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zap_handler.go
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/
zap_handler.go
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// Copyright © 2021 The Things Network Foundation, The Things Industries B.V.
//
// 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 log
import (
"os"
"sort"
"strconv"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// NewZap returns a new log handler based on the zap library.
func NewZap(encoding string) (Handler, error) {
config := zap.Config{
Level: zap.NewAtomicLevelAt(zap.DebugLevel), // levels are currently still filtered by the Logger.
Encoding: encoding,
EncoderConfig: zap.NewProductionEncoderConfig(),
OutputPaths: []string{"stderr"},
ErrorOutputPaths: []string{"stderr"},
}
config.DisableCaller = true // omit caller from log message.
config.EncoderConfig.TimeKey = "" // omit timestamp from log message.
if encoding == "console" {
config.EncoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
colorterm, _ := strconv.ParseBool(os.Getenv("COLORTERM"))
if !colorterm && os.Getenv("COLORTERM") == "truecolor" {
colorterm = true
}
if colorterm {
config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
}
}
logger, err := config.Build()
if err != nil {
return nil, err
}
return &zapHandler{Logger: logger}, nil
}
type zapHandler struct {
*zap.Logger
}
func (h *zapHandler) HandleLog(e Entry) error {
var logFunc func(msg string, fields ...zap.Field)
switch e.Level() {
case DebugLevel:
logFunc = h.Logger.Debug
case InfoLevel:
logFunc = h.Logger.Info
case WarnLevel:
logFunc = h.Logger.Warn
case ErrorLevel:
logFunc = h.Logger.Error
case FatalLevel:
logFunc = h.Logger.Fatal
default:
return nil
}
logFields := e.Fields().Fields()
var fieldNames []string
for k := range logFields {
fieldNames = append(fieldNames, k)
}
sort.Strings(fieldNames)
var zapFields []zap.Field
for _, k := range fieldNames {
zapFields = append(zapFields, zap.Any(k, logFields[k]))
}
logFunc(e.Message(), zapFields...)
return nil
}