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")
})
}
func TestQuote(t *testing.T) {
soapServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, `<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<m:GetLastTradePriceResponse xmlns:m="Some-URI">
<Price>34.5</Price>
</m:GetLastTradePriceResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>`)
}))
defer soapServer.Close()
soapURL, _ := url.Parse(soapServer.URL)
wrapped := quote.Middleware(customctx.ContextHandlerFunc(quote.NewQuoteHandler(soapURL.Host)))
wrapped = timing.TimerMiddleware(wrapped)
h := &customctx.ContextAdapter{
Ctx: context.Background(),
Handler: wrapped,
}
ts := httptest.NewServer(h)
defer ts.Close()
req, err := http.NewRequest("GET", ts.URL+"/quote/MSFT", nil)
if err != nil {
log.Fatal(err.Error())
}
client := http.Client{}
resp, err := client.Do(req)
if err != nil {
log.Fatal(err.Error())
}
body, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
log.Fatal(err.Error())
}
println(string(body))
if !strings.Contains(string(body), "34.5") {
t.Fail()
}
}
//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)
})
}
func main() {
var endpoint = "mb:4545"
endPointFromEnv := os.Getenv("QUOTE_ENDPOINT")
if endPointFromEnv != "" {
endpoint = endPointFromEnv
fmt.Println("Using endpoint from environment:", endpoint)
}
fmt.Println("starting wrapped quote at ", endpoint)
wrapped := quote.Middleware(customctx.ContextHandlerFunc(quote.NewQuoteHandler(endpoint)))
wrapped = timing.TimerMiddleware(wrapped)
h := &customctx.ContextAdapter{
Ctx: context.Background(),
Handler: wrapped,
}
http.ListenAndServe(":8080", h)
}
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))
}
})
}
func TestWithXRequestID(t *testing.T) {
h := &customctx.ContextAdapter{
Ctx: context.Background(),
Handler: timing.TimerMiddleware(reqid.RequestIdMiddleware(customctx.ContextHandlerFunc(handler))),
}
ts := httptest.NewServer(h)
defer ts.Close()
req, err := http.NewRequest("GET", ts.URL, nil)
if err != nil {
log.Fatal(err.Error())
}
req.Header.Set("X-Request-ID", "request-id")
client := http.Client{}
var resp *http.Response
for i := 0; i < 1; i++ {
resp, err = client.Do(req)
if err != nil {
log.Fatal(err.Error())
}
}
body, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
log.Fatal(err.Error())
}
if !strings.Contains(string(body), "request-id") {
t.Fail()
}
}