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136 lines
3.1 KiB
Go
136 lines
3.1 KiB
Go
package irc
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import (
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"bufio"
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"bytes"
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"net"
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"unicode/utf8"
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"github.com/gorilla/websocket"
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"github.com/goshuirc/irc-go/ircmsg"
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"github.com/oragono/oragono/irc/utils"
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)
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const (
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maxReadQBytes = ircmsg.MaxlenTagsFromClient + 512 + 1024
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)
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var (
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crlf = []byte{'\r', '\n'}
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)
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// IRCConn abstracts away the distinction between a regular
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// net.Conn (which includes both raw TCP and TLS) and a websocket.
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// it doesn't expose the net.Conn, io.Reader, or io.Writer interfaces
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// because websockets are message-oriented, not stream-oriented, and
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// therefore this abstraction is message-oriented as well.
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type IRCConn interface {
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UnderlyingConn() *utils.WrappedConn
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// these take an IRC line or lines, correctly terminated with CRLF:
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WriteLine([]byte) error
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WriteLines([][]byte) error
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// this returns an IRC line without the terminating CRLF:
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ReadLine() (line []byte, err error)
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Close() error
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}
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// IRCStreamConn is an IRCConn over a regular stream connection.
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type IRCStreamConn struct {
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conn *utils.WrappedConn
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reader *bufio.Reader
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}
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func NewIRCStreamConn(conn *utils.WrappedConn) *IRCStreamConn {
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return &IRCStreamConn{
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conn: conn,
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}
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}
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func (cc *IRCStreamConn) UnderlyingConn() *utils.WrappedConn {
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return cc.conn
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}
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func (cc *IRCStreamConn) WriteLine(buf []byte) (err error) {
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_, err = cc.conn.Write(buf)
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return
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}
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func (cc *IRCStreamConn) WriteLines(buffers [][]byte) (err error) {
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// on Linux, with a plaintext TCP or Unix domain socket,
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// the Go runtime will optimize this into a single writev(2) call:
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_, err = (*net.Buffers)(&buffers).WriteTo(cc.conn)
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return
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}
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func (cc *IRCStreamConn) ReadLine() (line []byte, err error) {
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// lazy initialize the reader in case the IP is banned
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if cc.reader == nil {
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cc.reader = bufio.NewReaderSize(cc.conn, maxReadQBytes)
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}
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var isPrefix bool
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line, isPrefix, err = cc.reader.ReadLine()
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if isPrefix {
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return nil, errReadQ
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}
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line = bytes.TrimSuffix(line, crlf)
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return
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}
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func (cc *IRCStreamConn) Close() (err error) {
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return cc.conn.Close()
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}
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// IRCWSConn is an IRCConn over a websocket.
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type IRCWSConn struct {
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conn *websocket.Conn
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}
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func NewIRCWSConn(conn *websocket.Conn) IRCWSConn {
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return IRCWSConn{conn: conn}
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}
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func (wc IRCWSConn) UnderlyingConn() *utils.WrappedConn {
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// just assume that the type is OK
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wConn, _ := wc.conn.UnderlyingConn().(*utils.WrappedConn)
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return wConn
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}
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func (wc IRCWSConn) WriteLine(buf []byte) (err error) {
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buf = bytes.TrimSuffix(buf, crlf)
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// there's not much we can do about this;
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// silently drop the message
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if !utf8.Valid(buf) {
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return nil
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}
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return wc.conn.WriteMessage(websocket.TextMessage, buf)
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}
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func (wc IRCWSConn) WriteLines(buffers [][]byte) (err error) {
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for _, buf := range buffers {
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err = wc.WriteLine(buf)
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if err != nil {
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return
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}
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}
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return
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}
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func (wc IRCWSConn) ReadLine() (line []byte, err error) {
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for {
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var messageType int
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messageType, line, err = wc.conn.ReadMessage()
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// on empty message or non-text message, try again, block if necessary
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if err != nil || (messageType == websocket.TextMessage && len(line) != 0) {
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return
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}
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}
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}
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func (wc IRCWSConn) Close() (err error) {
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return wc.conn.Close()
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}
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