logger/loki.go

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package logger
import (
"encoding/json"
"errors"
"fmt"
"github.com/go-kit/kit/log"
"github.com/lixh00/loki-client-go/loki"
"github.com/prometheus/common/model"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"time"
)
// Loki连接对象
var lokiClient *loki.Client
// 日志输出
type lokiWriter struct{}
// 初始化LokiCore使日志可以推送到Loki
func initLokiCore() zapcore.Core {
initLokiClient()
// 日志输出到控制台和Loki
writer := zapcore.AddSync(newLokiWriter())
// 自定义时间输出格式
customTimeEncoder := func(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
enc.AppendString(t.Format("2006-01-02 15:04:05.000"))
}
// 格式相关的配置
encoderConfig := zap.NewProductionEncoderConfig()
// 修改时间戳的格式
encoderConfig.EncodeTime = customTimeEncoder
// 日志级别使用大写
encoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
// 将日志级别设置为 DEBUG
return zapcore.NewCore(zapcore.NewJSONEncoder(encoderConfig), writer, zapcore.DebugLevel)
}
// 初始化LokiClient
func initLokiClient() {
// 如果Loki配置错误返回一个nil
if config.LokiHost == "" || config.LokiPort < 1 {
panic(errors.New("Loki配置错误"))
}
// 初始化配置
cfg, _ := loki.NewDefaultConfig(config.getLokiPushURL())
// 创建连接对象
client, err := loki.NewWithLogger(cfg, log.NewNopLogger())
if err != nil {
panic("Loki初始化失败: " + err.Error())
}
lokiClient = client
}
// 实现Write接口使lokiClient可以作为zap的扩展
func (c lokiWriter) Write(p []byte) (int, error) {
type logInfo struct {
Level string `json:"level"` // 日志级别
Ts string `json:"ts"` // 格式化后的时间(在zap那边配置的)
Caller string `json:"caller"` // 日志输出的文件名和行号
Msg string `json:"msg"` // 日志内容
}
var li logInfo
err := json.Unmarshal(p, &li)
if err != nil {
return 0, err
}
label := model.LabelSet{"job": model.LabelValue(config.LokiJob)}
label["source"] = model.LabelValue(config.LokiSource)
label["level"] = model.LabelValue(li.Level)
label["caller"] = model.LabelValue(li.Caller)
// 异步推送消息到服务器
go func() {
if err = lokiClient.Handle(label, time.Now().Local(), li.Msg); err != nil {
fmt.Printf("日志推送到Loki失败: %v\n", err.Error())
}
}()
return 0, nil
}
// NewLokiWriter
func newLokiWriter() *lokiWriter {
return &lokiWriter{}
}