Logging with trace ID from header

[vuhoanghiep1993]

Can I have a trace ID each request and when logging it auto add as a field in message? And from request -> function -> response , if I call write log it auto print the trace-ID

[aldas]

Are we talking about request logging or all log messages during request?

If you are using RequestLogger middleware https://github.com/labstack/echo/blob/master/middleware/request_logger.go you can add this into LogValuesFunc function.
If you are using Logger middleware you can use ${header:<NAME>} tag for log line. If you want more choices you need to wait for #2341 to be merged and then you can add custom callback for tag.

Also RequestID middleware has RequestIDHandler func(echo.Context, string) configuration field that can execute you custom logic and therefore add trace ID into logger etc.

[vuhoanghiep1993]

I resolve problem by custom zap logger with "With" function as parent logger and attach to echo.Context

`func NewContext(ctx echo.Context, fields ...zapcore.Field) echo.Context {
	ctx.Set(loggerKey, WithContext(ctx).With(fields...))
	return ctx
}
func WithContext(ctx echo.Context) *zap.Logger {
	if ctx == nil {
		return Logx
	}
	if ctxLogger, ok := ctx.Get(loggerKey).(*zap.Logger); ok {
		return ctxLogger
	}
	return Logx
}

func createContext(c echo.Context) echo.Context {
	return util.NewContext(c, zap.String("reqID", "xxxxx"))
}

`
when need add key, I use

`rqCtx := createContext(c)
Info(rqCtx)

func Info(ctx echo.Context, msg string, fields ...zapcore.Field) {
	ctx.Get(loggerKey).(*zap.Logger).Info(msg, fields...)
}

`