diff options
Diffstat (limited to 'vendor')
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/LICENSE | 202 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/README.md | 83 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/buffer.go | 67 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/cmux.go | 269 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/doc.go | 18 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/matchers.go | 262 | ||||
| -rw-r--r-- | vendor/github.com/soheilhy/cmux/patricia.go | 179 |
7 files changed, 0 insertions, 1080 deletions
diff --git a/vendor/github.com/soheilhy/cmux/LICENSE b/vendor/github.com/soheilhy/cmux/LICENSE deleted file mode 100644 index d64569567..000000000 --- a/vendor/github.com/soheilhy/cmux/LICENSE +++ /dev/null @@ -1,202 +0,0 @@ - - Apache License - Version 2.0, January 2004 - http://www.apache.org/licenses/ - - TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION - - 1. Definitions. - - "License" shall mean the terms and conditions for use, reproduction, - and distribution as defined by Sections 1 through 9 of this document. - - "Licensor" shall mean the copyright owner or entity authorized by - the copyright owner that is granting the License. - - "Legal Entity" shall mean the union of the acting entity and all - other entities that control, are controlled by, or are under common - control with that entity. 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We also recommend that a - file or class name and description of purpose be included on the - same "printed page" as the copyright notice for easier - identification within third-party archives. - - Copyright [yyyy] [name of copyright owner] - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. diff --git a/vendor/github.com/soheilhy/cmux/README.md b/vendor/github.com/soheilhy/cmux/README.md deleted file mode 100644 index 70306e6ab..000000000 --- a/vendor/github.com/soheilhy/cmux/README.md +++ /dev/null @@ -1,83 +0,0 @@ -# cmux: Connection Mux  [](http://godoc.org/github.com/soheilhy/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() -trpcS.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() -``` - -Take a look at [other examples in the GoDoc](http://godoc.org/github.com/soheilhy/cmux/#pkg-examples). - -## Docs -* [GoDocs](https://godoc.org/github.com/soheilhy/cmux) - -## Performance -There is room for improvment but, since we are only matching -the very first bytes of a connection, the performance overheads on -long-lived connections (i.e., RPCs and pipelined HTTP streams) -is negligible. - -*TODO(soheil)*: Add benchmarks. - -## Limitations -* *TLS*: `net/http` uses a type assertion to identify TLS connections; since -cmux's lookahead-implementing connection wraps the underlying TLS connection, -this type assertion fails. -Because of that, you can serve HTTPS using cmux but `http.Request.TLS` -would not be set in your handlers. - -* *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. - -* *Java gRPC Clients*: Java gRPC client blocks until it receives a SETTINGS -frame from the server. If you are using the Java client to connect to a cmux'ed -gRPC server please match with writers: -```go -grpcl := m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc")) -``` - -# Copyright and License -Copyright 2016 The CMux Authors. All rights reserved. - -See [CONTRIBUTORS](https://github.com/soheilhy/cmux/blob/master/CONTRIBUTORS) -for the CMux Authors. Code is released under -[the Apache 2 license](https://github.com/soheilhy/cmux/blob/master/LICENSE). diff --git a/vendor/github.com/soheilhy/cmux/buffer.go b/vendor/github.com/soheilhy/cmux/buffer.go deleted file mode 100644 index f8cf30a1e..000000000 --- a/vendor/github.com/soheilhy/cmux/buffer.go +++ /dev/null @@ -1,67 +0,0 @@ -// Copyright 2016 The CMux Authors. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -// implied. See the License for the specific language governing -// permissions and limitations under the License. - -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 - sniffing bool - lastErr error -} - -func (s *bufferedReader) Read(p []byte) (int, error) { - if s.bufferSize > s.bufferRead { - // If we have already read something from the buffer before, we return the - // same data and the last error if any. We need to immediately return, - // otherwise we may block for ever, if we try to be smart and call - // source.Read() seeking a little bit of more data. - bn := copy(p, s.buffer.Bytes()[s.bufferRead:s.bufferSize]) - s.bufferRead += bn - return bn, s.lastErr - } else if !s.sniffing && s.buffer.Cap() != 0 { - // We don't need the buffer anymore. - // Reset it to release the internal slice. - s.buffer = bytes.Buffer{} - } - - // If there is nothing more to return in the sniffed buffer, read from the - // source. - sn, sErr := s.source.Read(p) - if sn > 0 && s.sniffing { - s.lastErr = sErr - if wn, wErr := s.buffer.Write(p[:sn]); wErr != nil { - return wn, wErr - } - } - return sn, sErr -} - -func (s *bufferedReader) reset(snif bool) { - s.sniffing = snif - s.bufferRead = 0 - s.bufferSize = s.buffer.Len() -} diff --git a/vendor/github.com/soheilhy/cmux/cmux.go b/vendor/github.com/soheilhy/cmux/cmux.go deleted file mode 100644 index 9de6b0a3c..000000000 --- a/vendor/github.com/soheilhy/cmux/cmux.go +++ /dev/null @@ -1,269 +0,0 @@ -// Copyright 2016 The CMux Authors. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -// implied. See the License for the specific language governing -// permissions and limitations under the License. - -package cmux - -import ( - "fmt" - "io" - "net" - "sync" - "time" -) - -// Matcher matches a connection based on its content. -type Matcher func(io.Reader) bool - -// MatchWriter is a match that can also write response (say to do handshake). -type MatchWriter func(io.Writer, 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") - -// for readability of readTimeout -var noTimeout time.Duration - -// 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{}), - readTimeout: noTimeout, - } -} - -// 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 - // MatchWithWriters returns a net.Listener that accepts only the - // connections that matched by at least of the matcher writers. - // - // Prefer Matchers over MatchWriters, since the latter can write on the - // connection before the actual handler. - // - // The order used to call Match determines the priority of matchers. - MatchWithWriters(...MatchWriter) 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) - // sets a timeout for the read of matchers - SetReadTimeout(time.Duration) -} - -type matchersListener struct { - ss []MatchWriter - l muxListener -} - -type cMux struct { - root net.Listener - bufLen int - errh ErrorHandler - donec chan struct{} - sls []matchersListener - readTimeout time.Duration -} - -func matchersToMatchWriters(matchers []Matcher) []MatchWriter { - mws := make([]MatchWriter, 0, len(matchers)) - for _, m := range matchers { - mws = append(mws, func(w io.Writer, r io.Reader) bool { - return m(r) - }) - } - return mws -} - -func (m *cMux) Match(matchers ...Matcher) net.Listener { - mws := matchersToMatchWriters(matchers) - return m.MatchWithWriters(mws...) -} - -func (m *cMux) MatchWithWriters(matchers ...MatchWriter) 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) SetReadTimeout(t time.Duration) { - m.readTimeout = t -} - -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) - if m.readTimeout > noTimeout { - _ = c.SetReadDeadline(time.Now().Add(m.readTimeout)) - } - for _, sl := range m.sls { - for _, s := range sl.ss { - matched := s(muc.Conn, muc.startSniffing()) - if matched { - muc.doneSniffing() - if m.readTimeout > noTimeout { - _ = c.SetReadDeadline(time.Time{}) - } - 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 bufferedReader -} - -func newMuxConn(c net.Conn) *MuxConn { - return &MuxConn{ - Conn: c, - buf: bufferedReader{source: 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) { - return m.buf.Read(p) -} - -func (m *MuxConn) startSniffing() io.Reader { - m.buf.reset(true) - return &m.buf -} - -func (m *MuxConn) doneSniffing() { - m.buf.reset(false) -} diff --git a/vendor/github.com/soheilhy/cmux/doc.go b/vendor/github.com/soheilhy/cmux/doc.go deleted file mode 100644 index aaa8f3158..000000000 --- a/vendor/github.com/soheilhy/cmux/doc.go +++ /dev/null @@ -1,18 +0,0 @@ -// Copyright 2016 The CMux Authors. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -// implied. See the License for the specific language governing -// permissions and limitations under the License. - -// Package cmux is a library to multiplex network connections based on -// their payload. Using cmux, you can serve different protocols from the -// same listener. -package cmux diff --git a/vendor/github.com/soheilhy/cmux/matchers.go b/vendor/github.com/soheilhy/cmux/matchers.go deleted file mode 100644 index 652fd8691..000000000 --- a/vendor/github.com/soheilhy/cmux/matchers.go +++ /dev/null @@ -1,262 +0,0 @@ -// Copyright 2016 The CMux Authors. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -// implied. See the License for the specific language governing -// permissions and limitations under the License. - -package cmux - -import ( - "bufio" - "crypto/tls" - "io" - "io/ioutil" - "net/http" - "strings" - - "golang.org/x/net/http2" - "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 -} - -func prefixByteMatcher(list ...[]byte) Matcher { - pt := newPatriciaTree(list...) - 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...)...) -} - -// TLS matches HTTPS requests. -// -// By default, any TLS handshake packet is matched. An optional whitelist -// of versions can be passed in to restrict the matcher, for example: -// TLS(tls.VersionTLS11, tls.VersionTLS12) -func TLS(versions ...int) Matcher { - if len(versions) == 0 { - versions = []int{ - tls.VersionSSL30, - tls.VersionTLS10, - tls.VersionTLS11, - tls.VersionTLS12, - } - } - prefixes := [][]byte{} - for _, v := range versions { - prefixes = append(prefixes, []byte{22, byte(v >> 8 & 0xff), byte(v & 0xff)}) - } - return prefixByteMatcher(prefixes...) -} - -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, func(gotValue string) bool { - return gotValue == value - }) - } -} - -// HTTP1HeaderFieldPrefix returns a matcher matching the header fields of the -// first request of an HTTP 1 connection. If the header with key name has a -// value prefixed with valuePrefix, this will match. -func HTTP1HeaderFieldPrefix(name, valuePrefix string) Matcher { - return func(r io.Reader) bool { - return matchHTTP1Field(r, name, func(gotValue string) bool { - return strings.HasPrefix(gotValue, valuePrefix) - }) - } -} - -// HTTP2HeaderField returns 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(ioutil.Discard, r, name, func(gotValue string) bool { - return gotValue == value - }) - } -} - -// HTTP2HeaderFieldPrefix returns a matcher matching the header fields of the -// first headers frame. If the header with key name has a value prefixed with -// valuePrefix, this will match. -func HTTP2HeaderFieldPrefix(name, valuePrefix string) Matcher { - return func(r io.Reader) bool { - return matchHTTP2Field(ioutil.Discard, r, name, func(gotValue string) bool { - return strings.HasPrefix(gotValue, valuePrefix) - }) - } -} - -// HTTP2MatchHeaderFieldSendSettings matches the header field and writes the -// settings to the server. Prefer HTTP2HeaderField over this one, if the client -// does not block on receiving a SETTING frame. -func HTTP2MatchHeaderFieldSendSettings(name, value string) MatchWriter { - return func(w io.Writer, r io.Reader) bool { - return matchHTTP2Field(w, r, name, func(gotValue string) bool { - return gotValue == value - }) - } -} - -// HTTP2MatchHeaderFieldPrefixSendSettings matches the header field prefix -// and writes the settings to the server. Prefer HTTP2HeaderFieldPrefix over -// this one, if the client does not block on receiving a SETTING frame. -func HTTP2MatchHeaderFieldPrefixSendSettings(name, valuePrefix string) MatchWriter { - return func(w io.Writer, r io.Reader) bool { - return matchHTTP2Field(w, r, name, func(gotValue string) bool { - return strings.HasPrefix(gotValue, valuePrefix) - }) - } -} - -func hasHTTP2Preface(r io.Reader) bool { - var b [len(http2.ClientPreface)]byte - last := 0 - - for { - n, err := r.Read(b[last:]) - if err != nil { - return false - } - - last += n - eq := string(b[:last]) == http2.ClientPreface[:last] - if last == len(http2.ClientPreface) { - return eq - } - if !eq { - return false - } - } -} - -func matchHTTP1Field(r io.Reader, name string, matches func(string) bool) (matched bool) { - req, err := http.ReadRequest(bufio.NewReader(r)) - if err != nil { - return false - } - - return matches(req.Header.Get(name)) -} - -func matchHTTP2Field(w io.Writer, r io.Reader, name string, matches func(string) bool) (matched bool) { - if !hasHTTP2Preface(r) { - return false - } - - done := false - framer := http2.NewFramer(w, r) - hdec := hpack.NewDecoder(uint32(4<<10), func(hf hpack.HeaderField) { - if hf.Name == name { - done = true - if matches(hf.Value) { - matched = true - } - } - }) - for { - f, err := framer.ReadFrame() - if err != nil { - return false - } - - switch f := f.(type) { - case *http2.SettingsFrame: - if err := framer.WriteSettings(); err != nil { - return false - } - case *http2.ContinuationFrame: - if _, err := hdec.Write(f.HeaderBlockFragment()); err != nil { - return false - } - done = done || f.FrameHeader.Flags&http2.FlagHeadersEndHeaders != 0 - case *http2.HeadersFrame: - if _, err := hdec.Write(f.HeaderBlockFragment()); err != nil { - return false - } - done = done || f.FrameHeader.Flags&http2.FlagHeadersEndHeaders != 0 - } - - if done { - return matched - } - } -} diff --git a/vendor/github.com/soheilhy/cmux/patricia.go b/vendor/github.com/soheilhy/cmux/patricia.go deleted file mode 100644 index c3e3d85bd..000000000 --- a/vendor/github.com/soheilhy/cmux/patricia.go +++ /dev/null @@ -1,179 +0,0 @@ -// Copyright 2016 The CMux Authors. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or -// implied. See the License for the specific language governing -// permissions and limitations under the License. - -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 - maxDepth int // max depth of the tree. -} - -func newPatriciaTree(bs ...[]byte) *patriciaTree { - max := 0 - for _, b := range bs { - if max < len(b) { - max = len(b) - } - } - return &patriciaTree{ - root: newNode(bs), - maxDepth: max + 1, - } -} - -func newPatriciaTreeString(strs ...string) *patriciaTree { - b := make([][]byte, len(strs)) - for i, s := range strs { - b[i] = []byte(s) - } - return newPatriciaTree(b...) -} - -func (t *patriciaTree) matchPrefix(r io.Reader) bool { - buf := make([]byte, t.maxDepth) - n, _ := io.ReadFull(r, buf) - return t.root.match(buf[:n], true) -} - -func (t *patriciaTree) match(r io.Reader) bool { - buf := make([]byte, t.maxDepth) - n, _ := io.ReadFull(r, buf) - return t.root.match(buf[:n], 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 (n *ptNode) match(b []byte, prefix bool) bool { - l := len(n.prefix) - if l > 0 { - if l > len(b) { - l = len(b) - } - if !bytes.Equal(b[:l], n.prefix) { - return false - } - } - - if n.terminal && (prefix || len(n.prefix) == len(b)) { - return true - } - - if l >= len(b) { - return false - } - - nextN, ok := n.next[b[l]] - if !ok { - return false - } - - if l == len(b) { - b = b[l:l] - } else { - b = b[l+1:] - } - return nextN.match(b, prefix) -} |