forked from igm/sockjs-go
/
httpreceiver.go
104 lines (93 loc) · 2.4 KB
/
httpreceiver.go
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package sockjs
import (
"fmt"
"io"
"net/http"
"strings"
"sync"
)
type frameWriter interface {
write(writer io.Writer, frame string) (int, error)
}
type httpReceiverState int
const (
stateHTTPReceiverActive httpReceiverState = iota
stateHTTPReceiverClosed
)
type httpReceiver struct {
sync.Mutex
state httpReceiverState
frameWriter frameWriter
rw http.ResponseWriter
maxResponseSize uint32
currentResponseSize uint32
doneCh chan struct{}
interruptCh chan struct{}
}
func newHTTPReceiver(rw http.ResponseWriter, maxResponse uint32, frameWriter frameWriter) *httpReceiver {
recv := &httpReceiver{
rw: rw,
frameWriter: frameWriter,
maxResponseSize: maxResponse,
doneCh: make(chan struct{}),
interruptCh: make(chan struct{}),
}
if closeNotifier, ok := rw.(http.CloseNotifier); ok {
// if supported check for close notifications from http.RW
go func() {
select {
case <-closeNotifier.CloseNotify():
recv.Lock()
defer recv.Unlock()
if recv.state < stateHTTPReceiverClosed {
recv.state = stateHTTPReceiverClosed
close(recv.interruptCh)
}
case <-recv.doneCh:
// ok, no action needed here, receiver closed in correct way
// just finish the routine
}
}()
}
return recv
}
func (recv *httpReceiver) sendBulk(messages ...string) {
if len(messages) > 0 {
recv.sendFrame(fmt.Sprintf("a[%s]",
strings.Join(
transform(messages, quote),
",",
),
))
}
}
func (recv *httpReceiver) sendFrame(value string) {
recv.Lock()
defer recv.Unlock()
if recv.state == stateHTTPReceiverActive {
// TODO(igm) check err, possibly act as if interrupted
n, _ := recv.frameWriter.write(recv.rw, value)
recv.currentResponseSize += uint32(n)
if recv.currentResponseSize >= recv.maxResponseSize {
recv.state = stateHTTPReceiverClosed
close(recv.doneCh)
} else {
recv.rw.(http.Flusher).Flush()
}
}
}
func (recv *httpReceiver) doneNotify() <-chan struct{} { return recv.doneCh }
func (recv *httpReceiver) interruptedNotify() <-chan struct{} { return recv.interruptCh }
func (recv *httpReceiver) close() {
recv.Lock()
defer recv.Unlock()
if recv.state < stateHTTPReceiverClosed {
recv.state = stateHTTPReceiverClosed
close(recv.doneCh)
}
}
func (recv *httpReceiver) canSend() bool {
recv.Lock()
defer recv.Unlock()
return recv.state != stateHTTPReceiverClosed
}