Move to logging package (#191)

* Updating comment to remove references to Caddy

* Updating README to mark TODO items complete

* Changing all debug print statements over to use logging package

middleware/kubernetes/README.md

@@ -255,7 +255,7 @@ TBD:
 * Do wildcards search across namespaces? (Yes)
 * Initial implementation assumes that a namespace maps to the first DNS label
   below the zone managed by the kubernetes middleware. This assumption may
-  need to be revised.
+  need to be revised. (Template scheme for record names removes this assumption.)
 
 
 ## TODO
@@ -280,12 +280,13 @@ TBD:
 		* Calculate SRV priority based on number of instances running.
 		  (See SkyDNS README.md)
 	* Functional work
-		* Implement wildcard-based lookup. Minimally support `*`, consider `?` as well.
-        * Note from Miek on PR 181: "SkyDNS also supports the word `any`.
+		* (done) ~~Implement wildcard-based lookup. Minimally support `*`, consider `?` as well.~~
+        * (done) ~~Note from Miek on PR 181: "SkyDNS also supports the word `any`.~~
 		* Implement SkyDNS-style synthetic zones such as "svc" to group k8s objects. (This
 		  should be optional behavior.) Also look at "pod" synthetic zones.
 		* Implement test cases for SkyDNS equivalent functionality.
 	* SkyDNS functionality, as listed in SkyDNS README: https://github.com/kubernetes/kubernetes/blob/release-1.2/cluster/addons/dns/README.md
+		* Expose pods and srv objects.
 		* A records in form of `pod-ip-address.my-namespace.cluster.local`.
 		  For example, a pod with ip `1.2.3.4` in the namespace `default`
 		  with a dns name of `cluster.local` would have an entry:

middleware/kubernetes/handler.go

@@ -2,6 +2,7 @@ package kubernetes
 
 import (
 	"fmt"
+	"log"
 
 	"github.com/miekg/coredns/middleware"
 
@@ -10,7 +11,7 @@ import (
 )
 
 func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
-	fmt.Printf("[debug] here entering ServeDNS: ctx:%v dnsmsg:%v\n", ctx, r)
+	log.Printf("[debug] here entering ServeDNS: ctx:%v dnsmsg:%v\n", ctx, r)
 
 	state := middleware.State{W: w, Req: r}
 	if state.QClass() != dns.ClassINET {

middleware/kubernetes/k8sclient/k8sclient.go

@@ -2,7 +2,7 @@ package k8sclient
 
 import (
 	"errors"
-	"fmt"
+	"log"
 	"net/url"
 	"strings"
 )
@@ -55,7 +55,7 @@ func (c *K8sConnector) GetResourceList() (*ResourceList, error) {
 	err := parseJson(url, resources)
 	// TODO: handle no response from k8s
 	if err != nil {
-		fmt.Printf("[ERROR] Response from kubernetes API for GetResourceList() is: %v\n", err)
+		log.Printf("[ERROR] Response from kubernetes API for GetResourceList() is: %v\n", err)
 		return nil, err
 	}
 
@@ -68,7 +68,7 @@ func (c *K8sConnector) GetNamespaceList() (*NamespaceList, error) {
 	url := makeURL([]string{c.baseURL, apiBase, apiNamespaces})
 	err := parseJson(url, namespaces)
 	if err != nil {
-		fmt.Printf("[ERROR] Response from kubernetes API for GetNamespaceList() is: %v\n", err)
+		log.Printf("[ERROR] Response from kubernetes API for GetNamespaceList() is: %v\n", err)
 		return nil, err
 	}
 
@@ -82,7 +82,7 @@ func (c *K8sConnector) GetServiceList() (*ServiceList, error) {
 	err := parseJson(url, services)
 	// TODO: handle no response from k8s
 	if err != nil {
-		fmt.Printf("[ERROR] Response from kubernetes API for GetServiceList() is: %v\n", err)
+		log.Printf("[ERROR] Response from kubernetes API for GetServiceList() is: %v\n", err)
 		return nil, err
 	}
 
@@ -98,7 +98,7 @@ func (c *K8sConnector) GetServicesByNamespace() (map[string][]ServiceItem, error
 	k8sServiceList, err := c.GetServiceList()
 
 	if err != nil {
-		fmt.Printf("[ERROR] Getting service list produced error: %v", err)
+		log.Printf("[ERROR] Getting service list produced error: %v", err)
 		return nil, err
 	}
 

middleware/kubernetes/kubernetes.go

@@ -3,7 +3,7 @@ package kubernetes
 
 import (
 	"errors"
-	"fmt"
+	"log"
 	"time"
 
 	"github.com/miekg/coredns/middleware"
@@ -62,20 +62,9 @@ func (g Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
 		typeName    string
 	)
 
-	fmt.Println("[debug] enter Records('", name, "', ", exact, ")")
+	log.Printf("[debug] enter Records('%v', '%v')\n", name, exact)
 	zone, serviceSegments := g.getZoneForName(name)
 
-	/*
-	   // For initial implementation, assume namespace is first serviceSegment
-	   // and service name is remaining segments.
-	   serviceSegLen := len(serviceSegments)
-	   if serviceSegLen >= 2 {
-	       namespace = serviceSegments[serviceSegLen-1]
-	       serviceName = strings.Join(serviceSegments[:serviceSegLen-1], ".")
-	   }
-	   // else we are looking up the zone. So handle the NS, SOA records etc.
-	*/
-
 	// TODO: Implementation above globbed together segments for the serviceName if
 	//       multiple segments remained. Determine how to do similar globbing using
 	//		 the template-based implementation.
@@ -85,22 +74,22 @@ func (g Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
 
 	if namespace == "" {
 		err := errors.New("Parsing query string did not produce a namespace value. Assuming wildcard namespace.")
-		fmt.Printf("[WARN] %v\n", err)
+		log.Printf("[WARN] %v\n", err)
 		namespace = util.WildcardStar
 	}
 
 	if serviceName == "" {
 		err := errors.New("Parsing query string did not produce a serviceName value. Assuming wildcard serviceName.")
-		fmt.Printf("[WARN] %v\n", err)
+		log.Printf("[WARN] %v\n", err)
 		serviceName = util.WildcardStar
 	}
 
-	fmt.Println("[debug] exact: ", exact)
-	fmt.Println("[debug] zone: ", zone)
-	fmt.Println("[debug] servicename: ", serviceName)
-	fmt.Println("[debug] namespace: ", namespace)
-	fmt.Println("[debug] typeName: ", typeName)
-	fmt.Println("[debug] APIconn: ", g.APIConn)
+	log.Printf("[debug] exact: %v\n", exact)
+	log.Printf("[debug] zone: %v\n", zone)
+	log.Printf("[debug] servicename: %v\n", serviceName)
+	log.Printf("[debug] namespace: %v\n", namespace)
+	log.Printf("[debug] typeName: %v\n", typeName)
+	log.Printf("[debug] APIconn: %v\n", g.APIConn)
 
 	nsWildcard := util.SymbolContainsWildcard(namespace)
 	serviceWildcard := util.SymbolContainsWildcard(serviceName)
@@ -108,14 +97,14 @@ func (g Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
 	// Abort if the namespace does not contain a wildcard, and namespace is not published per CoreFile
 	// Case where namespace contains a wildcard is handled in Get(...) method.
 	if (!nsWildcard) && (g.Namespaces != nil && !util.StringInSlice(namespace, *g.Namespaces)) {
-		fmt.Printf("[debug] Namespace '%v' is not published by Corefile\n", namespace)
+		log.Printf("[debug] Namespace '%v' is not published by Corefile\n", namespace)
 		return nil, nil
 	}
 
 	k8sItems, err := g.Get(namespace, nsWildcard, serviceName, serviceWildcard)
-	fmt.Println("[debug] k8s items:", k8sItems)
+	log.Printf("[debug] k8s items: %v\n", k8sItems)
 	if err != nil {
-		fmt.Printf("[ERROR] Got error while looking up ServiceItems. Error is: %v\n", err)
+		log.Printf("[ERROR] Got error while looking up ServiceItems. Error is: %v\n", err)
 		return nil, err
 	}
 	if k8sItems == nil {
@@ -133,7 +122,7 @@ func (g Kubernetes) getRecordsForServiceItems(serviceItems []k8sc.ServiceItem, v
 
 	for _, item := range serviceItems {
 		clusterIP := item.Spec.ClusterIP
-		fmt.Println("[debug] clusterIP:", clusterIP)
+		log.Printf("[debug] clusterIP: %v\n", clusterIP)
 
 		// Create records by constructing record name from template...
 		//values.Namespace = item.Metadata.Namespace
@@ -143,13 +132,13 @@ func (g Kubernetes) getRecordsForServiceItems(serviceItems []k8sc.ServiceItem, v
 
 		// Create records for each exposed port...
 		for _, p := range item.Spec.Ports {
-			fmt.Println("[debug]    port:", p.Port)
+			log.Printf("[debug]    port: %v\n", p.Port)
 			s := msg.Service{Host: clusterIP, Port: p.Port}
 			records = append(records, s)
 		}
 	}
 
-	fmt.Printf("[debug] records from getRecordsForServiceItems(): %v\n", records)
+	log.Printf("[debug] records from getRecordsForServiceItems(): %v\n", records)
 	return records
 }
 
@@ -158,7 +147,7 @@ func (g Kubernetes) Get(namespace string, nsWildcard bool, servicename string, s
 	serviceList, err := g.APIConn.GetServiceList()
 
 	if err != nil {
-		fmt.Printf("[ERROR] Getting service list produced error: %v", err)
+		log.Printf("[ERROR] Getting service list produced error: %v", err)
 		return nil, err
 	}
 
@@ -169,7 +158,7 @@ func (g Kubernetes) Get(namespace string, nsWildcard bool, servicename string, s
 			// If namespace has a wildcard, filter results against Corefile namespace list.
 			// (Namespaces without a wildcard were filtered before the call to this function.)
 			if nsWildcard && (g.Namespaces != nil && !util.StringInSlice(item.Metadata.Namespace, *g.Namespaces)) {
-				fmt.Printf("[debug] Namespace '%v' is not published by Corefile\n", item.Metadata.Namespace)
+				log.Printf("[debug] Namespace '%v' is not published by Corefile\n", item.Metadata.Namespace)
 				continue
 			}
 			resultItems = append(resultItems, item)

middleware/kubernetes/nametemplate/nametemplate.go

@@ -2,7 +2,7 @@ package nametemplate
 
 import (
 	"errors"
-	"fmt"
+	"log"
 	"strings"
 
 	"github.com/miekg/coredns/middleware/kubernetes/util"
@@ -65,7 +65,6 @@ type NameTemplate struct {
 
 func (t *NameTemplate) SetTemplate(s string) error {
 	var err error
-	fmt.Println()
 
 	t.Element = map[string]int{}
 
@@ -83,10 +82,10 @@ func (t *NameTemplate) SetTemplate(s string) error {
 		if !elementPositionSet {
 			if strings.Contains(v, "{") {
 				err = errors.New("Record name template contains the unknown symbol '" + v + "'")
-				fmt.Printf("[debug] %v\n", err)
+				log.Printf("[debug] %v\n", err)
 				return err
 			} else {
-				fmt.Printf("[debug] Template string has static element '%v'\n", v)
+				log.Printf("[debug] Template string has static element '%v'\n", v)
 			}
 		}
 	}

middleware/kubernetes/nametemplate/nametemplate_test.go

@@ -1,7 +1,6 @@
 package nametemplate
 
 import (
-	"fmt"
 	"strings"
 	"testing"
 )
@@ -21,7 +20,6 @@ var exampleTemplates = map[string][]int{
 }
 
 func TestSetTemplate(t *testing.T) {
-	fmt.Printf("\n")
 	for s, expectedValue := range exampleTemplates {
 
 		n := new(NameTemplate)

middleware/kubernetes/subzone.go

@@ -1,7 +1,7 @@
 package kubernetes
 
 import (
-	"fmt"
+	"log"
 
 	"github.com/miekg/dns"
 )
@@ -24,7 +24,7 @@ func NormalizeZoneList(zones []string) []string {
 	for _, z := range zones {
 		zoneConflict, _ := subzoneConflict(filteredZones, z)
 		if zoneConflict {
-			fmt.Printf("[WARN] new zone '%v' from Corefile conflicts with existing zones: %v\n        Ignoring zone '%v'\n", z, filteredZones, z)
+			log.Printf("[WARN] new zone '%v' from Corefile conflicts with existing zones: %v\n        Ignoring zone '%v'\n", z, filteredZones, z)
 		} else {
 			filteredZones = append(filteredZones, z)
 		}