fix for #126, nginx plugin not catching net.SplitHostPort error

plugins/nginx/nginx.go

@@ -20,7 +20,7 @@ type Nginx struct {
 
 var sampleConfig = `
 # An array of Nginx stub_status URI to gather stats.
-urls = ["localhost/status"]`
+urls = ["http://localhost/status"]`
 
 func (n *Nginx) SampleConfig() string {
 	return sampleConfig
@@ -125,8 +125,8 @@ func (n *Nginx) gatherUrl(addr *url.URL, acc plugins.Accumulator) error {
 		return err
 	}
 
-	host, _, _ := net.SplitHostPort(addr.Host)
-	tags := map[string]string{"server": host}
+	tags := getTags(addr)
+
 	acc.Add("active", active, tags)
 	acc.Add("accepts", accepts, tags)
 	acc.Add("handled", handled, tags)
@@ -138,6 +138,18 @@ func (n *Nginx) gatherUrl(addr *url.URL, acc plugins.Accumulator) error {
 	return nil
 }
 
+// Get tag(s) for the nginx plugin
+func getTags(addr *url.URL) map[string]string {
+	h := addr.Host
+	var htag string
+	if host, _, err := net.SplitHostPort(h); err == nil {
+		htag = host
+	} else {
+		htag = h
+	}
+	return map[string]string{"server": htag}
+}
+
 func init() {
 	plugins.Add("nginx", func() plugins.Plugin {
 		return &Nginx{}

plugins/nginx/nginx_test.go

@@ -14,12 +14,23 @@ import (
 )
 
 const sampleResponse = `
-Active connections: 585 
+Active connections: 585
 server accepts handled requests
- 85340 85340 35085 
-Reading: 4 Writing: 135 Waiting: 446 
+ 85340 85340 35085
+Reading: 4 Writing: 135 Waiting: 446
 `
 
+// Verify that nginx tags are properly parsed based on the server
+func TestNginxTags(t *testing.T) {
+	urls := []string{"http://localhost/endpoint", "http://localhost:80/endpoint"}
+	var addr *url.URL
+	for _, url1 := range urls {
+		addr, _ = url.Parse(url1)
+		tagMap := getTags(addr)
+		assert.Contains(t, tagMap["server"], "localhost")
+	}
+}
+
 func TestNginxGeneratesMetrics(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		var rsp string