Ejemplo n.º 1
0
// Standard net/http function. Shouldn't be used directly, http.Serve will use it.
func (proxy *ProxyHttpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	//r.Header["X-Forwarded-For"] = w.RemoteAddr()
	if r.Method == "CONNECT" {
		proxy.handleHttps(w, r)
	} else {
		ctx := &ProxyCtx{Req: r, Session: atomic.AddInt64(&proxy.sess, 1), proxy: proxy}

		var err error
		ctx.Logf("Got request %v %v %v %v", r.URL.Path, r.Host, r.Method, r.URL.String())
		if !r.URL.IsAbs() {
			proxy.NonproxyHandler.ServeHTTP(w, r)
			return
		}
		r, resp := proxy.filterRequest(r, ctx)

		if resp == nil {
			removeProxyHeaders(ctx, r)
			resp, err = ctx.RoundTrip(r)
			if err != nil {
				ctx.Error = err
				resp = proxy.filterResponse(nil, ctx)
				if resp == nil {
					ctx.Logf("error read response %v %v:", r.URL.Host, err.Error())
					http.Error(w, err.Error(), 500)
					return
				}
			}
			ctx.Logf("Received response %v", resp.Status)
		}
		origBody := resp.Body
		resp = proxy.filterResponse(resp, ctx)

		ctx.Logf("Copying response to client %v [%d]", resp.Status, resp.StatusCode)
		// http.ResponseWriter will take care of filling the correct response length
		// Setting it now, might impose wrong value, contradicting the actual new
		// body the user returned.
		// We keep the original body to remove the header only if things changed.
		// This will prevent problems with HEAD requests where there's no body, yet,
		// the Content-Length header should be set.
		if origBody != resp.Body {
			resp.Header.Del("Content-Length")
		}

		// Throttle response reader
		var reader io.Reader
		if proxy.TokenBucket != nil {
			reader = ratelimit.Reader(resp.Body, proxy.TokenBucket)
		} else {
			reader = resp.Body
		}
		copyHeaders(w.Header(), resp.Header)
		w.WriteHeader(resp.StatusCode)
		nr, err := io.Copy(w, reader)
		if err := resp.Body.Close(); err != nil {
			ctx.Warnf("Can't close response body %v", err)
		}
		ctx.Logf("Copied %v bytes to client error=%v", nr, err)
	}
}
Ejemplo n.º 2
0
func NewRateLimitReader(rc io.ReadCloser, rate float64, capacity int64) io.ReadCloser {
	var rlr rateLimitReader

	rlr.rc = rc
	rlr.rlr = ratelimit.Reader(rc, ratelimit.NewBucketWithRate(rate, capacity))

	return &rlr
}