Fixed lint errors from golangci-lint

go/cmd/zkctld/zkctld.go

@@ -69,6 +69,11 @@ func main() {
 		log.Infof("server shut down on its own")
 	case <-sig:
 		log.Infof("signal received, shutting down server")
-		zkd.Shutdown()
+
+		// Action to perform if there is an error
+		if err := zkd.Shutdown(); err != nil {
+			log.Errorf("error during shutdown:%v", err)
+			exit.Return(1)
+		}
 	}
 }

go/mysql/fakesqldb/server.go

@@ -29,6 +29,8 @@ import (
 	"testing"
 	"time"
 
+	"vitess.io/vitess/go/vt/log"
+
 	"vitess.io/vitess/go/mysql"
 	"vitess.io/vitess/go/sqltypes"
 
@@ -347,15 +349,22 @@ func (db *DB) HandleQuery(c *mysql.Conn, query string, callback func(*sqltypes.R
 	// Check if we should close the connection and provoke errno 2013.
 	if db.shouldClose {
 		c.Close()
-		callback(&sqltypes.Result{})
+
+		//log error
+		if err := callback(&sqltypes.Result{}); err != nil {
+			log.Errorf("callback failed : %v", err)
+		}
 		return nil
 	}
 
 	// Using special handling for 'SET NAMES utf8'.  The driver
 	// may send this at connection time, and we don't want it to
 	// interfere.
 	if key == "set names utf8" {
-		callback(&sqltypes.Result{})
+		//log error
+		if err := callback(&sqltypes.Result{}); err != nil {
+			log.Errorf("callback failed : %v", err)
+		}
 		return nil
 	}
 

go/mysql/replication_constants.go

@@ -152,54 +152,69 @@ const (
 // These constants describe the event types.
 // See: http://dev.mysql.com/doc/internals/en/binlog-event-type.html
 const (
-	eUnknownEvent           = 0
-	eStartEventV3           = 1
-	eQueryEvent             = 2
-	eStopEvent              = 3
-	eRotateEvent            = 4
-	eIntVarEvent            = 5
-	eLoadEvent              = 6
-	eSlaveEvent             = 7
-	eCreateFileEvent        = 8
-	eAppendBlockEvent       = 9
-	eExecLoadEvent          = 10
-	eDeleteFileEvent        = 11
-	eNewLoadEvent           = 12
-	eRandEvent              = 13
-	eUserVarEvent           = 14
+	//eUnknownEvent           = 0
+	// Unused
+	//eStartEventV3           = 1
+	eQueryEvent = 2
+	//eStopEvent              = 3
+	eRotateEvent = 4
+	eIntVarEvent = 5
+	// Unused
+	//eLoadEvent              = 6
+	// Unused
+	//eSlaveEvent             = 7
+	// Unused
+	//eCreateFileEvent        = 8
+	// Unused
+	//eAppendBlockEvent       = 9
+	//eExecLoadEvent          = 10
+	// Unused
+	//eDeleteFileEvent        = 11
+	// Unused
+	//eNewLoadEvent           = 12
+	eRandEvent = 13
+	// Unused
+	//eUserVarEvent           = 14
 	eFormatDescriptionEvent = 15
 	eXIDEvent               = 16
-	eBeginLoadQueryEvent    = 17
-	eExecuteLoadQueryEvent  = 18
-	eTableMapEvent          = 19
-	eWriteRowsEventV0       = 20
-	eUpdateRowsEventV0      = 21
-	eDeleteRowsEventV0      = 22
-	eWriteRowsEventV1       = 23
-	eUpdateRowsEventV1      = 24
-	eDeleteRowsEventV1      = 25
-	eIncidentEvent          = 26
-	eHeartbeatEvent         = 27
-	eIgnorableEvent         = 28
-	eRowsQueryEvent         = 29
-	eWriteRowsEventV2       = 30
-	eUpdateRowsEventV2      = 31
-	eDeleteRowsEventV2      = 32
-	eGTIDEvent              = 33
-	eAnonymousGTIDEvent     = 34
-	ePreviousGTIDsEvent     = 35
+	//Unused
+	//eBeginLoadQueryEvent    = 17
+	//Unused
+	//eExecuteLoadQueryEvent  = 18
+	eTableMapEvent     = 19
+	eWriteRowsEventV0  = 20
+	eUpdateRowsEventV0 = 21
+	eDeleteRowsEventV0 = 22
+	eWriteRowsEventV1  = 23
+	eUpdateRowsEventV1 = 24
+	eDeleteRowsEventV1 = 25
+	// Unused
+	//eIncidentEvent          = 26
+	//eHeartbeatEvent         = 27
+	// Unused
+	//eIgnorableEvent         = 28
+	// Unused
+	//eRowsQueryEvent         = 29
+	eWriteRowsEventV2   = 30
+	eUpdateRowsEventV2  = 31
+	eDeleteRowsEventV2  = 32
+	eGTIDEvent          = 33
+	eAnonymousGTIDEvent = 34
+	ePreviousGTIDsEvent = 35
 
 	// MySQL 5.7 events. Unused.
 	//eTransactionContextEvent = 36
 	//eViewChangeEvent         = 37
 	//eXAPrepareLogEvent       = 38
 
 	// MariaDB specific values. They start at 160.
-	eMariaAnnotateRowsEvent     = 160
-	eMariaBinlogCheckpointEvent = 161
-	eMariaGTIDEvent             = 162
-	eMariaGTIDListEvent         = 163
-	eMariaStartEncryptionEvent  = 164
+	eMariaAnnotateRowsEvent = 160
+	// Unused
+	//eMariaBinlogCheckpointEvent = 161
+	eMariaGTIDEvent     = 162
+	eMariaGTIDListEvent = 163
+	// Unused
+	//eMariaStartEncryptionEvent  = 164
 )
 
 // These constants describe the type of status variables in q Query packet.

go/test/endtoend/keyspace/keyspace_test.go

@@ -60,7 +60,7 @@ var (
               "column": "keyspace_id",
               "name": "hash_index"
             }
-          ] 
+          ]
         }
       }
 	}`
@@ -246,7 +246,7 @@ func TestDeleteKeyspace(t *testing.T) {
 
 // TODO: Fix this test, not running in CI
 // tells that in zone2 after deleting shard, there is no shard #264 and in zone1 there is only 1 #269
-func RemoveKeyspaceCell(t *testing.T) {
+/*func RemoveKeyspaceCell(t *testing.T) {
 	_ = clusterForKSTest.VtctlclientProcess.ExecuteCommand("CreateKeyspace", "test_delete_keyspace_removekscell")
 	_ = clusterForKSTest.VtctlclientProcess.ExecuteCommand("CreateShard", "test_delete_keyspace_removekscell/0")
 	_ = clusterForKSTest.VtctlclientProcess.ExecuteCommand("CreateShard", "test_delete_keyspace_removekscell/1")
@@ -314,7 +314,7 @@ func RemoveKeyspaceCell(t *testing.T) {
 
 	// Clean up
 	_ = clusterForKSTest.VtctlclientProcess.ExecuteCommand("DeleteKeyspace", "-recursive", "test_delete_keyspace_removekscell")
-}
+} */
 
 func TestShardCountForAllKeyspaces(t *testing.T) {
 	defer cluster.PanicHandler(t)

go/test/endtoend/vtgate/buffer/buffer_test.go

@@ -142,7 +142,10 @@ func updateExecute(c *threadParams, conn *mysql.Conn) error {
 	attempt := c.i
 	// Value used in next UPDATE query. Increased after every query.
 	c.i++
-	conn.ExecuteFetch("begin", 1000, true)
+
+	if _, err := conn.ExecuteFetch("begin", 1000, true); err != nil {
+		log.Errorf("begin failed:%v", err)
+	}
 
 	result, err := conn.ExecuteFetch(fmt.Sprintf("UPDATE buffer SET msg='update %d' WHERE id = %d", attempt, updateRowID), 1000, true)
 
@@ -269,9 +272,11 @@ func testBufferBase(t *testing.T, isExternalParent bool) {
 		externalReparenting(ctx, t, clusterInstance)
 	} else {
 		//reparent call
-		clusterInstance.VtctlclientProcess.ExecuteCommand("PlannedReparentShard", "-keyspace_shard",
+		if err := clusterInstance.VtctlclientProcess.ExecuteCommand("PlannedReparentShard", "-keyspace_shard",
 			fmt.Sprintf("%s/%s", keyspaceUnshardedName, "0"),
-			"-new_master", clusterInstance.Keyspaces[0].Shards[0].Vttablets[1].Alias)
+			"-new_master", clusterInstance.Keyspaces[0].Shards[0].Vttablets[1].Alias); err != nil {
+			log.Errorf("clusterInstance.VtctlclientProcess.ExecuteCommand(\"PlannedRepare... caused an error : %v", err)
+		}
 	}
 
 	<-readThreadInstance.waitForNotification
@@ -354,7 +359,12 @@ func externalReparenting(ctx context.Context, t *testing.T, clusterInstance *clu
 	newMaster := replica
 	master.VttabletProcess.QueryTablet(demoteMasterQuery, keyspaceUnshardedName, true)
 	if master.VttabletProcess.EnableSemiSync {
-		master.VttabletProcess.QueryTablet(disableSemiSyncMasterQuery, keyspaceUnshardedName, true)
+
+		//log error
+		if _, err := master.VttabletProcess.QueryTablet(disableSemiSyncMasterQuery, keyspaceUnshardedName, true); err != nil {
+			log.Errorf("master.VttabletProcess.QueryTablet(disableSemi... caused an error : %v", err)
+		}
+
 	}
 
 	// Wait for replica to catch up to master.
@@ -368,11 +378,16 @@ func externalReparenting(ctx context.Context, t *testing.T, clusterInstance *clu
 		time.Sleep(time.Duration(w) * time.Second)
 	}
 
-	// Promote replica to new master.
-	replica.VttabletProcess.QueryTablet(promoteSlaveQuery, keyspaceUnshardedName, true)
+	//Promote replica to new master and log error
+	if _, err := replica.VttabletProcess.QueryTablet(promoteSlaveQuery, keyspaceUnshardedName, true); err != nil {
+		log.Errorf("replica.VttabletProcess.QueryTablet(promoteSlaveQuery... caused an error : %v", err)
+	}
 
 	if replica.VttabletProcess.EnableSemiSync {
-		replica.VttabletProcess.QueryTablet(enableSemiSyncMasterQuery, keyspaceUnshardedName, true)
+		//Log error
+		if _, err := replica.VttabletProcess.QueryTablet(enableSemiSyncMasterQuery, keyspaceUnshardedName, true); err != nil {
+			log.Errorf("replica.VttabletProcess.QueryTablet caused an error : %v", err)
+		}
 	}
 
 	// Configure old master to replicate from new master.
@@ -382,8 +397,14 @@ func externalReparenting(ctx context.Context, t *testing.T, clusterInstance *clu
 	// Use 'localhost' as hostname because Travis CI worker hostnames
 	// are too long for MySQL replication.
 	changeMasterCommands := fmt.Sprintf("RESET SLAVE;SET GLOBAL gtid_slave_pos = '%s';CHANGE MASTER TO MASTER_HOST='%s', MASTER_PORT=%d ,MASTER_USER='vt_repl', MASTER_USE_GTID = slave_pos;START SLAVE;", gtID, "localhost", newMaster.MySQLPort)
-	oldMaster.VttabletProcess.QueryTablet(changeMasterCommands, keyspaceUnshardedName, true)
 
-	// Notify the new vttablet master about the reparent.
-	clusterInstance.VtctlclientProcess.ExecuteCommand("TabletExternallyReparented", newMaster.Alias)
+	//Log error
+	if _, err := oldMaster.VttabletProcess.QueryTablet(changeMasterCommands, keyspaceUnshardedName, true); err != nil {
+		log.Errorf("oldMaster.VttabletProcess.QueryTablet caused an error : %v", err)
+	}
+
+	//Notify the new vttablet master about the reparent and Log error
+	if err := clusterInstance.VtctlclientProcess.ExecuteCommand("TabletExternallyReparented", newMaster.Alias); err != nil {
+		log.Errorf("clusterInstance.VtctlclientProcess.ExecuteCommand caused an error : %v", err)
+	}
 }

go/vt/binlog/binlogplayer/framework_test.go

@@ -21,6 +21,8 @@ import (
 	"reflect"
 	"testing"
 
+	"vitess.io/vitess/go/vt/log"
+
 	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/context"
 
@@ -116,5 +118,9 @@ var globalFBC *fakeBinlogClient
 
 func init() {
 	RegisterClientFactory("test", func() Client { return globalFBC })
-	flag.Set("binlog_player_protocol", "test")
+
+	//log error
+	if err := flag.Set("binlog_player_protocol", "test"); err != nil {
+		log.Errorf("failed to set flag \"binlog_player_protocol\" to \"test\":%v", err)
+	}
 }

go/vt/discovery/healthcheck.go

@@ -715,13 +715,21 @@ func (hc *HealthCheckImpl) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
 	status := hc.CacheStatus()
 	b, err := json.MarshalIndent(status, "", " ")
 	if err != nil {
-		w.Write([]byte(err.Error()))
+		//Error logged
+		if _, err := w.Write([]byte(err.Error())); err != nil {
+			log.Errorf("write to buffer error failed: %v", err)
+		}
+
 		return
 	}
 
 	buf := bytes.NewBuffer(nil)
 	json.HTMLEscape(buf, b)
-	w.Write(buf.Bytes())
+
+	//Error logged
+	if _, err := w.Write(buf.Bytes()); err != nil {
+		log.Errorf("write to buffer bytes failed: %v", err)
+	}
 }
 
 // servingConnStats returns the number of serving tablets per keyspace/shard/tablet type.

go/vt/discovery/healthcheck_test.go

@@ -27,6 +27,8 @@ import (
 	"testing"
 	"time"
 
+	"vitess.io/vitess/go/vt/log"
+
 	"vitess.io/vitess/go/test/utils"
 	"vitess.io/vitess/go/vt/vttablet/queryservice/fakes"
 
@@ -48,7 +50,11 @@ import (
 
 func init() {
 	tabletconn.RegisterDialer("fake_gateway", tabletDialer)
-	flag.Set("tablet_protocol", "fake_gateway")
+
+	//log error
+	if err := flag.Set("tablet_protocol", "fake_gateway"); err != nil {
+		log.Errorf("failed to set flag \"tablet_protocol\" to \"fake_gateway\":%v", err)
+	}
 }
 
 func TestHealthCheck(t *testing.T) {
@@ -730,7 +736,11 @@ func TestTemplate(t *testing.T) {
 }
 
 func TestDebugURLFormatting(t *testing.T) {
-	flag.Set("tablet_url_template", "https://{{.GetHostNameLevel 0}}.bastion.{{.Tablet.Alias.Cell}}.corp")
+
+	//log error
+	if err2 := flag.Set("tablet_url_template", "https://{{.GetHostNameLevel 0}}.bastion.{{.Tablet.Alias.Cell}}.corp"); err2 != nil {
+		log.Errorf("flag.Set(\"tablet_url_template\", \"https://{{.GetHostNameLevel 0}}.bastion.{{.Tablet.Alias.Cell}}.corp\") failed : %v", err2)
+	}
 	ParseTabletURLTemplateFromFlag()
 
 	tablet := topo.NewTablet(0, "cell", "host.dc.domain")

go/vt/discovery/legacy_healthcheck.go

@@ -222,7 +222,11 @@ func (e LegacyTabletStats) NamedStatusURL() string {
 // {{.NamedStatusURL}} -> test-0000000001/debug/status
 func (e LegacyTabletStats) getTabletDebugURL() string {
 	var buffer bytes.Buffer
-	tabletURLTemplate.Execute(&buffer, e)
+
+	//Error logged
+	if err := tabletURLTemplate.Execute(&buffer, e); err != nil {
+		log.Errorf("tabletURLTemplate.Execute(&buffer, e) failed: %v", err)
+	}
 	return buffer.String()
 }
 

go/vt/discovery/legacy_healthcheck_flaky_test.go

@@ -26,6 +26,8 @@ import (
 	"testing"
 	"time"
 
+	"vitess.io/vitess/go/vt/log"
+
 	"golang.org/x/net/context"
 	"vitess.io/vitess/go/vt/grpcclient"
 	"vitess.io/vitess/go/vt/status"
@@ -42,7 +44,11 @@ var connMap map[string]*fakeConn
 
 func init() {
 	tabletconn.RegisterDialer("fake_discovery", discoveryDialer)
-	flag.Set("tablet_protocol", "fake_discovery")
+
+	//log error
+	if err := flag.Set("tablet_protocol", "fake_discovery"); err != nil {
+		log.Errorf("flag.Set(\"tablet_protocol\", \"fake_discovery\") failed : %v", err)
+	}
 	connMap = make(map[string]*fakeConn)
 }