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http/spdy: reorganize package.

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R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4524087
This commit is contained in:
William Chan 2011-06-01 17:30:49 -07:00 committed by Brad Fitzpatrick
parent 17bfa32fde
commit bc3a72fa28
6 changed files with 641 additions and 630 deletions
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5
src/pkg/http/spdy/Makefile
View File

@ -6,7 +6,8 @@ include ../../../Make.inc
TARG=http/spdy
GOFILES=\
framer.go\
protocol.go\
read.go\
types.go\
write.go\
include ../../../Make.pkg

443
src/pkg/http/spdy/framer.go
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@ -1,443 +0,0 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package spdy
import (
"bytes"
"encoding/binary"
"compress/zlib"
"http"
"io"
"os"
"strconv"
"strings"
)
type FramerError int
const (
Internal FramerError = iota
InvalidControlFrame
UnlowercasedHeaderName
DuplicateHeaders
UnknownFrameType
InvalidDataFrame
)
func (e FramerError) String() string {
switch e {
case Internal:
return "Internal"
case InvalidControlFrame:
return "InvalidControlFrame"
case UnlowercasedHeaderName:
return "UnlowercasedHeaderName"
case DuplicateHeaders:
return "DuplicateHeaders"
case UnknownFrameType:
return "UnknownFrameType"
case InvalidDataFrame:
return "InvalidDataFrame"
}
return "Error(" + strconv.Itoa(int(e)) + ")"
}
type corkedReader struct {
r io.Reader
ch chan int
n int
}
func (cr *corkedReader) Read(p []byte) (int, os.Error) {
if cr.n == 0 {
cr.n = <-cr.ch
}
if len(p) > cr.n {
p = p[:cr.n]
}
n, err := cr.r.Read(p)
cr.n -= n
return n, err
}
// Framer handles serializing/deserializing SPDY frames, including compressing/
// decompressing payloads.
type Framer struct {
headerCompressionDisabled bool
w io.Writer
headerBuf *bytes.Buffer
headerCompressor *zlib.Writer
r io.Reader
headerReader corkedReader
headerDecompressor io.ReadCloser
}
// NewFramer allocates a new Framer for a given SPDY connection, repesented by
// a io.Writer and io.Reader. Note that Framer will read and write individual fields
// from/to the Reader and Writer, so the caller should pass in an appropriately
// buffered implementation to optimize performance.
func NewFramer(w io.Writer, r io.Reader) (*Framer, os.Error) {
compressBuf := new(bytes.Buffer)
compressor, err := zlib.NewWriterDict(compressBuf, zlib.BestCompression, []byte(HeaderDictionary))
if err != nil {
return nil, err
}
framer := &Framer{
w: w,
headerBuf: compressBuf,
headerCompressor: compressor,
r: r,
}
return framer, nil
}
func (f *Framer) uncorkHeaderDecompressor(payloadSize int) os.Error {
if f.headerDecompressor != nil {
f.headerReader.ch <- payloadSize
return nil
}
f.headerReader = corkedReader{r: f.r, ch: make(chan int, 1), n: payloadSize}
decompressor, err := zlib.NewReaderDict(&f.headerReader, []byte(HeaderDictionary))
if err != nil {
return err
}
f.headerDecompressor = decompressor
return nil
}
// ReadFrame reads SPDY encoded data and returns a decompressed Frame.
func (f *Framer) ReadFrame() (Frame, os.Error) {
var firstWord uint32
if err := binary.Read(f.r, binary.BigEndian, &firstWord); err != nil {
return nil, err
}
if (firstWord & 0x80000000) != 0 {
frameType := ControlFrameType(firstWord & 0xffff)
version := uint16(0x7fff & (firstWord >> 16))
return f.parseControlFrame(version, frameType)
}
return f.parseDataFrame(firstWord & 0x7fffffff)
}
func (f *Framer) parseControlFrame(version uint16, frameType ControlFrameType) (Frame, os.Error) {
var length uint32
if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
return nil, err
}
flags := ControlFlags((length & 0xff000000) >> 24)
length &= 0xffffff
header := ControlFrameHeader{version, frameType, flags, length}
cframe, err := newControlFrame(frameType)
if err != nil {
return nil, err
}
if err = cframe.read(header, f); err != nil {
return nil, err
}
return cframe, nil
}
func parseHeaderValueBlock(r io.Reader) (http.Header, os.Error) {
var numHeaders uint16
if err := binary.Read(r, binary.BigEndian, &numHeaders); err != nil {
return nil, err
}
h := make(http.Header, int(numHeaders))
for i := 0; i < int(numHeaders); i++ {
var length uint16
if err := binary.Read(r, binary.BigEndian, &length); err != nil {
return nil, err
}
nameBytes := make([]byte, length)
if _, err := io.ReadFull(r, nameBytes); err != nil {
return nil, err
}
name := string(nameBytes)
if name != strings.ToLower(name) {
return nil, UnlowercasedHeaderName
}
if h[name] != nil {
return nil, DuplicateHeaders
}
if err := binary.Read(r, binary.BigEndian, &length); err != nil {
return nil, err
}
value := make([]byte, length)
if _, err := io.ReadFull(r, value); err != nil {
return nil, err
}
valueList := strings.Split(string(value), "\x00", -1)
for _, v := range valueList {
h.Add(name, v)
}
}
return h, nil
}
func (f *Framer) readSynStreamFrame(h ControlFrameHeader, frame *SynStreamFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
if err = binary.Read(f.r, binary.BigEndian, &frame.AssociatedToStreamId); err != nil {
return err
}
if err = binary.Read(f.r, binary.BigEndian, &frame.Priority); err != nil {
return err
}
frame.Priority >>= 14
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 10))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) readSynReplyFrame(h ControlFrameHeader, frame *SynReplyFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
var unused uint16
if err = binary.Read(f.r, binary.BigEndian, &unused); err != nil {
return err
}
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 6))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) readHeadersFrame(h ControlFrameHeader, frame *HeadersFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
var unused uint16
if err = binary.Read(f.r, binary.BigEndian, &unused); err != nil {
return err
}
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 6))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) parseDataFrame(streamId uint32) (*DataFrame, os.Error) {
var length uint32
if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
return nil, err
}
var frame DataFrame
frame.StreamId = streamId
frame.Flags = DataFlags(length >> 24)
length &= 0xffffff
frame.Data = make([]byte, length)
// TODO(willchan): Support compressed data frames.
if _, err := io.ReadFull(f.r, frame.Data); err != nil {
return nil, err
}
return &frame, nil
}
// WriteFrame writes a frame.
func (f *Framer) WriteFrame(frame Frame) os.Error {
return frame.write(f)
}
func writeControlFrameHeader(w io.Writer, h ControlFrameHeader) os.Error {
if err := binary.Write(w, binary.BigEndian, 0x8000|h.version); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, h.frameType); err != nil {
return err
}
flagsAndLength := (uint32(h.Flags) << 24) | h.length
if err := binary.Write(w, binary.BigEndian, flagsAndLength); err != nil {
return err
}
return nil
}
func writeHeaderValueBlock(w io.Writer, h http.Header) (n int, err os.Error) {
n = 0
if err = binary.Write(w, binary.BigEndian, uint16(len(h))); err != nil {
return
}
n += 2
for name, values := range h {
if err = binary.Write(w, binary.BigEndian, uint16(len(name))); err != nil {
return
}
n += 2
name = strings.ToLower(name)
if _, err = io.WriteString(w, name); err != nil {
return
}
n += len(name)
v := strings.Join(values, "\x00")
if err = binary.Write(w, binary.BigEndian, uint16(len(v))); err != nil {
return
}
n += 2
if _, err = io.WriteString(w, v); err != nil {
return
}
n += len(v)
}
return
}
func (f *Framer) writeSynStreamFrame(frame *SynStreamFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSynStream
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 10)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.AssociatedToStreamId); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.Priority<<14); err != nil {
return err
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return err
}
f.headerBuf.Reset()
return nil
}
func (f *Framer) writeSynReplyFrame(frame *SynReplyFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSynReply
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 6)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint16(0)); err != nil {
return
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return
}
f.headerBuf.Reset()
return
}
func (f *Framer) writeHeadersFrame(frame *HeadersFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeHeaders
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 6)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint16(0)); err != nil {
return
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return
}
f.headerBuf.Reset()
return
}
func (f *Framer) writeDataFrame(frame *DataFrame) (err os.Error) {
// Validate DataFrame
if frame.StreamId&0x80000000 != 0 || len(frame.Data) >= 0x0f000000 {
return InvalidDataFrame
}
// TODO(willchan): Support data compression.
// Serialize frame to Writer
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
flagsAndLength := (uint32(frame.Flags) << 24) | uint32(len(frame.Data))
if err = binary.Write(f.w, binary.BigEndian, flagsAndLength); err != nil {
return
}
if _, err = f.w.Write(frame.Data); err != nil {
return
}
return nil
}

287
src/pkg/http/spdy/read.go Normal file
View File

@ -0,0 +1,287 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package spdy
import (
"compress/zlib"
"encoding/binary"
"http"
"io"
"os"
"strings"
)
func (frame *SynStreamFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readSynStreamFrame(h, frame)
}
func (frame *SynReplyFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readSynReplyFrame(h, frame)
}
func (frame *RstStreamFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
if err := binary.Read(f.r, binary.BigEndian, &frame.Status); err != nil {
return err
}
return nil
}
func (frame *SettingsFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
var numSettings uint32
if err := binary.Read(f.r, binary.BigEndian, &numSettings); err != nil {
return err
}
frame.FlagIdValues = make([]SettingsFlagIdValue, numSettings)
for i := uint32(0); i < numSettings; i++ {
if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Id); err != nil {
return err
}
frame.FlagIdValues[i].Flag = SettingsFlag((frame.FlagIdValues[i].Id & 0xff000000) >> 24)
frame.FlagIdValues[i].Id &= 0xffffff
if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Value); err != nil {
return err
}
}
return nil
}
func (frame *NoopFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
return nil
}
func (frame *PingFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.Id); err != nil {
return err
}
return nil
}
func (frame *GoAwayFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.LastGoodStreamId); err != nil {
return err
}
return nil
}
func (frame *HeadersFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readHeadersFrame(h, frame)
}
func newControlFrame(frameType ControlFrameType) (controlFrame, os.Error) {
ctor, ok := cframeCtor[frameType]
if !ok {
return nil, InvalidControlFrame
}
return ctor(), nil
}
var cframeCtor = map[ControlFrameType]func() controlFrame{
TypeSynStream: func() controlFrame { return new(SynStreamFrame) },
TypeSynReply: func() controlFrame { return new(SynReplyFrame) },
TypeRstStream: func() controlFrame { return new(RstStreamFrame) },
TypeSettings: func() controlFrame { return new(SettingsFrame) },
TypeNoop: func() controlFrame { return new(NoopFrame) },
TypePing: func() controlFrame { return new(PingFrame) },
TypeGoAway: func() controlFrame { return new(GoAwayFrame) },
TypeHeaders: func() controlFrame { return new(HeadersFrame) },
// TODO(willchan): Add TypeWindowUpdate
}
type corkedReader struct {
r io.Reader
ch chan int
n int
}
func (cr *corkedReader) Read(p []byte) (int, os.Error) {
if cr.n == 0 {
cr.n = <-cr.ch
}
if len(p) > cr.n {
p = p[:cr.n]
}
n, err := cr.r.Read(p)
cr.n -= n
return n, err
}
func (f *Framer) uncorkHeaderDecompressor(payloadSize int) os.Error {
if f.headerDecompressor != nil {
f.headerReader.ch <- payloadSize
return nil
}
f.headerReader = corkedReader{r: f.r, ch: make(chan int, 1), n: payloadSize}
decompressor, err := zlib.NewReaderDict(&f.headerReader, []byte(HeaderDictionary))
if err != nil {
return err
}
f.headerDecompressor = decompressor
return nil
}
// ReadFrame reads SPDY encoded data and returns a decompressed Frame.
func (f *Framer) ReadFrame() (Frame, os.Error) {
var firstWord uint32
if err := binary.Read(f.r, binary.BigEndian, &firstWord); err != nil {
return nil, err
}
if (firstWord & 0x80000000) != 0 {
frameType := ControlFrameType(firstWord & 0xffff)
version := uint16(0x7fff & (firstWord >> 16))
return f.parseControlFrame(version, frameType)
}
return f.parseDataFrame(firstWord & 0x7fffffff)
}
func (f *Framer) parseControlFrame(version uint16, frameType ControlFrameType) (Frame, os.Error) {
var length uint32
if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
return nil, err
}
flags := ControlFlags((length & 0xff000000) >> 24)
length &= 0xffffff
header := ControlFrameHeader{version, frameType, flags, length}
cframe, err := newControlFrame(frameType)
if err != nil {
return nil, err
}
if err = cframe.read(header, f); err != nil {
return nil, err
}
return cframe, nil
}
func parseHeaderValueBlock(r io.Reader) (http.Header, os.Error) {
var numHeaders uint16
if err := binary.Read(r, binary.BigEndian, &numHeaders); err != nil {
return nil, err
}
h := make(http.Header, int(numHeaders))
for i := 0; i < int(numHeaders); i++ {
var length uint16
if err := binary.Read(r, binary.BigEndian, &length); err != nil {
return nil, err
}
nameBytes := make([]byte, length)
if _, err := io.ReadFull(r, nameBytes); err != nil {
return nil, err
}
name := string(nameBytes)
if name != strings.ToLower(name) {
return nil, UnlowercasedHeaderName
}
if h[name] != nil {
return nil, DuplicateHeaders
}
if err := binary.Read(r, binary.BigEndian, &length); err != nil {
return nil, err
}
value := make([]byte, length)
if _, err := io.ReadFull(r, value); err != nil {
return nil, err
}
valueList := strings.Split(string(value), "\x00", -1)
for _, v := range valueList {
h.Add(name, v)
}
}
return h, nil
}
func (f *Framer) readSynStreamFrame(h ControlFrameHeader, frame *SynStreamFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
if err = binary.Read(f.r, binary.BigEndian, &frame.AssociatedToStreamId); err != nil {
return err
}
if err = binary.Read(f.r, binary.BigEndian, &frame.Priority); err != nil {
return err
}
frame.Priority >>= 14
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 10))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) readSynReplyFrame(h ControlFrameHeader, frame *SynReplyFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
var unused uint16
if err = binary.Read(f.r, binary.BigEndian, &unused); err != nil {
return err
}
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 6))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) readHeadersFrame(h ControlFrameHeader, frame *HeadersFrame) os.Error {
frame.CFHeader = h
var err os.Error
if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
var unused uint16
if err = binary.Read(f.r, binary.BigEndian, &unused); err != nil {
return err
}
reader := f.r
if !f.headerCompressionDisabled {
f.uncorkHeaderDecompressor(int(h.length - 6))
reader = f.headerDecompressor
}
frame.Headers, err = parseHeaderValueBlock(reader)
if err != nil {
return err
}
return nil
}
func (f *Framer) parseDataFrame(streamId uint32) (*DataFrame, os.Error) {
var length uint32
if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
return nil, err
}
var frame DataFrame
frame.StreamId = streamId
frame.Flags = DataFlags(length >> 24)
length &= 0xffffff
frame.Data = make([]byte, length)
// TODO(willchan): Support compressed data frames.
if _, err := io.ReadFull(f.r, frame.Data); err != nil {
return nil, err
}
return &frame, nil
}

0
src/pkg/http/spdy/framer_test.go → src/pkg/http/spdy/spdy_test.go
View File

249
src/pkg/http/spdy/protocol.go → src/pkg/http/spdy/types.go
View File

@ -2,16 +2,15 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package spdy is an incomplete implementation of the SPDY protocol.
//
// The implementation follows draft 2 of the spec:
// https://sites.google.com/a/chromium.org/dev/spdy/spdy-protocol/spdy-protocol-draft2
package spdy
import (
"encoding/binary"
"bytes"
"compress/zlib"
"http"
"io"
"os"
"strconv"
)
// Data Frame Format
@ -193,14 +192,6 @@ type SynStreamFrame struct {
Headers http.Header
}
func (frame *SynStreamFrame) write(f *Framer) os.Error {
return f.writeSynStreamFrame(frame)
}
func (frame *SynStreamFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readSynStreamFrame(h, frame)
}
// SynReplyFrame is the unpacked, in-memory representation of a SYN_REPLY frame.
type SynReplyFrame struct {
CFHeader ControlFrameHeader
@ -208,14 +199,6 @@ type SynReplyFrame struct {
Headers http.Header
}
func (frame *SynReplyFrame) write(f *Framer) os.Error {
return f.writeSynReplyFrame(frame)
}
func (frame *SynReplyFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readSynReplyFrame(h, frame)
}
// StatusCode represents the status that led to a RST_STREAM
type StatusCode uint32
@ -237,35 +220,6 @@ type RstStreamFrame struct {
Status StatusCode
}
func (frame *RstStreamFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeRstStream
frame.CFHeader.length = 8
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.Status); err != nil {
return
}
return
}
func (frame *RstStreamFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
return err
}
if err := binary.Read(f.r, binary.BigEndian, &frame.Status); err != nil {
return err
}
return nil
}
// SettingsFlag represents a flag in a SETTINGS frame.
type SettingsFlag uint8
@ -300,126 +254,23 @@ type SettingsFrame struct {
FlagIdValues []SettingsFlagIdValue
}
func (frame *SettingsFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSettings
frame.CFHeader.length = uint32(len(frame.FlagIdValues)*8 + 4)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint32(len(frame.FlagIdValues))); err != nil {
return
}
for _, flagIdValue := range frame.FlagIdValues {
flagId := (uint32(flagIdValue.Flag) << 24) | uint32(flagIdValue.Id)
if err = binary.Write(f.w, binary.BigEndian, flagId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, flagIdValue.Value); err != nil {
return
}
}
return
}
func (frame *SettingsFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
var numSettings uint32
if err := binary.Read(f.r, binary.BigEndian, &numSettings); err != nil {
return err
}
frame.FlagIdValues = make([]SettingsFlagIdValue, numSettings)
for i := uint32(0); i < numSettings; i++ {
if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Id); err != nil {
return err
}
frame.FlagIdValues[i].Flag = SettingsFlag((frame.FlagIdValues[i].Id & 0xff000000) >> 24)
frame.FlagIdValues[i].Id &= 0xffffff
if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Value); err != nil {
return err
}
}
return nil
}
// NoopFrame is the unpacked, in-memory representation of a NOOP frame.
type NoopFrame struct {
CFHeader ControlFrameHeader
}
func (frame *NoopFrame) write(f *Framer) os.Error {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeNoop
// Serialize frame to Writer
return writeControlFrameHeader(f.w, frame.CFHeader)
}
func (frame *NoopFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
return nil
}
// PingFrame is the unpacked, in-memory representation of a PING frame.
type PingFrame struct {
CFHeader ControlFrameHeader
Id uint32
}
func (frame *PingFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypePing
frame.CFHeader.length = 4
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.Id); err != nil {
return
}
return
}
func (frame *PingFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.Id); err != nil {
return err
}
return nil
}
// GoAwayFrame is the unpacked, in-memory representation of a GOAWAY frame.
type GoAwayFrame struct {
CFHeader ControlFrameHeader
LastGoodStreamId uint32
}
func (frame *GoAwayFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeGoAway
frame.CFHeader.length = 4
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.LastGoodStreamId); err != nil {
return
}
return nil
}
func (frame *GoAwayFrame) read(h ControlFrameHeader, f *Framer) os.Error {
frame.CFHeader = h
if err := binary.Read(f.r, binary.BigEndian, &frame.LastGoodStreamId); err != nil {
return err
}
return nil
}
// HeadersFrame is the unpacked, in-memory representation of a HEADERS frame.
type HeadersFrame struct {
CFHeader ControlFrameHeader
@ -427,34 +278,6 @@ type HeadersFrame struct {
Headers http.Header
}
func (frame *HeadersFrame) write(f *Framer) os.Error {
return f.writeHeadersFrame(frame)
}
func (frame *HeadersFrame) read(h ControlFrameHeader, f *Framer) os.Error {
return f.readHeadersFrame(h, frame)
}
func newControlFrame(frameType ControlFrameType) (controlFrame, os.Error) {
ctor, ok := cframeCtor[frameType]
if !ok {
return nil, InvalidControlFrame
}
return ctor(), nil
}
var cframeCtor = map[ControlFrameType]func() controlFrame{
TypeSynStream: func() controlFrame { return new(SynStreamFrame) },
TypeSynReply: func() controlFrame { return new(SynReplyFrame) },
TypeRstStream: func() controlFrame { return new(RstStreamFrame) },
TypeSettings: func() controlFrame { return new(SettingsFrame) },
TypeNoop: func() controlFrame { return new(NoopFrame) },
TypePing: func() controlFrame { return new(PingFrame) },
TypeGoAway: func() controlFrame { return new(GoAwayFrame) },
TypeHeaders: func() controlFrame { return new(HeadersFrame) },
// TODO(willchan): Add TypeWindowUpdate
}
// DataFrame is the unpacked, in-memory representation of a DATA frame.
type DataFrame struct {
// Note, high bit is the "Control" bit. Should be 0 for data frames.
@ -463,10 +286,6 @@ type DataFrame struct {
Data []byte
}
func (frame *DataFrame) write(f *Framer) os.Error {
return f.writeDataFrame(frame)
}
// HeaderDictionary is the dictionary sent to the zlib compressor/decompressor.
// Even though the specification states there is no null byte at the end, Chrome sends it.
const HeaderDictionary = "optionsgetheadpostputdeletetrace" +
@ -482,3 +301,63 @@ const HeaderDictionary = "optionsgetheadpostputdeletetrace" +
"JanFebMarAprMayJunJulAugSepOctNovDec" +
"chunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplication/xhtmltext/plainpublicmax-age" +
"charset=iso-8859-1utf-8gzipdeflateHTTP/1.1statusversionurl\x00"
type FramerError int
const (
Internal FramerError = iota
InvalidControlFrame
UnlowercasedHeaderName
DuplicateHeaders
UnknownFrameType
InvalidDataFrame
)
func (e FramerError) String() string {
switch e {
case Internal:
return "Internal"
case InvalidControlFrame:
return "InvalidControlFrame"
case UnlowercasedHeaderName:
return "UnlowercasedHeaderName"
case DuplicateHeaders:
return "DuplicateHeaders"
case UnknownFrameType:
return "UnknownFrameType"
case InvalidDataFrame:
return "InvalidDataFrame"
}
return "Error(" + strconv.Itoa(int(e)) + ")"
}
// Framer handles serializing/deserializing SPDY frames, including compressing/
// decompressing payloads.
type Framer struct {
headerCompressionDisabled bool
w io.Writer
headerBuf *bytes.Buffer
headerCompressor *zlib.Writer
r io.Reader
headerReader corkedReader
headerDecompressor io.ReadCloser
}
// NewFramer allocates a new Framer for a given SPDY connection, repesented by
// a io.Writer and io.Reader. Note that Framer will read and write individual fields
// from/to the Reader and Writer, so the caller should pass in an appropriately
// buffered implementation to optimize performance.
func NewFramer(w io.Writer, r io.Reader) (*Framer, os.Error) {
compressBuf := new(bytes.Buffer)
compressor, err := zlib.NewWriterDict(compressBuf, zlib.BestCompression, []byte(HeaderDictionary))
if err != nil {
return nil, err
}
framer := &Framer{
w: w,
headerBuf: compressBuf,
headerCompressor: compressor,
r: r,
}
return framer, nil
}

287
src/pkg/http/spdy/write.go Normal file
View File

@ -0,0 +1,287 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package spdy
import (
"encoding/binary"
"http"
"io"
"os"
"strings"
)
func (frame *SynStreamFrame) write(f *Framer) os.Error {
return f.writeSynStreamFrame(frame)
}
func (frame *SynReplyFrame) write(f *Framer) os.Error {
return f.writeSynReplyFrame(frame)
}
func (frame *RstStreamFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeRstStream
frame.CFHeader.length = 8
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.Status); err != nil {
return
}
return
}
func (frame *SettingsFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSettings
frame.CFHeader.length = uint32(len(frame.FlagIdValues)*8 + 4)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint32(len(frame.FlagIdValues))); err != nil {
return
}
for _, flagIdValue := range frame.FlagIdValues {
flagId := (uint32(flagIdValue.Flag) << 24) | uint32(flagIdValue.Id)
if err = binary.Write(f.w, binary.BigEndian, flagId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, flagIdValue.Value); err != nil {
return
}
}
return
}
func (frame *NoopFrame) write(f *Framer) os.Error {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeNoop
// Serialize frame to Writer
return writeControlFrameHeader(f.w, frame.CFHeader)
}
func (frame *PingFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypePing
frame.CFHeader.length = 4
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.Id); err != nil {
return
}
return
}
func (frame *GoAwayFrame) write(f *Framer) (err os.Error) {
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeGoAway
frame.CFHeader.length = 4
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.LastGoodStreamId); err != nil {
return
}
return nil
}
func (frame *HeadersFrame) write(f *Framer) os.Error {
return f.writeHeadersFrame(frame)
}
func (frame *DataFrame) write(f *Framer) os.Error {
return f.writeDataFrame(frame)
}
// WriteFrame writes a frame.
func (f *Framer) WriteFrame(frame Frame) os.Error {
return frame.write(f)
}
func writeControlFrameHeader(w io.Writer, h ControlFrameHeader) os.Error {
if err := binary.Write(w, binary.BigEndian, 0x8000|h.version); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, h.frameType); err != nil {
return err
}
flagsAndLength := (uint32(h.Flags) << 24) | h.length
if err := binary.Write(w, binary.BigEndian, flagsAndLength); err != nil {
return err
}
return nil
}
func writeHeaderValueBlock(w io.Writer, h http.Header) (n int, err os.Error) {
n = 0
if err = binary.Write(w, binary.BigEndian, uint16(len(h))); err != nil {
return
}
n += 2
for name, values := range h {
if err = binary.Write(w, binary.BigEndian, uint16(len(name))); err != nil {
return
}
n += 2
name = strings.ToLower(name)
if _, err = io.WriteString(w, name); err != nil {
return
}
n += len(name)
v := strings.Join(values, "\x00")
if err = binary.Write(w, binary.BigEndian, uint16(len(v))); err != nil {
return
}
n += 2
if _, err = io.WriteString(w, v); err != nil {
return
}
n += len(v)
}
return
}
func (f *Framer) writeSynStreamFrame(frame *SynStreamFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSynStream
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 10)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.AssociatedToStreamId); err != nil {
return err
}
if err = binary.Write(f.w, binary.BigEndian, frame.Priority<<14); err != nil {
return err
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return err
}
f.headerBuf.Reset()
return nil
}
func (f *Framer) writeSynReplyFrame(frame *SynReplyFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeSynReply
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 6)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint16(0)); err != nil {
return
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return
}
f.headerBuf.Reset()
return
}
func (f *Framer) writeHeadersFrame(frame *HeadersFrame) (err os.Error) {
// Marshal the headers.
var writer io.Writer = f.headerBuf
if !f.headerCompressionDisabled {
writer = f.headerCompressor
}
if _, err = writeHeaderValueBlock(writer, frame.Headers); err != nil {
return
}
if !f.headerCompressionDisabled {
f.headerCompressor.Flush()
}
// Set ControlFrameHeader
frame.CFHeader.version = Version
frame.CFHeader.frameType = TypeHeaders
frame.CFHeader.length = uint32(len(f.headerBuf.Bytes()) + 6)
// Serialize frame to Writer
if err = writeControlFrameHeader(f.w, frame.CFHeader); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
if err = binary.Write(f.w, binary.BigEndian, uint16(0)); err != nil {
return
}
if _, err = f.w.Write(f.headerBuf.Bytes()); err != nil {
return
}
f.headerBuf.Reset()
return
}
func (f *Framer) writeDataFrame(frame *DataFrame) (err os.Error) {
// Validate DataFrame
if frame.StreamId&0x80000000 != 0 || len(frame.Data) >= 0x0f000000 {
return InvalidDataFrame
}
// TODO(willchan): Support data compression.
// Serialize frame to Writer
if err = binary.Write(f.w, binary.BigEndian, frame.StreamId); err != nil {
return
}
flagsAndLength := (uint32(frame.Flags) << 24) | uint32(len(frame.Data))
if err = binary.Write(f.w, binary.BigEndian, flagsAndLength); err != nil {
return
}
if _, err = f.w.Write(frame.Data); err != nil {
return
}
return nil
}