Move client and launcher to its own files

launcher.go

@@ -0,0 +1,61 @@
+package asynq
+
+import (
+	"sync"
+	"time"
+
+	"github.com/go-redis/redis/v7"
+)
+
+// Launcher starts the manager and poller.
+type Launcher struct {
+	// running indicates whether manager and poller are both running.
+	running bool
+	mu      sync.Mutex
+
+	poller *poller
+
+	manager *manager
+}
+
+// NewLauncher creates and returns a new Launcher.
+func NewLauncher(poolSize int, opt *RedisOpt) *Launcher {
+	client := redis.NewClient(&redis.Options{Addr: opt.Addr, Password: opt.Password})
+	rdb := newRDB(client)
+	poller := newPoller(rdb, 5*time.Second, []string{scheduled, retry})
+	manager := newManager(rdb, poolSize, nil)
+	return &Launcher{
+		poller:  poller,
+		manager: manager,
+	}
+}
+
+// TaskHandler handles a given task and report any error.
+type TaskHandler func(*Task) error
+
+// Start starts the manager and poller.
+func (l *Launcher) Start(handler TaskHandler) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.running {
+		return
+	}
+	l.running = true
+	l.manager.handler = handler
+
+	l.poller.start()
+	l.manager.start()
+}
+
+// Stop stops both manager and poller.
+func (l *Launcher) Stop() {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if !l.running {
+		return
+	}
+	l.running = false
+
+	l.poller.terminate()
+	l.manager.terminate()
+}