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Refactor compression support, now at message level.

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This commit is contained in:
Jakob Borg 2014-07-28 11:31:22 +02:00
parent 6a441d5013
commit 6c5c14f35f
8 changed files with 418 additions and 249 deletions
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69
protocol/PROTOCOL.md
View File

@ -25,13 +25,11 @@ Transport and Authentication
----------------------------
BEP is deployed as the highest level in a protocol stack, with the lower
level protocols providing compression, encryption and authentication.
level protocols providing encryption and authentication.
+-----------------------------|
| Block Exchange Protocol |
|-----------------------------|
| Compression (LZ4) |
|-----------------------------|
| Encryption & Auth (TLS 1.2) |
|-----------------------------|
| TCP |
@ -62,48 +60,19 @@ requests are received.
The underlying transport protocol MUST be TCP.
Compression
-----------
All data is sent within compressed blocks. Blocks are compressed using
the LZ4 format and algorithm described in
https://code.google.com/p/lz4/. Each compressed block is preceded by a
header consisting of three 32 bit words, in network order (big endian):
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Magic (0x0x5e63b278) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Uncompressed Block Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ /
\ Compressed Data \
/ /
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Data Length indicates the length of data following the Data Length
field until the next header, i.e. the length of the Compressed Data
section plus four bytes for the Uncompressed Block Length field. The
Uncompressed Block Length indicates the amount of data that will result
when decompressing the Compressed Data section.
A single BEP message SHOULD be sent as a single compressed block. A
single compressed block MAY NOT contain more than one BEP message.
Messages
--------
Every message starts with one 32 bit word indicating the message
version, type and ID. The header is in network byte order, i.e. big
endian.
version, type and ID, followed by the length of the message. The header
is in network byte order, i.e. big endian.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Message ID | Type | Reserved |
| Ver | Message ID | Type | Reserved |C|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
For BEP v1 the Version field is set to zero. Future versions with
@ -125,10 +94,28 @@ The Type field indicates the type of data following the message header
and is one of the integers defined below. A message of an unknown type
is a protocol error and MUST result in the connection being terminated.
All data following the message header MUST be in XDR (RFC 1014)
encoding. All fields shorter than 32 bits and all variable length data
MUST be padded to a multiple of 32 bits. The actual data types in use by
BEP, in XDR naming convention, are the following:
The Compression bit "C" indicates the compression used for the message.
For C=1:
* The Length field contains the length, in bytes, of the
compressed message data.
* The message data is compressed using the LZ4 format and algorithm
described in https://code.google.com/p/lz4/.
For C=0:
* The Length field contains the length, in bytes, of the
uncompressed message data.
* The message is not compressed.
All data within the the message (post decompression, if compression is
in use) MUST be in XDR (RFC 1014) encoding. All fields shorter than 32
bits and all variable length data MUST be padded to a multiple of 32
bits. The actual data types in use by BEP, in XDR naming convention, are
the following:
- (unsigned) int -- (unsigned) 32 bit integer
- (unsigned) hyper -- (unsigned) 64 bit integer

17
protocol/counting.go
View File

@ -7,11 +7,13 @@ package protocol
import (
"io"
"sync/atomic"
"time"
)
type countingReader struct {
io.Reader
tot uint64
tot uint64 // bytes
last int64 // unix nanos
}
var (
@ -23,6 +25,7 @@ func (c *countingReader) Read(bs []byte) (int, error) {
n, err := c.Reader.Read(bs)
atomic.AddUint64(&c.tot, uint64(n))
atomic.AddUint64(&totalIncoming, uint64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
@ -30,15 +33,21 @@ func (c *countingReader) Tot() uint64 {
return atomic.LoadUint64(&c.tot)
}
func (c *countingReader) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
type countingWriter struct {
io.Writer
tot uint64
tot uint64 // bytes
last int64 // unix nanos
}
func (c *countingWriter) Write(bs []byte) (int, error) {
n, err := c.Writer.Write(bs)
atomic.AddUint64(&c.tot, uint64(n))
atomic.AddUint64(&totalOutgoing, uint64(n))
atomic.StoreInt64(&c.last, time.Now().UnixNano())
return n, err
}
@ -46,6 +55,10 @@ func (c *countingWriter) Tot() uint64 {
return atomic.LoadUint64(&c.tot)
}
func (c *countingWriter) Last() time.Time {
return time.Unix(0, atomic.LoadInt64(&c.last))
}
func TotalInOut() (uint64, uint64) {
return atomic.LoadUint64(&totalIncoming), atomic.LoadUint64(&totalOutgoing)
}

21
protocol/header.go
View File

@ -7,9 +7,10 @@ package protocol
import "github.com/calmh/syncthing/xdr"
type header struct {
version int
msgID int
msgType int
version int
msgID int
msgType int
compression bool
}
func (h header) encodeXDR(xw *xdr.Writer) (int, error) {
@ -24,15 +25,21 @@ func (h *header) decodeXDR(xr *xdr.Reader) error {
}
func encodeHeader(h header) uint32 {
var isComp uint32
if h.compression {
isComp = 1 << 0 // the zeroth bit is the compression bit
}
return uint32(h.version&0xf)<<28 +
uint32(h.msgID&0xfff)<<16 +
uint32(h.msgType&0xff)<<8
uint32(h.msgType&0xff)<<8 +
isComp
}
func decodeHeader(u uint32) header {
return header{
version: int(u>>28) & 0xf,
msgID: int(u>>16) & 0xfff,
msgType: int(u>>8) & 0xff,
version: int(u>>28) & 0xf,
msgID: int(u>>16) & 0xfff,
msgType: int(u>>8) & 0xff,
compression: u&1 == 1,
}
}

6
protocol/message.go
View File

@ -49,6 +49,10 @@ type RequestMessage struct {
Size uint32
}
type ResponseMessage struct {
Data []byte
}
type ClusterConfigMessage struct {
ClientName string // max:64
ClientVersion string // max:64
@ -75,3 +79,5 @@ type Option struct {
type CloseMessage struct {
Reason string // max:1024
}
type EmptyMessage struct{}

107
protocol/message_xdr.go
View File

@ -348,6 +348,64 @@ func (o *RequestMessage) decodeXDR(xr *xdr.Reader) error {
/*
ResponseMessage Structure:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length of Data |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ /
\ Data (variable length) \
/ /
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
struct ResponseMessage {
opaque Data<>;
}
*/
func (o ResponseMessage) EncodeXDR(w io.Writer) (int, error) {
var xw = xdr.NewWriter(w)
return o.encodeXDR(xw)
}
func (o ResponseMessage) MarshalXDR() []byte {
return o.AppendXDR(make([]byte, 0, 128))
}
func (o ResponseMessage) AppendXDR(bs []byte) []byte {
var aw = xdr.AppendWriter(bs)
var xw = xdr.NewWriter(&aw)
o.encodeXDR(xw)
return []byte(aw)
}
func (o ResponseMessage) encodeXDR(xw *xdr.Writer) (int, error) {
xw.WriteBytes(o.Data)
return xw.Tot(), xw.Error()
}
func (o *ResponseMessage) DecodeXDR(r io.Reader) error {
xr := xdr.NewReader(r)
return o.decodeXDR(xr)
}
func (o *ResponseMessage) UnmarshalXDR(bs []byte) error {
var br = bytes.NewReader(bs)
var xr = xdr.NewReader(br)
return o.decodeXDR(xr)
}
func (o *ResponseMessage) decodeXDR(xr *xdr.Reader) error {
o.Data = xr.ReadBytes()
return xr.Error()
}
/*
ClusterConfigMessage Structure:
0 1 2 3
@ -752,3 +810,52 @@ func (o *CloseMessage) decodeXDR(xr *xdr.Reader) error {
o.Reason = xr.ReadStringMax(1024)
return xr.Error()
}
/*
EmptyMessage Structure:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
struct EmptyMessage {
}
*/
func (o EmptyMessage) EncodeXDR(w io.Writer) (int, error) {
var xw = xdr.NewWriter(w)
return o.encodeXDR(xw)
}
func (o EmptyMessage) MarshalXDR() []byte {
return o.AppendXDR(make([]byte, 0, 128))
}
func (o EmptyMessage) AppendXDR(bs []byte) []byte {
var aw = xdr.AppendWriter(bs)
var xw = xdr.NewWriter(&aw)
o.encodeXDR(xw)
return []byte(aw)
}
func (o EmptyMessage) encodeXDR(xw *xdr.Writer) (int, error) {
return xw.Tot(), xw.Error()
}
func (o *EmptyMessage) DecodeXDR(r io.Reader) error {
xr := xdr.NewReader(r)
return o.decodeXDR(xr)
}
func (o *EmptyMessage) UnmarshalXDR(bs []byte) error {
var br = bytes.NewReader(bs)
var xr = xdr.NewReader(br)
return o.decodeXDR(xr)
}
func (o *EmptyMessage) decodeXDR(xr *xdr.Reader) error {
return xr.Error()
}

363
protocol/protocol.go
View File

@ -6,16 +6,21 @@ package protocol
import (
"bufio"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"sync"
"time"
"github.com/calmh/syncthing/xdr"
lz4 "github.com/bkaradzic/go-lz4"
)
const BlockSize = 128 * 1024
const (
BlockSize = 128 * 1024
MinCompressedSize = 128 // message must be this big to enable compression
)
const (
messageTypeClusterConfig = 0
@ -82,21 +87,22 @@ type rawConnection struct {
state int
cr *countingReader
xr *xdr.Reader
cw *countingWriter
wb *bufio.Writer
xw *xdr.Writer
awaiting []chan asyncResult
awaiting [4096]chan asyncResult
awaitingMut sync.Mutex
idxMut sync.Mutex // ensures serialization of Index calls
nextID chan int
outbox chan []encodable
outbox chan hdrMsg
closed chan struct{}
once sync.Once
rdbuf0 []byte // used & reused by readMessage
rdbuf1 []byte // used & reused by readMessage
}
type asyncResult struct {
@ -104,36 +110,32 @@ type asyncResult struct {
err error
}
type hdrMsg struct {
hdr header
msg encodable
}
type encodable interface {
AppendXDR([]byte) []byte
}
const (
pingTimeout = 30 * time.Second
pingIdleTime = 60 * time.Second
)
func NewConnection(nodeID NodeID, reader io.Reader, writer io.Writer, receiver Model, name string) Connection {
// Byte counters are at the lowest level, counting compressed bytes
cr := &countingReader{Reader: reader}
cw := &countingWriter{Writer: writer}
// Compression is just above counting
zr := newLZ4Reader(cr)
zw := newLZ4Writer(cw)
// We buffer writes on top of compression.
// The LZ4 reader is already internally buffered
wb := bufio.NewWriterSize(zw, 65536)
c := rawConnection{
id: nodeID,
name: name,
receiver: nativeModel{receiver},
state: stateInitial,
cr: cr,
xr: xdr.NewReader(zr),
cw: cw,
wb: wb,
xw: xdr.NewWriter(wb),
awaiting: make([]chan asyncResult, 0x1000),
outbox: make(chan []encodable),
outbox: make(chan hdrMsg),
nextID: make(chan int),
closed: make(chan struct{}),
}
@ -162,7 +164,7 @@ func (c *rawConnection) Index(repo string, idx []FileInfo) error {
default:
}
c.idxMut.Lock()
c.send(header{0, -1, messageTypeIndex}, IndexMessage{repo, idx})
c.send(-1, messageTypeIndex, IndexMessage{repo, idx})
c.idxMut.Unlock()
return nil
}
@ -175,7 +177,7 @@ func (c *rawConnection) IndexUpdate(repo string, idx []FileInfo) error {
default:
}
c.idxMut.Lock()
c.send(header{0, -1, messageTypeIndexUpdate}, IndexMessage{repo, idx})
c.send(-1, messageTypeIndexUpdate, IndexMessage{repo, idx})
c.idxMut.Unlock()
return nil
}
@ -197,8 +199,7 @@ func (c *rawConnection) Request(repo string, name string, offset int64, size int
c.awaiting[id] = rc
c.awaitingMut.Unlock()
ok := c.send(header{0, id, messageTypeRequest},
RequestMessage{repo, name, uint64(offset), uint32(size)})
ok := c.send(id, messageTypeRequest, RequestMessage{repo, name, uint64(offset), uint32(size)})
if !ok {
return nil, ErrClosed
}
@ -212,7 +213,7 @@ func (c *rawConnection) Request(repo string, name string, offset int64, size int
// ClusterConfig send the cluster configuration message to the peer and returns any error
func (c *rawConnection) ClusterConfig(config ClusterConfigMessage) {
c.send(header{0, -1, messageTypeClusterConfig}, config)
c.send(-1, messageTypeClusterConfig, config)
}
func (c *rawConnection) ping() bool {
@ -228,7 +229,7 @@ func (c *rawConnection) ping() bool {
c.awaiting[id] = rc
c.awaitingMut.Unlock()
ok := c.send(header{0, id, messageTypePing})
ok := c.send(id, messageTypePing, nil)
if !ok {
return false
}
@ -249,68 +250,53 @@ func (c *rawConnection) readerLoop() (err error) {
default:
}
var hdr header
hdr.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
hdr, msg, err := c.readMessage()
if err != nil {
return err
}
if hdr.version != 0 {
return fmt.Errorf("protocol error: %s: unknown message version %#x", c.id, hdr.version)
}
switch hdr.msgType {
case messageTypeIndex:
if c.state < stateCCRcvd {
return fmt.Errorf("protocol error: index message in state %d", c.state)
}
if err := c.handleIndex(); err != nil {
return err
}
c.handleIndex(msg.(IndexMessage))
c.state = stateIdxRcvd
case messageTypeIndexUpdate:
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: index update message in state %d", c.state)
}
if err := c.handleIndexUpdate(); err != nil {
return err
}
c.handleIndexUpdate(msg.(IndexMessage))
case messageTypeRequest:
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: request message in state %d", c.state)
}
if err := c.handleRequest(hdr); err != nil {
return err
}
// Requests are handled asynchronously
go c.handleRequest(hdr.msgID, msg.(RequestMessage))
case messageTypeResponse:
if c.state < stateIdxRcvd {
return fmt.Errorf("protocol error: response message in state %d", c.state)
}
if err := c.handleResponse(hdr); err != nil {
return err
}
c.handleResponse(hdr.msgID, msg.(ResponseMessage))
case messageTypePing:
c.send(header{0, hdr.msgID, messageTypePong})
c.send(hdr.msgID, messageTypePong, EmptyMessage{})
case messageTypePong:
c.handlePong(hdr)
c.handlePong(hdr.msgID)
case messageTypeClusterConfig:
if c.state != stateInitial {
return fmt.Errorf("protocol error: cluster config message in state %d", c.state)
}
if err := c.handleClusterConfig(); err != nil {
return err
}
go c.receiver.ClusterConfig(c.id, msg.(ClusterConfigMessage))
c.state = stateCCRcvd
case messageTypeClose:
if err := c.handleClose(); err != nil {
return err
}
return errors.New(msg.(CloseMessage).Reason)
default:
return fmt.Errorf("protocol error: %s: unknown message type %#x", c.id, hdr.msgType)
@ -318,114 +304,153 @@ func (c *rawConnection) readerLoop() (err error) {
}
}
func (c *rawConnection) handleIndex() error {
var im IndexMessage
im.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
return err
func (c *rawConnection) readMessage() (hdr header, msg encodable, err error) {
if cap(c.rdbuf0) < 8 {
c.rdbuf0 = make([]byte, 8)
} else {
if debug {
l.Debugf("Index(%v, %v, %d files)", c.id, im.Repository, len(im.Files))
}
c.receiver.Index(c.id, im.Repository, im.Files)
c.rdbuf0 = c.rdbuf0[:8]
}
_, err = io.ReadFull(c.cr, c.rdbuf0)
if err != nil {
return
}
return nil
}
func (c *rawConnection) handleIndexUpdate() error {
var im IndexMessage
im.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
return err
hdr = decodeHeader(binary.BigEndian.Uint32(c.rdbuf0[0:4]))
msglen := int(binary.BigEndian.Uint32(c.rdbuf0[4:8]))
if debug {
l.Debugf("read header %v (msglen=%d)", hdr, msglen)
}
if cap(c.rdbuf0) < msglen {
c.rdbuf0 = make([]byte, msglen)
} else {
if debug {
l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Repository, len(im.Files))
c.rdbuf0 = c.rdbuf0[:msglen]
}
_, err = io.ReadFull(c.cr, c.rdbuf0)
if err != nil {
return
}
if debug {
l.Debugf("read %d bytes", len(c.rdbuf0))
}
msgBuf := c.rdbuf0
if hdr.compression {
c.rdbuf1 = c.rdbuf1[:cap(c.rdbuf1)]
c.rdbuf1, err = lz4.Decode(c.rdbuf1, c.rdbuf0)
if err != nil {
return
}
msgBuf = c.rdbuf1
if debug {
l.Debugf("decompressed to %d bytes", len(msgBuf))
}
c.receiver.IndexUpdate(c.id, im.Repository, im.Files)
}
return nil
if debug {
if len(msgBuf) > 1024 {
l.Debugf("message data:\n%s", hex.Dump(msgBuf[:1024]))
} else {
l.Debugf("message data:\n%s", hex.Dump(msgBuf))
}
}
switch hdr.msgType {
case messageTypeIndex, messageTypeIndexUpdate:
var idx IndexMessage
err = idx.UnmarshalXDR(msgBuf)
msg = idx
case messageTypeRequest:
var req RequestMessage
err = req.UnmarshalXDR(msgBuf)
msg = req
case messageTypeResponse:
var resp ResponseMessage
err = resp.UnmarshalXDR(msgBuf)
msg = resp
case messageTypePing, messageTypePong:
msg = EmptyMessage{}
case messageTypeClusterConfig:
var cc ClusterConfigMessage
err = cc.UnmarshalXDR(msgBuf)
msg = cc
case messageTypeClose:
var cm CloseMessage
err = cm.UnmarshalXDR(msgBuf)
msg = cm
default:
err = fmt.Errorf("protocol error: %s: unknown message type %#x", c.id, hdr.msgType)
}
return
}
func (c *rawConnection) handleRequest(hdr header) error {
var req RequestMessage
req.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
return err
func (c *rawConnection) handleIndex(im IndexMessage) {
if debug {
l.Debugf("Index(%v, %v, %d files)", c.id, im.Repository, len(im.Files))
}
go c.processRequest(hdr.msgID, req)
return nil
c.receiver.Index(c.id, im.Repository, im.Files)
}
func (c *rawConnection) handleResponse(hdr header) error {
data := c.xr.ReadBytesMax(256 * 1024) // Sufficiently larger than max expected block size
if err := c.xr.Error(); err != nil {
return err
func (c *rawConnection) handleIndexUpdate(im IndexMessage) {
if debug {
l.Debugf("queueing IndexUpdate(%v, %v, %d files)", c.id, im.Repository, len(im.Files))
}
c.receiver.IndexUpdate(c.id, im.Repository, im.Files)
}
func (c *rawConnection) handleRequest(msgID int, req RequestMessage) {
data, _ := c.receiver.Request(c.id, req.Repository, req.Name, int64(req.Offset), int(req.Size))
c.send(msgID, messageTypeResponse, ResponseMessage{data})
}
func (c *rawConnection) handleResponse(msgID int, resp ResponseMessage) {
c.awaitingMut.Lock()
if rc := c.awaiting[hdr.msgID]; rc != nil {
c.awaiting[hdr.msgID] = nil
rc <- asyncResult{data, nil}
if rc := c.awaiting[msgID]; rc != nil {
c.awaiting[msgID] = nil
rc <- asyncResult{resp.Data, nil}
close(rc)
}
c.awaitingMut.Unlock()
return nil
}
func (c *rawConnection) handlePong(hdr header) {
func (c *rawConnection) handlePong(msgID int) {
c.awaitingMut.Lock()
if rc := c.awaiting[hdr.msgID]; rc != nil {
c.awaiting[hdr.msgID] = nil
if rc := c.awaiting[msgID]; rc != nil {
c.awaiting[msgID] = nil
rc <- asyncResult{}
close(rc)
}
c.awaitingMut.Unlock()
}
func (c *rawConnection) handleClusterConfig() error {
var cm ClusterConfigMessage
cm.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
return err
} else {
go c.receiver.ClusterConfig(c.id, cm)
}
return nil
}
func (c *rawConnection) handleClose() error {
var cm CloseMessage
cm.decodeXDR(c.xr)
if err := c.xr.Error(); err != nil {
return err
}
return errors.New(cm.Reason)
}
type encodable interface {
encodeXDR(*xdr.Writer) (int, error)
}
type encodableBytes []byte
func (e encodableBytes) encodeXDR(xw *xdr.Writer) (int, error) {
return xw.WriteBytes(e)
}
func (c *rawConnection) send(h header, es ...encodable) bool {
if h.msgID < 0 {
func (c *rawConnection) send(msgID int, msgType int, msg encodable) bool {
if msgID < 0 {
select {
case id := <-c.nextID:
h.msgID = id
msgID = id
case <-c.closed:
return false
}
}
msg := append([]encodable{h}, es...)
hdr := header{
version: 0,
msgID: msgID,
msgType: msgType,
}
select {
case c.outbox <- msg:
case c.outbox <- hdrMsg{hdr, msg}:
return true
case <-c.closed:
return false
@ -433,13 +458,71 @@ func (c *rawConnection) send(h header, es ...encodable) bool {
}
func (c *rawConnection) writerLoop() {
var msgBuf = make([]byte, 8) // buffer for wire format message, kept and reused
var uncBuf []byte // buffer for uncompressed message, kept and reused
for {
var tempBuf []byte
var err error
select {
case es := <-c.outbox:
for _, e := range es {
e.encodeXDR(c.xw)
case hm := <-c.outbox:
if hm.msg != nil {
// Uncompressed message in uncBuf
uncBuf = hm.msg.AppendXDR(uncBuf[:0])
if len(uncBuf) >= MinCompressedSize {
// Use compression for large messages
hm.hdr.compression = true
// Make sure we have enough space for the compressed message plus header in msgBug
msgBuf = msgBuf[:cap(msgBuf)]
if maxLen := lz4.CompressBound(len(uncBuf)) + 8; maxLen > len(msgBuf) {
msgBuf = make([]byte, maxLen)
}
// Compressed is written to msgBuf, we keep tb for the length only
tempBuf, err = lz4.Encode(msgBuf[8:], uncBuf)
binary.BigEndian.PutUint32(msgBuf[4:8], uint32(len(tempBuf)))
msgBuf = msgBuf[0 : len(tempBuf)+8]
if debug {
l.Debugf("write compressed message; %v (len=%d)", hm.hdr, len(tempBuf))
}
} else {
// No point in compressing very short messages
hm.hdr.compression = false
msgBuf = msgBuf[:cap(msgBuf)]
if l := len(uncBuf) + 8; l > len(msgBuf) {
msgBuf = make([]byte, l)
}
binary.BigEndian.PutUint32(msgBuf[4:8], uint32(len(uncBuf)))
msgBuf = msgBuf[0 : len(uncBuf)+8]
copy(msgBuf[8:], uncBuf)
if debug {
l.Debugf("write uncompressed message; %v (len=%d)", hm.hdr, len(uncBuf))
}
}
} else {
if debug {
l.Debugf("write empty message; %v", hm.hdr)
}
binary.BigEndian.PutUint32(msgBuf[4:8], 0)
msgBuf = msgBuf[:8]
}
if err := c.flush(); err != nil {
binary.BigEndian.PutUint32(msgBuf[0:4], encodeHeader(hm.hdr))
if err == nil {
var n int
n, err = c.cw.Write(msgBuf)
if debug {
l.Debugf("wrote %d bytes on the wire", n)
}
}
if err != nil {
c.close(err)
return
}
@ -449,16 +532,6 @@ func (c *rawConnection) writerLoop() {
}
}
func (c *rawConnection) flush() error {
if err := c.xw.Error(); err != nil {
return err
}
if err := c.wb.Flush(); err != nil {
return err
}
return nil
}
func (c *rawConnection) close(err error) {
c.once.Do(func() {
close(c.closed)
@ -494,13 +567,13 @@ func (c *rawConnection) pingerLoop() {
for {
select {
case <-ticker:
if d := time.Since(c.xr.LastRead()); d < pingIdleTime {
if d := time.Since(c.cr.Last()); d < pingIdleTime {
if debug {
l.Debugln(c.id, "ping skipped after rd", d)
}
continue
}
if d := time.Since(c.xw.LastWrite()); d < pingIdleTime {
if d := time.Since(c.cw.Last()); d < pingIdleTime {
if debug {
l.Debugln(c.id, "ping skipped after wr", d)
}
@ -532,12 +605,6 @@ func (c *rawConnection) pingerLoop() {
}
}
func (c *rawConnection) processRequest(msgID int, req RequestMessage) {
data, _ := c.receiver.Request(c.id, req.Repository, req.Name, int64(req.Offset), int(req.Size))
c.send(header{0, msgID, messageTypeResponse}, encodableBytes(data))
}
type Statistics struct {
At time.Time
InBytesTotal uint64

58
xdr/reader.go
View File

@ -7,18 +7,15 @@ package xdr
import (
"errors"
"io"
"time"
)
var ErrElementSizeExceeded = errors.New("element size exceeded")
type Reader struct {
r io.Reader
tot int
err error
b [8]byte
sb []byte
last time.Time
r io.Reader
err error
b [8]byte
sb []byte
}
func NewReader(r io.Reader) *Reader {
@ -63,8 +60,6 @@ func (r *Reader) ReadBytesMaxInto(max int, dst []byte) []byte {
if r.err != nil {
return nil
}
r.last = time.Now()
s := r.tot
l := int(r.ReadUint32())
if r.err != nil {
@ -85,17 +80,16 @@ func (r *Reader) ReadBytesMaxInto(max int, dst []byte) []byte {
n, r.err = io.ReadFull(r.r, dst)
if r.err != nil {
if debug {
dl.Debugf("@0x%x: rd bytes (%d): %v", s, len(dst), r.err)
dl.Debugf("rd bytes (%d): %v", len(dst), r.err)
}
return nil
}
r.tot += n
if debug {
if n > maxDebugBytes {
dl.Debugf("@0x%x: rd bytes (%d): %x...", s, len(dst), dst[:maxDebugBytes])
dl.Debugf("rd bytes (%d): %x...", len(dst), dst[:maxDebugBytes])
} else {
dl.Debugf("@0x%x: rd bytes (%d): %x", s, len(dst), dst)
dl.Debugf("rd bytes (%d): %x", len(dst), dst)
}
}
return dst[:l]
@ -113,15 +107,11 @@ func (r *Reader) ReadUint32() uint32 {
if r.err != nil {
return 0
}
r.last = time.Now()
s := r.tot
var n int
n, r.err = io.ReadFull(r.r, r.b[:4])
r.tot += n
_, r.err = io.ReadFull(r.r, r.b[:4])
if r.err != nil {
if debug {
dl.Debugf("@0x%x: rd uint32: %v", r.tot, r.err)
dl.Debugf("rd uint32: %v", r.err)
}
return 0
}
@ -129,7 +119,7 @@ func (r *Reader) ReadUint32() uint32 {
v := uint32(r.b[3]) | uint32(r.b[2])<<8 | uint32(r.b[1])<<16 | uint32(r.b[0])<<24
if debug {
dl.Debugf("@0x%x: rd uint32=%d (0x%08x)", s, v, v)
dl.Debugf("rd uint32=%d (0x%08x)", v, v)
}
return v
}
@ -138,15 +128,11 @@ func (r *Reader) ReadUint64() uint64 {
if r.err != nil {
return 0
}
r.last = time.Now()
s := r.tot
var n int
n, r.err = io.ReadFull(r.r, r.b[:8])
r.tot += n
_, r.err = io.ReadFull(r.r, r.b[:8])
if r.err != nil {
if debug {
dl.Debugf("@0x%x: rd uint64: %v", r.tot, r.err)
dl.Debugf("rd uint64: %v", r.err)
}
return 0
}
@ -155,19 +141,23 @@ func (r *Reader) ReadUint64() uint64 {
uint64(r.b[3])<<32 | uint64(r.b[2])<<40 | uint64(r.b[1])<<48 | uint64(r.b[0])<<56
if debug {
dl.Debugf("@0x%x: rd uint64=%d (0x%016x)", s, v, v)
dl.Debugf("rd uint64=%d (0x%016x)", v, v)
}
return v
}
func (r *Reader) Tot() int {
return r.tot
type XDRError struct {
op string
err error
}
func (e XDRError) Error() string {
return "xdr " + e.op + ": " + e.err.Error()
}
func (r *Reader) Error() error {
return r.err
}
func (r *Reader) LastRead() time.Time {
return r.last
if r.err == nil {
return nil
}
return XDRError{"read", r.err}
}

26
xdr/writer.go
View File

@ -4,10 +4,7 @@
package xdr
import (
"io"
"time"
)
import "io"
func pad(l int) int {
d := l % 4
@ -20,11 +17,10 @@ func pad(l int) int {
var padBytes = []byte{0, 0, 0}
type Writer struct {
w io.Writer
tot int
err error
b [8]byte
last time.Time
w io.Writer
tot int
err error
b [8]byte
}
type AppendWriter []byte
@ -49,7 +45,6 @@ func (w *Writer) WriteBytes(bs []byte) (int, error) {
return 0, w.err
}
w.last = time.Now()
w.WriteUint32(uint32(len(bs)))
if w.err != nil {
return 0, w.err
@ -93,7 +88,6 @@ func (w *Writer) WriteUint32(v uint32) (int, error) {
return 0, w.err
}
w.last = time.Now()
if debug {
dl.Debugf("wr uint32=%d", v)
}
@ -114,7 +108,6 @@ func (w *Writer) WriteUint64(v uint64) (int, error) {
return 0, w.err
}
w.last = time.Now()
if debug {
dl.Debugf("wr uint64=%d", v)
}
@ -139,9 +132,8 @@ func (w *Writer) Tot() int {
}
func (w *Writer) Error() error {
return w.err
}
func (w *Writer) LastWrite() time.Time {
return w.last
if w.err == nil {
return nil
}
return XDRError{"write", w.err}
}