package job import ( "database/sql" "errors" "log/slog" "time" "ewintr.nl/emdb/cmd/api-service/moviestore" ) type JobQueue struct { db *moviestore.SQLite out chan Job logger *slog.Logger } func NewJobQueue(db *moviestore.SQLite, logger *slog.Logger) *JobQueue { return &JobQueue{ db: db, out: make(chan Job), logger: logger.With("service", "jobqueue"), } } func (jq *JobQueue) Add(movieID string, action Action) error { _, err := jq.db.Exec(`INSERT INTO job_queue (movie_id, action, status) VALUES (?, ?, 'todo')`, movieID, action) return err } func (jq *JobQueue) Next() chan Job { return jq.out } func (jq *JobQueue) Run() { logger := jq.logger.With("method", "run") logger.Info("starting job queue") for { row := jq.db.QueryRow(` SELECT id, movie_id, action FROM job_queue WHERE status='todo' ORDER BY id DESC LIMIT 1`) var job Job err := row.Scan(&job.ID, &job.MovieID, &job.Action) switch { case errors.Is(err, sql.ErrNoRows): logger.Info("nothing to do") time.Sleep(interval) continue case err != nil: logger.Error("could not fetch next job", "error", row.Err()) time.Sleep(interval) continue } logger.Info("found a job", "id", job.ID) if _, err := jq.db.Exec(` UPDATE job_queue SET status='doing' WHERE id=?`, job.ID); err != nil { logger.Error("could not set job to doing", "error") time.Sleep(interval) continue } jq.out <- job } } func (jq *JobQueue) MarkDone(id string) { logger := jq.logger.With("method", "markdone") if _, err := jq.db.Exec(` UPDATE job_queue SET status='done' WHERE id=?`, id); err != nil { logger.Error("could not mark job done", "error", err) } return }