move port splitting to common place; add to node resource location

pkg/registry/minion/rest.go

@@ -24,12 +24,14 @@ import (
 	"strconv"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/validation"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
 )
 
@@ -129,12 +131,21 @@ func MatchNode(label labels.Selector, field fields.Selector) generic.Matcher {
 
 // ResourceLocation returns a URL to which one can send traffic for the specified node.
 func ResourceLocation(getter ResourceGetter, connection client.ConnectionInfoGetter, ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
-	nodeObj, err := getter.Get(ctx, id)
+	name, portReq, valid := util.SplitPort(id)
+	if !valid {
+		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid node request %q", id))
+	}
+
+	nodeObj, err := getter.Get(ctx, name)
 	if err != nil {
 		return nil, nil, err
 	}
 	node := nodeObj.(*api.Node)
-	host := node.Name
+	host := node.Name // TODO: use node's IP, don't expect the name to resolve.
+
+	if portReq != "" {
+		return &url.URL{Host: net.JoinHostPort(host, portReq)}, nil, nil
+	}
 
 	scheme, port, transport, err := connection.GetConnectionInfo(host)
 	if err != nil {

pkg/registry/pod/rest.go

@@ -21,7 +21,6 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"strings"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -31,6 +30,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
 )
 
@@ -150,16 +150,11 @@ func getPod(getter ResourceGetter, ctx api.Context, name string) (*api.Pod, erro
 func ResourceLocation(getter ResourceGetter, ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
 	// Allow ID as "podname" or "podname:port".  If port is not specified,
 	// try to use the first defined port on the pod.
-	parts := strings.Split(id, ":")
-	if len(parts) > 2 {
+	name, port, valid := util.SplitPort(id)
+	if !valid {
 		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid pod request %q", id))
 	}
-	name := parts[0]
-	port := ""
-	if len(parts) == 2 {
-		// TODO: if port is not a number but a "(container)/(portname)", do a name lookup.
-		port = parts[1]
-	}
+	// TODO: if port is not a number but a "(container)/(portname)", do a name lookup.
 
 	pod, err := getPod(getter, ctx, name)
 	if err != nil {

pkg/registry/service/rest.go

@@ -23,7 +23,6 @@ import (
 	"net/http"
 	"net/url"
 	"strconv"
-	"strings"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -34,6 +33,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/endpoint"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/minion"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 	"github.com/golang/glog"
@@ -206,15 +206,10 @@ var _ = rest.Redirector(&REST{})
 // ResourceLocation returns a URL to which one can send traffic for the specified service.
 func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
 	// Allow ID as "svcname" or "svcname:port".
-	parts := strings.Split(id, ":")
-	if len(parts) > 2 {
+	svcName, portStr, valid := util.SplitPort(id)
+	if !valid {
 		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
 	}
-	svcName := parts[0]
-	portStr := ""
-	if len(parts) == 2 {
-		portStr = parts[1]
-	}
 
 	eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
 	if err != nil {

pkg/util/port_split.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"strings"
+)
+
+// Takes a string of the form "name:port" or "name".
+//  * If id is of the form "name" or "name:", then return (name, "", true)
+//  * If id is of the form "name:port", then return (name, port, true)
+//  * Otherwise, return ("", "", false)
+// Additionally, name must be non-empty or valid will be returned false.
+//
+// Port is returned as a string, and it is not required to be numeric (could be
+// used for a named port, for example).
+func SplitPort(id string) (name, port string, valid bool) {
+	parts := strings.Split(id, ":")
+	if len(parts) > 2 {
+		return "", "", false
+	}
+	if len(parts) == 2 {
+		return parts[0], parts[1], len(parts[0]) > 0
+	}
+	return id, "", len(id) > 0
+}

pkg/util/port_split_test.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"testing"
+)
+
+func TestSplitPort(t *testing.T) {
+	table := []struct {
+		in         string
+		name, port string
+		valid      bool
+	}{
+		{
+			in:    "aoeu:asdf",
+			name:  "aoeu",
+			port:  "asdf",
+			valid: true,
+		}, {
+			in:    "aoeu:",
+			name:  "aoeu",
+			valid: true,
+		}, {
+			in:   ":asdf",
+			name: "",
+			port: "asdf",
+		}, {
+			in: "aoeu:asdf:htns",
+		}, {
+			in:    "aoeu",
+			name:  "aoeu",
+			valid: true,
+		}, {
+			in: "",
+		},
+	}
+
+	for _, item := range table {
+		name, port, valid := SplitPort(item.in)
+		if e, a := item.name, name; e != a {
+			t.Errorf("%q: Wanted %q, got %q", item.in, e, a)
+		}
+		if e, a := item.port, port; e != a {
+			t.Errorf("%q: Wanted %q, got %q", item.in, e, a)
+		}
+		if e, a := item.valid, valid; e != a {
+			t.Errorf("%q: Wanted %q, got %q", item.in, e, a)
+		}
+	}
+}