slack-19.0: add structured logging

go.mod

@@ -102,10 +102,12 @@ require (
 	github.com/kr/text v0.2.0
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/nsf/jsondiff v0.0.0-20210926074059-1e845ec5d249
+	github.com/slok/noglog v0.2.0
 	github.com/spf13/afero v1.11.0
 	github.com/spf13/jwalterweatherman v1.1.0
 	github.com/xlab/treeprint v1.2.0
 	go.uber.org/goleak v1.3.0
+	go.uber.org/zap v1.27.0
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225
 	golang.org/x/sync v0.6.0
 	gonum.org/v1/gonum v0.14.0
@@ -183,7 +185,6 @@ require (
 	go.opentelemetry.io/otel/trace v1.24.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
 	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20240304212257-790db918fca8 // indirect

go.sum

@@ -450,6 +450,8 @@ github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6Mwd
 github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/sjmudd/stopwatch v0.1.1 h1:x45OvxFB5OtCkjvYtzRF5fWB857Jzjjk84Oyd5C5ebw=
 github.com/sjmudd/stopwatch v0.1.1/go.mod h1:BLw0oIQJ1YLXBO/q9ufK/SgnKBVIkC2qrm6uy78Zw6U=
+github.com/slok/noglog v0.2.0 h1:1czu4l2EoJ8L92UwdSXXa1Y+c5TIjFAFm2P+mjej95E=
+github.com/slok/noglog v0.2.0/go.mod h1:TfKxwpEZPT+UA83bQ6RME146k0MM4e8mwHLf6bhcGDI=
 github.com/smartystreets/assertions v0.0.0-20190116191733-b6c0e53d7304/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c/go.mod h1:XDJAKZRPZ1CvBcN2aX5YOUTYGHki24fSF0Iv48Ibg0s=
 github.com/soheilhy/cmux v0.1.5 h1:jjzc5WVemNEDTLwv9tlmemhC73tI08BNOIGwBOo10Js=

go/flags/endtoend/mysqlctl.txt

@@ -88,6 +88,7 @@ Flags:
       --service_map strings                                         comma separated list of services to enable (or disable if prefixed with '-') Example: grpc-queryservice
       --socket_file string                                          Local unix socket file to listen on
       --stderrthreshold severityFlag                                logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                          enable structured logging
       --table-refresh-interval int                                  interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_dir string                                           The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.
       --tablet_uid uint32                                           Tablet UID. (default 41983)

go/flags/endtoend/mysqlctld.txt

@@ -114,6 +114,7 @@ Flags:
       --shutdown-wait-time duration                                      How long to wait for mysqld shutdown (default 5m0s)
       --socket_file string                                               Local unix socket file to listen on
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_dir string                                                The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.
       --tablet_uid uint32                                                Tablet UID (default 41983)

go/flags/endtoend/vtcombo.txt

@@ -334,6 +334,7 @@ Flags:
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
       --stream_buffer_size int                                           the number of bytes sent from vtgate for each stream call. It's recommended to keep this value in sync with vttablet's query-server-config-stream-buffer-size. (default 32768)
       --stream_health_buffer_size uint                                   max streaming health entries to buffer per streaming health client (default 20)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --table_gc_lifecycle string                                        States for a DROP TABLE garbage collection cycle. Default is 'hold,purge,evac,drop', use any subset ('drop' implicitly always included) (default "hold,purge,evac,drop")
       --tablet_dir string                                                The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.

go/flags/endtoend/vtctld.txt

@@ -131,6 +131,7 @@ Flags:
       --stats_drop_variables string                                      Variables to be dropped from the list of exported variables.
       --stats_emit_period duration                                       Interval between emitting stats to all registered backends (default 1m0s)
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_dir string                                                The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.
       --tablet_grpc_ca string                                            the server ca to use to validate servers when connecting

go/flags/endtoend/vtgate.txt

@@ -192,6 +192,7 @@ Flags:
       --statsd_sample_rate float                                         Sample rate for statsd metrics (default 1)
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
       --stream_buffer_size int                                           the number of bytes sent from vtgate for each stream call. It's recommended to keep this value in sync with vttablet's query-server-config-stream-buffer-size. (default 32768)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_filters strings                                           Specifies a comma-separated list of 'keyspace|shard_name or keyrange' values to filter the tablets to watch.
       --tablet_grpc_ca string                                            the server ca to use to validate servers when connecting

go/flags/endtoend/vtgateclienttest.txt

@@ -61,6 +61,7 @@ Flags:
       --security_policy string                                           the name of a registered security policy to use for controlling access to URLs - empty means allow all for anyone (built-in policies: deny-all, read-only)
       --service_map strings                                              comma separated list of services to enable (or disable if prefixed with '-') Example: grpc-queryservice
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --v Level                                                          log level for V logs
   -v, --version                                                          print binary version

go/flags/endtoend/vtorc.txt

@@ -78,6 +78,7 @@ Flags:
       --stats_drop_variables string                                 Variables to be dropped from the list of exported variables.
       --stats_emit_period duration                                  Interval between emitting stats to all registered backends (default 1m0s)
       --stderrthreshold severityFlag                                logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                          enable structured logging
       --table-refresh-interval int                                  interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_manager_grpc_ca string                               the server ca to use to validate servers when connecting
       --tablet_manager_grpc_cert string                             the cert to use to connect

go/flags/endtoend/vttablet.txt

@@ -332,6 +332,7 @@ Flags:
       --statsd_sample_rate float                                         Sample rate for statsd metrics (default 1)
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
       --stream_health_buffer_size uint                                   max streaming health entries to buffer per streaming health client (default 20)
+      --structured-logging                                               enable structured logging
       --table-acl-config string                                          path to table access checker config file; send SIGHUP to reload this file
       --table-acl-config-reload-interval duration                        Ticker to reload ACLs. Duration flag, format e.g.: 30s. Default: do not reload
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class

go/flags/endtoend/vttestserver.txt

@@ -115,6 +115,7 @@ Flags:
       --sql-max-length-errors int                                        truncate queries in error logs to the given length (default unlimited)
       --sql-max-length-ui int                                            truncate queries in debug UIs to the given length (default 512) (default 512)
       --stderrthreshold severityFlag                                     logs at or above this threshold go to stderr (default 1)
+      --structured-logging                                               enable structured logging
       --table-refresh-interval int                                       interval in milliseconds to refresh tables in status page with refreshRequired class
       --tablet_dir string                                                The directory within the vtdataroot to store vttablet/mysql files. Defaults to being generated by the tablet uid.
       --tablet_hostname string                                           The hostname to use for the tablet otherwise it will be derived from OS' hostname (default "localhost")

go/vt/logutil/logger.go

@@ -24,7 +24,11 @@ import (
 	"sync"
 	"time"
 
+	noglog "github.com/slok/noglog"
+	"go.uber.org/zap"
+
 	"vitess.io/vitess/go/protoutil"
+	"vitess.io/vitess/go/vt/log"
 	logutilpb "vitess.io/vitess/go/vt/proto/logutil"
 )
 
@@ -383,3 +387,46 @@ func fileAndLine(depth int) (string, int64) {
 	}
 	return file, int64(line)
 }
+
+type StructuredLogger zap.SugaredLogger
+
+// SetStructuredLogger in-place noglog replacement with Zap's logger.
+func SetStructuredLogger(conf *zap.Config) (vtSLogger *zap.SugaredLogger, err error) {
+	var l *zap.Logger
+
+	// Use the passed configuration instead of the default configuration
+	if conf == nil {
+		defaultProdConf := zap.NewProductionConfig()
+		conf = &defaultProdConf
+	}
+
+	// Build configuration and generate a sugared logger
+	l, err = conf.Build()
+	vtSLogger = l.Sugar()
+
+	noglog.SetLogger(&noglog.LoggerFunc{
+		DebugfFunc: func(f string, a ...interface{}) { vtSLogger.Debugf(f, a...) },
+		InfofFunc:  func(f string, a ...interface{}) { vtSLogger.Infof(f, a...) },
+		WarnfFunc:  func(f string, a ...interface{}) { vtSLogger.Warnf(f, a...) },
+		ErrorfFunc: func(f string, a ...interface{}) { vtSLogger.Errorf(f, a...) },
+	})
+
+	log.Flush = noglog.Flush
+	log.Info = noglog.Info
+	log.Infof = noglog.Infof
+	log.InfoDepth = noglog.InfoDepth
+	log.Warning = noglog.Warning
+	log.Warningf = noglog.Warningf
+	log.WarningDepth = noglog.WarningDepth
+	log.Error = noglog.Error
+	log.Errorf = noglog.Errorf
+	log.ErrorDepth = noglog.ErrorDepth
+	log.Exit = noglog.Exit
+	log.Exitf = noglog.Exitf
+	log.ExitDepth = noglog.ExitDepth
+	log.Fatal = noglog.Fatal
+	log.Fatalf = noglog.Fatalf
+	log.FatalDepth = noglog.FatalDepth
+
+	return
+}

go/vt/logutil/logger_test.go

@@ -17,9 +17,18 @@ limitations under the License.
 package logutil
 
 import (
+	"bytes"
+	"encoding/json"
+	"net/url"
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+
+	vtlog "vitess.io/vitess/go/vt/log"
+
 	"vitess.io/vitess/go/protoutil"
 	"vitess.io/vitess/go/race"
 	logutilpb "vitess.io/vitess/go/vt/proto/logutil"
@@ -152,3 +161,102 @@ func TestTeeLogger(t *testing.T) {
 		}
 	}
 }
+
+// MemorySink implements zap.Sink by writing all messages to a buffer.
+// It's used to capture the logs.
+type MemorySink struct {
+	*bytes.Buffer
+}
+
+// Implement Close and Sync as no-ops to satisfy the interface. The Write
+// method is provided by the embedded buffer.
+func (s *MemorySink) Close() error { return nil }
+func (s *MemorySink) Sync() error  { return nil }
+
+func SetupLoggerWithMemSink() (sink *MemorySink, err error) {
+	// Create a sink instance, and register it with zap for the "memory" protocol.
+	sink = &MemorySink{new(bytes.Buffer)}
+	err = zap.RegisterSink("memory", func(*url.URL) (zap.Sink, error) {
+		return sink, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	testLoggerConf := NewMemorySinkConfig()
+	_, err = SetStructuredLogger(&testLoggerConf)
+	if err != nil {
+		return nil, err
+	}
+
+	return
+}
+
+func NewMemorySinkConfig() zap.Config {
+	return zap.Config{
+		Level:       zap.NewAtomicLevelAt(zap.InfoLevel),
+		Development: false,
+		Sampling: &zap.SamplingConfig{
+			Initial:    100,
+			Thereafter: 100,
+		},
+		Encoding:         "json",
+		EncoderConfig:    zap.NewProductionEncoderConfig(),
+		OutputPaths:      []string{"memory://"},
+		ErrorOutputPaths: []string{"memory://"},
+	}
+}
+
+func TestStructuredLogger_Replacing_glog(t *testing.T) {
+	type logMsg struct {
+		Level string `json:"level"`
+		Msg   string `json:"msg"`
+	}
+
+	type testCase struct {
+		name     string
+		logLevel zapcore.Level
+	}
+
+	dummyLogMessage := "testing log"
+	testCases := []testCase{
+		{"log info", zap.InfoLevel},
+		{"log warn", zap.WarnLevel},
+		{"log error", zap.ErrorLevel},
+	}
+
+	sink, err := SetupLoggerWithMemSink()
+	assert.NoError(t, err)
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var loggingFunc func(format string, args ...interface{})
+			var expectedLevel string
+
+			switch tc.logLevel {
+			case zapcore.InfoLevel:
+				loggingFunc = vtlog.Infof
+				expectedLevel = "info"
+			case zapcore.ErrorLevel:
+				loggingFunc = vtlog.Errorf
+				expectedLevel = "error"
+			case zapcore.WarnLevel:
+				loggingFunc = vtlog.Warningf
+				expectedLevel = "warn"
+			}
+
+			loggingFunc(dummyLogMessage)
+
+			// Unmarshal the captured log. This means we're getting a struct log.
+			actualLog := logMsg{}
+			err = json.Unmarshal(sink.Bytes(), &actualLog)
+			assert.NoError(t, err)
+			// Reset the sink so that it'll contain one log per test case.
+			sink.Reset()
+
+			assert.Equal(t, expectedLevel, actualLog.Level)
+			assert.Equal(t, dummyLogMessage, actualLog.Msg)
+
+		})
+	}
+}

go/vt/servenv/servenv.go

@@ -82,6 +82,7 @@ var (
 	maxStackSize         = 64 * 1024 * 1024
 	initStartTime        time.Time // time when tablet init started: for debug purposes to time how long a tablet init takes
 	tableRefreshInterval int
+	useStructuredLogger  bool
 )
 
 // RegisterFlags installs the flags used by Init, Run, and RunDefault.
@@ -98,7 +99,10 @@ func RegisterFlags() {
 		fs.IntVar(&tableRefreshInterval, "table-refresh-interval", tableRefreshInterval, "interval in milliseconds to refresh tables in status page with refreshRequired class")
 
 		// pid_file.go
-		fs.StringVar(&pidFile, "pid_file", pidFile, "If set, the process will write its pid to the named file, and delete it on graceful shutdown.")
+		fs.StringVar(&pidFile, "pid_file", pidFile, "If set, the process will write its pid to the named file, and delete it on graceful shutdown.") // Logging
+
+		// Logging
+		fs.BoolVar(&useStructuredLogger, "structured-logging", useStructuredLogger, "enable structured logging")
 	})
 }
 
@@ -285,6 +289,14 @@ func ParseFlags(cmd string) {
 		os.Exit(0)
 	}
 
+	if useStructuredLogger {
+		// Replace glog logger with zap logger
+		_, err := logutil.SetStructuredLogger(nil)
+		if err != nil {
+			log.Exitf("error while setting the structured logger: %s", err)
+		}
+	}
+
 	args := fs.Args()
 	if len(args) > 0 {
 		_flag.Usage()