Example #1
0
func RequestIdMiddleware(h cc.ContextHandler) cc.ContextHandler {
	return cc.ContextHandlerFunc(func(ctx context.Context, rw http.ResponseWriter, req *http.Request) {
		ctx = NewContextWithRequestID(ctx, req)
		println("-->Request id serve http")
		h.ServeHTTPContext(ctx, rw, req)
		println("<--Request id http served")
	})
}
Example #2
0
//Middleware returns a context aware wrapper that converts a GET on a stock symbol
//to a SOAP request to the quote service
func Middleware(ctxHandler cc.ContextHandler) cc.ContextHandler {
	return cc.ContextHandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {

		const timerName = "message and protocol transformation"
		timing.StartTimer(ctx, timerName)

		//Grab the symbol to quote from the uri
		resourceID, err := extractResource(r.RequestURI)
		if err != nil {
			w.WriteHeader(http.StatusNotFound)
			w.Write([]byte(err.Error()))
			return
		}

		println("quote for", resourceID)

		//Convert the method to POST for SOAP, and set the soap service
		//endpoint for the destination server
		r.Method = "POST"
		r.URL.Path = "/services/quote/getquote"

		//Form the SOAP payload
		payload := getQuoteRequestForSymbol(resourceID)
		payloadBytes, err := xml.Marshal(&payload)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		//Post the payload, and record the response
		r.Body = ioutil.NopCloser(bytes.NewReader(payloadBytes))
		rec := httptest.NewRecorder()

		ctxHandler.ServeHTTPContext(ctx, rec, r)

		//Parse the recorded response to allow the quote price to be extracted
		var response responseEnvelope
		err = xml.Unmarshal(rec.Body.Bytes(), &response)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			timing.EndTimer(ctx, timerName, err)
			return
		}

		//Return just the price to the caller
		w.Write([]byte(response.Body.GetLastTradePriceResponse.Price + "\n"))
		timing.EndTimer(ctx, timerName, nil)

	})
}
Example #3
0
func TimerMiddleware(h cc.ContextHandler) cc.ContextHandler {
	return cc.ContextHandlerFunc(func(ctx context.Context, rw http.ResponseWriter, req *http.Request) {
		ctx = newContextWithTimings(ctx, req)
		start := time.Now()

		println("-->Timer mgmt serve http")
		h.ServeHTTPContext(ctx, rw, req)
		println("<--Timer mgmt http served")

		stop := time.Now()
		timings := ctx.Value(timeKey).(*timings)

		timingStr, err := timings.dumpTimings(stop.Sub(start))
		if err != nil {
			log.Println("Unable to dump timings", err.Error())
		} else {
			log.Println(string(timingStr))
		}

	})
}