Ignoring # comments in file discovery.

Signed-off-by: Yucong Sun <sunyucong@email.com>

discovery/file/file.go

@@ -28,6 +28,17 @@ func (s *FileDiscoveryService) Initialize(path string, heartbeat int) error {
 func parseFileContent(content []byte) []string {
 	var result []string
 	for _, line := range strings.Split(strings.TrimSpace(string(content)), "\n") {
+		line = strings.TrimSpace(line)
+		// Ignoring line starts with #
+		if strings.HasPrefix(line, "#") {
+			continue
+		}
+		// Inlined # comment also ignored.
+		if strings.Contains(line, "#") {
+			line = line[0:strings.Index(line, "#")]
+			// Trim additional spaces caused by above stripping.
+			line = strings.TrimSpace(line)
+		}
 		for _, ip := range discovery.Generate(line) {
 			result = append(result, ip)
 		}

discovery/file/file_test.go

@@ -29,3 +29,16 @@ func TestRegister(t *testing.T) {
 	discovery := &FileDiscoveryService{path: "/path/to/file"}
 	assert.Error(t, discovery.Register("0.0.0.0"))
 }
+
+func TestParsingContentsWithComments(t *testing.T) {
+	data := `
+### test ###
+1.1.1.1:1111 # inline comment
+# 2.2.2.2:2222
+      ### empty line with comment
+### test ###
+`
+	ips := parseFileContent([]byte(data))
+	assert.Equal(t, 1, len(ips))
+	assert.Equal(t, "1.1.1.1:1111", ips[0])
+}