Fix ipv6 parsing in client

Old implementation of function ParseConnectionString would parse ipv6 incorrectly

Added a unit test for this

client/influxdb.go

@@ -38,22 +38,21 @@ func ParseConnectionString(path string, ssl bool) (url.URL, error) {
 	var host string
 	var port int
 
-	if strings.Contains(path, ":") {
-		h := strings.Split(path, ":")
-		i, e := strconv.Atoi(h[1])
-		if e != nil {
-			return url.URL{}, fmt.Errorf("invalid port number %q: %s\n", path, e)
-		}
-		port = i
-		if h[0] == "" {
+	h, p, err := net.SplitHostPort(path)
+	if err != nil {
+		if path == "" {
 			host = DefaultHost
 		} else {
-			host = h[0]
+			host = path
 		}
-	} else {
-		host = path
 		// If they didn't specify a port, always use the default port
 		port = DefaultPort
+	} else {
+		host = h
+		port, err = strconv.Atoi(p)
+		if err != nil {
+			return url.URL{}, fmt.Errorf("invalid port number %q: %s\n", path, err)
+		}
 	}
 
 	u := url.URL{
@@ -62,6 +61,7 @@ func ParseConnectionString(path string, ssl bool) (url.URL, error) {
 	if ssl {
 		u.Scheme = "https"
 	}
+
 	u.Host = net.JoinHostPort(host, strconv.Itoa(port))
 
 	return u, nil

client/influxdb_test.go

@@ -547,3 +547,14 @@ func TestClient_NoTimeout(t *testing.T) {
 		t.Fatalf("unexpected error.  expected %v, actual %v", nil, err)
 	}
 }
+
+func TestClient_ParseConnectionString_IPv6(t *testing.T) {
+	path := "[fdf5:9ede:1875:0:a9ee:a600:8fe3:d495]:8086"
+	u, err := client.ParseConnectionString(path, false)
+	if err != nil {
+		t.Fatalf("unexpected error, expected %v, actual %v", nil, err)
+	}
+	if u.Host != path {
+		t.Fatalf("ipv6 parse failed, expected %s, actual %s", path, u.Host)
+	}
+}