package cmd import ( "context" "fmt" "runtime" "github.com/spf13/cobra" "github.com/christianselig/apollo-backend/internal/cmdutil" "github.com/christianselig/apollo-backend/internal/worker" ) var ( queues = map[string]worker.NewWorkerFn{ "notifications": worker.NewNotificationsWorker, "stuck-notifications": worker.NewStuckNotificationsWorker, "subreddits": worker.NewSubredditsWorker, "trending": worker.NewTrendingWorker, "users": worker.NewUsersWorker, } ) func WorkerCmd(ctx context.Context) *cobra.Command { var multiplier int var queueID string cmd := &cobra.Command{ Use: "worker", Args: cobra.ExactArgs(0), Short: "Work through job queues.", RunE: func(cmd *cobra.Command, args []string) error { if queueID == "" { return fmt.Errorf("need a queue to work on") } svc := fmt.Sprintf("worker: %s", queueID) logger := cmdutil.NewLogger(svc) defer func() { _ = logger.Sync() }() tag := fmt.Sprintf("worker:%s", queueID) statsd, err := cmdutil.NewStatsdClient(tag) if err != nil { return err } defer statsd.Close() consumers := runtime.NumCPU() * multiplier poolSize := multiplier / 4 db, err := cmdutil.NewDatabasePool(ctx, poolSize) if err != nil { return err } defer db.Close() redis, err := cmdutil.NewRedisClient(ctx, poolSize) if err != nil { return err } defer redis.Close() queue, err := cmdutil.NewQueueClient(logger, redis, "worker") if err != nil { return err } workerFn, ok := queues[queueID] if !ok { return fmt.Errorf("invalid queue: %s", queueID) } worker := workerFn(ctx, logger, statsd, db, redis, queue, consumers) if err := worker.Start(); err != nil { return err } <-ctx.Done() worker.Stop() return nil }, } cmd.Flags().IntVar(&multiplier, "multiplier", 12, "The multiplier (by CPUs) to run") cmd.Flags().StringVar(&queueID, "queue", "", "The queue to work on") return cmd }