daemon: worked on daemon loop

BREAKING: the V compiler removed the byte type alias in favor of u8.

.gitignore

@@ -5,8 +5,8 @@ data/
 vieter
 dvieter
 pvieter
-dvieterctl
-vieterctl
+suvieter
+afvieter
 vieter.c
 
 # Ignore testing files
@@ -23,3 +23,6 @@ v/
 
 # gdb log file
 gdb.txt
+
+# Generated docs
+_docs/

.woodpecker/.arch.yml

@@ -10,6 +10,8 @@ pipeline:
   build:
     image: 'menci/archlinuxarm:base-devel'
     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
       # Update packages
       - pacman -Syu --noconfirm
       # Create non-root user to perform build & switch to their home

.woodpecker/.build.yml

@@ -9,22 +9,21 @@ matrix:
 platform: ${PLATFORM}
 
 pipeline:
-  # The default build isn't needed, as alpine switches to gcc for the compiler anyways
   debug:
     image: 'chewingbever/vlang:latest'
     pull: true
-    group: 'build'
     commands:
-      - make debug
+      - make
     when:
       event: push
+      branch:
+        exclude: [main, dev]
 
   prod:
     image: 'chewingbever/vlang:latest'
     pull: true
     environment:
       - LDFLAGS=-lz -lbz2 -llzma -lexpat -lzstd -llz4 -static
-    group: 'build'
     commands:
       - make prod
       # Make sure the binary is actually statically built

.woodpecker/.build_experimental.yml

@@ -27,16 +27,3 @@ pipeline:
       - du -h suvieter
     when:
       event: push
-
-  skip-unused-static:
-    image: 'chewingbever/vlang:latest'
-    pull: true
-    environment:
-      - LDFLAGS=-lz -lbz2 -llzma -lexpat -lzstd -llz4 -static
-    group: 'build'
-    commands:
-      - make skip-unused
-      - readelf -d suvieter
-      - du -h suvieter
-    when:
-      event: push

Makefile

@@ -3,13 +3,14 @@ SRC_DIR := src
 SOURCES != find '$(SRC_DIR)' -iname '*.v'
 
 V_PATH ?= v
-V := $(V_PATH) -showcc -gc boehm
+V := $(V_PATH) -showcc -gc boehm -d dynamic_boehm
 
 all: vieter
 
 
 # =====COMPILATION=====
-# Regular binary
+# We force the boehm gc to be compiled dynamically because otherwise, our CI
+# build breaks.
 vieter: $(SOURCES)
 	$(V) -g -o vieter $(SRC_DIR)
 
@@ -24,7 +25,7 @@ dvieter: $(SOURCES)
 # Run the debug build inside gdb
 .PHONY: gdb
 gdb: dvieter
-		gdb --args './dvieter -f vieter.toml server'
+		gdb --args ./dvieter -f vieter.toml server
 
 # Optimised production build
 .PHONY: prod
@@ -74,8 +75,14 @@ v/v:
 	git clone --single-branch https://git.rustybever.be/Chewing_Bever/v v
 	make -C v
 
+.PHONY: clean
 clean:
-	rm -rf 'data' 'vieter' 'dvieter' 'pvieter' 'vieter.c' 'dvieterctl' 'vieterctl' 'pkg' 'src/vieter' *.pkg.tar.zst
+	rm -rf 'data' 'vieter' 'dvieter' 'pvieter' 'vieter.c' 'dvieterctl' 'vieterctl' 'pkg' 'src/vieter' *.pkg.tar.zst 'suvieter' 'afvieter' '$(SRC_DIR)/_docs'
+
+.PHONY: docs
+docs:
+	rm -rf '$(SRC_DIR)/_docs'
+	cd '$(SRC_DIR)' && v doc -all -f html -m -readme .
 
 
 # =====EXPERIMENTAL=====

PKGBUILD

@@ -2,10 +2,10 @@
 
 pkgbase='vieter'
 pkgname='vieter'
-pkgver=0.2.0.r24.g9a56bd0
+pkgver=0.2.0.r25.g20112b8
 pkgrel=1
 depends=('glibc' 'openssl' 'libarchive' 'gc')
-makedepends=('git' 'gcc')
+makedepends=('git' 'gcc' 'vieter-v')
 arch=('x86_64' 'aarch64' 'armv7')
 url='https://git.rustybever.be/Chewing_Bever/vieter'
 license=('AGPL3')
@@ -20,10 +20,7 @@ pkgver() {
 build() {
     cd "$pkgname"
 
-    # Build the compiler
-    CFLAGS= make v
-
-    V_PATH=v/v make prod
+    make prod
 }
 
 package() {

README.md

@@ -2,7 +2,9 @@
 
 ## Documentation
 
-I host documentation for Vieter over at https://rustybever.be/docs/vieter/.
+I host documentation for Vieter over at https://rustybever.be/docs/vieter/. API
+documentation for the current codebase can be found at
+https://rustybever.be/api-docs/vieter/.
 
 ## Overview
 

src/cron/cli.v

@@ -11,8 +11,9 @@ pub:
 	address               string
 	base_image            string = 'archlinux:base-devel'
 	max_concurrent_builds int    = 1
-	api_update_frequency  int    = 60
-	global_schedule       string
+	api_update_frequency  int    = 15
+	// Replicates the behavior of the original cron system
+	global_schedule string = '0 3'
 }
 
 // cmd returns the cli module that handles the cron daemon.

src/cron/daemon/build.v

@@ -1,9 +1,27 @@
 module daemon
 
-import git
 import time
 import sync.stdatomic
 
+const build_empty = 0
+
+const build_running = 1
+
+const build_done = 2
+
+// reschedule_builds looks for any builds with status code 2 & re-adds them to
+// the queue.
+fn (mut d Daemon) reschedule_builds() ? {
+	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)
+			sb := d.builds[i]
+
+			d.schedule_build(sb.repo_id, sb.repo) ?
+		}
+	}
+}
+
 // update_builds starts as many builds as possible.
 fn (mut d Daemon) update_builds() ? {
 	now := time.now()
@@ -13,7 +31,8 @@ fn (mut d Daemon) update_builds() ? {
 			sb := d.queue.pop() ?
 
 			// If this build couldn't be scheduled, no more will be possible.
-			if !d.start_build(sb.repo_id)? {
+			// TODO a build that couldn't be scheduled should be re-added to the queue.
+			if !d.start_build(sb) {
 				break
 			}
 		} else {
@@ -22,13 +41,14 @@ fn (mut d Daemon) update_builds() ? {
 	}
 }
 
-// start_build starts a build for the given repo_id.
-fn (mut d Daemon) start_build(repo_id string) ?bool {
+// 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]) == 0 {
-			stdatomic.store_u64(&d.atomics[i], 1)
+		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, d.repos_map[repo_id])
+			go d.run_build(i, sb)
 
 			return true
 		}
@@ -37,9 +57,10 @@ fn (mut d Daemon) start_build(repo_id string) ?bool {
 	return false
 }
 
-fn (mut d Daemon) run_build(build_index int, repo git.GitRepo) ? {
+// run_build actually starts the build process for a given repo.
+fn (mut d Daemon) run_build(build_index int, sb ScheduledBuild) ? {
+	d.linfo('build $sb.repo.url')
 	time.sleep(10 * time.second)
 
-	stdatomic.store_u64(&d.atomics[build_index], 2)
+	stdatomic.store_u64(&d.atomics[build_index], daemon.build_done)
 }
-

src/cron/daemon/daemon.v

@@ -5,6 +5,8 @@ import time
 import log
 import datatypes { MinHeap }
 import cron.expression { CronExpression, parse_expression }
+import math
+import arrays
 
 struct ScheduledBuild {
 pub:
@@ -30,7 +32,7 @@ mut:
 	api_update_timestamp time.Time
 	queue                MinHeap<ScheduledBuild>
 	// Which builds are currently running
-	builds []git.GitRepo
+	builds []ScheduledBuild
 	// Atomic variables used to detect when a build has finished; length is the
 	// same as builds
 	atomics []u64
@@ -47,7 +49,7 @@ pub fn init_daemon(logger log.Log, address string, api_key string, base_image st
 		global_schedule: global_schedule
 		api_update_frequency: api_update_frequency
 		atomics: []u64{len: max_concurrent_builds}
-		builds: []git.GitRepo{len: max_concurrent_builds}
+		builds: []ScheduledBuild{len: max_concurrent_builds}
 		logger: logger
 	}
 
@@ -62,15 +64,63 @@ pub fn init_daemon(logger log.Log, address string, api_key string, base_image st
 // periodically refreshes the list of repositories to ensure we stay in sync.
 pub fn (mut d Daemon) run() ? {
 	for {
-		d.update_builds() ?
-		println(d.queue)
-		println(d.atomics)
-
-		time.sleep(60 * time.second)
+		// Update the API's contents if needed & renew the queue
+		if time.now() >= d.api_update_timestamp {
+			d.renew_repos() ?
+			d.renew_queue() ?
 		}
+
+		// Cleans up finished builds, opening up spots for new builds
+		d.reschedule_builds() ?
+
+		// TODO rebuild builder image when needed
+
+		// Schedules new builds when possible
+		d.update_builds() ?
+
+		// Sleep either until we have to refresh the repos or when the next
+		// build has to start, with a minimum of 1 second.
+		now := time.now()
+
+		mut delay := d.api_update_timestamp - now
+
+		if d.queue.len() > 0 {
+			time_until_next_job := d.queue.peek() ?.timestamp - now
+
+			delay = math.min(delay, time_until_next_job)
+		}
+
+		d.ldebug('Sleeping for ${delay}...')
+
+		// TODO if there are builds active, the sleep time should be much lower to clean up the builds when they're finished.
+
+		// We sleep for at least one second. This is to prevent the program
+		// from looping agressively when a cronjob can be scheduled, but
+		// there's no spots free for it to be started.
+		time.sleep(math.max(delay, 1 * time.second))
+	}
+}
+
+// schedule_build adds the next occurence of the given repo build to the queue.
+fn (mut d Daemon) schedule_build(repo_id string, repo git.GitRepo) ? {
+	ce := parse_expression(repo.schedule) or {
+		// TODO This shouldn't return an error if the expression is empty.
+		d.lerror("Error while parsing cron expression '$repo.schedule' ($repo_id): $err.msg()")
+
+		d.global_schedule
+	}
+	// A repo that can't be scheduled will just be skipped for now
+	timestamp := ce.next_from_now() ?
+
+	d.queue.insert(ScheduledBuild{
+		repo_id: repo_id
+		repo: repo
+		timestamp: timestamp
+	})
 }
 
 fn (mut d Daemon) renew_repos() ? {
+	d.ldebug('Renewing repos...')
 	mut new_repos := git.get_repos(d.address, d.api_key) ?
 
 	d.repos_map = new_repos.move()
@@ -81,6 +131,7 @@ fn (mut d Daemon) renew_repos() ? {
 // renew_queue replaces the old queue with a new one that reflects the newest
 // values in repos_map.
 fn (mut d Daemon) renew_queue() ? {
+	d.ldebug('Renewing queue...')
 	mut new_queue := MinHeap<ScheduledBuild>{}
 
 	// Move any jobs that should have already started from the old queue onto
@@ -101,19 +152,11 @@ fn (mut d Daemon) renew_queue() ? {
 		}
 	}
 
+	d.queue = new_queue
+
 	// For each repository in repos_map, parse their cron expression (or use
 	// the default one if not present) & add them to the queue
 	for id, repo in d.repos_map {
-		ce := parse_expression(repo.schedule) or { d.global_schedule }
-		// A repo that can't be scheduled will just be skipped for now
-		timestamp := ce.next(now) or { continue }
-
-		new_queue.insert(ScheduledBuild{
-			repo_id: id
-			repo: repo
-			timestamp: timestamp
-		})
+		d.schedule_build(id, repo) ?
 	}
-
-	d.queue = new_queue
 }

src/cron/expression/expression.v

@@ -114,7 +114,7 @@ pub fn (ce &CronExpression) next(ref time.Time) ?time.Time {
 	})
 }
 
-fn (ce &CronExpression) next_from_now() ?time.Time {
+pub fn (ce &CronExpression) next_from_now() ?time.Time {
 	return ce.next(time.now())
 }
 

src/docker/docker.v

@@ -28,8 +28,8 @@ fn send(req &string) ?http.Response {
 	s.wait_for_write() ?
 
 	mut c := 0
-	mut buf := []byte{len: docker.buf_len}
-	mut res := []byte{}
+	mut buf := []u8{len: docker.buf_len}
+	mut res := []u8{}
 
 	for {
 		c = s.read(mut buf) or { return error('Failed to read data from socket ${docker.socket}.') }
@@ -52,7 +52,7 @@ fn send(req &string) ?http.Response {
 
 	// We loop until we've encountered the end of the chunked response
 	// A chunked HTTP response always ends with '0\r\n\r\n'.
-	for res.len < 5 || res#[-5..] != [byte(`0`), `\r`, `\n`, `\r`, `\n`] {
+	for res.len < 5 || res#[-5..] != [u8(`0`), `\r`, `\n`, `\r`, `\n`] {
 		// Wait for the server to respond
 		s.wait_for_write() ?
 

src/repo/sync.v

@@ -19,7 +19,7 @@ fn archive_add_entry(archive &C.archive, entry &C.archive_entry, file_path &stri
 	}
 
 	// Write the file to the archive
-	buf := [8192]byte{}
+	buf := [8192]u8{}
 	mut len := C.read(fd, &buf, sizeof(buf))
 
 	for len > 0 {

src/util/util.v

@@ -30,7 +30,7 @@ pub fn reader_to_file(mut reader io.BufferedReader, length int, path string) ? {
 		file.close()
 	}
 
-	mut buf := []byte{len: util.reader_buf_size}
+	mut buf := []u8{len: util.reader_buf_size}
 	mut bytes_left := length
 
 	// Repeat as long as the stream still has data
@@ -60,7 +60,7 @@ pub fn hash_file(path &string) ?(string, string) {
 	mut sha256sum := sha256.new()
 
 	buf_size := int(1_000_000)
-	mut buf := []byte{len: buf_size}
+	mut buf := []u8{len: buf_size}
 	mut bytes_left := os.file_size(path)
 
 	for bytes_left > 0 {

src/web/web.v

@@ -285,7 +285,7 @@ pub fn (mut ctx Context) file(f_path string) Result {
 	resp.set_status(ctx.status)
 	send_string(mut ctx.conn, resp.bytestr()) or { return Result{} }
 
-	mut buf := []byte{len: 1_000_000}
+	mut buf := []u8{len: 1_000_000}
 	mut bytes_left := file_size
 
 	// Repeat as long as the stream still has data