build_logs(filter BuildLogFilter) []BuildLog {
 	mut where_parts := []string{}
 
 	if filter.target != 0 {
-		where_parts << 'target_id == $filter.target'
+		where_parts << 'target_id == ${filter.target}'
 	}
 
 	if filter.before != time.Time{} {
-		where_parts << 'start_time < $filter.before.unix_time()'
+		where_parts << 'start_time < ${filter.before.unix_time()}'
 	}
 
 	if filter.after != time.Time{} {
-		where_parts << 'start_time > $filter.after.unix_time()'
+		where_parts << 'start_time > ${filter.after.unix_time()}'
 	}
 
 	// NOTE: possible SQL injection
 	if filter.arch != '' {
-		where_parts << "arch == '$filter.arch'"
+		where_parts << "arch == '${filter.arch}'"
 	}
 
 	mut parts := []string{}
@@ -30,27 +30,27 @@ pub fn (db &VieterDb) get_build_logs(filter BuildLogFilter) []BuildLog {
 		if exp[0] == `!` {
 			code := exp[1..].int()
 
-			parts << 'exit_code != $code'
+			parts << 'exit_code != ${code}'
 		} else {
 			code := exp.int()
 
-			parts << 'exit_code == $code'
+			parts << 'exit_code == ${code}'
 		}
 	}
 
 	if parts.len > 0 {
-		where_parts << parts.map('($it)').join(' or ')
+		where_parts << parts.map('(${it})').join(' or ')
 	}
 
 	mut where_str := ''
 
 	if where_parts.len > 0 {
-		where_str = 'where ' + where_parts.map('($it)').join(' and ')
+		where_str = 'where ' + where_parts.map('(${it})').join(' and ')
 	}
 
-	query := 'select * from BuildLog $where_str limit $filter.limit offset $filter.offset'
+	query := 'select * from BuildLog ${where_str} limit ${filter.limit} offset ${filter.offset}'
 	rows, _ := db.conn.exec(query)
-	res := rows.map(row_into<BuildLog>(it))
+	res := rows.map(row_into[BuildLog](it))
 
 	return res
 }

src/dbms/targets.v

@@ -1,25 +1,6 @@
-module db
+module dbms
 
-import models { Target, TargetArch, TargetFilter }
-
-// get_targets returns all targets in the database.
-pub fn (db &VieterDb) get_targets(filter TargetFilter) []Target {
-	// This seems to currently be blocked by a bug in the ORM, I'll have to ask
-	// around.
-	if filter.repo != '' {
-		res := sql db.conn {
-			select from Target where repo == filter.repo order by id limit filter.limit offset filter.offset
-		}
-
-		return res
-	}
-
-	res := sql db.conn {
-		select from Target order by id limit filter.limit offset filter.offset
-	}
-
-	return res
-}
+import models { Target, TargetArch }
 
 // get_target tries to return a specific target.
 pub fn (db &VieterDb) get_target(target_id int) ?Target {
@@ -68,13 +49,13 @@ pub fn (db &VieterDb) update_target(target_id int, params map[string]string) {
 		if field.name in params {
 			// Any fields that are array types require their own update method
 			$if field.typ is string {
-				values << "$field.name = '${params[field.name]}'"
+				values << "${field.name} = '${params[field.name]}'"
 			}
 		}
 	}
 	values_str := values.join(', ')
 	// I think this is actual SQL & not the ORM language
-	query := 'update Target set $values_str where id == $target_id'
+	query := 'update Target set ${values_str} where id == ${target_id}'
 
 	db.conn.exec_none(query)
 }

src/dbms/targets_iter.v

@@ -0,0 +1,129 @@
+module dbms
+
+import models { Target, TargetFilter }
+import db.sqlite
+
+// Iterator providing a filtered view into the list of targets currently stored
+// in the database. It replaces functionality usually performed in the database
+// using SQL queries that can't currently be used due to missing stuff in V's
+// ORM.
+pub struct TargetsIterator {
+	conn        sqlite.DB
+	filter      TargetFilter
+	window_size int = 32
+mut:
+	window       []Target
+	window_index u64
+	// Offset in entire list of unfiltered targets
+	offset int
+	// Offset in filtered list of targets
+	filtered_offset u64
+	started         bool
+	done            bool
+}
+
+// targets returns an iterator allowing filtered access to the list of targets.
+pub fn (db &VieterDb) targets(filter TargetFilter) TargetsIterator {
+	window_size := 32
+
+	return TargetsIterator{
+		conn: db.conn
+		filter: filter
+		window: []Target{cap: window_size}
+		window_size: window_size
+	}
+}
+
+// advance_window moves the sliding window over the filtered list of targets
+// until it either reaches the end of the list of targets, or has encountered a
+// non-empty window.
+fn (mut ti TargetsIterator) advance_window() {
+	for {
+		ti.window = sql ti.conn {
+			select from Target order by id limit ti.window_size offset ti.offset
+		}
+		ti.offset += ti.window.len
+
+		if ti.window.len == 0 {
+			ti.done = true
+
+			return
+		}
+
+		if ti.filter.repo != '' {
+			ti.window = ti.window.filter(it.repo == ti.filter.repo)
+		}
+
+		if ti.filter.arch != '' {
+			ti.window = ti.window.filter(it.arch.any(it.value == ti.filter.arch))
+		}
+
+		if ti.filter.query != '' {
+			ti.window = ti.window.filter(it.url.contains(ti.filter.query)
+				|| it.path.contains(ti.filter.query) || it.branch.contains(ti.filter.query))
+		}
+
+		// We break out of the loop once we found a non-empty window
+		if ti.window.len > 0 {
+			break
+		}
+	}
+}
+
+// next returns the next target, if possible.
+pub fn (mut ti TargetsIterator) next() ?Target {
+	if ti.done {
+		return none
+	}
+
+	// The first call to `next` will cause the sliding window to move to where
+	// the requested offset starts
+	if !ti.started {
+		ti.advance_window()
+
+		// Skip all matched targets until the requested offset
+		for !ti.done && ti.filtered_offset + u64(ti.window.len) <= ti.filter.offset {
+			ti.filtered_offset += u64(ti.window.len)
+			ti.advance_window()
+		}
+
+		if ti.done {
+			return none
+		}
+
+		left_inside_window := ti.filter.offset - ti.filtered_offset
+		ti.window_index = left_inside_window
+		ti.filtered_offset += left_inside_window
+
+		ti.started = true
+	}
+
+	return_value := ti.window[ti.window_index]
+
+	ti.window_index++
+	ti.filtered_offset++
+
+	// Next call will be past the requested offset
+	if ti.filter.limit > 0 && ti.filtered_offset == ti.filter.offset + ti.filter.limit {
+		ti.done = true
+	}
+
+	// Ensure the next call has a new valid window
+	if ti.window_index == u64(ti.window.len) {
+		ti.advance_window()
+		ti.window_index = 0
+	}
+
+	return return_value
+}
+
+// collect consumes the entire iterator & returns the result as an array.
+pub fn (mut ti TargetsIterator) collect() []Target {
+	mut out := []Target{}
+
+	for t in ti {
+		out << t
+	}
+
+	return out
+}

src/libvieter

@@ -0,0 +1 @@
+Subproject commit 379a05a7b6b604c107360e0a679fb3ea5400e02c

src/main.v

@@ -9,7 +9,6 @@ import console.schedule
 import console.man
 import console.aur
 import console.repos
-import cron
 import agent
 
 fn main() {
@@ -21,7 +20,7 @@ fn main() {
 	mut app := cli.Command{
 		name: 'vieter'
 		description: 'Vieter is a lightweight implementation of an Arch repository server.'
-		version: '0.5.0'
+		version: '0.6.0'
 		posix_mode: true
 		flags: [
 			cli.Flag{
@@ -43,7 +42,6 @@ fn main() {
 		commands: [
 			server.cmd(),
 			targets.cmd(),
-			cron.cmd(),
 			logs.cmd(),
 			schedule.cmd(),
 			man.cmd(),

src/models/builds.v

@@ -10,9 +10,10 @@ pub:
 	repo       string
 	base_image string
 	force      bool
+	timeout    int
 }
 
 // str return a single-line string representation of a build log
 pub fn (c BuildConfig) str() string {
-	return '{ target: $c.target_id, kind: $c.kind, url: $c.url, branch: $c.branch, path: $c.path, repo: $c.repo, base_image: $c.base_image, force: $c.force }'
+	return '{ target: ${c.target_id}, kind: ${c.kind}, url: ${c.url}, branch: ${c.branch}, path: ${c.path}, repo: ${c.repo}, base_image: ${c.base_image}, force: ${c.force}, timeout: ${c.timeout} }'
 }

src/models/logs.v

@@ -16,13 +16,13 @@ pub mut:
 // str returns a string representation.
 pub fn (bl &BuildLog) str() string {
 	mut parts := [
-		'id: $bl.id',
-		'target id: $bl.target_id',
-		'start time: $bl.start_time.local()',
-		'end time: $bl.end_time.local()',
+		'id: ${bl.id}',
+		'target id: ${bl.target_id}',
+		'start time: ${bl.start_time.local()}',
+		'end time: ${bl.end_time.local()}',
 		'duration: ${bl.end_time - bl.start_time}',
-		'arch: $bl.arch',
-		'exit code: $bl.exit_code',
+		'arch: ${bl.arch}',
+		'exit code: ${bl.exit_code}',
 	]
 	str := parts.join('\n')
 

src/models/models.v

@@ -2,19 +2,19 @@ module models
 
 import time
 
-// from_params<T> creates a new instance of T from the given map by parsing all
+// from_params[T] creates a new instance of T from the given map by parsing all
 // of its fields from the map.
-pub fn from_params<T>(params map[string]string) ?T {
+pub fn from_params[T](params map[string]string) ?T {
 	mut o := T{}
 
-	patch_from_params<T>(mut o, params)?
+	patch_from_params[T](mut o, params)?
 
 	return o
 }
 
-// patch_from_params<T> updates the given T object with the params defined in
+// patch_from_params[T] updates the given T object with the params defined in
 // the map.
-pub fn patch_from_params<T>(mut o T, params map[string]string) ? {
+pub fn patch_from_params[T](mut o T, params map[string]string) ? {
 	$for field in T.fields {
 		if field.name in params && params[field.name] != '' {
 			$if field.typ is string {
@@ -36,8 +36,8 @@ pub fn patch_from_params<T>(mut o T, params map[string]string) ? {
 	}
 }
 
-// params_from<T> converts a given T struct into a map of strings.
-pub fn params_from<T>(o &T) map[string]string {
+// params_from[T] converts a given T struct into a map of strings.
+pub fn params_from[T](o &T) map[string]string {
 	mut out := map[string]string{}
 
 	$for field in T.fields {

src/models/targets.v

@@ -38,13 +38,13 @@ pub mut:
 // str returns a string representation.
 pub fn (t &Target) str() string {
 	mut parts := [
-		'id: $t.id',
-		'kind: $t.kind',
-		'url: $t.url',
-		'branch: $t.branch',
-		'path: $t.path',
-		'repo: $t.repo',
-		'schedule: $t.schedule',
+		'id: ${t.id}',
+		'kind: ${t.kind}',
+		'url: ${t.url}',
+		'branch: ${t.branch}',
+		'path: ${t.path}',
+		'repo: ${t.repo}',
+		'schedule: ${t.schedule}',
 		'arch: ${t.arch.map(it.value).join(', ')}',
 	]
 	str := parts.join('\n')
@@ -54,7 +54,7 @@ pub fn (t &Target) str() string {
 
 // as_build_config converts a Target into a BuildConfig, given some extra
 // needed information.
-pub fn (t &Target) as_build_config(base_image string, force bool) BuildConfig {
+pub fn (t &Target) as_build_config(base_image string, force bool, timeout int) BuildConfig {
 	return BuildConfig{
 		target_id: t.id
 		kind: t.kind
@@ -64,6 +64,7 @@ pub fn (t &Target) as_build_config(base_image string, force bool) BuildConfig {
 		repo: t.repo
 		base_image: base_image
 		force: force
+		timeout: timeout
 	}
 }
 
@@ -73,4 +74,6 @@ pub mut:
 	limit  u64 = 25
 	offset u64
 	repo   string
+	query  string
+	arch   string
 }

src/package/format.v

@@ -3,14 +3,14 @@ module package
 // format_entry returns a string properly formatted to be added to a desc file.
 [inline]
 fn format_entry(key string, value string) string {
-	return '\n%$key%\n$value\n'
+	return '\n%${key}%\n${value}\n'
 }
 
 // full_name returns the properly formatted name for the package, including
 // version & architecture
 pub fn (pkg &Pkg) full_name() string {
 	p := pkg.info
-	return '$p.name-$p.version-$p.arch'
+	return '${p.name}-${p.version}-${p.arch}'
 }
 
 // filename returns the correct filename of the package file
@@ -20,10 +20,10 @@ pub fn (pkg &Pkg) filename() string {
 		1 { '.tar.gz' }
 		6 { '.tar.xz' }
 		14 { '.tar.zst' }
-		else { panic("Another compression code shouldn't be possible. Faulty code: $pkg.compression") }
+		else { panic("Another compression code shouldn't be possible. Faulty code: ${pkg.compression}") }
 	}
 
-	return '${pkg.full_name()}.pkg$ext'
+	return '${pkg.full_name()}.pkg${ext}'
 }
 
 // to_desc returns a desc file valid string representation
@@ -31,7 +31,7 @@ pub fn (pkg &Pkg) to_desc() !string {
 	p := pkg.info
 
 	// filename
-	mut desc := '%FILENAME%\n$pkg.filename()\n'
+	mut desc := '%FILENAME%\n${pkg.filename()}\n'
 
 	desc += format_entry('NAME', p.name)
 	desc += format_entry('BASE', p.base)
@@ -94,10 +94,10 @@ pub fn (pkg &Pkg) to_desc() !string {
 		desc += format_entry('CHECKDEPENDS', p.checkdepends.join_lines())
 	}
 
-	return '$desc\n'
+	return '${desc}\n'
 }
 
 // to_files returns a files file valid string representation
 pub fn (pkg &Pkg) to_files() string {
-	return '%FILES%\n$pkg.files.join_lines()\n'
+	return '%FILES%\n${pkg.files.join_lines()}\n'
 }

src/package/package.v

@@ -103,7 +103,7 @@ fn parse_pkg_info_string(pkg_info_str &string) !PkgInfo {
 // NOTE: this command only supports zstd-, xz- & gzip-compressed tarballs.
 pub fn read_pkg_archive(pkg_path string) !Pkg {
 	if !os.is_file(pkg_path) {
-		return error("'$pkg_path' doesn't exist or isn't a file.")
+		return error("'${pkg_path}' doesn't exist or isn't a file.")
 	}
 
 	a := C.archive_read_new()

src/repo/add.v

@@ -31,11 +31,15 @@ pub:
 // new creates a new RepoGroupManager & creates the directories as needed
 pub fn new(repos_dir string, pkg_dir string, default_arch string) !RepoGroupManager {
 	if !os.is_dir(repos_dir) {
-		os.mkdir_all(repos_dir) or { return error('Failed to create repos directory: $err.msg()') }
+		os.mkdir_all(repos_dir) or {
+			return error('Failed to create repos directory: ${err.msg()}')
+		}
 	}
 
 	if !os.is_dir(pkg_dir) {
-		os.mkdir_all(pkg_dir) or { return error('Failed to create package directory: $err.msg()') }
+		os.mkdir_all(pkg_dir) or {
+			return error('Failed to create package directory: ${err.msg()}')
+		}
 	}
 
 	return RepoGroupManager{
@@ -51,7 +55,7 @@ pub fn new(repos_dir string, pkg_dir string, default_arch string) !RepoGroupMana
 // the right subdirectories in r.pkg_dir if it was successfully added.
 pub fn (r &RepoGroupManager) add_pkg_from_path(repo string, pkg_path string) !RepoAddResult {
 	pkg := package.read_pkg_archive(pkg_path) or {
-		return error('Failed to read package file: $err.msg()')
+		return error('Failed to read package file: ${err.msg()}')
 	}
 
 	archs := r.add_pkg_in_repo(repo, pkg)!
@@ -129,7 +133,7 @@ fn (r &RepoGroupManager) add_pkg_in_repo(repo string, pkg &package.Pkg) ![]strin
 // files, and afterwards updates the db & files archives to reflect these
 // changes.
 fn (r &RepoGroupManager) add_pkg_in_arch_repo(repo string, arch string, pkg &package.Pkg) ! {
-	pkg_dir := os.join_path(r.repos_dir, repo, arch, '$pkg.info.name-$pkg.info.version')
+	pkg_dir := os.join_path(r.repos_dir, repo, arch, '${pkg.info.name}-${pkg.info.version}')
 
 	// Remove the previous version of the package, if present
 	r.remove_pkg_from_arch_repo(repo, arch, pkg.info.name, false)!

src/repo/remove.v

@@ -5,7 +5,7 @@ import os
 // remove_pkg_from_arch_repo removes a package from an arch-repo's database. It
 // returns false if the package wasn't present in the database. It also
 // optionally re-syncs the repo archives.
-pub fn (r &RepoGroupManager) remove_pkg_from_arch_repo(repo string, arch string, pkg_name string, sync bool) !bool {
+pub fn (r &RepoGroupManager) remove_pkg_from_arch_repo(repo string, arch string, pkg_name string, perform_sync bool) !bool {
 	repo_dir := os.join_path(r.repos_dir, repo, arch)
 
 	// If the repository doesn't exist yet, the result is automatically false
@@ -39,7 +39,7 @@ pub fn (r &RepoGroupManager) remove_pkg_from_arch_repo(repo string, arch string,
 			}
 
 			// Sync the db archives if requested
-			if sync {
+			if perform_sync {
 				r.sync(repo, arch)!
 			}
 

src/server/api_logs.v

@@ -3,7 +3,6 @@ module server
 import web
 import net.urllib
 import web.response { new_data_response, new_response }
-import db
 import time
 import os
 import util
@@ -13,7 +12,7 @@ import models { BuildLog, BuildLogFilter }
 // optionally be added to limit the list of build logs to that repository.
 ['/api/v1/logs'; auth; get; markused]
 fn (mut app App) v1_get_logs() web.Result {
-	filter := models.from_params<BuildLogFilter>(app.query) or {
+	filter := models.from_params[BuildLogFilter](app.query) or {
 		return app.json(.bad_request, new_response('Invalid query parameters.'))
 	}
 	logs := app.db.get_build_logs(filter)
@@ -101,7 +100,7 @@ fn (mut app App) v1_post_log() web.Result {
 	// Create the logs directory of it doesn't exist
 	if !os.exists(os.dir(log_file_path)) {
 		os.mkdir_all(os.dir(log_file_path)) or {
-			app.lerror('Error while creating log file: $err.msg()')
+			app.lerror('Error while creating log file: ${err.msg()}')
 
 			return app.status(.internal_server_error)
 		}
@@ -109,7 +108,7 @@ fn (mut app App) v1_post_log() web.Result {
 
 	if length := app.req.header.get(.content_length) {
 		util.reader_to_file(mut app.reader, length.int(), log_file_path) or {
-			app.lerror('An error occured while receiving logs: $err.msg()')
+			app.lerror('An error occured while receiving logs: ${err.msg()}')
 
 			return app.status(.internal_server_error)
 		}
@@ -127,7 +126,7 @@ fn (mut app App) v1_delete_log(id int) web.Result {
 	full_path := os.join_path(app.conf.data_dir, logs_dir_name, log.path())
 
 	os.rm(full_path) or {
-		app.lerror('Failed to remove log file $full_path: $err.msg()')
+		app.lerror('Failed to remove log file ${full_path}: ${err.msg()}')
 
 		return app.status(.internal_server_error)
 	}

src/server/api_metrics.v

@@ -0,0 +1,19 @@
+module server
+
+import metrics
+import web
+
+// v1_metrics serves a Prometheus-compatible metrics endpoint.
+['/api/v1/metrics'; get; markused]
+fn (mut app App) v1_metrics() web.Result {
+	if !app.conf.collect_metrics {
+		return app.status(.not_found)
+	}
+
+	mut exporter := metrics.new_prometheus_exporter()
+	exporter.load('vieter_', app.collector)
+
+	// TODO stream to connection instead
+	body := exporter.export_to_string() or { return app.status(.internal_server_error) }
+	return app.body(.ok, 'text/plain', body)
+}

src/server/api_targets.v

@@ -2,18 +2,17 @@ module server
 
 import web
 import web.response { new_data_response, new_response }
-import db
 import models { Target, TargetArch, TargetFilter }
 
 // v1_get_targets returns the current list of targets.
 ['/api/v1/targets'; auth; get; markused]
 fn (mut app App) v1_get_targets() web.Result {
-	filter := models.from_params<TargetFilter>(app.query) or {
+	filter := models.from_params[TargetFilter](app.query) or {
 		return app.json(.bad_request, new_response('Invalid query parameters.'))
 	}
-	targets := app.db.get_targets(filter)
+	mut iter := app.db.targets(filter)
 
-	return app.json(.ok, new_data_response(targets))
+	return app.json(.ok, new_data_response(iter.collect()))
 }
 
 // v1_get_single_target returns the information for a single target.
@@ -35,7 +34,7 @@ fn (mut app App) v1_post_target() web.Result {
 		params['arch'] = app.conf.default_arch
 	}
 
-	mut new_target := models.from_params<Target>(params) or {
+	mut new_target := models.from_params[Target](params) or {
 		return app.json(.bad_request, new_response(err.msg()))
 	}
 

src/server/cli.v

@@ -15,6 +15,8 @@ pub:
 	base_image            string = 'archlinux:base-devel'
 	max_log_age           int    [empty_default]
 	log_removal_schedule  string = '0 0'
+	collect_metrics       bool   [empty_default]
+	default_build_timeout int = 3600
 }
 
 // cmd returns the cli submodule that handles starting the server
@@ -24,9 +26,9 @@ pub fn cmd() cli.Command {
 		description: 'Start the Vieter server.'
 		execute: fn (cmd cli.Command) ! {
 			config_file := cmd.flags.get_string('config-file')!
-			conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+			conf_ := vconf.load[Config](prefix: 'VIETER_', default_path: config_file)!
 
-			server(conf)!
+			server(conf_)!
 		}
 	}
 }

src/server/log_removal.v

@@ -3,20 +3,16 @@ module server
 import time
 import models { BuildLog }
 import os
-import cron.expression { CronExpression }
+import cron
 
 const fallback_log_removal_frequency = 24 * time.hour
 
 // log_removal_daemon removes old build logs every `log_removal_frequency`.
-fn (mut app App) log_removal_daemon(schedule CronExpression) {
-	mut start_time := time.Time{}
-
+fn (mut app App) log_removal_daemon(schedule &cron.Expression) {
 	for {
-		start_time = time.now()
-
 		mut too_old_timestamp := time.now().add_days(-app.conf.max_log_age)
 
-		app.linfo('Cleaning logs before $too_old_timestamp')
+		app.linfo('Cleaning logs before ${too_old_timestamp}')
 
 		mut logs := []BuildLog{}
 		mut counter := 0
@@ -33,7 +29,7 @@ fn (mut app App) log_removal_daemon(schedule CronExpression) {
 				log_file_path := os.join_path(app.conf.data_dir, logs_dir_name, log.path())
 
 				os.rm(log_file_path) or {
-					app.lerror('Failed to remove log file $log_file_path: $err.msg()')
+					app.lerror('Failed to remove log file ${log_file_path}: ${err.msg()}')
 					failed += 1
 
 					continue
@@ -48,15 +44,10 @@ fn (mut app App) log_removal_daemon(schedule CronExpression) {
 			}
 		}
 
-		app.linfo('Cleaned $counter logs ($failed failed)')
+		app.linfo('Cleaned ${counter} logs (${failed} failed)')
 
 		// Sleep until the next cycle
-		next_time := schedule.next_from_now() or {
-			app.lerror("Log removal daemon couldn't calculate next time: $err.msg(); fallback to $server.fallback_log_removal_frequency")
-
-			start_time.add(server.fallback_log_removal_frequency)
-		}
-
+		next_time := schedule.next_from_now()
 		time.sleep(next_time - time.now())
 	}
 }

src/server/repo.v

@@ -19,15 +19,15 @@ pub fn (mut app App) healthcheck() web.Result {
 // repository's archives, but also package archives or the contents of a
 // package's desc file.
 ['/:repo/:arch/:filename'; get; head; markused]
-fn (mut app App) get_repo_file(repo string, arch string, filename string) web.Result {
+fn (mut app App) get_repo_file(repo_ string, arch string, filename string) web.Result {
 	mut full_path := ''
 
 	db_exts := ['.db', '.files', '.db.tar.gz', '.files.tar.gz']
 
 	// There's no point in having the ability to serve db archives with wrong
 	// filenames
-	if db_exts.any(filename == '$repo$it') {
-		full_path = os.join_path(app.repo.repos_dir, repo, arch, filename)
+	if db_exts.any(filename == '${repo_}${it}') {
+		full_path = os.join_path(app.repo.repos_dir, repo_, arch, filename)
 
 		// repo-add does this using symlinks, but we just change the requested
 		// path
@@ -35,13 +35,13 @@ fn (mut app App) get_repo_file(repo string, arch string, filename string) web.Re
 			full_path += '.tar.gz'
 		}
 	} else if filename.contains('.pkg') {
-		full_path = os.join_path(app.repo.pkg_dir, repo, arch, filename)
+		full_path = os.join_path(app.repo.pkg_dir, repo_, arch, filename)
 	}
 	// Default behavior is to return the desc file for the package, if present.
 	// This can then also be used by the build system to properly check whether
 	// a package is present in an arch-repo.
 	else {
-		full_path = os.join_path(app.repo.repos_dir, repo, arch, filename, 'desc')
+		full_path = os.join_path(app.repo.repos_dir, repo_, arch, filename, 'desc')
 	}
 
 	return app.file(full_path)
@@ -49,10 +49,10 @@ fn (mut app App) get_repo_file(repo string, arch string, filename string) web.Re
 
 // put_package handles publishing a package to a repository.
 ['/:repo/publish'; auth; markused; post]
-fn (mut app App) put_package(repo string) web.Result {
+fn (mut app App) put_package(repo_ string) web.Result {
 	// api is a reserved keyword for api routes & should never be allowed to be
 	// a repository.
-	if repo.to_lower() == 'api' {
+	if repo_.to_lower() == 'api' {
 		return app.json(.bad_request, new_response("'api' is a reserved keyword & cannot be used as a repository name."))
 	}
 
@@ -62,19 +62,19 @@ fn (mut app App) put_package(repo string) web.Result {
 		// Generate a random filename for the temp file
 		pkg_path = os.join_path_single(app.repo.pkg_dir, rand.uuid_v4())
 
-		app.ldebug("Uploading $length bytes (${util.pretty_bytes(length.int())}) to '$pkg_path'.")
+		app.ldebug("Uploading ${length} bytes (${util.pretty_bytes(length.int())}) to '${pkg_path}'.")
 
 		// This is used to time how long it takes to upload a file
 		mut sw := time.new_stopwatch(time.StopWatchOptions{ auto_start: true })
 
 		util.reader_to_file(mut app.reader, length.int(), pkg_path) or {
-			app.lwarn("Failed to upload '$pkg_path'")
+			app.lwarn("Failed to upload '${pkg_path}': ${err.msg()}")
 
 			return app.status(.internal_server_error)
 		}
 
 		sw.stop()
-		app.ldebug("Upload of '$pkg_path' completed in ${sw.elapsed().seconds():.3}s.")
+		app.ldebug("Upload of '${pkg_path}' completed in ${sw.elapsed().seconds():.3}s.")
 	} else {
 		app.lwarn('Tried to upload package without specifying a Content-Length.')
 
@@ -82,15 +82,15 @@ fn (mut app App) put_package(repo string) web.Result {
 		return app.status(.length_required)
 	}
 
-	res := app.repo.add_pkg_from_path(repo, pkg_path) or {
-		app.lerror('Error while adding package: $err.msg()')
+	res := app.repo.add_pkg_from_path(repo_, pkg_path) or {
+		app.lerror('Error while adding package: ${err.msg()}')
 
-		os.rm(pkg_path) or { app.lerror("Failed to remove download '$pkg_path': $err.msg()") }
+		os.rm(pkg_path) or { app.lerror("Failed to remove download '${pkg_path}': ${err.msg()}") }
 
 		return app.status(.internal_server_error)
 	}
 
-	app.linfo("Added '$res.name-$res.version' to '$repo (${res.archs.join(',')})'.")
+	app.linfo("Added '${res.name}-${res.version}' to '${repo_} (${res.archs.join(',')})'.")
 
 	return app.json(.ok, new_data_response(res))
 }

src/server/repo_remove.v

@@ -6,17 +6,17 @@ import web
 ['/:repo/:arch/:pkg'; auth; delete; markused]
 fn (mut app App) delete_package(repo string, arch string, pkg string) web.Result {
 	res := app.repo.remove_pkg_from_arch_repo(repo, arch, pkg, true) or {
-		app.lerror('Error while deleting package: $err.msg()')
+		app.lerror('Error while deleting package: ${err.msg()}')
 
 		return app.status(.internal_server_error)
 	}
 
 	if res {
-		app.linfo("Removed package '$pkg' from '$repo/$arch'")
+		app.linfo("Removed package '${pkg}' from '${repo}/${arch}'")
 
 		return app.status(.ok)
 	} else {
-		app.linfo("Tried removing package '$pkg' from '$repo/$arch', but it doesn't exist.")
+		app.linfo("Tried removing package '${pkg}' from '${repo}/${arch}', but it doesn't exist.")
 
 		return app.status(.not_found)
 	}
@@ -26,17 +26,17 @@ fn (mut app App) delete_package(repo string, arch string, pkg string) web.Result
 ['/:repo/:arch'; auth; delete; markused]
 fn (mut app App) delete_arch_repo(repo string, arch string) web.Result {
 	res := app.repo.remove_arch_repo(repo, arch) or {
-		app.lerror('Error while deleting arch-repo: $err.msg()')
+		app.lerror('Error while deleting arch-repo: ${err.msg()}')
 
 		return app.status(.internal_server_error)
 	}
 
 	if res {
-		app.linfo("Removed arch-repo '$repo/$arch'")
+		app.linfo("Removed arch-repo '${repo}/${arch}'")
 
 		return app.status(.ok)
 	} else {
-		app.linfo("Tried removing '$repo/$arch', but it doesn't exist.")
+		app.linfo("Tried removing '${repo}/${arch}', but it doesn't exist.")
 
 		return app.status(.not_found)
 	}
@@ -46,17 +46,17 @@ fn (mut app App) delete_arch_repo(repo string, arch string) web.Result {
 ['/:repo'; auth; delete; markused]
 fn (mut app App) delete_repo(repo string) web.Result {
 	res := app.repo.remove_repo(repo) or {
-		app.lerror('Error while deleting repo: $err.msg()')
+		app.lerror('Error while deleting repo: ${err.msg()}')
 
 		return app.status(.internal_server_error)
 	}
 
 	if res {
-		app.linfo("Removed repo '$repo'")
+		app.linfo("Removed repo '${repo}'")
 
 		return app.status(.ok)
 	} else {
-		app.linfo("Tried removing '$repo', but it doesn't exist.")
+		app.linfo("Tried removing '${repo}', but it doesn't exist.")
 
 		return app.status(.not_found)
 	}

src/server/server.v

@@ -5,9 +5,10 @@ import os
 import log
 import repo
 import util
-import db
+import dbms
 import build { BuildJobQueue }
-import cron.expression
+import cron
+import metrics
 
 const (
 	log_file_name = 'vieter.log'
@@ -24,24 +25,15 @@ pub mut:
 	repo repo.RepoGroupManager [required; web_global]
 	// Keys are the various architectures for packages
 	job_queue BuildJobQueue [required; web_global]
-	db        db.VieterDb
+	db        dbms.VieterDb
 }
 
 // init_job_queue populates a fresh job queue with all the targets currently
 // stored in the database.
 fn (mut app App) init_job_queue() ! {
-	// Initialize build queues
-	mut targets := app.db.get_targets(limit: 25)
-	mut i := u64(0)
-
-	for targets.len > 0 {
-		for target in targets {
+	for target in app.db.targets(limit: 0) {
 		app.job_queue.insert_all(target)!
 	}
-
-		i += 25
-		targets = app.db.get_targets(limit: 25, offset: i)
-	}
 }
 
 // server starts the web server & starts listening for requests
@@ -51,12 +43,12 @@ pub fn server(conf Config) ! {
 		util.exit_with_message(1, "'any' is not allowed as the value for default_arch.")
 	}
 
-	global_ce := expression.parse_expression(conf.global_schedule) or {
-		util.exit_with_message(1, 'Invalid global cron expression: $err.msg()')
+	global_ce := cron.parse_expression(conf.global_schedule) or {
+		util.exit_with_message(1, 'Invalid global cron expression: ${err.msg()}')
 	}
 
-	log_removal_ce := expression.parse_expression(conf.log_removal_schedule) or {
-		util.exit_with_message(1, 'Invalid log removal cron expression: $err.msg()')
+	log_removal_ce := cron.parse_expression(conf.log_removal_schedule) or {
+		util.exit_with_message(1, 'Invalid log removal cron expression: ${err.msg()}')
 	}
 
 	// Configure logger
@@ -90,30 +82,40 @@ pub fn server(conf Config) ! {
 
 	repo_dir := os.join_path_single(conf.data_dir, server.repo_dir_name)
 	// This also creates the directories if needed
-	repo := repo.new(repo_dir, conf.pkg_dir, conf.default_arch) or {
+	repo_ := repo.new(repo_dir, conf.pkg_dir, conf.default_arch) or {
 		logger.error(err.msg())
 		exit(1)
 	}
 
 	db_file := os.join_path_single(conf.data_dir, server.db_file_name)
-	db := db.init(db_file) or {
-		util.exit_with_message(1, 'Failed to initialize database: $err.msg()')
+	db := dbms.init(db_file) or {
+		util.exit_with_message(1, 'Failed to initialize database: ${err.msg()}')
 	}
 
+	mut collector := if conf.collect_metrics {
+		&metrics.MetricsCollector(metrics.new_default_collector())
+	} else {
+		&metrics.MetricsCollector(metrics.new_null_collector())
+	}
+
+	collector.histogram_buckets_set('http_requests_duration_seconds', [0.001, 0.005, 0.01, 0.05,
+		0.1, 0.5, 1, 5, 10])
+
 	mut app := &App{
 		logger: logger
 		api_key: conf.api_key
 		conf: conf
-		repo: repo
+		repo: repo_
 		db: db
-		job_queue: build.new_job_queue(global_ce, conf.base_image)
+		collector: collector
+		job_queue: build.new_job_queue(global_ce, conf.base_image, conf.default_build_timeout)
 	}
 	app.init_job_queue() or {
-		util.exit_with_message(1, 'Failed to inialize job queue: $err.msg()')
+		util.exit_with_message(1, 'Failed to inialize job queue: ${err.msg()}')
 	}
 
 	if conf.max_log_age > 0 {
-		go app.log_removal_daemon(log_removal_ce)
+		spawn app.log_removal_daemon(log_removal_ce)
 	}
 
 	web.run(app, conf.port)

src/util/stream.v

@@ -46,12 +46,16 @@ pub fn reader_to_file(mut reader io.BufferedReader, length int, path string) ! {
 			to_write = to_write - bytes_written
 		}
 	}
+
+	if bytes_left > 0 {
+		return error('Not all bytes were received.')
+	}
 }
 
-// match_array_in_array<T> returns how many elements of a2 overlap with a1. For
+// match_array_in_array[T] returns how many elements of a2 overlap with a1. For
 // example, if a1 = "abcd" & a2 = "cd", the result will be 2. If the match is
 // not at the end of a1, the result is 0.
-pub fn match_array_in_array<T>(a1 []T, a2 []T) int {
+pub fn match_array_in_array[T](a1 []T, a2 []T) int {
 	mut i := 0
 	mut match_len := 0
 

src/v.mod

@@ -2,6 +2,7 @@ Module {
     dependencies: [
         'https://git.rustybever.be/vieter-v/conf',
         'https://git.rustybever.be/vieter-v/docker',
-        'https://git.rustybever.be/vieter-v/aur'
+        'https://git.rustybever.be/vieter-v/aur',
+        'https://git.rustybever.be/vieter-v/metrics'
     ]
 }

src/web/logging.v

@@ -1,35 +1,36 @@
 module web
 
-import log
-
-// log reate a log message with the given level
-pub fn (mut ctx Context) log(msg string, level log.Level) {
-	lock ctx.logger {
-		ctx.logger.send_output(msg, level)
-	}
-}
-
 // lfatal create a log message with the fatal level
 pub fn (mut ctx Context) lfatal(msg string) {
-	ctx.log(msg, log.Level.fatal)
+	lock ctx.logger {
+		ctx.logger.fatal(msg)
+	}
 }
 
 // lerror create a log message with the error level
 pub fn (mut ctx Context) lerror(msg string) {
-	ctx.log(msg, log.Level.error)
+	lock ctx.logger {
+		ctx.logger.error(msg)
+	}
 }
 
 // lwarn create a log message with the warn level
 pub fn (mut ctx Context) lwarn(msg string) {
-	ctx.log(msg, log.Level.warn)
+	lock ctx.logger {
+		ctx.logger.warn(msg)
+	}
 }
 
 // linfo create a log message with the info level
 pub fn (mut ctx Context) linfo(msg string) {
-	ctx.log(msg, log.Level.info)
+	lock ctx.logger {
+		ctx.logger.info(msg)
+	}
 }
 
 // ldebug create a log message with the debug level
 pub fn (mut ctx Context) ldebug(msg string) {
-	ctx.log(msg, log.Level.debug)
+	lock ctx.logger {
+		ctx.logger.debug(msg)
+	}
 }

src/web/parse.v

@@ -10,7 +10,7 @@ const attrs_to_ignore = ['auth', 'markused']
 // Parsing function attributes for methods and path.
 fn parse_attrs(name string, attrs []string) !([]http.Method, string) {
 	if attrs.len == 0 {
-		return [http.Method.get], '/$name'
+		return [http.Method.get], '/${name}'
 	}
 
 	mut x := attrs.clone()
@@ -45,7 +45,7 @@ fn parse_attrs(name string, attrs []string) !([]http.Method, string) {
 		methods = [http.Method.get]
 	}
 	if path == '' {
-		path = '/$name'
+		path = '/${name}'
 	}
 	// Make path lowercase for case-insensitive comparisons
 	return methods, path.to_lower()

src/web/response/response.v

@@ -1,6 +1,6 @@
 module response
 
-pub struct Response<T> {
+pub struct Response[T] {
 pub:
 	message string
 	data    T
@@ -8,26 +8,26 @@ pub:
 
 // new_response constructs a new Response<String> object with the given message
 // & an empty data field.
-pub fn new_response(message string) Response<string> {
-	return Response<string>{
+pub fn new_response(message string) Response[string] {
+	return Response[string]{
 		message: message
 		data: ''
 	}
 }
 
-// new_data_response<T> constructs a new Response<T> object with the given data
+// new_data_response[T] constructs a new Response<T> object with the given data
 // & an empty message field.
-pub fn new_data_response<T>(data T) Response<T> {
-	return Response<T>{
+pub fn new_data_response[T](data T) Response[T] {
+	return Response[T]{
 		message: ''
 		data: data
 	}
 }
 
-// new_full_response<T> constructs a new Response<T> object with the given
+// new_full_response[T] constructs a new Response<T> object with the given
 // message & data.
-pub fn new_full_response<T>(message string, data T) Response<T> {
-	return Response<T>{
+pub fn new_full_response[T](message string, data T) Response[T] {
+	return Response[T]{
 		message: message
 		data: data
 	}

src/web/web.v

@@ -11,6 +11,7 @@ import net.urllib
 import time
 import json
 import log
+import metrics
 
 // The Context struct represents the Context which hold the HTTP request and response.
 // It has fields for the query, form, files.
@@ -27,6 +28,8 @@ pub mut:
 	conn &net.TcpConn = unsafe { nil }
 	// Gives access to a shared logger object
 	logger shared log.Log
+	// Used to collect metrics on the web server
+	collector &metrics.MetricsCollector
 	// time.ticks() from start of web connection handle.
 	// You can use it to determine how much time is spent on your request.
 	page_gen_start i64
@@ -41,7 +44,7 @@ pub mut:
 	// Files from multipart-form.
 	files map[string][]http.FileData
 	// Allows reading the request body
-	reader io.BufferedReader
+	reader &io.BufferedReader = unsafe { nil }
 	// RESPONSE
 	status       http.Status = http.Status.ok
 	content_type string      = 'text/plain'
@@ -145,8 +148,17 @@ pub fn (ctx &Context) is_authenticated() bool {
 	return false
 }
 
-// json<T> HTTP_OK with json_s as payload with content-type `application/json`
-pub fn (mut ctx Context) json<T>(status http.Status, j T) Result {
+// body sends the given body as an HTTP response.
+pub fn (mut ctx Context) body(status http.Status, content_type string, body string) Result {
+	ctx.status = status
+	ctx.content_type = content_type
+	ctx.send_response(body)
+
+	return Result{}
+}
+
+// json[T] HTTP_OK with json_s as payload with content-type `application/json`
+pub fn (mut ctx Context) json[T](status http.Status, j T) Result {
 	ctx.status = status
 	ctx.content_type = 'application/json'
 
@@ -266,14 +278,14 @@ interface DbInterface {
 
 // run runs the app
 [manualfree]
-pub fn run<T>(global_app &T, port int) {
-	mut l := net.listen_tcp(.ip6, ':$port') or { panic('failed to listen $err.code() $err') }
+pub fn run[T](global_app &T, port int) {
+	mut l := net.listen_tcp(.ip6, ':${port}') or { panic('failed to listen ${err.code()} ${err}') }
 
 	// Parsing methods attributes
 	mut routes := map[string]Route{}
 	$for method in T.methods {
 		http_methods, route_path := parse_attrs(method.name, method.attrs) or {
-			eprintln('error parsing method attributes: $err')
+			eprintln('error parsing method attributes: ${err}')
 			return
 		}
 
@@ -282,7 +294,7 @@ pub fn run<T>(global_app &T, port int) {
 			path: route_path
 		}
 	}
-	println('[Vweb] Running app on http://localhost:$port')
+	println('[Vweb] Running app on http://localhost:${port}')
 	for {
 		// Create a new app object for each connection, copy global data like db connections
 		mut request_app := &T{}
@@ -299,16 +311,16 @@ pub fn run<T>(global_app &T, port int) {
 		request_app.Context = global_app.Context // copy the context ref that contains static files map etc
 		mut conn := l.accept() or {
 			// failures should not panic
-			eprintln('accept() failed with error: $err.msg()')
+			eprintln('accept() failed with error: ${err.msg()}')
 			continue
 		}
-		go handle_conn<T>(mut conn, mut request_app, routes)
+		spawn handle_conn[T](mut conn, mut request_app, routes)
 	}
 }
 
 // handle_conn handles a connection
 [manualfree]
-fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
+fn handle_conn[T](mut conn net.TcpConn, mut app T, routes map[string]Route) {
 	conn.set_read_timeout(30 * time.second)
 	conn.set_write_timeout(30 * time.second)
 
@@ -319,6 +331,23 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 			app.logger.flush()
 		}
 
+		// Record how long request took to process
+		path := urllib.parse(app.req.url) or { urllib.URL{} }.path
+		labels := [
+			['method', app.req.method.str()]!,
+			['path', path]!,
+			// Not all methods properly set this value yet I think
+			['status', app.status.int().str()]!,
+		]
+		app.collector.counter_increment(name: 'http_requests_total', labels: labels)
+		// Prometheus prefers metrics containing base units, as defined here
+		// https://prometheus.io/docs/practices/naming/
+		app.collector.histogram_record(f64(time.ticks() - app.page_gen_start) / 1000,
+			
+			name: 'http_requests_duration_seconds'
+			labels: labels
+		)
+
 		unsafe {
 			free(app)
 		}
@@ -334,8 +363,8 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 	// Request parse
 	head := http.parse_request_head(mut reader) or {
 		// Prevents errors from being thrown when BufferedReader is empty
-		if '$err' != 'none' {
-			eprintln('error parsing request head: $err')
+		if '${err}' != 'none' {
+			eprintln('error parsing request head: ${err}')
 		}
 		return
 	}
@@ -343,7 +372,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 	// The healthcheck spams the logs, which isn't very useful
 	if head.url != '/health' {
 		lock app.logger {
-			app.logger.debug('$head.method $head.url $head.version')
+			app.logger.debug('${head.method} ${head.url} ${head.version}')
 		}
 	}
 
@@ -357,7 +386,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 
 	// URL Parse
 	url := urllib.parse(head.url) or {
-		eprintln('error parsing path: $err')
+		eprintln('error parsing path: ${err}')
 		return
 	}
 
@@ -384,6 +413,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 		static_mime_types: app.static_mime_types
 		reader: reader
 		logger: app.logger
+		collector: app.collector
 		api_key: app.api_key
 	}
 
@@ -394,7 +424,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 	$for method in T.methods {
 		$if method.return_type is Result {
 			route := routes[method.name] or {
-				eprintln('parsed attributes for the `$method.name` are not found, skipping...')
+				eprintln('parsed attributes for the `${method.name}` are not found, skipping...')
 				Route{}
 			}
 
@@ -426,7 +456,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T, routes map[string]Route) {
 
 					method_args := params.clone()
 					if method_args.len != method.args.len {
-						eprintln('warning: uneven parameters count ($method.args.len) in `$method.name`, compared to the web route `$method.attrs` ($method_args.len)')
+						eprintln('warning: uneven parameters count (${method.args.len}) in `${method.name}`, compared to the web route `${method.attrs}` (${method_args.len})')
 					}
 					app.$method(method_args)
 					return

vieter.toml

@@ -12,4 +12,6 @@ address = "http://localhost:8000"
 api_update_frequency = 2
 image_rebuild_frequency = 1
 max_concurrent_builds = 3
-max_log_age = 64
+# max_log_age = 64
+log_removal_schedule = '* * *'
+collect_metrics = true