log

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 Go to latest Published: Feb 27, 2022 License: CC0-1.0 Imports: 6 Imported by: 0

README

TDK Log

TDK Log is based on Zerolog log package. The logger is fully compatible with tokopedia log platform.

Log Configuration

The logger package can be used directly without needing of any configuration. But we still provide configuration mechanism for flexibility

Configuration

Field Type Description
AppName string application name, needed by log server for easy filtering
Level string specify log level (default:debug)
LogFile string specify output file for infoLevel - fatalLevel log (default: no file)
DebugFile string specify output file for debugLevel log (default: no file)
TimeFormat string specify time format (default:RFC3339="2006-01-02T15:04:05Z07:00")
Caller bool print caller position or not (default=false)
UseJSON bool print log in json format (default=false)

We only need SetConfig func to configure the log. The func is not thread safe, only call it when initializing the app.

import "github.com/kodekoding/phastos/go/log"

func main() {
    err := log.SetConfig(&log.Config{
        Level:     "info", // default is info
        AppName: "my_cool_app",
        LogFile:   "logfile.log",
        DebugFile: "debugfile.log",
    })
    if err != nil {
        log.Fatal(err)
    }
    log.Info("this is a log")
}
Deprecated behaviours

Below are other behaviours which previously configurable

  • Colored console format if TKPENV=development

That config field still exists, but won't take effect. It still exists to not break current code.

Log level

Log level is supported in the logger, available log level is:

  • debug
  • info
  • warning
  • error
  • fatal

The log is disabled if LogLevel < CurrentLogLevel. For example, the Debug log is disabled when the current level is Info.

Log of Old TDK app (generated by tkp command)

If your app is generated using tkp, the default is slightly different because tdk/app overrides this. Check it in here

Advanced Customization (deprecated)

You won't need below funcs most of the time. It is provided for flexibility.

IMPORTANT NOTE: the functions in this section are not thread safe, call them when initializing the application.

1. Change Log Level

You can set log level using SetLevel or SetLevelString.

Example of SetLevel:

import "github.com/kodekoding/phastos/go/log"

func main() {
    log.SetLevel(log.InfoLevel)
    log.Info("this is a log")
}

Example of SetLevelString (use lowercase)

import "github.com/kodekoding/phastos/go/log"

func main() {
    log.SetLevelString("info")
    log.Info("this is a log")
}
2. Change logger

If you want even more flexible configuration, you can set the logger per level by yourself using SetLogger
Note: your custom logger will be replaced if you call SetConfig after SetLogger

example: set separate output file for errorLevel and fatalLevel log

import "github.com/kodekoding/phastos/go/log"
import "github.com/kodekoding/phastos/go/log/logger"

func main() {
    errLogger, err := log.NewLogger(log.Zerolog, &logger.Config{
        Level:   log.DebugLevel,
        LogFile: "error.log",
    })
    if err != nil {
        panic(err)
    }
    err = log.SetLogger(log.ErrorLevel, errLogger)
    if err != nil {
        panic(err)
    }
    err = log.SetLogger(log.FatalLevel, errLogger)
    if err != nil {
        panic(err)
    }
    log.Error("this is a log")
}

Available function

Each level has 3 function:

  • unformatted -> like Println in standard log
  • formatted -> like Printf in standard log
  • with map[string]interface{} (or log.KV)

We also add several functions to ease the migration to tdk log. Function list and example:

arg1 := "hello"
arg2 := "world"

log.Debug(arg1, arg2)
log.Debugln(arg1, arg2)
log.Debugf("message %v %v", arg1, arg2)
log.DebugWithFields("message", log.KV{"arg1":arg1, "arg2":arg2})

log.Info(arg1, arg2)
log.Infoln(arg1, arg2)
log.Infof("message %v %v", arg1, arg2)
log.InfoWithFields("message", log.KV{"arg1":arg1, "arg2":arg2})

// alias for Info
log.Print(arg1, arg2)
// alias for Infoln
log.Println(arg1, arg2)
// alias for Infof
log.Printf("message %v %v", arg1, arg2)

log.Warn(arg1, arg2)
log.Warnln(arg1, arg2)
log.Warnf("message %v %v", arg1, arg2)
log.WarnWithFields("message", log.KV{"arg1":arg1, "arg2":arg2})

log.Error(arg1, arg2)
log.Errorln(arg1, arg2)
log.Errorf("message %v %v", arg1, arg2)
log.ErrorWithFields("message", log.KV{"arg1":arg1, "arg2":arg2})

log.Fatal(arg1, arg2)
log.Fatalln(arg1, arg2)
log.Fatalf("message %v %v", arg1, arg2)
log.FatalWithFields("message", log.KV{"arg1":arg1, "arg2":arg2})

Output example:

2019-03-08 17:16:48+07:00 DBG log_test.go:35 > helloworld
2019-03-08 17:16:48+07:00 DBG log_test.go:35 > hello world
2019-03-08 17:16:48+07:00 DBG log_test.go:36 > message hello world
2019-03-08 17:16:48+07:00 DBG log_test.go:37 > message arg1=hello arg2=world
2019-03-08 17:16:48+07:00 INF log_test.go:39 > helloworld
2019-03-08 17:16:48+07:00 INF log_test.go:39 > hello world
2019-03-08 17:16:48+07:00 INF log_test.go:40 > message hello world
2019-03-08 17:16:48+07:00 INF log_test.go:41 > message arg1=hello arg2=world
2019-03-08 17:16:48+07:00 INF log_test.go:44 > helloworld
2019-03-08 17:16:48+07:00 INF log_test.go:45 > hello world
2019-03-08 17:16:48+07:00 INF log_test.go:47 > message hello world
2019-03-08 17:16:48+07:00 WRN log_test.go:49 > helloworld
2019-03-08 17:16:48+07:00 WRN log_test.go:49 > hello world
2019-03-08 17:16:48+07:00 WRN log_test.go:50 > message hello world
2019-03-08 17:16:48+07:00 WRN log_test.go:51 > message arg1=hello arg2=world
2019-03-08 17:16:48+07:00 ERR log_test.go:53 > helloworld
2019-03-08 17:16:48+07:00 ERR log_test.go:53 > hello world
2019-03-08 17:16:48+07:00 ERR log_test.go:54 > message hello world
2019-03-08 17:16:48+07:00 ERR log_test.go:55 > message arg1=hello arg2=world
2019-03-08 17:16:48+07:00 FTL log_test.go:57 > helloworld
2019-03-08 17:16:48+07:00 FTL log_test.go:57 > hello world
2019-03-08 17:16:48+07:00 FTL log_test.go:57 > message hello world
2019-03-08 17:16:48+07:00 FTL log_test.go:57 > message arg1=hello arg2=world

Integration with TDK Error package

TDK error package has a features called errors.Fields. This fields can be used to add more context into the error, and then we can print the fields when needed. TDK log will automatically print the fields if error = tdkerrors.Error by using log.Errors. For example:

import "github.com/kodekoding/phastos/go/log"
import "github.com/tokopedia/tdk/x/go/errors"

func main() {
    err := errors.E("this is an error", errors.Fields{"field1":"value1"})
    log.Errors(err)
}

// result is
// message=this is an error field1=value1

Documentation

Index

Constants

View Source 
const (
	TraceLevel = logger.TraceLevel
	DebugLevel = logger.DebugLevel
	InfoLevel  = logger.InfoLevel
	WarnLevel  = logger.WarnLevel
	ErrorLevel = logger.ErrorLevel
	FatalLevel = logger.FatalLevel
)

Level option

View Source 
const (
	RFC3339Milli = "2006-01-02T15:04:05.999Z07:00"
)

RFC3339Milli We agree that we want a millisecond precisstion, sadly in golang it's not there. https://github.com/golang/go/issues/13291

Variables

This section is empty.

Functions

func Debug 

func Debug(args ...interface{})

Debug prints debug level log like log.Print

func DebugWithFields 

func DebugWithFields(msg string, fields KV)

DebugWithFields prints debug level log with additional fields. useful when output is in json format

func Debugf 

func Debugf(format string, v ...interface{})

Debugf prints debug level log like log.Printf

func Debugln 

func Debugln(args ...interface{})

Debugln prints debug level log like log.Println

func Debugw 

func Debugw(msg string, keyValues KV)

Debugw prints debug level log with additional fields. Deprecated: use DebugWithFields

func Error 

func Error(args ...interface{})

Error prints error level log like log.Print

func ErrorWithFields 

func ErrorWithFields(msg string, fields KV)

ErrorWithFields prints error level log with additional fields. useful when output is in json format

func Errorf 

func Errorf(format string, v ...interface{})

Errorf prints error level log like log.Printf

func Errorln 

func Errorln(args ...interface{})

Errorln prints error level log like log.Println

func Errors 

func Errors(err error)

Errors can handle error from tdk/x/go/errors package

func Errorw 

func Errorw(msg string, keyValues KV)

Errorw prints error level log with additional fields. Deprecated: use ErrorWithFields

func Fatal 

func Fatal(args ...interface{})

Fatal prints fatal level log like log.Print

func FatalWithFields 

func FatalWithFields(msg string, fields KV)

FatalWithFields prints fatal level log with additional fields. useful when output is in json format

func Fatalf 

func Fatalf(format string, v ...interface{})

Fatalf prints fatal level log like log.Printf

func Fatalln 

func Fatalln(args ...interface{})

Fatalln prints fatal level log like log.Println

func Fatalw 

func Fatalw(msg string, keyValues KV)

Fatalw prints fatal level log with additional fields. Deprecated: use FatalWithFields

func GetCtxID 

func GetCtxID(ctx context.Context) string

GetCtxID get request id from context

func GetCtxRequestID 

func GetCtxRequestID(ctx context.Context) string

GetCtxRequestID get request id from context

func Info 

func Info(args ...interface{})

Info prints info level log like log.Print

func InfoWithFields 

func InfoWithFields(msg string, fields KV)

InfoWithFields prints info level log with additional fields. useful when output is in json format

func Infof 

func Infof(format string, v ...interface{})

Infof prints info level log like log.Printf

func Infoln 

func Infoln(args ...interface{})

Infoln prints info level log like log.Println

func Infow 

func Infow(msg string, keyValues KV)

Infow prints info level log with additional fields. Deprecated: use InfoWithFields

func InitLogContext 

func InitLogContext(ctx context.Context) context.Context

InitLogContext will initialize context with some informations Currently it will inject request id using xid Ideally InitLogContext will be wrap around middleware, either grpc or http For Request ID will currently set it with xid if empty. Can be explored with trace id

func Print 

func Print(v ...interface{})

Print info level log like log.Print

func Printf 

func Printf(format string, v ...interface{})

Printf info level log like log.Printf

func Println 

func Println(v ...interface{})

Println info level log like log.Println

func SetConfig 

func SetConfig(config *Config) error

SetConfig creates new logger based on given config

func SetCtxID 

func SetCtxID(ctx context.Context, contextID string) context.Context

SetCtxID set context with context it

func SetCtxRequestID 

func SetCtxRequestID(ctx context.Context, uuid string) context.Context

SetCtxRequestID set context with request id

func SetLevel 

func SetLevel(level Level)

SetLevel adjusts log level threshold. Only log with level higher or equal with this level will be printed

func SetLevelString 

func SetLevelString(level string)

SetLevelString adjusts log level threshold using string

func SetLogger 

func SetLogger(level logger.Level, lgr logger.Logger) error

SetLogger for certain level

func SetStdLog 

func SetStdLog(config *Config) error

SetStdLog will be the entry point for tdk logging library to make sure all Tokopedia services have the same log structures. The general specification will be JSON, request id, context id, metadata, error and message. For more specifications please go to https://tokopedia.atlassian.net/wiki/spaces/EN/pages/694817819/Logging+Format+Standardization

func StdDebug 

func StdDebug(ctx context.Context, metadata interface{}, err error, message string)

StdDebug print trace level log with standardized parameters.

func StdDebugf 

func StdDebugf(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdDebugf print trace level log with standardized parameters with formatter.

func StdError 

func StdError(ctx context.Context, metadata interface{}, err error, message string)

StdError print trace level log with standardized parameters.

func StdErrorf 

func StdErrorf(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdErrorf print trace level log with standardized parameters with formatter.

func StdFatal 

func StdFatal(ctx context.Context, metadata interface{}, err error, message string)

StdFatal print trace level log with standardized parameters.

func StdFatalf 

func StdFatalf(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdFatalf print trace level log with standardized parameters with formatter.

func StdInfo 

func StdInfo(ctx context.Context, metadata interface{}, err error, message string)

StdInfo print trace level log with standardized parameters.

func StdInfof 

func StdInfof(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdInfof print trace level log with standardized parameters with formatter.

func StdTrace 

func StdTrace(ctx context.Context, metadata interface{}, err error, message string)

StdTrace print trace level log with standardized parameters.

func StdTracef 

func StdTracef(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdTracef print trace level log with standardized parameters with formatter.

func StdWarn 

func StdWarn(ctx context.Context, metadata interface{}, err error, message string)

StdWarn print trace level log with standardized parameters.

func StdWarnf 

func StdWarnf(ctx context.Context, metadata interface{}, err error, format string, args ...interface{})

StdWarnf print trace level log with standardized parameters with formatter.

func Warn 

func Warn(args ...interface{})

Warn prints warn level log like log.Print

func WarnWithFields 

func WarnWithFields(msg string, fields KV)

WarnWithFields prints warn level log with additional fields. useful when output is in json format

func Warnf 

func Warnf(format string, v ...interface{})

Warnf prints warn level log like log.Printf

func Warnln 

func Warnln(args ...interface{})

Warnln prints warn level log like log.Println

func Warnw 

func Warnw(msg string, keyValues KV)

Warnw prints warn level log with additional fields. Deprecated: use WarnWithFields

Types

type Config 

type Config struct {
	// log level, default: debug
	Level string

	// Format of the log's time field
	// default RFC3339="2006-01-02T15:04:05Z07:00"
	TimeFormat string

	// AppName is the application name this log belong to
	AppName string

	// Caller, option to print caller line numbers.
	// make sure you understand the overhead when use this
	Caller bool

	// LogFile is output file for log other than debug log
	// this is not needed by default,
	// application is expected to run in containerized environment
	LogFile string

	// DebugFile is output file for debug log
	// this is not needed by default,
	// application is expected to run in containerized environment
	DebugFile string

	// Deprecated, this field will have no effect
	// keeping it for backward compatibility
	Engine Engine

	// UseColor, option to colorize log in console.
	// Deprecated true if and only if TKPENV=development
	UseColor bool

	// UseJSON, option to print in json format.
	UseJSON bool

	// StdLog, option to use standardized Log
	StdLog bool

	// CallerSkip, option to skip caller frame
	CallerSkip int
}

Config of log

type Engine 

type Engine = logger.Engine

Engine of logger. Deprecated, there is only 1 engine now 

const Logrus Engine = logger.Logrus

Logrus engine. Deprecated, logrus engine is dropped, use zerolog engine instead 

const Zerolog Engine = logger.Zerolog

Zerolog engine

type KV 

type KV = logger.KV

KV is a type for passing more fields information

type Level 

type Level = logger.Level

Level of log

type Logger 

type Logger = logger.Logger

Logger interface

func NewLogger 

func NewLogger(engine Engine, config *logger.Config) (Logger, error)

NewLogger creates a new zerolog logger. Engine parameter is not used anymore.

Source Files

View all Source files

Directories

Path Synopsis
zerolog

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