forked from googollee/go-engine.io
/
polling-xhr.go
129 lines (112 loc) · 2.36 KB
/
polling-xhr.go
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package engineio
import (
"io"
"net/http"
)
func init() {
registerTransport("polling", false, newPollingTransport)
}
type polling struct {
sendChan chan bool
encoder *payloadEncoder
conn Conn
}
func newPollingTransport(w http.ResponseWriter, r *http.Request) (transport, error) {
newEncoder := newBinaryPayloadEncoder
if r.URL.Query()["b64"] != nil {
newEncoder = newStringPayloadEncoder
}
ret := &polling{
sendChan: make(chan bool, 1),
encoder: newEncoder(),
}
return ret, nil
}
func (*polling) Name() string {
return "polling"
}
func (p *polling) SetConn(s Conn) {
p.conn = s
}
func (*polling) SupportsFraming() bool {
return false
}
func (p *polling) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
p.get(w, r)
case "POST":
p.post(w, r)
}
}
func (p *polling) Close() error {
close(p.sendChan)
p.sendChan = nil
p.conn = nil
return nil
}
func (p *polling) NextWriter(msgType MessageType, packetType packetType) (io.WriteCloser, error) {
var ret io.WriteCloser
var err error
switch msgType {
case MessageText:
ret, err = p.encoder.NextString(packetType)
case MessageBinary:
ret, err = p.encoder.NextBinary(packetType)
}
if err != nil {
return nil, err
}
return newPollingWriter(ret, p), nil
}
type pollingWriter struct {
io.WriteCloser
sendChan chan bool
}
func newPollingWriter(w io.WriteCloser, p *polling) *pollingWriter {
return &pollingWriter{
WriteCloser: w,
sendChan: p.sendChan,
}
}
func (w *pollingWriter) Close() error {
select {
case w.sendChan <- true:
default:
}
return w.WriteCloser.Close()
}
func (p *polling) get(w http.ResponseWriter, r *http.Request) {
send := <-p.sendChan
if !send {
http.Error(w, "closed", http.StatusBadRequest)
return
}
if p.encoder.IsString() {
w.Header().Set("Content-Type", "text/plain; charset=UTF-8")
} else {
w.Header().Set("Content-Type", "application/octet-stream")
}
p.encoder.EncodeTo(w)
}
func (p *polling) post(w http.ResponseWriter, r *http.Request) {
if p.conn == nil {
http.Error(w, "closed", http.StatusBadRequest)
return
}
decoder := newPayloadDecoder(r.Body)
for {
d, err := decoder.Next()
if err == io.EOF {
break
}
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
p.conn.onPacket(d)
d.Close()
}
w.Header().Set("Content-Type", "text/html")
w.Write([]byte("ok"))
}