Add integration test framework

Signed-off-by: Lantao Liu <lantaol@google.com>

integration/imagefs_info_test.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2017 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 integration
+
+import (
+	"fmt"
+	"io/ioutil"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
+)
+
+func TestImageFSInfo(t *testing.T) {
+	t.Logf("Pull an image to make sure image fs is not empty")
+	img, err := imageService.PullImage(&runtime.ImageSpec{Image: "busybox"}, nil)
+	require.NoError(t, err)
+	defer func() {
+		err := imageService.RemoveImage(&runtime.ImageSpec{Image: img})
+		assert.NoError(t, err)
+	}()
+	t.Logf("Create a sandbox to make sure there is an active snapshot")
+	config := PodSandboxConfig("running-pod", "imagefs")
+	sb, err := runtimeService.RunPodSandbox(config)
+	require.NoError(t, err)
+	defer func() {
+		assert.NoError(t, runtimeService.StopPodSandbox(sb))
+		assert.NoError(t, runtimeService.RemovePodSandbox(sb))
+	}()
+
+	// It takes time to populate imagefs stats. Use eventually
+	// to check for a period of time.
+	t.Logf("Check imagefs info")
+	var info *runtime.FilesystemUsage
+	require.NoError(t, Eventually(func() (bool, error) {
+		stats, err := imageService.ImageFsInfo()
+		if err != nil {
+			return false, err
+		}
+		if len(stats) == 0 {
+			return false, nil
+		}
+		if len(stats) >= 2 {
+			return false, fmt.Errorf("unexpected stats length: %d", len(stats))
+		}
+		info = stats[0]
+		if info.GetTimestamp() != 0 &&
+			info.GetUsedBytes().GetValue() != 0 &&
+			info.GetInodesUsed().GetValue() != 0 &&
+			info.GetStorageId().GetUuid() != "" {
+			return true, nil
+		}
+		return false, nil
+	}, time.Second, 30*time.Second))
+
+	t.Logf("Device uuid should exist")
+	files, err := ioutil.ReadDir("/dev/disk/by-uuid")
+	require.NoError(t, err)
+	var names []string
+	for _, f := range files {
+		names = append(names, f.Name())
+	}
+	assert.Contains(t, names, info.GetStorageId().GetUuid())
+}

integration/test_utils.go

@@ -0,0 +1,95 @@
+/*
+Copyright 2017 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 integration
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/kubelet/apis/cri"
+	"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
+	"k8s.io/kubernetes/pkg/kubelet/remote"
+
+	"github.com/kubernetes-incubator/cri-containerd/pkg/util"
+)
+
+const (
+	sock    = "/var/run/cri-containerd.sock"
+	timeout = 1 * time.Minute
+)
+
+var (
+	runtimeService cri.RuntimeService
+	imageService   cri.ImageManagerService
+)
+
+func init() {
+	var err error
+	runtimeService, err = remote.NewRemoteRuntimeService(sock, timeout)
+	if err != nil {
+		glog.Exitf("Failed to create runtime service: %v", err)
+	}
+	imageService, err = remote.NewRemoteImageService(sock, timeout)
+	if err != nil {
+		glog.Exitf("Failed to create image service: %v", err)
+	}
+}
+
+// Opts sets specific information in pod sandbox config.
+type PodSandboxOpts func(*runtime.PodSandboxConfig)
+
+// PodSandboxConfig generates a pod sandbox config for test.
+func PodSandboxConfig(name, ns string, opts ...PodSandboxOpts) *runtime.PodSandboxConfig {
+	config := &runtime.PodSandboxConfig{
+		Metadata: &runtime.PodSandboxMetadata{
+			Name: name,
+			// Using random id as uuid is good enough for local
+			// integration test.
+			Uid:       util.GenerateID(),
+			Namespace: ns,
+		},
+		Linux: &runtime.LinuxPodSandboxConfig{},
+	}
+	for _, opt := range opts {
+		opt(config)
+	}
+	return config
+}
+
+// CheckFunc is the function used to check a condition is true/false.
+type CheckFunc func() (bool, error)
+
+// Eventually waits for f to return true, it checks every period, and
+// returns error if timeout exceeds. If f returns error, Eventually
+// will return the same error immediately.
+func Eventually(f CheckFunc, period, timeout time.Duration) error {
+	start := time.Now()
+	for {
+		done, err := f()
+		if done {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		if time.Since(start) >= timeout {
+			return errors.New("timeout exceeded")
+		}
+		time.Sleep(period)
+	}
+}