feat(server): initialize job queue on start; api endpoint for polling

jobs

src/build/queue.v

@@ -4,6 +4,7 @@ import models { Target }
 import cron.expression { CronExpression, parse_expression }
 import time
 import datatypes { MinHeap }
+import util
 
 struct BuildJob {
 pub:
@@ -23,6 +24,7 @@ pub struct BuildJobQueue {
 	// Base image to use for targets without defined base image
 	default_base_image string
 mut:
+	mutex shared util.Dummy
 	// For each architecture, a priority queue is tracked
 	queues map[string]MinHeap<BuildJob>
 	// Each queued build job is also stored in a map, with the keys being the
@@ -39,6 +41,7 @@ pub fn new_job_queue(default_schedule CronExpression, default_base_image string)
 
 // insert a new job into the queue for a given target on an architecture.
 pub fn (mut q BuildJobQueue) insert(target Target, arch string) ! {
+	lock q.mutex {
 		if arch !in q.queues {
 			q.queues[arch] = MinHeap<BuildJob>{}
 		}
@@ -67,4 +70,66 @@ pub fn (mut q BuildJobQueue) insert(target Target, arch string) ! {
 		}
 
 		q.queues[arch].insert(job)
+	}
+}
+
+// peek shows the first job for the given architecture that's ready to be
+// executed, if present.
+pub fn (q &BuildJobQueue) peek(arch string) ?BuildJob {
+	rlock q.mutex {
+		if arch !in q.queues {
+			return none
+		}
+
+		job := q.queues[arch].peek() or { return none }
+
+		if job.timestamp < time.now() {
+			return job
+		}
+	}
+
+	return none
+}
+
+// pop removes the first job for the given architecture that's ready to be
+// executed from the queue and returns it, if present.
+pub fn (mut q BuildJobQueue) pop(arch string) ?BuildJob {
+	lock q.mutex {
+		if arch !in q.queues {
+			return none
+		}
+
+		job := q.queues[arch].peek() or { return none }
+
+		if job.timestamp < time.now() {
+			return q.queues[arch].pop()
+		}
+	}
+
+	return none
+}
+
+// pop_n tries to pop at most n available jobs for the given architecture.
+pub fn (mut q BuildJobQueue) pop_n(arch string, n int) []BuildJob {
+	lock q.mutex {
+		if arch !in q.queues {
+			return []
+		}
+
+		mut out := []BuildJob{}
+
+		for out.len < n {
+			job := q.queues[arch].peek() or { break }
+
+			if job.timestamp < time.now() {
+				out << q.queues[arch].pop() or { break }
+			} else {
+				break
+			}
+		}
+
+		return out
+	}
+
+	return []
 }

src/server/api_builds.v

@@ -1,39 +1,23 @@
 module server
 
-/* import web */
-/* import web.response { new_data_response, new_response } */
-/* import time */
-/* import build { BuildConfig } */
-/* // import os */
-/* // import util */
-/* // import models { BuildLog, BuildLogFilter } */
+import web
+import web.response { new_data_response, new_response }
+// import os
+// import util
+// import models { BuildLog, BuildLogFilter }
 
-/* ['/api/v1/builds/poll'; auth; get] */
-/* fn (mut app App) v1_poll_build_queue() web.Result { */
-/* 	arch := app.query['arch'] or { */
-/* 		return app.json(.bad_request, new_response('Missing arch query arg.')) */
-/* 	} */
+['/api/v1/builds/poll'; auth; get]
+fn (mut app App) v1_poll_build_queue() web.Result {
+	arch := app.query['arch'] or {
+		return app.json(.bad_request, new_response('Missing arch query arg.'))
+	}
 
-/* 	max_str := app.query['max'] or { */
-/* 		return app.json(.bad_request, new_response('Missing max query arg.')) */
-/* 	} */
-/* 	max := max_str.int() */
+	max_str := app.query['max'] or {
+		return app.json(.bad_request, new_response('Missing max query arg.'))
+	}
+	max := max_str.int()
 
-/* 	mut out := []BuildConfig{} */
+	mut out := app.job_queue.pop_n(arch, max)
 
-/* 	now := time.now() */
-
-/* 	lock app.build_queues { */
-/* 		mut queue := app.build_queues[arch] or { return app.json(.ok, new_data_response(out)) } */
-
-/* 		for queue.len() > 0 && out.len < max { */
-/* 			next := queue.peek() or { return app.status(.internal_server_error) } */
-
-/* 			if next.timestamp < now { */
-/* 				out << queue.pop() or { return app.status(.internal_server_error) }.config */
-/* 			} */
-/* 		} */
-/* 	} */
-
-/* 	return app.json(.ok, new_data_response(out)) */
-/* } */
+	return app.json(.ok, new_data_response(out))
+}

src/server/server.v

@@ -27,31 +27,22 @@ pub mut:
 	db        db.VieterDb
 }
 
-// fn (mut app App) init_build_queues() {
-//	// Initialize build queues
-//	mut i := 0
-//	mut targets := app.db.get_targets(limit: 25)
+fn (mut app App) init_job_queue() ! {
+	// Initialize build queues
+	mut targets := app.db.get_targets(limit: 25)
+	mut i := u64(0)
 
-//	default_ce := expression.parse_expression(conf.global_schedule) or { return }
+	for targets.len > 0 {
+		for target in targets {
+			for arch in target.arch {
+				app.job_queue.insert(target, arch.value)!
+			}
+		}
 
-//	for targets.len > 0 {
-//		for t in targets {
-//			ce := parse_expression(t.schedule) or { default_ce }
-
-//			for arch in t.arch {
-//				if arch !in app.build_queues {
-//					app.build_queues[arch] = Minheap<ScheduledBuild>{}
-//				}
-
-//				build_config := BuildConfig{}
-//				app.build_queues[arch].push(ScheduledBuild{
-//					timestamp: ce.next()
-//					config: build_config
-//				})
-//			}
-//		}
-//	}
-//}
+		i += 25
+		targets = app.db.get_targets(limit: 25, offset: i)
+	}
+}
 
 // server starts the web server & starts listening for requests
 pub fn server(conf Config) ! {
@@ -105,14 +96,17 @@ pub fn server(conf Config) ! {
 		util.exit_with_message(1, 'Failed to initialize database: $err.msg()')
 	}
 
-	mut queue := build.new_job_queue(global_ce, conf.base_image)
-
-	web.run(&App{
+	mut app := &App{
 		logger: logger
 		api_key: conf.api_key
 		conf: conf
 		repo: repo
 		db: db
-		job_queue: queue
-	}, conf.port)
+		job_queue: build.new_job_queue(global_ce, conf.base_image)
+	}
+	app.init_job_queue() or {
+		util.exit_with_message(1, 'Failed to inialize job queue: $err.msg()')
+	}
+
+	web.run(app, conf.port)
 }