owner: improve unit tests code coverage

owner/fail_test.go

@@ -75,6 +75,7 @@ func (s *testSuite) TestFailNewSession(c *C) {
 			if cli != nil {
 				cli.Close()
 			}
+			c.Assert(failpoint.Disable("github.com/pingcap/tidb/owner/closeClient"), IsNil)
 		}()
 		c.Assert(failpoint.Enable("github.com/pingcap/tidb/owner/closeClient", `return(true)`), IsNil)
 		_, err = NewSession(context.Background(), "fail_new_serssion", cli, retryCnt, ManagerSessionTTL)
@@ -92,6 +93,7 @@ func (s *testSuite) TestFailNewSession(c *C) {
 			if cli != nil {
 				cli.Close()
 			}
+			c.Assert(failpoint.Disable("github.com/pingcap/tidb/owner/closeGrpc"), IsNil)
 		}()
 		c.Assert(failpoint.Enable("github.com/pingcap/tidb/owner/closeGrpc", `return(true)`), IsNil)
 		_, err = NewSession(context.Background(), "fail_new_serssion", cli, retryCnt, ManagerSessionTTL)

owner/manager_test.go

@@ -0,0 +1,175 @@
+// Copyright 2019 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package owner_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/clientv3/concurrency"
+	"github.com/coreos/etcd/integration"
+	"github.com/pingcap/errors"
+	"github.com/pingcap/parser/terror"
+	. "github.com/pingcap/tidb/ddl"
+	"github.com/pingcap/tidb/owner"
+	"github.com/pingcap/tidb/store/mockstore"
+	"github.com/pingcap/tidb/util/logutil"
+	goctx "golang.org/x/net/context"
+)
+
+const testLease = 5 * time.Millisecond
+
+func checkOwner(d DDL, fbVal bool) (isOwner bool) {
+	manager := d.OwnerManager()
+	// The longest to wait for 3 seconds to
+	// make sure that campaigning owners is completed.
+	for i := 0; i < 600; i++ {
+		time.Sleep(5 * time.Millisecond)
+		isOwner = manager.IsOwner()
+		if isOwner == fbVal {
+			break
+		}
+	}
+	return
+}
+
+func TestSingle(t *testing.T) {
+	store, err := mockstore.NewMockTikvStore()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer store.Close()
+
+	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 1})
+	defer clus.Terminate(t)
+	cli := clus.RandClient()
+	ctx := goctx.Background()
+	d := NewDDL(ctx, cli, store, nil, nil, testLease, nil)
+	defer d.Stop()
+
+	isOwner := checkOwner(d, true)
+	if !isOwner {
+		t.Fatalf("expect true, got isOwner:%v", isOwner)
+	}
+
+	// test for newSession failed
+	ctx, cancel := goctx.WithCancel(ctx)
+	cancel()
+	manager := owner.NewOwnerManager(cli, "ddl", "ddl_id", DDLOwnerKey, nil)
+	err = manager.CampaignOwner(ctx)
+	if !terror.ErrorEqual(err, goctx.Canceled) &&
+		!terror.ErrorEqual(err, goctx.DeadlineExceeded) {
+		t.Fatalf("campaigned result don't match, err %v", err)
+	}
+	isOwner = checkOwner(d, true)
+	if !isOwner {
+		t.Fatalf("expect true, got isOwner:%v", isOwner)
+	}
+	// The test is used to exit campaign loop.
+	d.OwnerManager().Cancel()
+	isOwner = checkOwner(d, false)
+	if isOwner {
+		t.Fatalf("expect false, got isOwner:%v", isOwner)
+	}
+	time.Sleep(10 * time.Millisecond)
+	ownerID, _ := manager.GetOwnerID(goctx.Background())
+	// The error is ok to be not nil since we canceled the manager.
+	if ownerID != "" {
+		t.Fatalf("owner %s is not empty", ownerID)
+	}
+}
+
+func TestCluster(t *testing.T) {
+	tmpTTL := 3
+	orignalTTL := owner.ManagerSessionTTL
+	owner.ManagerSessionTTL = tmpTTL
+	defer func() {
+		owner.ManagerSessionTTL = orignalTTL
+	}()
+	store, err := mockstore.NewMockTikvStore()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer store.Close()
+	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 4})
+	defer clus.Terminate(t)
+
+	cli := clus.Client(0)
+	d := NewDDL(goctx.Background(), cli, store, nil, nil, testLease, nil)
+	isOwner := checkOwner(d, true)
+	if !isOwner {
+		t.Fatalf("expect true, got isOwner:%v", isOwner)
+	}
+	cli1 := clus.Client(1)
+	d1 := NewDDL(goctx.Background(), cli1, store, nil, nil, testLease, nil)
+	isOwner = checkOwner(d1, false)
+	if isOwner {
+		t.Fatalf("expect false, got isOwner:%v", isOwner)
+	}
+
+	// Delete the leader key, the d1 become the owner.
+	cliRW := clus.Client(2)
+	err = deleteLeader(cliRW, DDLOwnerKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	isOwner = checkOwner(d, false)
+	if isOwner {
+		t.Fatalf("expect false, got isOwner:%v", isOwner)
+	}
+	d.Stop()
+
+	// d3 (not owner) stop
+	cli3 := clus.Client(3)
+	d3 := NewDDL(goctx.Background(), cli3, store, nil, nil, testLease, nil)
+	defer d3.Stop()
+	isOwner = checkOwner(d3, false)
+	if isOwner {
+		t.Fatalf("expect false, got isOwner:%v", isOwner)
+	}
+	d3.Stop()
+
+	// Cancel the owner context, there is no owner.
+	d1.Stop()
+	time.Sleep(time.Duration(tmpTTL+1) * time.Second)
+	session, err := concurrency.NewSession(cliRW)
+	if err != nil {
+		t.Fatalf("new session failed %v", err)
+	}
+	elec := concurrency.NewElection(session, DDLOwnerKey)
+	logPrefix := fmt.Sprintf("[ddl] %s ownerManager %s", DDLOwnerKey, "useless id")
+	logCtx := logutil.WithKeyValue(context.Background(), "owner info", logPrefix)
+	_, err = owner.GetOwnerInfo(goctx.Background(), logCtx, elec, "useless id")
+	if !terror.ErrorEqual(err, concurrency.ErrElectionNoLeader) {
+		t.Fatalf("get owner info result don't match, err %v", err)
+	}
+}
+
+func deleteLeader(cli *clientv3.Client, prefixKey string) error {
+	session, err := concurrency.NewSession(cli)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer session.Close()
+	elec := concurrency.NewElection(session, prefixKey)
+	resp, err := elec.Leader(goctx.Background())
+	if err != nil {
+		return errors.Trace(err)
+	}
+	_, err = cli.Delete(goctx.Background(), string(resp.Kvs[0].Key))
+	return errors.Trace(err)
+}