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Godep: add cmux dependency

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This commit is contained in:
Xiang Li 2016-03-21 14:33:37 -07:00
parent d3809abe42
commit 7c3432a79f
10 changed files with 886 additions and 1 deletions
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Godeps/Godeps.json generated
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@ -31,6 +31,10 @@
"ImportPath": "github.com/cheggaaa/pb", "ImportPath": "github.com/cheggaaa/pb",
"Rev": "da1f27ad1d9509b16f65f52fd9d8138b0f2dc7b2" "Rev": "da1f27ad1d9509b16f65f52fd9d8138b0f2dc7b2"
}, },
{
"ImportPath": "github.com/cockroachdb/cmux",
"Rev": "112f0506e7743d64a6eb8fedbcff13d9979bbf92"
},
{ {
"ImportPath": "github.com/codegangsta/cli", "ImportPath": "github.com/codegangsta/cli",
"Comment": "1.2.0-183-gb5232bb", "Comment": "1.2.0-183-gb5232bb",

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Godeps/_workspace/src/github.com/cockroachdb/cmux/.gitignore generated vendored Normal file
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof

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Godeps/_workspace/src/github.com/cockroachdb/cmux/.travis.yml generated vendored Normal file
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language: go
go:
- 1.3
- 1.4
- 1.5
- 1.6
gobuild_args: -race
before_install:
- go get -u github.com/golang/lint/golint
- if [[ $TRAVIS_GO_VERSION == 1.5* ]]; then go get -u github.com/kisielk/errcheck; fi
- go get -u golang.org/x/tools/cmd/vet
before_script:
- '! gofmt -s -l . | read'
- golint ./...
- echo $TRAVIS_GO_VERSION
- if [[ $TRAVIS_GO_VERSION == 1.5* ]]; then errcheck ./...; fi
- go vet .
- go tool vet --shadow .

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Godeps/_workspace/src/github.com/cockroachdb/cmux/LICENSE generated vendored Normal file
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Godeps/_workspace/src/github.com/cockroachdb/cmux/README.md generated vendored Normal file
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# cmux: Connection Mux [![Build Status](https://travis-ci.org/cockroachdb/cmux.svg?branch=master)](https://travis-ci.org/cockroachdb/cmux) [![GoDoc](https://godoc.org/github.com/cockroachdb/cmux?status.svg)](https://godoc.org/github.com/cockroachdb/cmux)
cmux is a generic Go library to multiplex connections based on their payload.
Using cmux, you can serve gRPC, SSH, HTTPS, HTTP, Go RPC, and pretty much any
other protocol on the same TCP listener.
## How-To
Simply create your main listener, create a cmux for that listener,
and then match connections:
```go
// Create the main listener.
l, err := net.Listen("tcp", ":23456")
if err != nil {
log.Fatal(err)
}
// Create a cmux.
m := cmux.New(l)
// Match connections in order:
// First grpc, then HTTP, and otherwise Go RPC/TCP.
grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
httpL := m.Match(cmux.HTTP1Fast())
trpcL := m.Match(cmux.Any()) // Any means anything that is not yet matched.
// Create your protocol servers.
grpcS := grpc.NewServer()
grpchello.RegisterGreeterServer(grpcs, &server{})
httpS := &http.Server{
Handler: &helloHTTP1Handler{},
}
trpcS := rpc.NewServer()
s.Register(&ExampleRPCRcvr{})
// Use the muxed listeners for your servers.
go grpcS.Serve(grpcL)
go httpS.Serve(httpL)
go trpcS.Accept(trpcL)
// Start serving!
m.Serve()
```
There are [more examples on GoDoc](https://godoc.org/github.com/cockroachdb/cmux#pkg-examples).
## Performance
Since we are only matching the very first bytes of a connection, the
performance overhead on long-lived connections (i.e., RPCs and pipelined HTTP
streams) is negligible.
## Limitations
* *TLS*: `net/http` uses a [type assertion](https://github.com/golang/go/issues/14221)
to identify TLS connections; since cmux's lookahead-implementing connection
wraps the underlying TLS connection, this type assertion fails. This means you
can serve HTTPS using cmux but `http.Request.TLS` will not be set in your
handlers. If you are able to wrap TLS around cmux, you can work around this
limitation. See https://github.com/cockroachdb/cockroach/commit/83caba2 for an
example of this approach.
* *Different Protocols on The Same Connection*: `cmux` matches the connection
when it's accepted. For example, one connection can be either gRPC or REST, but
not both. That is, we assume that a client connection is either used for gRPC
or REST.

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Godeps/_workspace/src/github.com/cockroachdb/cmux/buffer.go generated vendored Normal file
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package cmux
import (
"bytes"
"io"
)
// bufferedReader is an optimized implementation of io.Reader that behaves like
// ```
// io.MultiReader(bytes.NewReader(buffer.Bytes()), io.TeeReader(source, buffer))
// ```
// without allocating.
type bufferedReader struct {
source io.Reader
buffer *bytes.Buffer
bufferRead int
bufferSize int
}
func (s *bufferedReader) Read(p []byte) (int, error) {
// Functionality of bytes.Reader.
bn := copy(p, s.buffer.Bytes()[s.bufferRead:s.bufferSize])
s.bufferRead += bn
p = p[bn:]
// Funtionality of io.TeeReader.
sn, sErr := s.source.Read(p)
if sn > 0 {
if wn, wErr := s.buffer.Write(p[:sn]); wErr != nil {
return bn + wn, wErr
}
}
return bn + sn, sErr
}

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Godeps/_workspace/src/github.com/cockroachdb/cmux/cmux.go generated vendored Normal file
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package cmux
import (
"bytes"
"fmt"
"io"
"net"
"sync"
)
// Matcher matches a connection based on its content.
type Matcher func(io.Reader) bool
// ErrorHandler handles an error and returns whether
// the mux should continue serving the listener.
type ErrorHandler func(error) bool
var _ net.Error = ErrNotMatched{}
// ErrNotMatched is returned whenever a connection is not matched by any of
// the matchers registered in the multiplexer.
type ErrNotMatched struct {
c net.Conn
}
func (e ErrNotMatched) Error() string {
return fmt.Sprintf("mux: connection %v not matched by an matcher",
e.c.RemoteAddr())
}
// Temporary implements the net.Error interface.
func (e ErrNotMatched) Temporary() bool { return true }
// Timeout implements the net.Error interface.
func (e ErrNotMatched) Timeout() bool { return false }
type errListenerClosed string
func (e errListenerClosed) Error() string { return string(e) }
func (e errListenerClosed) Temporary() bool { return false }
func (e errListenerClosed) Timeout() bool { return false }
// ErrListenerClosed is returned from muxListener.Accept when the underlying
// listener is closed.
var ErrListenerClosed = errListenerClosed("mux: listener closed")
// New instantiates a new connection multiplexer.
func New(l net.Listener) CMux {
return &cMux{
root: l,
bufLen: 1024,
errh: func(_ error) bool { return true },
donec: make(chan struct{}),
}
}
// CMux is a multiplexer for network connections.
type CMux interface {
// Match returns a net.Listener that sees (i.e., accepts) only
// the connections matched by at least one of the matcher.
//
// The order used to call Match determines the priority of matchers.
Match(...Matcher) net.Listener
// Serve starts multiplexing the listener. Serve blocks and perhaps
// should be invoked concurrently within a go routine.
Serve() error
// HandleError registers an error handler that handles listener errors.
HandleError(ErrorHandler)
}
type matchersListener struct {
ss []Matcher
l muxListener
}
type cMux struct {
root net.Listener
bufLen int
errh ErrorHandler
donec chan struct{}
sls []matchersListener
}
func (m *cMux) Match(matchers ...Matcher) net.Listener {
ml := muxListener{
Listener: m.root,
connc: make(chan net.Conn, m.bufLen),
}
m.sls = append(m.sls, matchersListener{ss: matchers, l: ml})
return ml
}
func (m *cMux) Serve() error {
var wg sync.WaitGroup
defer func() {
close(m.donec)
wg.Wait()
for _, sl := range m.sls {
close(sl.l.connc)
// Drain the connections enqueued for the listener.
for c := range sl.l.connc {
_ = c.Close()
}
}
}()
for {
c, err := m.root.Accept()
if err != nil {
if !m.handleErr(err) {
return err
}
continue
}
wg.Add(1)
go m.serve(c, m.donec, &wg)
}
}
func (m *cMux) serve(c net.Conn, donec <-chan struct{}, wg *sync.WaitGroup) {
defer wg.Done()
muc := newMuxConn(c)
for _, sl := range m.sls {
for _, s := range sl.ss {
matched := s(muc.getSniffer())
if matched {
select {
case sl.l.connc <- muc:
case <-donec:
_ = c.Close()
}
return
}
}
}
_ = c.Close()
err := ErrNotMatched{c: c}
if !m.handleErr(err) {
_ = m.root.Close()
}
}
func (m *cMux) HandleError(h ErrorHandler) {
m.errh = h
}
func (m *cMux) handleErr(err error) bool {
if !m.errh(err) {
return false
}
if ne, ok := err.(net.Error); ok {
return ne.Temporary()
}
return false
}
type muxListener struct {
net.Listener
connc chan net.Conn
}
func (l muxListener) Accept() (net.Conn, error) {
c, ok := <-l.connc
if !ok {
return nil, ErrListenerClosed
}
return c, nil
}
// MuxConn wraps a net.Conn and provides transparent sniffing of connection data.
type MuxConn struct {
net.Conn
buf bytes.Buffer
sniffer bufferedReader
}
func newMuxConn(c net.Conn) *MuxConn {
return &MuxConn{
Conn: c,
}
}
// From the io.Reader documentation:
//
// When Read encounters an error or end-of-file condition after
// successfully reading n > 0 bytes, it returns the number of
// bytes read. It may return the (non-nil) error from the same call
// or return the error (and n == 0) from a subsequent call.
// An instance of this general case is that a Reader returning
// a non-zero number of bytes at the end of the input stream may
// return either err == EOF or err == nil. The next Read should
// return 0, EOF.
func (m *MuxConn) Read(p []byte) (int, error) {
if n, err := m.buf.Read(p); err != io.EOF {
return n, err
}
return m.Conn.Read(p)
}
func (m *MuxConn) getSniffer() io.Reader {
m.sniffer = bufferedReader{source: m.Conn, buffer: &m.buf, bufferSize: m.buf.Len()}
return &m.sniffer
}

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package cmux
import (
"bufio"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/http2"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/http2/hpack"
)
// Any is a Matcher that matches any connection.
func Any() Matcher {
return func(r io.Reader) bool { return true }
}
// PrefixMatcher returns a matcher that matches a connection if it
// starts with any of the strings in strs.
func PrefixMatcher(strs ...string) Matcher {
pt := newPatriciaTreeString(strs...)
return pt.matchPrefix
}
var defaultHTTPMethods = []string{
"OPTIONS",
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"TRACE",
"CONNECT",
}
// HTTP1Fast only matches the methods in the HTTP request.
//
// This matcher is very optimistic: if it returns true, it does not mean that
// the request is a valid HTTP response. If you want a correct but slower HTTP1
// matcher, use HTTP1 instead.
func HTTP1Fast(extMethods ...string) Matcher {
return PrefixMatcher(append(defaultHTTPMethods, extMethods...)...)
}
const maxHTTPRead = 4096
// HTTP1 parses the first line or upto 4096 bytes of the request to see if
// the conection contains an HTTP request.
func HTTP1() Matcher {
return func(r io.Reader) bool {
br := bufio.NewReader(&io.LimitedReader{R: r, N: maxHTTPRead})
l, part, err := br.ReadLine()
if err != nil || part {
return false
}
_, _, proto, ok := parseRequestLine(string(l))
if !ok {
return false
}
v, _, ok := http.ParseHTTPVersion(proto)
return ok && v == 1
}
}
// grabbed from net/http.
func parseRequestLine(line string) (method, uri, proto string, ok bool) {
s1 := strings.Index(line, " ")
s2 := strings.Index(line[s1+1:], " ")
if s1 < 0 || s2 < 0 {
return
}
s2 += s1 + 1
return line[:s1], line[s1+1 : s2], line[s2+1:], true
}
// HTTP2 parses the frame header of the first frame to detect whether the
// connection is an HTTP2 connection.
func HTTP2() Matcher {
return hasHTTP2Preface
}
// HTTP1HeaderField returns a matcher matching the header fields of the first
// request of an HTTP 1 connection.
func HTTP1HeaderField(name, value string) Matcher {
return func(r io.Reader) bool {
return matchHTTP1Field(r, name, value)
}
}
// HTTP2HeaderField resturns a matcher matching the header fields of the first
// headers frame.
func HTTP2HeaderField(name, value string) Matcher {
return func(r io.Reader) bool {
return matchHTTP2Field(r, name, value)
}
}
func hasHTTP2Preface(r io.Reader) bool {
var b [len(http2.ClientPreface)]byte
if _, err := io.ReadFull(r, b[:]); err != nil {
return false
}
return string(b[:]) == http2.ClientPreface
}
func matchHTTP1Field(r io.Reader, name, value string) (matched bool) {
req, err := http.ReadRequest(bufio.NewReader(r))
if err != nil {
return false
}
return req.Header.Get(name) == value
}
func matchHTTP2Field(r io.Reader, name, value string) (matched bool) {
if !hasHTTP2Preface(r) {
return false
}
framer := http2.NewFramer(ioutil.Discard, r)
hdec := hpack.NewDecoder(uint32(4<<10), func(hf hpack.HeaderField) {
if hf.Name == name && hf.Value == value {
matched = true
}
})
for {
f, err := framer.ReadFrame()
if err != nil {
return false
}
switch f := f.(type) {
case *http2.HeadersFrame:
if _, err := hdec.Write(f.HeaderBlockFragment()); err != nil {
return false
}
if matched {
return true
}
if f.FrameHeader.Flags&http2.FlagHeadersEndHeaders != 0 {
return false
}
}
}
}

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package cmux
import (
"bytes"
"io"
)
// patriciaTree is a simple patricia tree that handles []byte instead of string
// and cannot be changed after instantiation.
type patriciaTree struct {
root *ptNode
}
func newPatriciaTree(b ...[]byte) *patriciaTree {
return &patriciaTree{
root: newNode(b),
}
}
func newPatriciaTreeString(strs ...string) *patriciaTree {
b := make([][]byte, len(strs))
for i, s := range strs {
b[i] = []byte(s)
}
return &patriciaTree{
root: newNode(b),
}
}
func (t *patriciaTree) matchPrefix(r io.Reader) bool {
return t.root.match(r, true)
}
func (t *patriciaTree) match(r io.Reader) bool {
return t.root.match(r, false)
}
type ptNode struct {
prefix []byte
next map[byte]*ptNode
terminal bool
}
func newNode(strs [][]byte) *ptNode {
if len(strs) == 0 {
return &ptNode{
prefix: []byte{},
terminal: true,
}
}
if len(strs) == 1 {
return &ptNode{
prefix: strs[0],
terminal: true,
}
}
p, strs := splitPrefix(strs)
n := &ptNode{
prefix: p,
}
nexts := make(map[byte][][]byte)
for _, s := range strs {
if len(s) == 0 {
n.terminal = true
continue
}
nexts[s[0]] = append(nexts[s[0]], s[1:])
}
n.next = make(map[byte]*ptNode)
for first, rests := range nexts {
n.next[first] = newNode(rests)
}
return n
}
func splitPrefix(bss [][]byte) (prefix []byte, rest [][]byte) {
if len(bss) == 0 || len(bss[0]) == 0 {
return prefix, bss
}
if len(bss) == 1 {
return bss[0], [][]byte{{}}
}
for i := 0; ; i++ {
var cur byte
eq := true
for j, b := range bss {
if len(b) <= i {
eq = false
break
}
if j == 0 {
cur = b[i]
continue
}
if cur != b[i] {
eq = false
break
}
}
if !eq {
break
}
prefix = append(prefix, cur)
}
rest = make([][]byte, 0, len(bss))
for _, b := range bss {
rest = append(rest, b[len(prefix):])
}
return prefix, rest
}
func readBytes(r io.Reader, n int) (b []byte, err error) {
b = make([]byte, n)
o := 0
for o < n {
nr, err := r.Read(b[o:])
if err != nil && err != io.EOF {
return b, err
}
o += nr
if err == io.EOF {
break
}
}
return b[:o], nil
}
func (n *ptNode) match(r io.Reader, prefix bool) bool {
if l := len(n.prefix); l > 0 {
b, err := readBytes(r, l)
if err != nil || len(b) != l || !bytes.Equal(b, n.prefix) {
return false
}
}
if prefix && n.terminal {
return true
}
b := make([]byte, 1)
for {
nr, err := r.Read(b)
if nr != 0 {
break
}
if err == io.EOF {
return n.terminal
}
if err != nil {
return false
}
}
nextN, ok := n.next[b[0]]
return ok && nextN.match(r, prefix)
}

2
etcdmain/serve.go
View File

@ -21,7 +21,7 @@ import (
"net/http" "net/http"
"time" "time"
"github.com/cockroachdb/cmux" "github.com/coreos/etcd/Godeps/_workspace/src/github.com/cockroachdb/cmux"
"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc" "github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
) )