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log.go
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log.go
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// Copyright 2017 The Nakama Authors
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"os"
"fmt"
"path/filepath"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// By default, log all messages with Warn and Error messages to a log file inside Data/Log/<name>.log file. The content will be in JSON.
// if --verbose is passed, log messages with Debug and higher levels.
// if --logtostdout is passed, logs are only printed to stdout.
// In all cases, Error messages trigger the stacktrace to be dumped as well.
var (
VerboseLogging = true
StdoutLogging = false
)
type loggerEnabler struct{}
func (l *loggerEnabler) Enabled(level zapcore.Level) bool {
return VerboseLogging || level > zapcore.DebugLevel
}
func NewLogger(consoleLogger *zap.Logger, config Config) *zap.Logger {
output := os.Stdout
if !StdoutLogging {
err := os.MkdirAll(filepath.FromSlash(config.GetDataDir()+"/log"), 0755)
if err != nil {
consoleLogger.Fatal("Could not create log directory", zap.Error(err))
return nil
}
output, err = os.Create(filepath.FromSlash(fmt.Sprintf("%v/log/%v.log", config.GetDataDir(), config.GetName())))
if err != nil {
consoleLogger.Fatal("Could not create log file", zap.Error(err))
return nil
}
}
logger := NewJSONLogger(output)
logger = logger.With(zap.String("server", config.GetName()))
return logger
}
func NewConsoleLogger(output *os.File) *zap.Logger {
consoleEncoder := zapcore.NewConsoleEncoder(zapcore.EncoderConfig{
TimeKey: "ts",
LevelKey: "level",
NameKey: "logger",
CallerKey: "caller",
MessageKey: "msg",
StacktraceKey: "stacktrace",
EncodeLevel: zapcore.CapitalColorLevelEncoder,
EncodeTime: zapcore.ISO8601TimeEncoder,
EncodeDuration: zapcore.StringDurationEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
})
core := zapcore.NewCore(consoleEncoder, output, &loggerEnabler{})
options := []zap.Option{zap.AddStacktrace(zap.ErrorLevel)}
return zap.New(core, options...)
}
func NewJSONLogger(output *os.File) *zap.Logger {
jsonEncoder := zapcore.NewJSONEncoder(zapcore.EncoderConfig{
TimeKey: "ts",
LevelKey: "level",
NameKey: "logger",
CallerKey: "caller",
MessageKey: "msg",
StacktraceKey: "stacktrace",
EncodeLevel: zapcore.LowercaseLevelEncoder,
EncodeTime: zapcore.ISO8601TimeEncoder,
EncodeDuration: zapcore.StringDurationEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
})
core := zapcore.NewCore(jsonEncoder, output, &loggerEnabler{})
options := []zap.Option{zap.AddStacktrace(zap.ErrorLevel)}
return zap.New(core, options...)
}
func NewMultiLogger(loggers ...*zap.Logger) *zap.Logger {
cores := []zapcore.Core{}
for _, logger := range loggers {
cores = append(cores, logger.Core())
}
teeCore := zapcore.NewTee(cores...)
options := []zap.Option{zap.AddStacktrace(zap.ErrorLevel)}
return zap.New(teeCore, options...)
}