Godep: add cmux dependency

Godeps/Godeps.json

@@ -31,6 +31,10 @@
 			"ImportPath": "github.com/cheggaaa/pb",
 			"Rev": "da1f27ad1d9509b16f65f52fd9d8138b0f2dc7b2"
 		},
+		{
+			"ImportPath": "github.com/cockroachdb/cmux",
+			"Rev": "112f0506e7743d64a6eb8fedbcff13d9979bbf92"
+		},
 		{
 			"ImportPath": "github.com/codegangsta/cli",
 			"Comment": "1.2.0-183-gb5232bb",

Godeps/_workspace/src/github.com/cockroachdb/cmux/.gitignore

@@ -0,0 +1,24 @@
+# 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

Godeps/_workspace/src/github.com/cockroachdb/cmux/.travis.yml

@@ -0,0 +1,22 @@
+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 .

Godeps/_workspace/src/github.com/cockroachdb/cmux/LICENSE

@@ -0,0 +1,202 @@
+
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Godeps/_workspace/src/github.com/cockroachdb/cmux/README.md

@@ -0,0 +1,65 @@
+# 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.

Godeps/_workspace/src/github.com/cockroachdb/cmux/buffer.go

@@ -0,0 +1,35 @@
+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
+}

Godeps/_workspace/src/github.com/cockroachdb/cmux/cmux.go

@@ -0,0 +1,210 @@
+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
+}

Godeps/_workspace/src/github.com/cockroachdb/cmux/matchers.go

@@ -0,0 +1,150 @@
+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
+			}
+		}
+	}
+}

Godeps/_workspace/src/github.com/cockroachdb/cmux/patricia.go

@@ -0,0 +1,173 @@
+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)
+}

etcdmain/serve.go

@@ -21,7 +21,7 @@ import (
 	"net/http"
 	"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"
 )