golint cleanup (#828)

Clean up some golint related issues.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

middleware/file/zone.go

@@ -56,6 +56,7 @@ func NewZone(name, file string) *Zone {
 	return z
 }
 
+// Copy copies a zone.
 func (z *Zone) Copy() *Zone {
 	z1 := NewZone(z.origin, z.file)
 	z1.TransferTo = z.TransferTo

middleware/kubernetes/autopath.go

@@ -14,7 +14,6 @@ import "github.com/miekg/dns"
 //   is NXDOMAIN (NameError).  This is needed to support the AutoPath.OnNXDOMAIN
 //   function, which returns a NOERROR to client instead of NXDOMAIN if the final
 //   search in the path fails to produce results.
-
 type AutoPathWriter struct {
 	dns.ResponseWriter
 	original dns.Question

middleware/kubernetes/kubernetes.go

@@ -49,6 +49,7 @@ type Kubernetes struct {
 	interfaceAddrsFunc func() net.IP
 }
 
+// AutoPath enables server side search path lookups for pods
 type AutoPath struct {
 	Enabled        bool
 	NDots          int
@@ -683,6 +684,8 @@ func splitSearch(zone, question, namespace string) (name, search string, ok bool
 }
 
 const (
+	// Svc is the DNS schema for kubernetes services
 	Svc = "svc"
+	// Pod is the DNS schema for kubernetes pods
 	Pod = "pod"
 )

middleware/pkg/tls/tls.go

@@ -106,7 +106,7 @@ func loadRoots(caPath string) (*x509.CertPool, error) {
 	return roots, nil
 }
 
-// NetHTTPSTransport returns an HTTP transport configured using tls.Config
+// NewHTTPSTransport returns an HTTP transport configured using tls.Config
 func NewHTTPSTransport(cc *tls.Config) *http.Transport {
 	// this seems like a bad idea but was here in the previous version
 	if cc != nil {

middleware/proxy/proxy.go

@@ -61,7 +61,7 @@ type UpstreamHost struct {
 	FailTimeout       time.Duration
 	OkUntil           time.Time
 	CheckDown         UpstreamHostDownFunc
-	CheckUrl          string
+	CheckURL          string
 	WithoutPathPrefix string
 	Checking          bool
 	checkMu           sync.Mutex

middleware/proxy/upstream.go

@@ -273,7 +273,7 @@ func parseBlock(c *caddyfile.Dispenser, u *staticUpstream) error {
 // otherwise checks will back up, potentially a lot of them if a host is
 // absent for a long time.  This arrangement makes checks quickly see if
 // they are the only one running and abort otherwise.
-func healthCheckUrl(nextTs time.Time, host *UpstreamHost) {
+func healthCheckURL(nextTs time.Time, host *UpstreamHost) {
 
 	// lock for our bool check.  We don't just defer the unlock because
 	// we don't want the lock held while http.Get runs
@@ -294,7 +294,7 @@ func healthCheckUrl(nextTs time.Time, host *UpstreamHost) {
 	// when the remote host is not merely not serving, but actually
 	// absent, then tcp syn timeouts can be very long, and so one
 	// fetch could last several check intervals
-	if r, err := http.Get(host.CheckUrl); err == nil {
+	if r, err := http.Get(host.CheckURL); err == nil {
 		io.Copy(ioutil.Discard, r.Body)
 		r.Body.Close()
 
@@ -317,7 +317,7 @@ func healthCheckUrl(nextTs time.Time, host *UpstreamHost) {
 func (u *staticUpstream) healthCheck() {
 	for _, host := range u.Hosts {
 
-		if host.CheckUrl == "" {
+		if host.CheckURL == "" {
 			var hostName, checkPort string
 
 			// The DNS server might be an HTTP server.  If so, extract its name.
@@ -338,14 +338,14 @@ func (u *staticUpstream) healthCheck() {
 				checkPort = u.HealthCheck.Port
 			}
 
-			host.CheckUrl = "http://" + net.JoinHostPort(checkHostName, checkPort) + u.HealthCheck.Path
+			host.CheckURL = "http://" + net.JoinHostPort(checkHostName, checkPort) + u.HealthCheck.Path
 		}
 
 		// calculate this before the get
 		nextTs := time.Now().Add(u.Future)
 
 		// locks/bools should prevent requests backing up
-		go healthCheckUrl(nextTs, host)
+		go healthCheckURL(nextTs, host)
 	}
 }