func (r *RoundRobin) NextServer() (*url.URL, error) {
srv, err := r.nextServer()
if err != nil {
return nil, err
}
return utils.CopyURL(srv.url), nil
}
func (f *Forwarder) copyRequest(req *http.Request, u *url.URL) *http.Request {
outReq := new(http.Request)
*outReq = *req // includes shallow copies of maps, but we handle this below
outReq.URL = utils.CopyURL(req.URL)
outReq.URL.Scheme = u.Scheme
outReq.URL.Host = u.Host
outReq.URL.Opaque = req.RequestURI
// raw query is already included in RequestURI, so ignore it to avoid dupes
outReq.URL.RawQuery = ""
// Do not pass client Host header unless optsetter PassHostHeader is set.
if f.passHost != true {
outReq.Host = u.Host
}
outReq.Proto = "HTTP/1.1"
outReq.ProtoMajor = 1
outReq.ProtoMinor = 1
// Overwrite close flag so we can keep persistent connection for the backend servers
outReq.Close = false
outReq.Header = make(http.Header)
utils.CopyHeaders(outReq.Header, req.Header)
if f.rewriter != nil {
f.rewriter.Rewrite(outReq)
}
return outReq
}
// In case if server is already present in the load balancer, returns error
func (rr *RoundRobin) UpsertServer(u *url.URL, options ...ServerOption) error {
rr.mutex.Lock()
defer rr.mutex.Unlock()
if u == nil {
return fmt.Errorf("server URL can't be nil")
}
if s, _ := rr.findServerByURL(u); s != nil {
for _, o := range options {
if err := o(s); err != nil {
return err
}
}
rr.resetState()
return nil
}
srv := &server{url: utils.CopyURL(u)}
for _, o := range options {
if err := o(srv); err != nil {
return err
}
}
if srv.weight == 0 {
srv.weight = defaultWeight
}
rr.servers = append(rr.servers, srv)
rr.resetState()
return nil
}
// copyRequest makes a copy of the specified request.
func (f *websocketForwarder) copyRequest(req *http.Request) (outReq *http.Request) {
outReq = new(http.Request)
*outReq = *req
outReq.URL = utils.CopyURL(req.URL)
outReq.URL.Scheme = req.URL.Scheme
outReq.URL.Host = req.URL.Host
return outReq
}
func (s *Buffer) copyRequest(req *http.Request, body io.ReadCloser, bodySize int64) *http.Request {
o := *req
o.URL = utils.CopyURL(req.URL)
o.Header = make(http.Header)
utils.CopyHeaders(o.Header, req.Header)
o.ContentLength = bodySize
// remove TransferEncoding that could have been previously set because we have transformed the request from chunked encoding
o.TransferEncoding = []string{}
// http.Transport will close the request body on any error, we are controlling the close process ourselves, so we override the closer here
o.Body = ioutil.NopCloser(body)
return &o
}
func (rb *Rebalancer) upsertServer(u *url.URL, weight int) error {
if s, i := rb.findServer(u); i != -1 {
s.origWeight = weight
}
meter, err := rb.newMeter()
if err != nil {
return err
}
rbSrv := &rbServer{
url: utils.CopyURL(u),
origWeight: weight,
curWeight: weight,
meter: meter,
}
rb.servers = append(rb.servers, rbSrv)
return nil
}
// serveHTTP forwards HTTP traffic using the configured transport
func (f *httpStreamingForwarder) serveHTTP(w http.ResponseWriter, req *http.Request, ctx *handlerContext) {
pw := utils.ProxyWriter{
W: w,
}
start := time.Now().UTC()
reqUrl, err := url.ParseRequestURI(req.RequestURI)
if err != nil {
log.Errorf("Error parsing Request URI %v, err: %v", req.RequestURI, err)
ctx.errHandler.ServeHTTP(w, req, err)
return
}
urlcpy := utils.CopyURL(req.URL)
urlcpy.Scheme = req.URL.Scheme
urlcpy.Host = req.URL.Host
req.URL.Path = reqUrl.Path
req.URL.RawQuery = reqUrl.RawQuery
revproxy := httputil.NewSingleHostReverseProxy(urlcpy)
revproxy.FlushInterval = f.flushInterval //Flush something every 100 milliseconds
revproxy.ServeHTTP(w, req)
if req.TLS != nil {
log.Infof("Round trip: %v, code: %v, Length: %v, duration: %v tls:version: %x, tls:resume:%t, tls:csuite:%x, tls:server:%v",
req.URL, pw.Code, pw.Length, time.Now().UTC().Sub(start),
req.TLS.Version,
req.TLS.DidResume,
req.TLS.CipherSuite,
req.TLS.ServerName)
} else {
log.Infof("Round trip: %v, code: %v, Length: %v, duration: %v",
req.URL, pw.Code, pw.Length, time.Now().UTC().Sub(start))
}
}