// Write is one method with which request data is sent.
func (s *RequestStream) Write(inputData []byte) (int, error) {
if s.closed() || s.state.ClosedHere() {
return 0, errors.New("Error: Stream already closed.")
}
// Copy the data locally to avoid any pointer issues.
data := make([]byte, len(inputData))
copy(data, inputData)
// Send any new headers.
s.writeHeader()
// Chunk the response if necessary.
written := 0
for len(data) > common.MAX_DATA_SIZE {
dataFrame := new(frames.DATA)
dataFrame.StreamID = s.streamID
dataFrame.Data = data[:common.MAX_DATA_SIZE]
s.output <- dataFrame
written += common.MAX_DATA_SIZE
}
n := len(data)
if n == 0 {
return written, nil
}
dataFrame := new(frames.DATA)
dataFrame.StreamID = s.streamID
dataFrame.Data = data
s.output <- dataFrame
return written + n, nil
}
func (p *PushStream) Finish() {
p.writeHeader()
end := new(frames.DATA)
end.StreamID = p.streamID
end.Data = []byte{}
end.Flags = common.FLAG_FIN
p.output <- end
p.Close()
}
// Write is used for sending data in the push.
func (p *PushStream) Write(inputData []byte) (int, error) {
if p.closed() || p.state.ClosedHere() {
return 0, errors.New("Error: Stream already closed.")
}
state := p.origin.State()
if p.origin == nil || state.ClosedHere() {
return 0, errors.New("Error: Origin stream is closed.")
}
p.writeHeader()
// Copy the data locally to avoid any pointer issues.
data := make([]byte, len(inputData))
copy(data, inputData)
// Chunk the response if necessary.
written := 0
for len(data) > common.MAX_DATA_SIZE {
dataFrame := new(frames.DATA)
dataFrame.StreamID = p.streamID
dataFrame.Data = data[:common.MAX_DATA_SIZE]
p.output <- dataFrame
written += common.MAX_DATA_SIZE
}
n := len(data)
if n == 0 {
return written, nil
}
dataFrame := new(frames.DATA)
dataFrame.StreamID = p.streamID
dataFrame.Data = data
p.output <- dataFrame
return written + n, nil
}
// run is the main control path of
// the stream. It is prepared, the
// registered handler is called,
// and then the stream is cleaned
// up and closed.
func (s *ResponseStream) Run() error {
// Catch any panics.
defer func() {
if v := recover(); v != nil {
if s != nil && s.state != nil && !s.state.Closed() {
log.Printf("Encountered stream error: %v (%[1]T)\n", v)
}
}
}()
// Make sure Request is prepared.
if s.requestBody == nil || s.request.Body == nil {
s.requestBody = new(bytes.Buffer)
s.request.Body = &common.ReadCloser{s.requestBody}
}
// Wait until the full request has been received.
<-s.ready
/***************
*** HANDLER ***
***************/
s.handler.ServeHTTP(s, s.request)
// Close the stream with a SYN_REPLY if
// none has been sent, or an empty DATA
// frame, if a SYN_REPLY has been sent
// already.
// If the stream is already closed at
// this end, then nothing happens.
if !s.unidirectional {
if s.state.OpenHere() && !s.wroteHeader {
h := s.header
if h == nil {
h = make(http.Header)
}
h.Set("status", "200")
h.Set("version", "HTTP/1.1")
// Create the response SYN_REPLY.
synReply := new(frames.SYN_REPLY)
synReply.Flags = common.FLAG_FIN
synReply.StreamID = s.streamID
synReply.Header = h
s.output <- synReply
} else if s.state.OpenHere() {
// Create the DATA.
data := new(frames.DATA)
data.StreamID = s.streamID
data.Flags = common.FLAG_FIN
data.Data = []byte{}
s.output <- data
}
}
// Clean up state.
s.state.CloseHere()
if s.state.Closed() {
return s.Close()
}
return nil
}
// Request is used to make a client request.
func (c *Conn) Request(request *http.Request, receiver common.Receiver, priority common.Priority) (common.Stream, error) {
if c.Closed() {
return nil, common.ErrConnClosed
}
c.goawayLock.Lock()
goaway := c.goawayReceived || c.goawaySent
c.goawayLock.Unlock()
if goaway {
return nil, common.ErrGoaway
}
if c.server != nil {
return nil, errors.New("Error: Only clients can send requests.")
}
// Check stream limit would allow the new stream.
if !c.requestStreamLimit.Add() {
return nil, errors.New("Error: Max concurrent streams limit exceeded.")
}
if !priority.Valid(2) {
return nil, errors.New("Error: Priority must be in the range 0 - 7.")
}
url := request.URL
if url == nil || url.Scheme == "" || url.Host == "" {
return nil, errors.New("Error: Incomplete path provided to resource.")
}
// Prepare the SYN_STREAM.
path := url.Path
if url.RawQuery != "" {
path += "?" + url.RawQuery
}
if url.Fragment != "" {
path += "#" + url.Fragment
}
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
host := url.Host
if request.Host != "" {
host = request.Host
}
syn := new(frames.SYN_STREAM)
syn.Priority = priority
syn.Header = request.Header
syn.Header.Set("method", request.Method)
syn.Header.Set("url", path)
syn.Header.Set("version", "HTTP/1.1")
syn.Header.Set("host", host)
syn.Header.Set("scheme", url.Scheme)
// Prepare the request body, if any.
body := make([]*frames.DATA, 0, 1)
if request.Body != nil {
buf := make([]byte, 32*1024)
n, err := request.Body.Read(buf)
if err != nil && err != io.EOF {
return nil, err
}
total := n
for n > 0 {
data := new(frames.DATA)
data.Data = make([]byte, n)
copy(data.Data, buf[:n])
body = append(body, data)
n, err = request.Body.Read(buf)
if err != nil && err != io.EOF {
return nil, err
}
total += n
}
// Half-close the stream.
if len(body) == 0 {
syn.Flags = common.FLAG_FIN
} else {
syn.Header.Set("Content-Length", fmt.Sprint(total))
body[len(body)-1].Flags = common.FLAG_FIN
}
request.Body.Close()
} else {
syn.Flags = common.FLAG_FIN
}
// Send.
c.streamCreation.Lock()
defer c.streamCreation.Unlock()
c.lastRequestStreamIDLock.Lock()
if c.lastRequestStreamID == 0 {
c.lastRequestStreamID = 1
} else {
c.lastRequestStreamID += 2
}
syn.StreamID = c.lastRequestStreamID
c.lastRequestStreamIDLock.Unlock()
if syn.StreamID > common.MAX_STREAM_ID {
return nil, errors.New("Error: All client streams exhausted.")
}
c.output[0] <- syn
for _, frame := range body {
frame.StreamID = syn.StreamID
c.output[0] <- frame
}
// // Create the request stream.
out := NewRequestStream(c, syn.StreamID, c.output[0])
out.Request = request
out.Receiver = receiver
// Store in the connection map.
c.streamsLock.Lock()
c.streams[syn.StreamID] = out
c.streamsLock.Unlock()
return out, nil
}