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stream.go
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stream.go
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package main
import (
"context"
"fmt"
"net/http"
"sync"
"time"
"github.com/pyke369/golang-support/bslab"
"github.com/pyke369/golang-support/uws"
_ "encoding/hex"
)
const (
FLAG_HEAD = 0x01
FLAG_BODY = 0x02
FLAG_RAW = 0x04
FLAG_ABRT = 0x08
FLAG_UPGD = 0x20
FLAG_START = 0x40
FLAG_END = 0x80
)
type FRAME struct {
Flags int
Data []byte
}
type STREAM struct {
domain *DOMAIN
id int
sync.RWMutex
shut bool
queue chan *FRAME
}
func (s *STREAM) Queue(flags int, data []byte) (err error) {
s.RLock()
if !s.shut {
s.queue <- &FRAME{flags, data}
} else {
err = fmt.Errorf("shut")
}
s.RUnlock()
return
}
func (s *STREAM) Read(timeout time.Duration, ctx context.Context) (frame *FRAME) {
s.RLock()
if s.shut {
s.RUnlock()
return nil
}
s.RUnlock()
if ctx == nil {
ctx = context.Background()
}
select {
case frame = <-s.queue:
case <-time.After(timeout):
case <-ctx.Done():
}
return
}
func (s *STREAM) Write(flags int, data []byte) (err error) {
// fmt.Printf("stream-write (%d)\n%s", len(data), hex.Dump(data))
s.RLock()
if s.shut {
s.RUnlock()
err = fmt.Errorf("shut")
} else {
s.RUnlock()
s.domain.RLock()
if s.domain.connected {
s.domain.RUnlock()
err = s.domain.agent.Write(uws.WEBSOCKET_OPCODE_BLOB, append(data, []byte{byte(flags), byte(s.id >> 16), byte(s.id >> 8), byte(s.id)}...))
} else {
s.domain.RUnlock()
err = fmt.Errorf("disconnected")
}
}
return
}
func (s *STREAM) Status(code int) {
headers := fmt.Sprintf(
"HTTP/1.1 %d %s\r\nDate: %s\r\n\r\n",
code, http.StatusText(code),
time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05 GMT"),
)
s.Write(FLAG_HEAD|FLAG_START|FLAG_END, []byte(headers))
}
func (s *STREAM) Shutdown(abort bool, remove bool) {
s.RLock()
if !s.shut {
s.RUnlock()
if abort {
s.Write(FLAG_ABRT, nil)
}
s.Lock()
s.shut = true
s.Unlock()
flushed:
for {
select {
case frame := <-s.queue:
if frame != nil {
bslab.Put(frame.Data)
}
default:
break flushed
}
}
s.Lock()
close(s.queue)
s.Unlock()
if remove {
s.domain.Lock()
delete(s.domain.streams, s.id)
s.domain.Unlock()
}
Logger.Debug(map[string]interface{}{"mode": Mode, "event": "stream", "domain": s.domain.Name, "stream": s.id, "action": "shutdown"})
} else {
s.RUnlock()
}
}