kubelet networking plugin

pkg/kubelet/network/exec/exec_test.go

@@ -0,0 +1,179 @@
+// +build linux
+
+/*
+Copyright 2014 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 exec
+
+import (
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/network"
+)
+
+// The temp dir where test plugins will be stored.
+const testPluginPath = "/tmp/fake/plugins/net"
+
+func installPluginUnderTest(t *testing.T, vendorName string, plugName string) {
+	vendoredName := plugName
+	if vendorName != "" {
+		vendoredName = fmt.Sprintf("%s~%s", vendorName, plugName)
+	}
+	pluginDir := path.Join(testPluginPath, vendoredName)
+	err := os.MkdirAll(pluginDir, 0777)
+	if err != nil {
+		t.Errorf("Failed to create plugin: %v", err)
+	}
+	pluginExec := path.Join(pluginDir, plugName)
+	f, err := os.Create(pluginExec)
+	if err != nil {
+		t.Errorf("Failed to install plugin")
+	}
+	err = f.Chmod(0777)
+	if err != nil {
+		t.Errorf("Failed to set exec perms on plugin")
+	}
+	writeStr := fmt.Sprintf("#!/bin/bash\necho -n $@ &> %s", path.Join(pluginDir, plugName+".out"))
+	_, err = f.WriteString(writeStr)
+	if err != nil {
+		t.Errorf("Failed to write plugin exec")
+	}
+	f.Close()
+}
+
+func tearDownPlugin(plugName string) {
+	err := os.RemoveAll(testPluginPath)
+	if err != nil {
+		fmt.Printf("Error in cleaning up test: %v", err)
+	}
+}
+
+func TestSelectPlugin(t *testing.T) {
+	// install some random plugin under testPluginPath
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	installPluginUnderTest(t, "", pluginName)
+
+	plug, err := network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), pluginName, network.NewFakeHost(nil))
+	if err != nil {
+		t.Errorf("Failed to select the desired plugin: %v", err)
+	}
+	if plug.Name() != pluginName {
+		t.Errorf("Wrong plugin selected, chose %s, got %s\n", pluginName, plug.Name())
+	}
+}
+
+func TestSelectVendoredPlugin(t *testing.T) {
+	// install some random plugin under testPluginPath
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	vendor := "mycompany"
+	installPluginUnderTest(t, vendor, pluginName)
+
+	vendoredPluginName := fmt.Sprintf("%s/%s", vendor, pluginName)
+	plug, err := network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), vendoredPluginName, network.NewFakeHost(nil))
+	if err != nil {
+		t.Errorf("Failed to select the desired plugin: %v", err)
+	}
+	if plug.Name() != vendoredPluginName {
+		t.Errorf("Wrong plugin selected, chose %s, got %s\n", vendoredPluginName, plug.Name())
+	}
+}
+
+func TestSelectWrongPlugin(t *testing.T) {
+	// install some random plugin under testPluginPath
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	installPluginUnderTest(t, "", pluginName)
+
+	wrongPlugin := "abcd"
+	plug, err := network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), wrongPlugin, network.NewFakeHost(nil))
+	if plug != nil || err == nil {
+		t.Errorf("Expected to see an error. Wrong plugin selected.")
+	}
+}
+
+func TestPluginValidation(t *testing.T) {
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	installPluginUnderTest(t, "", pluginName)
+
+	// modify the perms of the pluginExecutable
+	f, err := os.Open(path.Join(testPluginPath, pluginName, pluginName))
+	if err != nil {
+		t.Errorf("Nil value expected.")
+	}
+	err = f.Chmod(0444)
+	if err != nil {
+		t.Errorf("Failed to set perms on plugin exec")
+	}
+	f.Close()
+
+	_, err = network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), pluginName, network.NewFakeHost(nil))
+	if err == nil {
+		// we expected an error here because validation would have failed
+		t.Errorf("Expected non-nil value.")
+	}
+}
+
+func TestPluginSetupHook(t *testing.T) {
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	installPluginUnderTest(t, "", pluginName)
+
+	plug, err := network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), pluginName, network.NewFakeHost(nil))
+
+	err = plug.SetUpPod("podNamespace", "podName", "dockerid2345")
+	if err != nil {
+		t.Errorf("Expected nil: %v", err)
+	}
+	// check output of setup hook
+	output, err := ioutil.ReadFile(path.Join(testPluginPath, pluginName, pluginName+".out"))
+	if err != nil {
+		t.Errorf("Expected nil")
+	}
+	expectedOutput := "setup podNamespace podName dockerid2345"
+	if string(output) != expectedOutput {
+		t.Errorf("Mismatch in expected output for setup hook. Expected '%s', got '%s'", expectedOutput, string(output))
+	}
+}
+
+func TestPluginTearDownHook(t *testing.T) {
+	pluginName := fmt.Sprintf("test%d", rand.Intn(1000))
+	defer tearDownPlugin(pluginName)
+	installPluginUnderTest(t, "", pluginName)
+
+	plug, err := network.InitNetworkPlugin(probeNetworkPluginsWithExecDir(testPluginPath), pluginName, network.NewFakeHost(nil))
+
+	err = plug.TearDownPod("podNamespace", "podName", "dockerid2345")
+	if err != nil {
+		t.Errorf("Expected nil")
+	}
+	// check output of setup hook
+	output, err := ioutil.ReadFile(path.Join(testPluginPath, pluginName, pluginName+".out"))
+	if err != nil {
+		t.Errorf("Expected nil")
+	}
+	expectedOutput := "teardown podNamespace podName dockerid2345"
+	if string(output) != expectedOutput {
+		t.Errorf("Mismatch in expected output for teardown hook. Expected '%s', got '%s'", expectedOutput, string(output))
+	}
+}