Ndtyjky

I am trying to put the same message to console and the log files at the same time with custom encoder for config. In the process I want to display the caller information but the same is not being displayed even if I have used caller key as suggested in the documentation. Below is the sample code for the same

package main



import (

    "os"

    "time"



    "go.uber.org/zap"

    "go.uber.org/zap/zapcore"

    "gopkg.in/natefinch/lumberjack.v2"

)



var logLevelSeverity = map[zapcore.Level]string{

    zapcore.DebugLevel:  "DEBUG",

    zapcore.InfoLevel:   "INFO",

    zapcore.WarnLevel:   "WARNING",

    zapcore.ErrorLevel:  "ERROR",

    zapcore.DPanicLevel: "CRITICAL",

    zapcore.PanicLevel:  "ALERT",

    zapcore.FatalLevel:  "EMERGENCY",

}



func SyslogTimeEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {

    enc.AppendString(t.Format("Jan 01, 2006  15:04:05"))

}



func CustomEncodeLevel(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {

    enc.AppendString(logLevelSeverity[level])

}



func CustomLevelFileEncoder(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {

    enc.AppendString("[" + logLevelSeverity[level] + "]")

}



func main() {



    w := zapcore.AddSync(&lumberjack.Logger{

        Filename:   "temp1.log",

        MaxSize:    1024,

        MaxBackups: 20,

        MaxAge:     28,

        Compress:   true,

    })



    //Define config for the console output

    cfgConsole := zapcore.EncoderConfig{

        MessageKey:   "message",

        LevelKey:     "severity",

        EncodeLevel:  CustomEncodeLevel,

        TimeKey:      "time",

        EncodeTime:   SyslogTimeEncoder,

        CallerKey:    "caller",

        EncodeCaller: zapcore.FullCallerEncoder,

    }

    cfgFile := zapcore.EncoderConfig{

        MessageKey:   "message",

        LevelKey:     "severity",

        EncodeLevel:  CustomLevelFileEncoder,

        TimeKey:      "time",

        EncodeTime:   SyslogTimeEncoder,

        CallerKey:    "caller",

        EncodeCaller: zapcore.FullCallerEncoder,

    }



    consoleDebugging := zapcore.Lock(os.Stdout)

    //consoleError := zapcore.Lock(os.Stderr)

    core := zapcore.NewTee(

        zapcore.NewCore(zapcore.NewConsoleEncoder(cfgFile), w, zap.DebugLevel),

        zapcore.NewCore(zapcore.NewJSONEncoder(cfgConsole), consoleDebugging, zap.DebugLevel),

        //zapcore.NewCore(zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()), consoleError, zap.ErrorLevel),

    )

    //core := zapcore.NewCore(zapcore.NewConsoleEncoder(encConsole), w, zap.DebugLevel)

    wlogger := zap.New(core)

    wlogger.Debug("Sample debug for log file and console")

    wlogger.Warn("An warning message example")

    wlogger.Info("An info level message")

    coreFile := zapcore.NewCore(zapcore.NewConsoleEncoder(cfgFile), w, zap.DebugLevel)

    flogger := zap.New(coreFile)

    flogger.Debug("An exclusive message for file")

    //output

    //{"severity":"DEBUG","time":"Nov 11, 2018  20:24:11","message":"Sample debug for log file and console"}

    //{"severity":"WARNING","time":"Nov 11, 2018  20:24:11","message":"An warning message example"}

    //{"severity":"INFO","time":"Nov 11, 2018  20:24:11","message":"An info level message"}

}

Any thoughts why the caller information is not being displayed.

according to documentation https://godoc.org/go.uber.org/zap#AddCaller
you can do something like this on logger creation:

wlogger := zap.New(core, zap.AddCaller())

update answer to comment

also you can define your implementation of caller encode:

func MyCaller(caller zapcore.EntryCaller, enc zapcore.PrimitiveArrayEncoder) {

    enc.AppendString(filepath.Base(caller.FullPath()))

}

and pass it to cfgConsole and cfgFile