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Version: v1.3.22 Latest Latest

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Published: Jun 28, 2021 License: MIT Imports: 7 Imported by: 6



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an enhancement for logrus. logex attaches the context caller info to the logging output.

Since v1.2.0, logex allows switching the logging backends (such as logrus, zap, ...) transparently.




Build logger transparently

We provide the ability to switch logging backends transparently now.

A sample config file looks like:


  # runmode: devel  # devel, prod

    # The field 'level' will be reset to "debug" while the app is started up within a debugger
    # available values are:
    #   "disable"/"off", "panic", "fatal", "error", "warn", "info", "debug", "trace"
    level:  info
    format: text                  # text, json, logfmt, ...
    backend: sugar                # zap, sugar(sugared-zap) or logrus
    target: file                  # console, file
    directory: /var/log/$APPNAME

Load it to Config structure:

import "github.com/hedzr/log"
var config *log.LoggerConfig = log.NewLoggerConfig()
// ...

And build the backend:

import "github.com/hedzr/logex/build"
logger := build.New(config)
logger.Debugf("int value = %v", intVal)
Or build a logger backend directly
import "github.com/hedzr/logex/logx/logrus"
logrus.New(level string, traceMode, debugMode bool, opts ...Opt)

import "github.com/hedzr/logex/logx/zap"
zap.New(level string, traceMode, debugMode bool, opts ...Opt)

import "github.com/hedzr/logex/logx/zap/sugar"
sugar.New(level string, traceMode, debugMode bool, opts ...Opt)

Or, build the logger with pure go codes
import "github.com/hedzr/logex/build"
// config:=build.NewLoggerConfig()
config := build.NewLoggerConfigWith(true, "logrus", "debug")
logger := build.New(config)
logger.Debugf("int value = %v", intVal)

That's all stocked.

Integrating your backend:

You can wrap a logging backend with log.Logger and register it into logex/build. Why we should do it like this? A universal logger creating interface from logex/build will simplify the application initiliazing coding, esp. in a framework.

import "github.com/hedzr/logex/build"

build.RegisterBuilder("someone", createSomeLogger)

func createSomeLogger(config *log.LoggerConfig) log.Logger {
	//... wrapping your logging backend to log.Logger

// and use it:
build.New(build.NewLoggerConfigWith(true, "someone", "debug"))
build.New(build.NewLoggerConfigWith(false, "someone", "info"))
Legacy tools
Enable logrus
import "github.com/hedzr/logex"

func init(){
    // Or:
Ignore the extra caller frames

If you are writing logging func wrappers, you might ignore the extra caller frames for those wrappers:

func wrong(err error, fmt string, args interface{}) {
        logex.SKIP: 1,  // ignore wrong() frame
    }).Errorf(fmt, args)

func wrongInner(err error, fields logrus.Fields, fmt string, args interface{}) {
    logrus.WithError(err).WithFields(fields).Errorf(fmt, args)

func wrongwrong(err error, fmt string, args interface{}) {
    wrongInner(err, logrus.Fields{
        logex.SKIP: 2,  // ignore wrongwrong() and wrongInner() frame
    }, fmt, args...)

For go test

make logrus works in go test

The codes is copied from:


And in a test function, you could code now:

   func TestFoo(t *testing.T) {
     defer logex.CaptureLog(t).Release()
     // …



FOSSA Status



Package logex is a logging helper library which append the context call info to logging output for locating



View Source
const (
	// AppName const
	AppName = "logex"
	// Version const
	Version = "1.3.22"
	// VersionInt const
	VersionInt = 0x010316
View Source
const SKIP = formatter.SKIP

SKIP is a constant key Deprecated it's obsoleted


This section is empty.


func Enable

func Enable()

Enable makes logrus logging enabled. Deprecated it's obsoleted

func EnableWith added in v1.0.3

func EnableWith(lvl log.Level, opts ...Option)

EnableWith makes logrus logging enabled. Deprecated it's obsoleted

func GetDebugMode added in v1.2.0

func GetDebugMode() bool

GetDebugMode return the debug boolean flag generally

func GetLevel

func GetLevel() log.Level

GetLevel returns the current logging level in log/logex subsystem

func GetTraceMode added in v1.2.0

func GetTraceMode() bool

GetTraceMode return the trace boolean flag generally

func InDebugging added in v1.2.0

func InDebugging() bool

InDebugging check if the delve debugger presents

func SetDebugMode added in v1.2.0

func SetDebugMode(b bool)

SetDebugMode set the debug boolean flag generally

func SetTraceMode added in v1.2.0

func SetTraceMode(b bool)

SetTraceMode set the trace boolean flag generally

func SetupLoggingFormat added in v1.1.9

func SetupLoggingFormat(format string, logexSkipFrames int)

SetupLoggingFormat specify logrus logging configurations. Deprecated it's obsoleted


type LogCapturer added in v1.0.1

type LogCapturer interface {

LogCapturer reroutes testing.T log output

func CaptureLog added in v1.0.1

func CaptureLog(tb testing.TB) LogCapturer

CaptureLog redirects logrus output to testing.Log

type Option added in v1.1.9

type Option func()

Option specify option function. Deprecated it's obsoleted


Path Synopsis

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