Refactor and add some tests.

pkg/cloudprovider/providers/azure/BUILD

@@ -68,6 +68,7 @@ go_test(
         "azure_cache_test.go",
         "azure_loadbalancer_test.go",
         "azure_metrics_test.go",
+        "azure_routes_test.go",
         "azure_standard_test.go",
         "azure_storage_test.go",
         "azure_storageaccount_test.go",
@@ -79,6 +80,7 @@ go_test(
     importpath = "k8s.io/kubernetes/pkg/cloudprovider/providers/azure",
     deps = [
         "//pkg/api/v1/service:go_default_library",
+        "//pkg/cloudprovider:go_default_library",
         "//pkg/cloudprovider/providers/azure/auth:go_default_library",
         "//pkg/kubelet/apis:go_default_library",
         "//vendor/github.com/Azure/azure-sdk-for-go/arm/compute:go_default_library",

pkg/cloudprovider/providers/azure/azure_routes.go

@@ -28,18 +28,23 @@ import (
 )
 
 // ListRoutes lists all managed routes that belong to the specified clusterName
-func (az *Cloud) ListRoutes(clusterName string) (routes []*cloudprovider.Route, err error) {
+func (az *Cloud) ListRoutes(clusterName string) ([]*cloudprovider.Route, error) {
 	glog.V(10).Infof("list: START clusterName=%q", clusterName)
 	routeTable, existsRouteTable, err := az.getRouteTable()
+	return processRoutes(routeTable, existsRouteTable, err)
+}
+
+// Injectable for testing
+func processRoutes(routeTable network.RouteTable, exists bool, err error) ([]*cloudprovider.Route, error) {
 	if err != nil {
 		return nil, err
 	}
-	if !existsRouteTable {
+	if !exists {
 		return []*cloudprovider.Route{}, nil
 	}
 
 	var kubeRoutes []*cloudprovider.Route
-	if routeTable.Routes != nil {
+	if routeTable.RouteTablePropertiesFormat != nil && routeTable.Routes != nil {
 		kubeRoutes = make([]*cloudprovider.Route, len(*routeTable.Routes))
 		for i, route := range *routeTable.Routes {
 			instance := mapRouteNameToNodeName(*route.Name)
@@ -58,19 +63,18 @@ func (az *Cloud) ListRoutes(clusterName string) (routes []*cloudprovider.Route,
 	return kubeRoutes, nil
 }
 
-// CreateRoute creates the described managed route
+func (az *Cloud) createRouteTableIfNotExists(clusterName string, kubeRoute *cloudprovider.Route) error {
-// route.Name will be ignored, although the cloud-provider may use nameHint
+	if _, existsRouteTable, err := az.getRouteTable(); err != nil {
-// to create a more user-meaningful name.
-func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *cloudprovider.Route) error {
-	glog.V(2).Infof("create: creating route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
-
-	routeTable, existsRouteTable, err := az.getRouteTable()
-	if err != nil {
 		glog.V(2).Infof("create error: couldn't get routetable. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 		return err
+	} else if existsRouteTable {
+		return nil
 	}
-	if !existsRouteTable {
+	return az.createRouteTable()
-		routeTable = network.RouteTable{
+}
+
+func (az *Cloud) createRouteTable() error {
+	routeTable := network.RouteTable{
 		Name:                       to.StringPtr(az.RouteTableName),
 		Location:                   to.StringPtr(az.Location),
 		RouteTablePropertiesFormat: &network.RouteTablePropertiesFormat{},
@@ -94,13 +98,19 @@ func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *clo
 	}
 
 	glog.V(10).Infof("RouteTablesClient.Get(%q): start", az.RouteTableName)
-		routeTable, err = az.RouteTablesClient.Get(az.ResourceGroup, az.RouteTableName, "")
+	_, err = az.RouteTablesClient.Get(az.ResourceGroup, az.RouteTableName, "")
 	glog.V(10).Infof("RouteTablesClient.Get(%q): end", az.RouteTableName)
-		if err != nil {
+	return err
+}
+
+// CreateRoute creates the described managed route
+// route.Name will be ignored, although the cloud-provider may use nameHint
+// to create a more user-meaningful name.
+func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *cloudprovider.Route) error {
+	glog.V(2).Infof("create: creating route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
+	if err := az.createRouteTableIfNotExists(clusterName, kubeRoute); err != nil {
 		return err
 	}
-	}
-
 	targetIP, err := az.getIPForMachine(kubeRoute.TargetNode)
 	if err != nil {
 		return err

pkg/cloudprovider/providers/azure/azure_routes_test.go

@@ -0,0 +1,175 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 azure
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"k8s.io/kubernetes/pkg/cloudprovider"
+
+	"github.com/Azure/azure-sdk-for-go/arm/network"
+	"github.com/Azure/go-autorest/autorest/to"
+)
+
+func TestCreateRoute(t *testing.T) {
+	fake := newFakeRouteTablesClient()
+	cloud := &Cloud{
+		RouteTablesClient: fake,
+		Config: Config{
+			ResourceGroup:  "foo",
+			RouteTableName: "bar",
+			Location:       "location",
+		},
+	}
+	expectedTable := network.RouteTable{
+		Name:     &cloud.RouteTableName,
+		Location: &cloud.Location,
+	}
+
+	err := cloud.createRouteTable()
+	if err != nil {
+		t.Errorf("unexpected error in creating route table: %v", err)
+		t.FailNow()
+	}
+
+	table := fake.FakeStore["foo"]["bar"]
+	if *table.Location != *expectedTable.Location {
+		t.Errorf("mismatch: %s vs %s", *table.Location, *expectedTable.Location)
+	}
+	if *table.Name != *expectedTable.Name {
+		t.Errorf("mismatch: %s vs %s", *table.Name, *expectedTable.Name)
+	}
+}
+
+func TestProcessRoutes(t *testing.T) {
+	tests := []struct {
+		rt            network.RouteTable
+		exists        bool
+		err           error
+		expectErr     bool
+		expectedError string
+		expectedRoute []cloudprovider.Route
+		name          string
+	}{
+		{
+			err:           fmt.Errorf("test error"),
+			expectErr:     true,
+			expectedError: "test error",
+		},
+		{
+			exists: false,
+			name:   "doesn't exist",
+		},
+		{
+			rt:     network.RouteTable{},
+			exists: true,
+			name:   "nil routes",
+		},
+		{
+			rt: network.RouteTable{
+				RouteTablePropertiesFormat: &network.RouteTablePropertiesFormat{},
+			},
+			exists: true,
+			name:   "no routes",
+		},
+		{
+			rt: network.RouteTable{
+				RouteTablePropertiesFormat: &network.RouteTablePropertiesFormat{
+					Routes: &[]network.Route{
+						{
+							Name: to.StringPtr("name"),
+							RoutePropertiesFormat: &network.RoutePropertiesFormat{
+								AddressPrefix: to.StringPtr("1.2.3.4/16"),
+							},
+						},
+					},
+				},
+			},
+			exists: true,
+			expectedRoute: []cloudprovider.Route{
+				{
+					Name:            "name",
+					TargetNode:      mapRouteNameToNodeName("name"),
+					DestinationCIDR: "1.2.3.4/16",
+				},
+			},
+			name: "one route",
+		},
+		{
+			rt: network.RouteTable{
+				RouteTablePropertiesFormat: &network.RouteTablePropertiesFormat{
+					Routes: &[]network.Route{
+						{
+							Name: to.StringPtr("name"),
+							RoutePropertiesFormat: &network.RoutePropertiesFormat{
+								AddressPrefix: to.StringPtr("1.2.3.4/16"),
+							},
+						},
+						{
+							Name: to.StringPtr("name2"),
+							RoutePropertiesFormat: &network.RoutePropertiesFormat{
+								AddressPrefix: to.StringPtr("5.6.7.8/16"),
+							},
+						},
+					},
+				},
+			},
+			exists: true,
+			expectedRoute: []cloudprovider.Route{
+				{
+					Name:            "name",
+					TargetNode:      mapRouteNameToNodeName("name"),
+					DestinationCIDR: "1.2.3.4/16",
+				},
+				{
+					Name:            "name2",
+					TargetNode:      mapRouteNameToNodeName("name2"),
+					DestinationCIDR: "5.6.7.8/16",
+				},
+			},
+			name: "more routes",
+		},
+	}
+	for _, test := range tests {
+		routes, err := processRoutes(test.rt, test.exists, test.err)
+		if test.expectErr {
+			if err == nil {
+				t.Errorf("%s: unexpected non-error", test.name)
+				continue
+			}
+			if err.Error() != test.expectedError {
+				t.Errorf("%s: Expected error: %v, saw error: %v", test.name, test.expectedError, err.Error())
+				continue
+			}
+		}
+		if !test.expectErr && err != nil {
+			t.Errorf("%s; unexpected error: %v", test.name, err)
+			continue
+		}
+		if len(routes) != len(test.expectedRoute) {
+			t.Errorf("%s: Unexpected difference: %#v vs %#v", test.name, routes, test.expectedRoute)
+			continue
+		}
+		for ix := range test.expectedRoute {
+			if !reflect.DeepEqual(test.expectedRoute[ix], *routes[ix]) {
+				t.Errorf("%s: Unexpected difference: %#v vs %#v", test.name, test.expectedRoute[ix], *routes[ix])
+			}
+		}
+	}
+}

pkg/cloudprovider/providers/azure/azure_test.go

@@ -19,6 +19,8 @@ package azure
 import (
 	"fmt"
 	"math"
+	"net/http"
+	"net/http/httptest"
 	"strings"
 	"testing"
 
@@ -1560,19 +1562,57 @@ func validateEmptyConfig(t *testing.T, config string) {
 	if azureCloud.CloudProviderBackoff != false {
 		t.Errorf("got incorrect value for CloudProviderBackoff")
 	}
-
 	// rate limits should be disabled by default if not explicitly enabled in config
 	if azureCloud.CloudProviderRateLimit != false {
 		t.Errorf("got incorrect value for CloudProviderRateLimit")
 	}
 }
+func TestGetZone(t *testing.T) {
+	data := `{"ID":"_azdev","UD":"0","FD":"99"}`
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, data)
+	}))
+	defer ts.Close()
+
+	cloud := &Cloud{}
+	cloud.Location = "eastus"
+
+	zone, err := cloud.getZoneFromURL(ts.URL)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if zone.FailureDomain != "99" {
+		t.Errorf("Unexpected value: %s, expected '99'", zone.FailureDomain)
+	}
+	if zone.Region != cloud.Location {
+		t.Errorf("Expected: %s, saw: %s", cloud.Location, zone.Region)
+	}
+}
+
+func TestFetchFaultDomain(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, `{"ID":"_azdev","UD":"0","FD":"99"}`)
+	}))
+	defer ts.Close()
+
+	faultDomain, err := fetchFaultDomain(ts.URL)
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	if faultDomain == nil {
+		t.Errorf("Unexpected nil fault domain")
+	}
+	if *faultDomain != "99" {
+		t.Errorf("Expected '99', saw '%s'", *faultDomain)
+	}
+}
 
 func TestDecodeInstanceInfo(t *testing.T) {
 	response := `{"ID":"_azdev","UD":"0","FD":"99"}`
 
 	faultDomain, err := readFaultDomain(strings.NewReader(response))
 	if err != nil {
-		t.Error("Unexpected error in ReadFaultDomain")
+		t.Errorf("Unexpected error in ReadFaultDomain: %v", err)
 	}
 
 	if faultDomain == nil {

pkg/cloudprovider/providers/azure/azure_zones.go

@@ -40,11 +40,16 @@ type instanceInfo struct {
 
 // GetZone returns the Zone containing the current failure zone and locality region that the program is running in
 func (az *Cloud) GetZone() (cloudprovider.Zone, error) {
+	return az.getZoneFromURL(instanceInfoURL)
+}
+
+// This is injectable for testing.
+func (az *Cloud) getZoneFromURL(url string) (cloudprovider.Zone, error) {
 	faultMutex.Lock()
 	defer faultMutex.Unlock()
 	if faultDomain == nil {
 		var err error
-		faultDomain, err = fetchFaultDomain()
+		faultDomain, err = fetchFaultDomain(url)
 		if err != nil {
 			return cloudprovider.Zone{}, err
 		}
@@ -75,8 +80,8 @@ func (az *Cloud) GetZoneByNodeName(nodeName types.NodeName) (cloudprovider.Zone,
 	return az.vmSet.GetZoneByNodeName(string(nodeName))
 }
 
-func fetchFaultDomain() (*string, error) {
+func fetchFaultDomain(url string) (*string, error) {
-	resp, err := http.Get(instanceInfoURL)
+	resp, err := http.Get(url)
 	if err != nil {
 		return nil, err
 	}