89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
package sockjs
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"strings"
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)
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var (
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cFrame = closeFrame(2010, "Another connection still open")
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xhrStreamingPrelude = strings.Repeat("h", 2048)
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)
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func (h *handler) xhrSend(rw http.ResponseWriter, req *http.Request) {
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if req.Body == nil {
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httpError(rw, "Payload expected.", http.StatusInternalServerError)
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return
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}
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var messages []string
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err := json.NewDecoder(req.Body).Decode(&messages)
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if err == io.EOF {
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httpError(rw, "Payload expected.", http.StatusInternalServerError)
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return
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}
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if _, ok := err.(*json.SyntaxError); ok || err == io.ErrUnexpectedEOF {
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httpError(rw, "Broken JSON encoding.", http.StatusInternalServerError)
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return
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}
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sessionID, err := h.parseSessionID(req.URL)
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if err != nil {
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http.Error(rw, err.Error(), http.StatusInternalServerError)
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return
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}
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h.sessionsMux.Lock()
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defer h.sessionsMux.Unlock()
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if sess, ok := h.sessions[sessionID]; !ok {
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http.NotFound(rw, req)
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} else {
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_ = sess.accept(messages...) // TODO(igm) reponse with SISE in case of err?
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rw.Header().Set("content-type", "text/plain; charset=UTF-8") // Ignored by net/http (but protocol test complains), see https://code.google.com/p/go/source/detail?r=902dc062bff8
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rw.WriteHeader(http.StatusNoContent)
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}
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}
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type xhrFrameWriter struct{}
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func (*xhrFrameWriter) write(w io.Writer, frame string) (int, error) {
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return fmt.Fprintf(w, "%s\n", frame)
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}
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func (h *handler) xhrPoll(rw http.ResponseWriter, req *http.Request) {
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rw.Header().Set("content-type", "application/javascript; charset=UTF-8")
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sess, _ := h.sessionByRequest(req) // TODO(igm) add err handling, although err should not happen as handler should not pass req in that case
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receiver := newHTTPReceiver(rw, 1, new(xhrFrameWriter))
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if err := sess.attachReceiver(receiver); err != nil {
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receiver.sendFrame(cFrame)
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receiver.close()
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return
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}
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select {
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case <-receiver.doneNotify():
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case <-receiver.interruptedNotify():
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}
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}
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func (h *handler) xhrStreaming(rw http.ResponseWriter, req *http.Request) {
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rw.Header().Set("content-type", "application/javascript; charset=UTF-8")
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fmt.Fprintf(rw, "%s\n", xhrStreamingPrelude)
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rw.(http.Flusher).Flush()
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sess, _ := h.sessionByRequest(req)
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receiver := newHTTPReceiver(rw, h.options.ResponseLimit, new(xhrFrameWriter))
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if err := sess.attachReceiver(receiver); err != nil {
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receiver.sendFrame(cFrame)
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receiver.close()
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return
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}
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select {
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case <-receiver.doneNotify():
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case <-receiver.interruptedNotify():
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}
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}
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