Method ServeHTTP

http.go:142–184

(w http.ResponseWriter, r *http.Request)

}

func (p *HTTPPool) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Parse request.
	if !strings.HasPrefix(r.URL.Path, p.opts.BasePath) {
		panic("HTTPPool serving unexpected path: " + r.URL.Path)
	}
	parts := strings.SplitN(r.URL.Path[len(p.opts.BasePath):], "/", 2)
	if len(parts) != 2 {
		http.Error(w, "bad request", http.StatusBadRequest)
		return
	}
	groupName := parts[0]
	key := parts[1]

	// Fetch the value for this group/key.
	group := GetGroup(groupName)
	if group == nil {
		http.Error(w, "no such group: "+groupName, http.StatusNotFound)
		return
	}
	var ctx context.Context
	if p.Context != nil {
		ctx = p.Context(r)
	} else {
		ctx = r.Context()
	}

	group.Stats.ServerRequests.Add(1)
	var value []byte
	err := group.Get(ctx, key, AllocatingByteSliceSink(&value))
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// Write the value to the response body as a proto message.
	body, err := proto.Marshal(&pb.GetResponse{Value: value})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/x-protobuf")
	w.Write(body)
}

type httpGetter struct {
	transport func(context.Context) http.RoundTripper