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config.go
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config.go
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// Copyright 2017 Istio Authors
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package log provides the canonical logging functionality used by Go-based
// Istio components.
//
// Istio's logging subsystem is built on top of the [Zap](https://godoc.org/go.uber.org/zap) package.
// High performance scenarios should use the Error, Warn, Info, and Debug methods. Lower perf
// scenarios can use the more expensive convenience methods such as Debugf and Warnw.
//
// The package provides direct integration with the Cobra command-line processor which makes it
// easy to build programs that use a consistent interface for logging. Here's an example
// of a simple Cobra-based program using this log package:
//
// func main() {
// // get the default logging options
// options := log.DefaultOptions()
//
// rootCmd := &cobra.Command{
// Run: func(cmd *cobra.Command, args []string) {
//
// // configure the logging system
// if err := log.Configure(options); err != nil {
// // print an error and quit
// }
//
// // output some logs
// log.Info("Hello")
// log.Sync()
// },
// }
//
// // add logging-specific flags to the cobra command
// options.AttachCobraFlags(rootCmd)
// rootCmd.SetArgs(os.Args[1:])
// rootCmd.Execute()
// }
//
// Once configured, this package intercepts the output of the standard golang "log" package as well as anything
// sent to the global zap logger (zap.L()).
package log
import (
"fmt"
"strings"
"sync/atomic"
"time"
"github.com/natefinch/lumberjack"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"go.uber.org/zap/zapgrpc"
"google.golang.org/grpc/grpclog"
)
// none is used to disable logging output as well as to disable stack tracing.
const none zapcore.Level = 100
var levelToZap = map[Level]zapcore.Level{
DebugLevel: zapcore.DebugLevel,
InfoLevel: zapcore.InfoLevel,
WarnLevel: zapcore.WarnLevel,
ErrorLevel: zapcore.ErrorLevel,
FatalLevel: zapcore.FatalLevel,
NoneLevel: none,
}
func init() {
// use our defaults for starters so that logging works even before everything is fully configured
_ = Configure(DefaultOptions())
}
// prepZap is a utility function used by the Configure function.
func prepZap(options *Options) (zapcore.Core, zapcore.Core, zapcore.WriteSyncer, error) {
encCfg := zapcore.EncoderConfig{
TimeKey: "time",
LevelKey: "level",
NameKey: "scope",
CallerKey: "caller",
MessageKey: "msg",
StacktraceKey: "stack",
LineEnding: zapcore.DefaultLineEnding,
EncodeLevel: zapcore.LowercaseLevelEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
EncodeDuration: zapcore.StringDurationEncoder,
EncodeTime: formatDate,
}
var enc zapcore.Encoder
if options.JSONEncoding {
enc = zapcore.NewJSONEncoder(encCfg)
} else {
enc = zapcore.NewConsoleEncoder(encCfg)
}
var rotaterSink zapcore.WriteSyncer
if options.RotateOutputPath != "" {
rotaterSink = zapcore.AddSync(&lumberjack.Logger{
Filename: options.RotateOutputPath,
MaxSize: options.RotationMaxSize,
MaxBackups: options.RotationMaxBackups,
MaxAge: options.RotationMaxAge,
})
}
errSink, closeErrorSink, err := zap.Open(options.ErrorOutputPaths...)
if err != nil {
return nil, nil, nil, err
}
var outputSink zapcore.WriteSyncer
if len(options.OutputPaths) > 0 {
outputSink, _, err = zap.Open(options.OutputPaths...)
if err != nil {
closeErrorSink()
return nil, nil, nil, err
}
}
var sink zapcore.WriteSyncer
if rotaterSink != nil && outputSink != nil {
sink = zapcore.NewMultiWriteSyncer(outputSink, rotaterSink)
} else if rotaterSink != nil {
sink = rotaterSink
} else {
sink = outputSink
}
var enabler zap.LevelEnablerFunc = func(lvl zapcore.Level) bool {
switch lvl {
case zapcore.ErrorLevel:
return defaultScope.ErrorEnabled()
case zapcore.WarnLevel:
return defaultScope.WarnEnabled()
case zapcore.InfoLevel:
return defaultScope.InfoEnabled()
}
return defaultScope.DebugEnabled()
}
return zapcore.NewCore(enc, sink, zap.NewAtomicLevelAt(zapcore.DebugLevel)),
zapcore.NewCore(enc, sink, enabler),
errSink, nil
}
func formatDate(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
t = t.UTC()
year, month, day := t.Date()
hour, minute, second := t.Clock()
micros := t.Nanosecond() / 1000
buf := make([]byte, 27)
buf[0] = byte((year/1000)%10) + '0'
buf[1] = byte((year/100)%10) + '0'
buf[2] = byte((year/10)%10) + '0'
buf[3] = byte(year%10) + '0'
buf[4] = '-'
buf[5] = byte((month)/10) + '0'
buf[6] = byte((month)%10) + '0'
buf[7] = '-'
buf[8] = byte((day)/10) + '0'
buf[9] = byte((day)%10) + '0'
buf[10] = 'T'
buf[11] = byte((hour)/10) + '0'
buf[12] = byte((hour)%10) + '0'
buf[13] = ':'
buf[14] = byte((minute)/10) + '0'
buf[15] = byte((minute)%10) + '0'
buf[16] = ':'
buf[17] = byte((second)/10) + '0'
buf[18] = byte((second)%10) + '0'
buf[19] = '.'
buf[20] = byte((micros/100000)%10) + '0'
buf[21] = byte((micros/10000)%10) + '0'
buf[22] = byte((micros/1000)%10) + '0'
buf[23] = byte((micros/100)%10) + '0'
buf[24] = byte((micros/10)%10) + '0'
buf[25] = byte((micros)%10) + '0'
buf[26] = 'Z'
enc.AppendString(string(buf))
}
func updateScopes(options *Options, core zapcore.Core, errSink zapcore.WriteSyncer) error {
// init the global I/O funcs
writeFn.Store(core.Write)
syncFn.Store(core.Sync)
errorSink.Store(errSink)
// snapshot what's there
allScopes := Scopes()
// update the output levels of all scopes
levels := strings.Split(options.outputLevels, ",")
for _, sl := range levels {
s, l, err := convertScopedLevel(sl)
if err != nil {
return err
}
if scope, ok := allScopes[s]; ok {
scope.SetOutputLevel(l)
} else {
return fmt.Errorf("unknown scope '%s' specified", s)
}
}
// update the stack tracing levels of all scopes
levels = strings.Split(options.stackTraceLevels, ",")
for _, sl := range levels {
s, l, err := convertScopedLevel(sl)
if err != nil {
return err
}
if scope, ok := allScopes[s]; ok {
scope.SetStackTraceLevel(l)
} else {
return fmt.Errorf("unknown scope '%s' specified", s)
}
}
// update the caller location setting of all scopes
sc := strings.Split(options.logCallers, ",")
for _, s := range sc {
if s == "" {
continue
}
if scope, ok := allScopes[s]; ok {
scope.SetLogCallers(true)
} else {
return fmt.Errorf("unknown scope '%s' specified", s)
}
}
return nil
}
// Configure initializes Istio's logging subsystem.
//
// You typically call this once at process startup.
// Once this call returns, the logging system is ready to accept data.
func Configure(options *Options) error {
core, captureCore, errSink, err := prepZap(options)
if err != nil {
return err
}
if err = updateScopes(options, core, errSink); err != nil {
return err
}
opts := []zap.Option{
zap.ErrorOutput(errSink),
zap.AddCallerSkip(1),
}
if defaultScope.GetLogCallers() {
opts = append(opts, zap.AddCaller())
}
l := defaultScope.GetStackTraceLevel()
if l != NoneLevel {
opts = append(opts, zap.AddStacktrace(levelToZap[l]))
}
captureLogger := zap.New(captureCore, opts...)
// capture global zap logging and force it through our logger
_ = zap.ReplaceGlobals(captureLogger)
// capture standard golang "log" package output and force it through our logger
_ = zap.RedirectStdLog(captureLogger)
// capture gRPC logging
if options.LogGrpc {
grpclog.SetLogger(zapgrpc.NewLogger(captureLogger.WithOptions(zap.AddCallerSkip(2))))
}
return nil
}
// reset by the Configure method
var syncFn atomic.Value
// Sync flushes any buffered log entries.
// Processes should normally take care to call Sync before exiting.
func Sync() error {
var err error
if s := syncFn.Load().(func() error); s != nil {
err = s()
}
return err
}