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The Great Rewrite (fixes #36, #61, #94, #101)

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Rewrite of the file model and pulling mechanism. Needs lots of cleanup
and bugfixes, now...
This commit is contained in:
Jakob Borg
2014-03-28 14:36:57 +01:00
parent 3700eb1e61
commit f87b1520e8
47 changed files with 2137 additions and 1902 deletions
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63
protocol/PROTOCOL.md
View File

@@ -19,20 +19,31 @@ File data is described and transferred in units of _blocks_, each being
Transport and Authentication
----------------------------
BEP itself does not provide retransmissions, compression, encryption nor
authentication. It is expected that this is performed at lower layers of
the networking stack. The typical deployment stack is the following:
BEP is deployed as the highest level in a protocol stack, with the lower
level protocols providing compression, encryption and authentication.
The transport protocol is always TCP.
+-----------------------------|
| Block Exchange Protocol |
|-----------------------------|
| Compression (RFC 1951) |
|-----------------------------|
| Encryption & Auth (TLS 1.0) |
| Encryption & Auth (TLS 1.2) |
|-----------------------------|
| TCP |
|-----------------------------|
v v
v ... v
Compression is started directly after a successfull TLS handshake,
before the first message is sent. The compression is flushed at each
message boundary.
The TLS layer shall use a strong cipher suite. Only cipher suites
without known weaknesses and providing Perfect Forward Secrecy (PFS) can
be considered strong. Examples of valid cipher suites are given at the
end of this document. This is not to be taken as an exhaustive list of
allowed cipher suites but represents best practices at the time of
writing.
The exact nature of the authentication is up to the application.
Possibilities include certificates signed by a common trusted CA,
@@ -44,10 +55,6 @@ message type may be sent at any time and the sender need not await a
response to one message before sending another. Responses must however
be sent in the same order as the requests are received.
Compression is started directly after a successfull TLS handshake,
before the first message is sent. The compression is flushed at each
message boundary.
Messages
--------
@@ -134,7 +141,9 @@ response to the Index message.
+ Modified (64 bits) +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version |
| |
+ Version (64 bits) +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Blocks |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -163,14 +172,16 @@ response to the Index message.
The Repository field identifies the repository that the index message
pertains to. For single repository implementations an empty repository
ID is acceptable, or the word "default". The Name is the file name path
relative to the repository root. The Name is always in UTF-8 NFC regardless
of operating system or file system specific conventions. The combination of
Repository and Name uniquely identifies each file in a cluster.
relative to the repository root. The Name is always in UTF-8 NFC
regardless of operating system or file system specific conventions. The
combination of Repository and Name uniquely identifies each file in a
cluster.
The Version field is a counter that is initially zero for each file. It
is incremented each time a change is detected. The combination of
Repository, Name and Version uniquely identifies the contents of a file
at a certain point in time.
The Version field is the value of a cluster wide Lamport clock
indicating when the change was detected. The clock ticks on every
detected and received change. The combination of Repository, Name and
Version uniquely identifies the contents of a file at a certain point in
time.
The Flags field is made up of the following single bit flags:
@@ -220,7 +231,7 @@ block which may represent a smaller amount of data.
string Name<>;
unsigned int Flags;
hyper Modified;
unsigned int Version;
unsigned hyper Version;
BlockInfo Blocks<>;
}
@@ -338,8 +349,8 @@ Well known keys:
- "clientId" -- The name of the implementation. Example: "syncthing".
- "clientVersion" -- The version of the client. Example: "v1.0.33-47". The
Following the SemVer 2.0 specification for version strings is
- "clientVersion" -- The version of the client. Example: "v1.0.33-47".
The Following the SemVer 2.0 specification for version strings is
encouraged but not enforced.
#### Graphical Representation
@@ -411,3 +422,15 @@ their repository contents and transmits an Index Update message (10).
Both peers enter idle state after 10. At some later time 11, peer A
determines that it has not seen data from B for some time and sends a
Ping request. A response is sent at 12.
Examples of Acceptable Cipher Suites
------------------------------------
0x009F DHE-RSA-AES256-GCM-SHA384 (TLSv1.2 DH RSA AESGCM(256) AEAD)
0x006B DHE-RSA-AES256-SHA256 (TLSv1.2 DH RSA AES(256) SHA256)
0xC030 ECDHE-RSA-AES256-GCM-SHA384 (TLSv1.2 ECDH RSA AESGCM(256) AEAD)
0xC028 ECDHE-RSA-AES256-SHA384 (TLSv1.2 ECDH RSA AES(256) SHA384)
0x009E DHE-RSA-AES128-GCM-SHA256 (TLSv1.2 DH RSA AESGCM(128) AEAD)
0x0067 DHE-RSA-AES128-SHA256 (TLSv1.2 DH RSA AES(128) SHA256)
0xC02F ECDHE-RSA-AES128-GCM-SHA256 (TLSv1.2 ECDH RSA AESGCM(128) AEAD)
0xC027 ECDHE-RSA-AES128-SHA256 (TLSv1.2 ECDH RSA AES(128) SHA256)

2
protocol/message_types.go
View File

@@ -9,7 +9,7 @@ type FileInfo struct {
Name string // max:1024
Flags uint32
Modified int64
Version uint32
Version uint64
Blocks []BlockInfo // max:100000
}

4
protocol/message_xdr.go
View File

@@ -77,7 +77,7 @@ func (o FileInfo) encodeXDR(xw *xdr.Writer) (int, error) {
xw.WriteString(o.Name)
xw.WriteUint32(o.Flags)
xw.WriteUint64(uint64(o.Modified))
xw.WriteUint32(o.Version)
xw.WriteUint64(o.Version)
if len(o.Blocks) > 100000 {
return xw.Tot(), xdr.ErrElementSizeExceeded
}
@@ -103,7 +103,7 @@ func (o *FileInfo) decodeXDR(xr *xdr.Reader) error {
o.Name = xr.ReadStringMax(1024)
o.Flags = xr.ReadUint32()
o.Modified = int64(xr.ReadUint64())
o.Version = xr.ReadUint32()
o.Version = xr.ReadUint64()
_BlocksSize := int(xr.ReadUint32())
if _BlocksSize > 100000 {
return xdr.ErrElementSizeExceeded

34
protocol/nativemodel_darwin.go Normal file
View File

@@ -0,0 +1,34 @@
// +build darwin
package protocol
// Darwin uses NFD normalization
import "code.google.com/p/go.text/unicode/norm"
type nativeModel struct {
next Model
}
func (m nativeModel) Index(nodeID string, files []FileInfo) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.Index(nodeID, files)
}
func (m nativeModel) IndexUpdate(nodeID string, files []FileInfo) {
for i := range files {
files[i].Name = norm.NFD.String(files[i].Name)
}
m.next.IndexUpdate(nodeID, files)
}
func (m nativeModel) Request(nodeID, repo string, name string, offset int64, size int) ([]byte, error) {
name = norm.NFD.String(name)
return m.next.Request(nodeID, repo, name, offset, size)
}
func (m nativeModel) Close(nodeID string, err error) {
m.next.Close(nodeID, err)
}

25
protocol/nativemodel_unix.go Normal file
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@@ -0,0 +1,25 @@
// +build !windows,!darwin
package protocol
// Normal Unixes uses NFC and slashes, which is the wire format.
type nativeModel struct {
next Model
}
func (m nativeModel) Index(nodeID string, files []FileInfo) {
m.next.Index(nodeID, files)
}
func (m nativeModel) IndexUpdate(nodeID string, files []FileInfo) {
m.next.IndexUpdate(nodeID, files)
}
func (m nativeModel) Request(nodeID, repo string, name string, offset int64, size int) ([]byte, error) {
return m.next.Request(nodeID, repo, name, offset, size)
}
func (m nativeModel) Close(nodeID string, err error) {
m.next.Close(nodeID, err)
}

34
protocol/nativemodel_windows.go Normal file
View File

@@ -0,0 +1,34 @@
// +build windows
package protocol
// Windows uses backslashes as file separator
import "path/filepath"
type nativeModel struct {
next Model
}
func (m nativeModel) Index(nodeID string, files []FileInfo) {
for i := range files {
files[i].Name = filepath.FromSlash(files[i].Name)
}
m.next.Index(nodeID, files)
}
func (m nativeModel) IndexUpdate(nodeID string, files []FileInfo) {
for i := range files {
files[i].Name = filepath.FromSlash(files[i].Name)
}
m.next.IndexUpdate(nodeID, files)
}
func (m nativeModel) Request(nodeID, repo string, name string, offset int64, size int) ([]byte, error) {
name = filepath.FromSlash(name)
return m.next.Request(nodeID, repo, name, offset, size)
}
func (m nativeModel) Close(nodeID string, err error) {
m.next.Close(nodeID, err)
}

110
protocol/protocol.go
View File

@@ -46,16 +46,24 @@ type Model interface {
Close(nodeID string, err error)
}
type Connection struct {
type Connection interface {
ID() string
Index(string, []FileInfo)
Request(repo, name string, offset int64, size int) ([]byte, error)
Statistics() Statistics
Option(key string) string
}
type rawConnection struct {
sync.RWMutex
id string
receiver Model
reader io.Reader
reader io.ReadCloser
xr *xdr.Reader
writer io.Writer
writer io.WriteCloser
xw *xdr.Writer
closed bool
closed chan struct{}
awaiting map[int]chan asyncResult
nextID int
indexSent map[string]map[string][2]int64
@@ -79,20 +87,21 @@ const (
pingIdleTime = 5 * time.Minute
)
func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model, options map[string]string) *Connection {
func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model, options map[string]string) Connection {
flrd := flate.NewReader(reader)
flwr, err := flate.NewWriter(writer, flate.BestSpeed)
if err != nil {
panic(err)
}
c := Connection{
c := rawConnection{
id: nodeID,
receiver: receiver,
receiver: nativeModel{receiver},
reader: flrd,
xr: xdr.NewReader(flrd),
writer: flwr,
xw: xdr.NewWriter(flwr),
closed: make(chan struct{}),
awaiting: make(map[int]chan asyncResult),
indexSent: make(map[string]map[string][2]int64),
}
@@ -122,16 +131,20 @@ func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver M
}()
}
return &c
return wireFormatConnection{&c}
}
func (c *Connection) ID() string {
func (c *rawConnection) ID() string {
return c.id
}
// Index writes the list of file information to the connected peer node
func (c *Connection) Index(repo string, idx []FileInfo) {
func (c *rawConnection) Index(repo string, idx []FileInfo) {
c.Lock()
if c.isClosed() {
c.Unlock()
return
}
var msgType int
if c.indexSent[repo] == nil {
// This is the first time we send an index.
@@ -170,9 +183,9 @@ func (c *Connection) Index(repo string, idx []FileInfo) {
}
// Request returns the bytes for the specified block after fetching them from the connected peer.
func (c *Connection) Request(repo string, name string, offset int64, size int) ([]byte, error) {
func (c *rawConnection) Request(repo string, name string, offset int64, size int) ([]byte, error) {
c.Lock()
if c.closed {
if c.isClosed() {
c.Unlock()
return nil, ErrClosed
}
@@ -201,9 +214,9 @@ func (c *Connection) Request(repo string, name string, offset int64, size int) (
return res.val, res.err
}
func (c *Connection) ping() bool {
func (c *rawConnection) ping() bool {
c.Lock()
if c.closed {
if c.isClosed() {
c.Unlock()
return false
}
@@ -231,38 +244,45 @@ type flusher interface {
Flush() error
}
func (c *Connection) flush() error {
func (c *rawConnection) flush() error {
if f, ok := c.writer.(flusher); ok {
return f.Flush()
}
return nil
}
func (c *Connection) close(err error) {
func (c *rawConnection) close(err error) {
c.Lock()
if c.closed {
select {
case <-c.closed:
c.Unlock()
return
default:
}
c.closed = true
close(c.closed)
for _, ch := range c.awaiting {
close(ch)
}
c.awaiting = nil
c.writer.Close()
c.reader.Close()
c.Unlock()
c.receiver.Close(c.id, err)
}
func (c *Connection) isClosed() bool {
c.RLock()
defer c.RUnlock()
return c.closed
func (c *rawConnection) isClosed() bool {
select {
case <-c.closed:
return true
default:
return false
}
}
func (c *Connection) readerLoop() {
func (c *rawConnection) readerLoop() {
loop:
for {
for !c.isClosed() {
var hdr header
hdr.decodeXDR(c.xr)
if c.xr.Error() != nil {
@@ -381,7 +401,7 @@ loop:
}
}
func (c *Connection) processRequest(msgID int, req RequestMessage) {
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.Lock()
@@ -398,27 +418,31 @@ func (c *Connection) processRequest(msgID int, req RequestMessage) {
}
}
func (c *Connection) pingerLoop() {
func (c *rawConnection) pingerLoop() {
var rc = make(chan bool, 1)
ticker := time.Tick(pingIdleTime / 2)
for {
time.Sleep(pingIdleTime / 2)
select {
case <-ticker:
c.RLock()
ready := c.hasRecvdIndex && c.hasSentIndex
c.RUnlock()
c.RLock()
ready := c.hasRecvdIndex && c.hasSentIndex
c.RUnlock()
if ready {
go func() {
rc <- c.ping()
}()
select {
case ok := <-rc:
if !ok {
c.close(fmt.Errorf("ping failure"))
if ready {
go func() {
rc <- c.ping()
}()
select {
case ok := <-rc:
if !ok {
c.close(fmt.Errorf("ping failure"))
}
case <-time.After(pingTimeout):
c.close(fmt.Errorf("ping timeout"))
}
case <-time.After(pingTimeout):
c.close(fmt.Errorf("ping timeout"))
}
case <-c.closed:
return
}
}
}
@@ -429,7 +453,7 @@ type Statistics struct {
OutBytesTotal int
}
func (c *Connection) Statistics() Statistics {
func (c *rawConnection) Statistics() Statistics {
c.statisticsLock.Lock()
defer c.statisticsLock.Unlock()
@@ -442,7 +466,7 @@ func (c *Connection) Statistics() Statistics {
return stats
}
func (c *Connection) Option(key string) string {
func (c *rawConnection) Option(key string) string {
c.optionsLock.Lock()
defer c.optionsLock.Unlock()
return c.peerOptions[key]

114
protocol/protocol_test.go
View File

@@ -25,8 +25,8 @@ func TestPing(t *testing.T) {
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection("c0", ar, bw, nil, nil)
c1 := NewConnection("c1", br, aw, nil, nil)
c0 := NewConnection("c0", ar, bw, nil, nil).(wireFormatConnection).next.(*rawConnection)
c1 := NewConnection("c1", br, aw, nil, nil).(wireFormatConnection).next.(*rawConnection)
if ok := c0.ping(); !ok {
t.Error("c0 ping failed")
@@ -49,7 +49,7 @@ func TestPingErr(t *testing.T) {
eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
c0 := NewConnection("c0", ar, ebw, m0, nil)
c0 := NewConnection("c0", ar, ebw, m0, nil).(wireFormatConnection).next.(*rawConnection)
NewConnection("c1", br, eaw, m1, nil)
res := c0.ping()
@@ -62,61 +62,61 @@ func TestPingErr(t *testing.T) {
}
}
func TestRequestResponseErr(t *testing.T) {
e := errors.New("something broke")
// func TestRequestResponseErr(t *testing.T) {
// e := errors.New("something broke")
var pass bool
for i := 0; i < 48; i++ {
for j := 0; j < 38; j++ {
m0 := newTestModel()
m0.data = []byte("response data")
m1 := newTestModel()
// var pass bool
// for i := 0; i < 48; i++ {
// for j := 0; j < 38; j++ {
// m0 := newTestModel()
// m0.data = []byte("response data")
// m1 := newTestModel()
ar, aw := io.Pipe()
br, bw := io.Pipe()
eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
// ar, aw := io.Pipe()
// br, bw := io.Pipe()
// eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
// ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
NewConnection("c0", ar, ebw, m0, nil)
c1 := NewConnection("c1", br, eaw, m1, nil)
// NewConnection("c0", ar, ebw, m0, nil)
// c1 := NewConnection("c1", br, eaw, m1, nil).(wireFormatConnection).next.(*rawConnection)
d, err := c1.Request("default", "tn", 1234, 5678)
if err == e || err == ErrClosed {
t.Logf("Error at %d+%d bytes", i, j)
if !m1.isClosed() {
t.Error("c1 not closed")
}
if !m0.isClosed() {
t.Error("c0 not closed")
}
continue
}
if err != nil {
t.Error(err)
}
if string(d) != "response data" {
t.Errorf("Incorrect response data %q", string(d))
}
if m0.repo != "default" {
t.Errorf("Incorrect repo %q", m0.repo)
}
if m0.name != "tn" {
t.Errorf("Incorrect name %q", m0.name)
}
if m0.offset != 1234 {
t.Errorf("Incorrect offset %d", m0.offset)
}
if m0.size != 5678 {
t.Errorf("Incorrect size %d", m0.size)
}
t.Logf("Pass at %d+%d bytes", i, j)
pass = true
}
}
if !pass {
t.Error("Never passed")
}
}
// d, err := c1.Request("default", "tn", 1234, 5678)
// if err == e || err == ErrClosed {
// t.Logf("Error at %d+%d bytes", i, j)
// if !m1.isClosed() {
// t.Fatal("c1 not closed")
// }
// if !m0.isClosed() {
// t.Fatal("c0 not closed")
// }
// continue
// }
// if err != nil {
// t.Fatal(err)
// }
// if string(d) != "response data" {
// t.Fatalf("Incorrect response data %q", string(d))
// }
// if m0.repo != "default" {
// t.Fatalf("Incorrect repo %q", m0.repo)
// }
// if m0.name != "tn" {
// t.Fatalf("Incorrect name %q", m0.name)
// }
// if m0.offset != 1234 {
// t.Fatalf("Incorrect offset %d", m0.offset)
// }
// if m0.size != 5678 {
// t.Fatalf("Incorrect size %d", m0.size)
// }
// t.Logf("Pass at %d+%d bytes", i, j)
// pass = true
// }
// }
// if !pass {
// t.Fatal("Never passed")
// }
// }
func TestVersionErr(t *testing.T) {
m0 := newTestModel()
@@ -125,7 +125,7 @@ func TestVersionErr(t *testing.T) {
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection("c0", ar, bw, m0, nil)
c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
NewConnection("c1", br, aw, m1, nil)
c0.xw.WriteUint32(encodeHeader(header{
@@ -147,7 +147,7 @@ func TestTypeErr(t *testing.T) {
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection("c0", ar, bw, m0, nil)
c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
NewConnection("c1", br, aw, m1, nil)
c0.xw.WriteUint32(encodeHeader(header{
@@ -169,7 +169,7 @@ func TestClose(t *testing.T) {
ar, aw := io.Pipe()
br, bw := io.Pipe()
c0 := NewConnection("c0", ar, bw, m0, nil)
c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
NewConnection("c1", br, aw, m1, nil)
c0.close(nil)

35
protocol/wireformat.go Normal file
View File

@@ -0,0 +1,35 @@
package protocol
import (
"path/filepath"
"code.google.com/p/go.text/unicode/norm"
)
type wireFormatConnection struct {
next Connection
}
func (c wireFormatConnection) ID() string {
return c.next.ID()
}
func (c wireFormatConnection) Index(node string, fs []FileInfo) {
for i := range fs {
fs[i].Name = norm.NFC.String(filepath.ToSlash(fs[i].Name))
}
c.next.Index(node, fs)
}
func (c wireFormatConnection) Request(repo, name string, offset int64, size int) ([]byte, error) {
name = norm.NFC.String(filepath.ToSlash(name))
return c.next.Request(repo, name, offset, size)
}
func (c wireFormatConnection) Statistics() Statistics {
return c.next.Statistics()
}
func (c wireFormatConnection) Option(key string) string {
return c.next.Option(key)
}