Esempio n. 1
0
func (r *rangeFetchTask) processRequest(req *http.Request) error {
	if !strings.EqualFold(req.Method, "GET") {
		return fmt.Errorf("Only GET request supported!")
	}
	r.req = req
	rangeHeader := req.Header.Get("Range")
	r.contentEnd = -1
	r.contentBegin = 0
	r.rangePos = 0
	r.expectedRangePos = 0
	if r.FetchLimit == 0 {
		r.FetchLimit = 256 * 1024
	}
	if r.FetchWorkerNum == 0 {
		r.FetchWorkerNum = 1
	}
	r.chunks = make(map[int]io.ReadCloser)
	if len(rangeHeader) > 0 {
		log.Printf("Session[%d]Start with range:%s ", r.SessionID, rangeHeader)
		r.originRangeHader = rangeHeader
		r.contentBegin, r.contentEnd = util.ParseRangeHeaderValue(rangeHeader)
		r.rangePos = r.contentBegin
		r.expectedRangePos = r.rangePos
	}
	return nil
}
Esempio n. 2
0
func (gae *GAEHttpConnection) handleHttpRes(conn *SessionConnection, req *event.HTTPRequestEvent, ev *event.HTTPResponseEvent) (*http.Response, error) {
	originRange := req.RawReq.Header.Get("Range")
	contentRange := ev.GetHeader("Content-Range")
	if ev.Status == 206 && len(contentRange) > 0 && strings.EqualFold(req.Method, "GET") {
		_, end, length := util.ParseContentRangeHeaderValue(contentRange)
		if len(originRange) > 0 {
			_, oe := util.ParseRangeHeaderValue(originRange)
			if oe > 0 {
				length = oe + 1
			}
		}
		if length > end+1 {
			gae.doRangeFetch(req.RawReq, ev.ToResponse())
			return nil, nil
		}
		if len(originRange) == 0 {
			ev.Status = 200
			ev.RemoveHeader("Content-Range")
		}
	}
	httpres := ev.ToResponse()
	err := httpres.Write(conn.LocalRawConn)
	return httpres, err
}
Esempio n. 3
0
func Fetch(context appengine.Context, ev *event.HTTPRequestEvent) event.Event {
	errorResponse := new(event.HTTPResponseEvent)
	if Cfg.IsMaster == 1 {
		fillErrorResponse(errorResponse, "Proxy service is no enable in snova master node.")
		return errorResponse
	}
	if isInBlacklist(ev.GetHeader("Host")) {
		fillErrorResponse(errorResponse, "Current site is in blacklist.")
		return errorResponse
	}
	req := buildHTTPRequest(ev)

	if req == nil {
		errorResponse.Status = 400
		fillErrorResponse(errorResponse, "Invalid fetch url:"+ev.Url)
		return errorResponse
	}
	var t urlfetch.Transport
	t.Context = context
	t.Deadline, _ = time.ParseDuration("10s")
	t.AllowInvalidServerCertificate = true
	//t := &transport
	//t := &urlfetch.Transport{context, 0, true}
	retryCount := Cfg.RetryFetchCount
	for retryCount > 0 {
		resp, err := t.RoundTrip(req)
		if err == nil {
			res := buildHTTPResponseEvent(resp)
			if res.Status == 302 {
				rangeHeader := req.Header.Get("Range")
				if len(rangeHeader) > 0 {
					res.AddHeader("X-Range", rangeHeader)
				}
			}
			return res
		}
		context.Errorf("Failed to fetch URL[%s] for reason:%v", ev.Url, err)
		retryCount--
		if strings.EqualFold(req.Method, "GET") && strings.Contains(err.Error(), "RESPONSE_TOO_LARGE") {
			rangeLimit := Cfg.RangeFetchLimit
			rangestart := 0
			rangeheader := req.Header.Get("Range")
			if len(rangeheader) > 0 {
				rangestart, _ = util.ParseRangeHeaderValue(rangeheader)
			}
			req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", rangestart, rangeLimit-1))
		}
		if strings.Contains(err.Error(), "RESPONSE_TOO_LARGE") {
			time.Sleep(1 * time.Second)
			return Fetch(context, ev)
		}

	}
	errorResponse.Status = 408
	fillErrorResponse(errorResponse, "Fetch timeout for url:"+ev.Url)
	rangeHeader := req.Header.Get("Range")
	if len(rangeHeader) > 0 {
		errorResponse.SetHeader("X-Range", rangeHeader)
	}
	return errorResponse

}