[service] Add worker info system

service/mgr/worker_test.go

@@ -0,0 +1,51 @@
+package mgr
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestWorkerInfo(t *testing.T) { //nolint:paralleltest
+	mgr := New("test")
+	mgr.Go("test func one", testFunc1)
+	mgr.Go("test func two", testFunc2)
+	mgr.Go("test func three", testFunc3)
+	defer mgr.Cancel()
+
+	time.Sleep(100 * time.Millisecond)
+
+	info, err := mgr.WorkerInfo(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info.Waiting != 3 {
+		t.Errorf("expected three waiting workers")
+	}
+
+	fmt.Printf("%+v\n", info)
+}
+
+func testFunc1(ctx *WorkerCtx) error {
+	select {
+	case <-time.After(1 * time.Second):
+	case <-ctx.Done():
+	}
+	return nil
+}
+
+func testFunc2(ctx *WorkerCtx) error {
+	select {
+	case <-time.After(1 * time.Second):
+	case <-ctx.Done():
+	}
+	return nil
+}
+
+func testFunc3(ctx *WorkerCtx) error {
+	select {
+	case <-time.After(1 * time.Second):
+	case <-ctx.Done():
+	}
+	return nil
+}