ikawaha/tracer

HTTP request/response tracer middleware

The Trace middleware that keeps request copy and response records in context. For example, this middleware can be used to record API requests and responses in the database. It is also useful when there is no HTTP request in the controller and only context can be obtained due to limitations of frameworks such as Goa.

If you do not need to record responses, you can use RecordRequest middleware.

Middleware	Targets	Context Key	Context Object	Option
Trace	Request and Response	TrackerKey	Tracker	DiscardResponseBody
RecordRequest	Request	RequestRecorderKey	RequestRecorder

Example

The Trace middleware used with Goa. Following is an example of a controller:

func (s *calcsrvc) Add(ctx context.Context, p *calc.AddPayload) (res int, err error) {
	var header http.Header
	tracker, ok := ctx.Value(tracer.TrackerKey).(*tracer.Tracker)
	if ok {
		header = tracker.Request.Header
	}
	s.logger.Printf("calc.add, Header: %+v", header)
	return p.A + p.B, nil
}

Blog: http://ikawaha.hateblo.jp/entry/2019/12/05/235917

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License MIT