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Published: Feb 9, 2021 License: Apache-2.0 Imports: 18 Imported by: 0



Package logutil includes utilities to facilitate logging.



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var DefaultLogLevel = "info"
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var DefaultZapLoggerConfig = zap.Config{
	Level: zap.NewAtomicLevelAt(ConvertToZapLevel(DefaultLogLevel)),

	Development: false,
	Sampling: &zap.SamplingConfig{
		Initial:    100,
		Thereafter: 100,

	Encoding: "json",

	EncoderConfig: zapcore.EncoderConfig{
		TimeKey:        "ts",
		LevelKey:       "level",
		NameKey:        "logger",
		CallerKey:      "caller",
		MessageKey:     "msg",
		StacktraceKey:  "stacktrace",
		LineEnding:     zapcore.DefaultLineEnding,
		EncodeLevel:    zapcore.LowercaseLevelEncoder,
		EncodeTime:     zapcore.ISO8601TimeEncoder,
		EncodeDuration: zapcore.StringDurationEncoder,
		EncodeCaller:   zapcore.ShortCallerEncoder,

	OutputPaths:      []string{"stderr"},
	ErrorOutputPaths: []string{"stderr"},

DefaultZapLoggerConfig defines default zap logger configuration.


func ConvertToCapnslogLogLevel

func ConvertToCapnslogLogLevel(lvl string) capnslog.LogLevel

ConvertToCapnslogLogLevel convert log level string to capnslog.LogLevel. TODO: deprecate this in 3.5

func ConvertToZapLevel

func ConvertToZapLevel(lvl string) zapcore.Level

ConvertToZapLevel converts log level string to zapcore.Level.

func MergeOutputPaths

func MergeOutputPaths(cfg zap.Config) zap.Config

MergeOutputPaths merges logging output paths, resolving conflicts.

func NewGRPCLoggerV2

func NewGRPCLoggerV2(lcfg zap.Config) (grpclog.LoggerV2, error)

NewGRPCLoggerV2 converts "*zap.Logger" to "grpclog.LoggerV2". It discards all INFO level logging in gRPC, if debug level is not enabled in "*zap.Logger".

func NewGRPCLoggerV2FromZapCore

func NewGRPCLoggerV2FromZapCore(cr zapcore.Core, syncer zapcore.WriteSyncer) grpclog.LoggerV2

NewGRPCLoggerV2FromZapCore creates "grpclog.LoggerV2" from "zap.Core" and "zapcore.WriteSyncer". It discards all INFO level logging in gRPC, if debug level is not enabled in "*zap.Logger".

func NewJournalWriter

func NewJournalWriter(wr io.Writer) (io.Writer, error)

NewJournalWriter wraps "io.Writer" to redirect log output to the local systemd journal. If journald send fails, it fails back to writing to the original writer. The decode overhead is only <30µs per write. Reference: https://github.com/coreos/pkg/blob/master/capnslog/journald_formatter.go

func NewRaftLogger

func NewRaftLogger(lcfg *zap.Config) (raft.Logger, error)

NewRaftLogger builds "raft.Logger" from "*zap.Config".

func NewRaftLoggerFromZapCore

func NewRaftLoggerFromZapCore(cr zapcore.Core, syncer zapcore.WriteSyncer) raft.Logger

NewRaftLoggerFromZapCore creates "raft.Logger" from "zap.Core" and "zapcore.WriteSyncer".

func NewRaftLoggerZap

func NewRaftLoggerZap(lg *zap.Logger) raft.Logger

NewRaftLoggerZap converts "*zap.Logger" to "raft.Logger".


type Logger

type Logger interface {

	// Lvl returns logger if logger's verbosity level >= "lvl".
	// Otherwise, logger that discards everything.
	Lvl(lvl int) grpclog.LoggerV2

Logger defines logging interface. TODO: deprecate in v3.5.

func NewDiscardLogger

func NewDiscardLogger() Logger

NewDiscardLogger returns a new Logger that discards everything except "fatal".

func NewLogger

func NewLogger(g grpclog.LoggerV2) Logger

NewLogger wraps "grpclog.LoggerV2" that implements "Logger" interface.

For example:

var defaultLogger Logger
g := grpclog.NewLoggerV2WithVerbosity(os.Stderr, os.Stderr, os.Stderr, 4)
defaultLogger = NewLogger(g)

func NewPackageLogger

func NewPackageLogger(repo, pkg string) Logger

NewPackageLogger wraps "*capnslog.PackageLogger" that implements "Logger" interface.

For example:

var defaultLogger Logger
defaultLogger = NewPackageLogger("go.etcd.io/etcd", "snapshot")

type MergeLogger

type MergeLogger struct {
	// contains filtered or unexported fields

MergeLogger supports merge logging, which merges repeated log lines and prints summary log lines instead.

For merge logging, MergeLogger prints out the line when the line appears at the first time. MergeLogger holds the same log line printed within defaultMergePeriod, and prints out summary log line at the end of defaultMergePeriod. It stops merging when the line doesn't appear within the defaultMergePeriod.

func NewMergeLogger

func NewMergeLogger(logger *capnslog.PackageLogger) *MergeLogger

func (*MergeLogger) MergeError

func (l *MergeLogger) MergeError(entries ...interface{})

func (*MergeLogger) MergeErrorf

func (l *MergeLogger) MergeErrorf(format string, args ...interface{})

func (*MergeLogger) MergeInfo

func (l *MergeLogger) MergeInfo(entries ...interface{})

func (*MergeLogger) MergeInfof

func (l *MergeLogger) MergeInfof(format string, args ...interface{})

func (*MergeLogger) MergeNotice

func (l *MergeLogger) MergeNotice(entries ...interface{})

func (*MergeLogger) MergeNoticef

func (l *MergeLogger) MergeNoticef(format string, args ...interface{})

func (*MergeLogger) MergeWarning

func (l *MergeLogger) MergeWarning(entries ...interface{})

func (*MergeLogger) MergeWarningf

func (l *MergeLogger) MergeWarningf(format string, args ...interface{})

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