move logging server into own file, improve cleanup

logging/main.go

@@ -1,9 +1,6 @@
 package logging
 
 import (
-	"fmt"
-	"net"
-	"sync"
 	"time"
 
 	"github.com/op/go-logging"
@@ -11,12 +8,10 @@ import (
 
 const (
 	size = 1024
-	path = "/tmp/ctop.sock"
 )
 
 var (
 	Log    *CTopLogger
-	wg     sync.WaitGroup
 	exited bool
 	level  = logging.INFO
 	format = logging.MustStringFormatter(
@@ -47,44 +42,6 @@ func Init() *CTopLogger {
 	return Log
 }
 
-func (log *CTopLogger) Exit() {
-	exited = true
-	wg.Wait()
-}
-
-func (log *CTopLogger) StartServer() {
-	ln, err := net.Listen("unix", path)
-	if err != nil {
-		panic(err)
-	}
-
-	go func() {
-		for {
-			conn, err := ln.Accept()
-			if err != nil {
-				if err, ok := err.(net.Error); ok && err.Temporary() {
-					continue
-				}
-				return
-			}
-			go log.handler(conn)
-		}
-	}()
-
-	log.Notice("logging server started")
-}
-
-func (log *CTopLogger) handler(conn net.Conn) {
-	wg.Add(1)
-	defer wg.Done()
-	defer conn.Close()
-	for msg := range log.tail() {
-		msg = fmt.Sprintf("%s\n", msg)
-		conn.Write([]byte(msg))
-	}
-	conn.Write([]byte("bye\n"))
-}
-
 func (log *CTopLogger) tail() chan string {
 	stream := make(chan string)
 
@@ -109,3 +66,8 @@ func (log *CTopLogger) tail() chan string {
 
 	return stream
 }
+
+func (log *CTopLogger) Exit() {
+	exited = true
+	StopServer()
+}

logging/server.go

@@ -0,0 +1,59 @@
+package logging
+
+import (
+	"fmt"
+	"net"
+	"sync"
+)
+
+const (
+	path = "/tmp/ctop.sock"
+)
+
+var server struct {
+	wg sync.WaitGroup
+	ln net.Listener
+}
+
+func getListener() net.Listener {
+	ln, err := net.Listen("unix", path)
+	if err != nil {
+		panic(err)
+	}
+	return ln
+}
+
+func StartServer() {
+	server.ln = getListener()
+
+	go func() {
+		for {
+			conn, err := server.ln.Accept()
+			if err != nil {
+				if err, ok := err.(net.Error); ok && err.Temporary() {
+					continue
+				}
+				return
+			}
+			go handler(conn)
+		}
+	}()
+
+	Log.Notice("logging server started")
+}
+
+func StopServer() {
+	server.wg.Wait()
+	server.ln.Close()
+}
+
+func handler(conn net.Conn) {
+	server.wg.Add(1)
+	defer server.wg.Done()
+	defer conn.Close()
+	for msg := range Log.tail() {
+		msg = fmt.Sprintf("%s\n", msg)
+		conn.Write([]byte(msg))
+	}
+	conn.Write([]byte("bye\n"))
+}

main.go

@@ -12,7 +12,7 @@ func main() {
 	config.Init()
 	log = logging.Init()
 	if config.GetSwitchVal("loggingEnabled") {
-		log.StartServer()
+		logging.StartServer()
 	}
 	if err := ui.Init(); err != nil {
 		panic(err)