/
log.go
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/
log.go
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// Copyright 2020 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 logutil
import (
"bytes"
"context"
"io"
"os"
"strconv"
"strings"
"github.com/IBM/sarama"
"github.com/gin-gonic/gin"
"github.com/go-sql-driver/mysql"
"github.com/pingcap/errors"
"github.com/pingcap/log"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"google.golang.org/grpc/grpclog"
)
// globalP is the global ZapProperties in log
var globalP *log.ZapProperties
const (
defaultLogLevel = "info"
defaultLogMaxDays = 7
defaultLogMaxSize = 512 // MB
)
// Config serializes log related config in toml/json.
type Config struct {
// Log level.
Level string `toml:"level" json:"level"`
// Log filename, leave empty to disable file log.
File string `toml:"file" json:"file"`
// Max size for a single file, in MB.
FileMaxSize int `toml:"max-size" json:"max-size"`
// Max log keep days, default is never deleting.
FileMaxDays int `toml:"max-days" json:"max-days"`
// Maximum number of old log files to retain.
FileMaxBackups int `toml:"max-backups" json:"max-backups"`
// ZapInternalErrOutput specify where the internal error of zap logger should be send to.
ZapInternalErrOutput string `toml:"error-output" json:"error-output"`
}
// Adjust adjusts config
func (cfg *Config) Adjust() {
if len(cfg.Level) == 0 {
cfg.Level = defaultLogLevel
}
if cfg.Level == "warning" {
cfg.Level = "warn"
}
if cfg.FileMaxSize == 0 {
cfg.FileMaxSize = defaultLogMaxSize
}
if cfg.FileMaxDays == 0 {
cfg.FileMaxDays = defaultLogMaxDays
}
}
// SetLogLevel changes TiCDC log level dynamically.
func SetLogLevel(level string) error {
oldLevel := log.GetLevel()
if strings.EqualFold(oldLevel.String(), level) {
return nil
}
var lv zapcore.Level
err := lv.UnmarshalText([]byte(level))
if err != nil {
return errors.Trace(err)
}
log.SetLevel(lv)
return nil
}
// loggerOp is the op for logger control
type loggerOp struct {
isInitGRPCLogger bool
isInitSaramaLogger bool
isInitMySQLLogger bool
output zapcore.WriteSyncer
}
func (op *loggerOp) applyOpts(opts []LoggerOpt) {
for _, opt := range opts {
opt(op)
}
}
// LoggerOpt is the logger option
type LoggerOpt func(*loggerOp)
// WithInitGRPCLogger enables grpc logger initialization when initializes global logger
func WithInitGRPCLogger() LoggerOpt {
return func(op *loggerOp) {
op.isInitGRPCLogger = true
}
}
// WithInitSaramaLogger enables sarama logger initialization when initializes global logger
func WithInitSaramaLogger() LoggerOpt {
return func(op *loggerOp) {
op.isInitSaramaLogger = true
}
}
// WithInitMySQLLogger enables mysql logger initialization when initializes global logger
func WithInitMySQLLogger() LoggerOpt {
return func(op *loggerOp) {
op.isInitMySQLLogger = true
}
}
// WithOutputWriteSyncer will replace the WriteSyncer of global logger with customized WriteSyncer
// Easy for test when using zaptest.Buffer as WriteSyncer
func WithOutputWriteSyncer(output zapcore.WriteSyncer) LoggerOpt {
return func(op *loggerOp) {
op.output = output
}
}
// InitLogger initializes logger
func InitLogger(cfg *Config, opts ...LoggerOpt) error {
var op loggerOp
op.applyOpts(opts)
pclogConfig := &log.Config{
Level: cfg.Level,
File: log.FileLogConfig{
Filename: cfg.File,
MaxSize: cfg.FileMaxSize,
MaxDays: cfg.FileMaxDays,
MaxBackups: cfg.FileMaxBackups,
},
ErrorOutputPath: cfg.ZapInternalErrOutput,
}
var lg *zap.Logger
var err error
if op.output == nil {
lg, globalP, err = log.InitLogger(pclogConfig)
} else {
lg, globalP, err = log.InitLoggerWithWriteSyncer(pclogConfig, op.output, nil)
}
if err != nil {
return err
}
// Do not log stack traces at all, as we'll get the stack trace from the
// error itself.
lg = lg.WithOptions(zap.AddStacktrace(zap.DPanicLevel))
log.ReplaceGlobals(lg, globalP)
return initOptionalComponent(&op, cfg)
}
// initOptionalComponent initializes some optional components
func initOptionalComponent(op *loggerOp, cfg *Config) error {
var level zapcore.Level
if op.isInitGRPCLogger || op.isInitSaramaLogger {
err := level.UnmarshalText([]byte(cfg.Level))
if err != nil {
return errors.Trace(err)
}
}
if op.isInitGRPCLogger {
if err := initGRPCLogger(level); err != nil {
return err
}
}
if op.isInitSaramaLogger {
if err := initSaramaLogger(level); err != nil {
return err
}
}
if op.isInitMySQLLogger {
if err := initMySQLLogger(); err != nil {
return err
}
}
return nil
}
// ZapErrorFilter wraps zap.Error, if err is in given filterErrors, it will be set to nil
func ZapErrorFilter(err error, filterErrors ...error) zap.Field {
cause := errors.Cause(err)
for _, ferr := range filterErrors {
if cause == ferr {
return zap.Error(nil)
}
}
return zap.Error(err)
}
// initMySQLLogger setup logger used in mysql lib
func initMySQLLogger() error {
// MySQL lib only prints error logs.
level := zapcore.ErrorLevel
logger, err := zap.NewStdLogAt(log.L().With(zap.String("component", "[mysql]")), level)
if err != nil {
return errors.Trace(err)
}
return mysql.SetLogger(logger)
}
// initSaramaLogger hacks logger used in sarama lib
func initSaramaLogger(level zapcore.Level) error {
// only available less than info level
if !zapcore.InfoLevel.Enabled(level) {
logger, err := zap.NewStdLogAt(log.L().With(zap.String("component", "sarama")), level)
if err != nil {
return errors.Trace(err)
}
sarama.Logger = logger
}
return nil
}
type loggerWriter struct {
logFunc func(msg string, fields ...zap.Field)
}
func (l *loggerWriter) Write(p []byte) (int, error) {
p = bytes.TrimSpace(p)
l.logFunc(string(p))
return len(p), nil
}
func levelToFunc(logger *zap.Logger, level zapcore.Level) (func(string, ...zap.Field), error) {
switch level {
case zap.DebugLevel:
return logger.Debug, nil
case zap.InfoLevel:
return logger.Info, nil
case zap.WarnLevel:
return logger.Warn, nil
case zap.ErrorLevel:
return logger.Error, nil
case zap.DPanicLevel:
return logger.DPanic, nil
case zap.PanicLevel:
return logger.Panic, nil
case zap.FatalLevel:
return logger.Fatal, nil
}
return nil, errors.Errorf("unrecognized level: %q", level)
}
func initGRPCLogger(level zapcore.Level) error {
// Inherit Golang gRPC verbosity setting.
// https://github.com/grpc/grpc-go/blob/v1.26.0/grpclog/loggerv2.go#L134-L138
var v int
vLevel := os.Getenv("GRPC_GO_LOG_VERBOSITY_LEVEL")
if vl, err := strconv.Atoi(vLevel); err == nil {
v = vl
}
if v <= 0 && level.Enabled(zapcore.ErrorLevel) {
// Sometimes gRPC log is very verbose.
level = zapcore.ErrorLevel
return nil
}
logger := log.L().With(zap.String("component", "grpc"))
// For gRPC 1.26.0, logging call stack:
//
// github.com/pingcap/tiflow/pkg/util.levelToFunc.func1
// github.com/pingcap/tiflow/pkg/util.(*grpcLoggerWriter).Write
// log.(*Logger).Output
// log.(*Logger).Printf
// google.golang.org/grpc/grpclog.(*loggerT).Infof
// google.golang.org/grpc/grpclog.Infof(...)
// Caller
logger = logger.WithOptions(zap.AddCallerSkip(5))
logFunc, err := levelToFunc(logger, level)
if err != nil {
return err
}
writer := &loggerWriter{logFunc: logFunc}
grpclog.SetLoggerV2(grpclog.NewLoggerV2WithVerbosity(writer, writer, writer, v))
return nil
}
// ErrorFilterContextCanceled log the msg and fields but do nothing if fields have cancel error
func ErrorFilterContextCanceled(logger *zap.Logger, msg string, fields ...zap.Field) {
for _, field := range fields {
switch field.Type {
case zapcore.StringType:
if field.Key == "error" && strings.Contains(field.String, context.Canceled.Error()) {
return
}
case zapcore.ErrorType:
err, ok := field.Interface.(error)
if ok && errors.Cause(err) == context.Canceled {
return
}
}
}
logger.WithOptions(zap.AddCallerSkip(1)).Error(msg, fields...)
}
// ShortError contructs a field which only records the error message without the
// verbose text (i.e. excludes the stack trace).
func ShortError(err error) zap.Field {
if err == nil {
return zap.Skip()
}
return zap.String("error", err.Error())
}
// WithComponent return a logger with specified component scope
func WithComponent(component string) *zap.Logger {
return log.L().With(zap.String("component", component))
}
// InitGinLogWritter initialize loggers for Gin.
func InitGinLogWritter() io.Writer {
currentLevel := log.GetLevel()
if currentLevel == zapcore.DebugLevel {
gin.SetMode(gin.DebugMode)
} else {
gin.SetMode(gin.ReleaseMode)
}
logger := WithComponent("gin")
logFunc, _ := levelToFunc(logger, currentLevel)
gin.DefaultWriter = &loggerWriter{logFunc: logFunc}
logFunc, _ = levelToFunc(logger, zapcore.ErrorLevel)
gin.DefaultErrorWriter = &loggerWriter{logFunc: logFunc}
return gin.DefaultErrorWriter
}