Attempt at writing renew_queue function; seems to just stop in the

middle

src/cron/cron.v

@@ -5,12 +5,13 @@ import time
 import log
 import util
 import cron.daemon
+import cron.expression
 
 // 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 {
-		util.exit_with_message(1, 'Invalid log level. The allowed values are FATAL, ERROR, WARN, INFO & DEBUG.')
+		return error('Invalid log level. The allowed values are FATAL, ERROR, WARN, INFO & DEBUG.')
 	}
 
 	mut logger := log.Log{
@@ -20,5 +21,12 @@ pub fn cron(conf Config) ? {
 	logger.set_full_logpath(conf.log_file)
 	logger.log_to_console_too()
 
-	d := daemon.init(conf)
+	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) ?
+
+	d.run() ?
 }

src/cron/daemon/daemon.v

@@ -3,9 +3,12 @@ module daemon
 import git
 import time
 import log
-import datatypes
+import datatypes { MinHeap }
+import cron.expression { CronExpression, parse_expression }
 
 struct ScheduledBuild {
+pub:
+	repo_id   string
 	repo      git.GitRepo
 	timestamp time.Time
 }
@@ -16,12 +19,16 @@ fn (r1 ScheduledBuild) < (r2 ScheduledBuild) bool {
 
 pub struct Daemon {
 mut:
-	conf Config
+	address              string
+	api_key              string
+	base_image           string
+	global_schedule      CronExpression
+	api_update_frequency int
 	// Repos currently loaded from API.
 	repos_map map[string]git.GitRepo
 	// At what point to update the list of repositories.
 	api_update_timestamp time.Time
-	queue datatypes.MinHeap<ScheduledBuild>
+	queue                MinHeap<ScheduledBuild>
 	// Which builds are currently running
 	builds []git.GitRepo
 	// Atomic variables used to detect when a build has finished; length is the
@@ -30,25 +37,66 @@ mut:
 	logger  shared log.Log
 }
 
-// init 
-pub fn init(conf Config) Daemon {
-	return Daemon{
-		conf: conf
-		atomics: [conf.max_concurrent_builds]u64{}
-	}
+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) ?Daemon {
+	mut d := Daemon{
+		address: address
+		api_key: api_key
+		base_image: base_image
+		global_schedule: global_schedule
+		api_update_frequency: api_update_frequency
+		atomics: []u64{len: max_concurrent_builds}
+		builds: []git.GitRepo{len: max_concurrent_builds}
+		logger: logger
 	}
 
-fn (mut d Daemon) run() ? {
+	// Initialize the repos & queue
 	d.renew_repos() ?
 	d.renew_queue() ?
+
+	return d
+}
+
+pub fn (mut d Daemon) run() ? {
+	println(d.queue)
 }
 
 fn (mut d Daemon) renew_repos() ? {
-	mut new_repos := git.get_repos(d.conf.address, d.conf.api_key) ?
+	mut new_repos := git.get_repos(d.address, d.api_key) ?
 
 	d.repos_map = new_repos.move()
+
+	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 repos_map.
 fn (mut d Daemon) renew_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 d.queue.len() > 0 && d.queue.peek() ?.timestamp < now {
+		new_queue.insert(d.queue.pop() ?)
+	}
+
+	println('hey')
+	println(d.repos_map)
+	// 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 {
+		println('hey')
+		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.queue = new_queue
 }

src/cron/expression/expression.v

@@ -1,8 +1,8 @@
-module cron
+module expression
 
 import time
 
-struct CronExpression {
+pub struct CronExpression {
 	minutes []int
 	hours   []int
 	days    []int
@@ -219,7 +219,7 @@ fn parse_part(s string, min int, max int) ?[]int {
 
 // parse_expression parses an entire cron expression string into a
 // CronExpression object, if possible.
-fn parse_expression(exp string) ?CronExpression {
+pub fn parse_expression(exp string) ?CronExpression {
 	// The filter allows for multiple spaces between parts
 	mut parts := exp.split(' ').filter(it != '')
 

src/cron/expression/expression_parse_test.v

@@ -1,4 +1,4 @@
-module cron
+module expression
 
 // parse_range_error returns the returned error message. If the result is '',
 // that means the function didn't error.

src/cron/expression/expression_test.v

@@ -1,4 +1,4 @@
-module cron
+module expression
 
 import time { parse }
 

src/git/git.v

@@ -15,7 +15,7 @@ pub mut:
 	// Which repo the builder should publish packages to
 	repo string
 	// Cron schedule describing how frequently to build the repo.
-	schedule string
+	schedule string [optional]
 }
 
 // patch_from_params patches a GitRepo from a map[string]string, usually
@@ -74,7 +74,7 @@ pub fn repo_from_params(params map[string]string) ?GitRepo {
 	// If we're creating a new GitRepo, we want all fields to be present before
 	// "patching".
 	$for field in GitRepo.fields {
-		if field.name !in params {
+		if field.name !in params && !field.attrs.contains('optional') {
 			return error('Missing parameter: ${field.name}.')
 		}
 	}

vieter.toml

@@ -8,3 +8,6 @@ repos_file = "data/repos.json"
 default_arch = "x86_64"
 
 address = "http://localhost:8000"
+
+global_schedule = '0 3'
+