Add mutex for connect/disconnect locking.

client/connection.go

@@ -8,11 +8,14 @@ import (
 	"github.com/fluffle/golog/logging"
 	"net"
 	"strings"
+	"sync"
 	"time"
 )
 
 // An IRC connection is represented by this struct.
 type Conn struct {
+	// For preventing races on (dis)connect.
+	mu sync.Mutex
 
 	// Contains parameters that people can tweak to change client behaviour.
 	cfg *Config
@@ -164,6 +167,9 @@ func (conn *Conn) ConnectTo(host string, pass ...string) error {
 }
 
 func (conn *Conn) Connect() error {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+
 	if conn.cfg.Server == "" {
 		return fmt.Errorf("irc.Connect(): cfg.Server must be non-empty")
 	}
@@ -326,10 +332,14 @@ func (conn *Conn) rateLimit(chars int) time.Duration {
 func (conn *Conn) shutdown() {
 	// Guard against double-call of shutdown() if we get an error in send()
 	// as calling sock.Close() will cause recv() to receive EOF in readstring()
-	if conn.Connected {
+	conn.mu.Lock()
+	defer conn.mu.Unlock()
+	if !conn.connected {
+		return
+	}
 	logging.Info("irc.shutdown(): Disconnected from server.")
-		conn.dispatch(&Line{Cmd: "disconnected"})
-		conn.Connected = false
+	conn.dispatch(&Line{Cmd: DISCONNECTED})
+	conn.connected = false
 	conn.sock.Close()
 	conn.cSend <- true
 	conn.cLoop <- true
@@ -337,7 +347,6 @@ func (conn *Conn) shutdown() {
 	// reinit datastructures ready for next connection
 	// do this here rather than after runLoop()'s for due to race
 	conn.initialise()
-	}
 }
 
 // Dumps a load of information about the current state of the connection to a