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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