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135 lines
2.7 KiB
Go
135 lines
2.7 KiB
Go
// Copyright 2014 Vic Demuzere
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//
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// Use of this source code is governed by the MIT license.
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package irc
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import (
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"bufio"
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"io"
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"net"
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"sync"
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)
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// Messages are delimited with CR and LF line endings,
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// we're using the last one to split the stream. Both are removed
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// during message parsing.
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const delim byte = '\n'
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var endline = []byte("\r\n")
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// A Conn represents an IRC network protocol connection.
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// It consists of an Encoder and Decoder to manage I/O.
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type Conn struct {
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Encoder
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Decoder
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conn io.ReadWriteCloser
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}
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// NewConn returns a new Conn using rwc for I/O.
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func NewConn(rwc io.ReadWriteCloser) *Conn {
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return &Conn{
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Encoder: Encoder{
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writer: rwc,
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},
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Decoder: Decoder{
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reader: bufio.NewReader(rwc),
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},
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conn: rwc,
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}
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}
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// Dial connects to the given address using net.Dial and
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// then returns a new Conn for the connection.
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func Dial(addr string) (*Conn, error) {
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c, err := net.Dial("tcp", addr)
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if err != nil {
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return nil, err
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}
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return NewConn(c), nil
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}
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// Close closes the underlying ReadWriteCloser.
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func (c *Conn) Close() error {
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return c.conn.Close()
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}
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// A Decoder reads Message objects from an input stream.
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type Decoder struct {
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reader *bufio.Reader
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line string
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mu sync.Mutex
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}
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// NewDecoder returns a new Decoder that reads from r.
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func NewDecoder(r io.Reader) *Decoder {
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return &Decoder{
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reader: bufio.NewReader(r),
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}
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}
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// Decode attempts to read a single Message from the stream.
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//
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// Returns a non-nil error if the read failed.
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func (dec *Decoder) Decode() (m *Message, err error) {
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dec.mu.Lock()
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dec.line, err = dec.reader.ReadString(delim)
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dec.mu.Unlock()
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if err != nil {
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return nil, err
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}
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return ParseMessage(dec.line), nil
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}
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// An Encoder writes Message objects to an output stream.
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type Encoder struct {
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writer io.Writer
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mu sync.Mutex
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}
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// NewEncoder returns a new Encoder that writes to w.
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func NewEncoder(w io.Writer) *Encoder {
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return &Encoder{
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writer: w,
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}
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}
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// Encode writes the IRC encoding of m to the stream.
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//
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// This method may be used from multiple goroutines.
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//
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// Returns an non-nil error if the write to the underlying stream stopped early.
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func (enc *Encoder) Encode(m *Message) (err error) {
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_, err = enc.Write(m.Bytes())
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return
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}
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// Write writes len(p) bytes from p followed by CR+LF.
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//
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// This method can be used simultaneously from multiple goroutines,
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// it guarantees to serialize access. However, writing a single IRC message
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// using multiple Write calls will cause corruption.
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func (enc *Encoder) Write(p []byte) (n int, err error) {
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enc.mu.Lock()
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n, err = enc.writer.Write(p)
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if err != nil {
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enc.mu.Unlock()
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return
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}
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_, err = enc.writer.Write(endline)
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enc.mu.Unlock()
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return
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}
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