[tail] unix socket support

cmd/circolog-tail/main.go

@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"log"
+	"net"
 	"net/url"
 	"os"
 	"os/signal"
@@ -14,19 +15,36 @@ import (
 
 func main() {
 	addr := flag.String("addr", "localhost:9080", "http service address")
+	querySocket := flag.String("socket", "", "Path to a unix domain socket for the HTTP server")
 	flag.Parse()
-	fmt.Println("vim-go")
-	u := url.URL{Scheme: "ws", Host: *addr, Path: "/ws"}
-	log.Printf("connecting to %s", u.String())
 
 	interrupt := make(chan os.Signal, 1)
 	signal.Notify(interrupt, os.Interrupt)
+	var d *websocket.Dialer
+	u := url.URL{Scheme: "ws",
+		Host: *addr, // ignored in case of -socket; see the Dialer below
+		Path: "/ws",
+	}
+	if *querySocket != "" {
+		d = &websocket.Dialer{
+			NetDial: func(network, addr string) (net.Conn, error) {
+				return net.Dial("unix", *querySocket)
+			},
+			HandshakeTimeout: 45 * time.Second, // same as DefaultDialer
+		}
+
+		log.Printf("connecting to %s", *querySocket)
+	} else {
+		d = websocket.DefaultDialer
+		log.Printf("connecting to %s", *addr)
+	}
 
-	c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
+	c, _, err := d.Dial(u.String(), nil)
 	if err != nil {
 		log.Fatal("dial:", err)
 	}
 	defer c.Close()
+	log.Println("connected!", u.String())
 
 	done := make(chan struct{})