func timeGet(u string) (rec *record) {
rec = new(record)
transport := urlfetch.Transport{
Context: context,
Deadline: urlFetchTimeout,
}
req, err := http.NewRequest("POST", u, nil)
if err != nil {
rec.Err = err
return rec
}
start := time.Now()
resp, err := transport.RoundTrip(req)
end := time.Now()
if err != nil {
rec.Err = err
return rec
}
defer resp.Body.Close()
rec.Duration = end.Sub(start).Seconds()
rec.Status = resp.Status
return rec
}
func handler(w http.ResponseWriter, r *http.Request) {
context = appengine.NewContext(r)
fr, err := copyRequest(r)
if err != nil {
context.Errorf("copyRequest: %s", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
transport := urlfetch.Transport{
Context: context,
// Despite the name, Transport.Deadline is really a timeout and
// not an absolute deadline as used in the net package. In
// other words it is a time.Duration, not a time.Time.
Deadline: urlFetchTimeout,
}
resp, err := transport.RoundTrip(fr)
if err != nil {
context.Errorf("RoundTrip: %s", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer resp.Body.Close()
for _, key := range reflectedHeaderFields {
value := resp.Header.Get(key)
if value != "" {
w.Header().Add(key, value)
}
}
w.WriteHeader(resp.StatusCode)
n, err := io.Copy(w, resp.Body)
if err != nil {
context.Errorf("io.Copy after %d bytes: %s", n, err)
}
}
func fetch(c appengine.Context, key string) error {
s, ok := Sources[key]
if !ok {
return fmt.Errorf("%q not found", key)
}
c.Debugf("fetching %s data", key)
transport := urlfetch.Transport{Context: c, Deadline: 60 * time.Second}
req, err := http.NewRequest("GET", s.URL, strings.NewReader(""))
if err != nil {
return err
}
resp, err := transport.RoundTrip(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("fetch: bad status %d for %s", resp.StatusCode, s.URL)
}
contents, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
item := &memcache.Item{
Key: key,
Value: contents,
Expiration: s.Expiration,
}
if err := memcache.Set(c, item); err != nil {
return err
}
// We keep the last updated time in memcache. It's not
// updated atomically with the page, so it's only used to
// limit the rate of fetches from the data servers. Don't use
// it for display; use the data creation times in the data
// instead. It doesn't matter to the user that we fetched a
// weather forecast 3 minutes ago if the forecast is 48
// minutes old.
item = &memcache.Item{
Key: key + "_fresh",
Value: []byte(strconv.FormatInt(time.Now().Unix(), 10)),
}
if err := memcache.Set(c, item); err != nil {
return err
}
c.Infof("cached %d bytes of %s data", len(contents), key)
return nil
}
func fetch(context appengine.Context, ev *event.HTTPRequestEvent) event.Event {
errorResponse := new(event.NotifyEvent)
errorResponse.SetId(ev.GetId())
req, err := ev.ToRequest("")
if nil != err {
errorResponse.Code = event.ErrInvalidHttpRequest
errorResponse.Reason = fmt.Sprintf("Invalid fetch url:%s with err:%v", ev.URL, err)
return errorResponse
}
var t urlfetch.Transport
t.Context = context
t.Deadline, _ = time.ParseDuration("10s")
t.AllowInvalidServerCertificate = true
retryCount := 2
for retryCount > 0 {
resp, err := t.RoundTrip(req)
if err == nil {
res := event.NewHTTPResponseEvent(resp)
for nil != resp.Body {
buffer := make([]byte, 8192)
n, er := resp.Body.Read(buffer)
if nil != er {
context.Errorf("Failed to read body for reason:%v", er)
break
}
res.Content = append(res.Content, buffer[0:n]...)
}
if resp.ContentLength != int64(len(res.Content)) {
context.Errorf("Failed to read body %d %d", resp.ContentLength, len(res.Content))
}
context.Errorf("%v %d %d", resp.Header.Get("Content-Length"), resp.ContentLength, len(res.Content))
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") {
errorResponse.Code = event.ErrTooLargeResponse
return errorResponse
}
}
errorResponse.Code = event.ErrRemoteProxyTimeout
errorResponse.Reason = fmt.Sprintf("Fetch timeout for url:%s", ev.URL)
return errorResponse
}
func fetch(url string, c appengine.Context) ([]byte, error) {
transport := urlfetch.Transport{
Context: c,
Deadline: time.Duration(20) * time.Second,
AllowInvalidServerCertificate: false,
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
resp, err := transport.RoundTrip(req)
if err != nil {
return nil, err
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
resp.Body.Close()
return body, nil
}
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
}
