聊聊dubbo-go-proxy的loggerFilter

序

本文主要研究一下dubbo-go-proxy的loggerFilter

loggerFilter

dubbo-go-proxy/pkg/filter/logger/logger.go

// nolint
func Init() {
	extension.SetFilterFunc(constant.LoggerFilter, loggerFilterFunc())
}

func loggerFilterFunc() context.FilterFunc {
	return New().Do()
}

// loggerFilter is a filter for simple logger.
type loggerFilter struct {
}

// New create logger filter.
func New() filter.Filter {
	return &loggerFilter{}
}

loggerFilter的Init方法往extension設置了loggerFilterFunc，該context.FilterFunc執行loggerFilter的Do方法

Do

dubbo-go-proxy/pkg/filter/logger/logger.go

// Logger logger filter, print url and latency
func (f loggerFilter) Do() context.FilterFunc {
	return func(c context.Context) {
		start := time.Now()

		c.Next()

		latency := time.Now().Sub(start)

		logger.Infof("[dubboproxy go] [UPSTREAM] receive request | %d | %s | %s | %s | ", c.StatusCode(), latency, c.GetMethod(), c.GetUrl())
	}
}

Do方法先記錄下start，之後執行c.Next()，最後計算latency，最後打印下日誌，輸出status code，latency、method、url

小結

dubbo-go-proxy的loggerFilter的Init方法往extension設置了loggerFilterFunc，該context.FilterFunc執行loggerFilter的Do方法；Do方法先記錄下start，之後執行c.Next()，最後計算latency，最後打印下日誌，輸出status code，latency、method、url。

doc

• dubbo-go-proxy