/*
Copyright 2015 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 e2e

import (
	"fmt"
	"os"
	"path"
	"sync"
	"testing"
	"time"

	"github.com/golang/glog"
	"github.com/onsi/ginkgo"
	"github.com/onsi/ginkgo/config"
	"github.com/onsi/ginkgo/reporters"
	"github.com/onsi/gomega"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/v1"
	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/release_1_5"
	gcecloud "k8s.io/kubernetes/pkg/cloudprovider/providers/gce"
	"k8s.io/kubernetes/pkg/runtime"
	"k8s.io/kubernetes/pkg/util/logs"
	runtimeutils "k8s.io/kubernetes/pkg/util/runtime"
	utilyaml "k8s.io/kubernetes/pkg/util/yaml"
	commontest "k8s.io/kubernetes/test/e2e/common"
	"k8s.io/kubernetes/test/e2e/framework"
	"k8s.io/kubernetes/test/e2e/generated"
	testutils "k8s.io/kubernetes/test/utils"
)

const (
	// imagePrePullingTimeout is the time we wait for the e2e-image-puller
	// static pods to pull the list of seeded images. If they don't pull
	// images within this time we simply log their output and carry on
	// with the tests.
	imagePrePullingTimeout = 5 * time.Minute
)

var (
	cloudConfig = &framework.TestContext.CloudConfig
)

// setupProviderConfig validates and sets up cloudConfig based on framework.TestContext.Provider.
func setupProviderConfig() error {
	switch framework.TestContext.Provider {
	case "":
		glog.Info("The --provider flag is not set.  Treating as a conformance test.  Some tests may not be run.")

	case "gce", "gke":
		var err error
		framework.Logf("Fetching cloud provider for %q\r\n", framework.TestContext.Provider)
		zone := framework.TestContext.CloudConfig.Zone
		region, err := gcecloud.GetGCERegion(zone)
		if err != nil {
			return fmt.Errorf("error parsing GCE/GKE region from zone %q: %v", zone, err)
		}
		managedZones := []string{zone} // Only single-zone for now
		cloudConfig.Provider, err = gcecloud.CreateGCECloud(framework.TestContext.CloudConfig.ProjectID, region, zone, managedZones, "" /* networkUrl */, nil /* nodeTags */, "" /* nodeInstancePerfix */, nil /* tokenSource */, false /* useMetadataServer */)
		if err != nil {
			return fmt.Errorf("Error building GCE/GKE provider: %v", err)
		}

	case "aws":
		if cloudConfig.Zone == "" {
			return fmt.Errorf("gce-zone must be specified for AWS")
		}
	}

	return nil
}

// There are certain operations we only want to run once per overall test invocation
// (such as deleting old namespaces, or verifying that all system pods are running.
// Because of the way Ginkgo runs tests in parallel, we must use SynchronizedBeforeSuite
// to ensure that these operations only run on the first parallel Ginkgo node.
//
// This function takes two parameters: one function which runs on only the first Ginkgo node,
// returning an opaque byte array, and then a second function which runs on all Ginkgo nodes,
// accepting the byte array.
var _ = ginkgo.SynchronizedBeforeSuite(func() []byte {
	// Run only on Ginkgo node 1

	if err := setupProviderConfig(); err != nil {
		framework.Failf("Failed to setup provider config: %v", err)
	}

	c, err := framework.LoadClientset()
	if err != nil {
		glog.Fatal("Error loading client: ", err)
	}

	// Delete any namespaces except default and kube-system. This ensures no
	// lingering resources are left over from a previous test run.
	if framework.TestContext.CleanStart {
		deleted, err := framework.DeleteNamespaces(c, nil /* deleteFilter */, []string{api.NamespaceSystem, v1.NamespaceDefault})
		if err != nil {
			framework.Failf("Error deleting orphaned namespaces: %v", err)
		}
		glog.Infof("Waiting for deletion of the following namespaces: %v", deleted)
		if err := framework.WaitForNamespacesDeleted(c, deleted, framework.NamespaceCleanupTimeout); err != nil {
			framework.Failf("Failed to delete orphaned namespaces %v: %v", deleted, err)
		}
	}

	// In large clusters we may get to this point but still have a bunch
	// of nodes without Routes created. Since this would make a node
	// unschedulable, we need to wait until all of them are schedulable.
	framework.ExpectNoError(framework.WaitForAllNodesSchedulable(c, framework.NodeSchedulableTimeout))

	// Ensure all pods are running and ready before starting tests (otherwise,
	// cluster infrastructure pods that are being pulled or started can block
	// test pods from running, and tests that ensure all pods are running and
	// ready will fail).
	podStartupTimeout := framework.TestContext.SystemPodsStartupTimeout
	if err := framework.WaitForPodsRunningReady(c, api.NamespaceSystem, int32(framework.TestContext.MinStartupPods), podStartupTimeout, framework.ImagePullerLabels); err != nil {
		framework.DumpAllNamespaceInfo(c, api.NamespaceSystem)
		framework.LogFailedContainers(c, api.NamespaceSystem, framework.Logf)
		runKubernetesServiceTestContainer(c, v1.NamespaceDefault)
		framework.Failf("Error waiting for all pods to be running and ready: %v", err)
	}

	if err := framework.WaitForPodsSuccess(c, api.NamespaceSystem, framework.ImagePullerLabels, imagePrePullingTimeout); err != nil {
		// There is no guarantee that the image pulling will succeed in 3 minutes
		// and we don't even run the image puller on all platforms (including GKE).
		// We wait for it so we get an indication of failures in the logs, and to
		// maximize benefit of image pre-pulling.
		framework.Logf("WARNING: Image pulling pods failed to enter success in %v: %v", imagePrePullingTimeout, err)
	}

	// Dump the output of the nethealth containers only once per run
	if framework.TestContext.DumpLogsOnFailure {
		framework.Logf("Dumping network health container logs from all nodes")
		framework.LogContainersInPodsWithLabels(c, api.NamespaceSystem, framework.ImagePullerLabels, "nethealth", framework.Logf)
	}

	// Reference common test to make the import valid.
	commontest.CurrentSuite = commontest.E2E

	return nil

}, func(data []byte) {
	// Run on all Ginkgo nodes

	if cloudConfig.Provider == nil {
		if err := setupProviderConfig(); err != nil {
			framework.Failf("Failed to setup provider config: %v", err)
		}
	}
})

type CleanupActionHandle *int

var cleanupActionsLock sync.Mutex
var cleanupActions = map[CleanupActionHandle]func(){}

// AddCleanupAction installs a function that will be called in the event of the
// whole test being terminated.  This allows arbitrary pieces of the overall
// test to hook into SynchronizedAfterSuite().
func AddCleanupAction(fn func()) CleanupActionHandle {
	p := CleanupActionHandle(new(int))
	cleanupActionsLock.Lock()
	defer cleanupActionsLock.Unlock()
	cleanupActions[p] = fn
	return p
}

// RemoveCleanupAction removes a function that was installed by
// AddCleanupAction.
func RemoveCleanupAction(p CleanupActionHandle) {
	cleanupActionsLock.Lock()
	defer cleanupActionsLock.Unlock()
	delete(cleanupActions, p)
}

// RunCleanupActions runs all functions installed by AddCleanupAction.  It does
// not remove them (see RemoveCleanupAction) but it does run unlocked, so they
// may remove themselves.
func RunCleanupActions() {
	list := []func(){}
	func() {
		cleanupActionsLock.Lock()
		defer cleanupActionsLock.Unlock()
		for _, fn := range cleanupActions {
			list = append(list, fn)
		}
	}()
	// Run unlocked.
	for _, fn := range list {
		fn()
	}
}

// Similar to SynchornizedBeforeSuite, we want to run some operations only once (such as collecting cluster logs).
// Here, the order of functions is reversed; first, the function which runs everywhere,
// and then the function that only runs on the first Ginkgo node.
var _ = ginkgo.SynchronizedAfterSuite(func() {
	// Run on all Ginkgo nodes
	RunCleanupActions()
}, func() {
	// Run only Ginkgo on node 1
	if framework.TestContext.ReportDir != "" {
		framework.CoreDump(framework.TestContext.ReportDir)
	}
})

// TestE2E checks configuration parameters (specified through flags) and then runs
// E2E tests using the Ginkgo runner.
// If a "report directory" is specified, one or more JUnit test reports will be
// generated in this directory, and cluster logs will also be saved.
// This function is called on each Ginkgo node in parallel mode.
func RunE2ETests(t *testing.T) {
	runtimeutils.ReallyCrash = true
	logs.InitLogs()
	defer logs.FlushLogs()

	gomega.RegisterFailHandler(ginkgo.Fail)
	// Disable skipped tests unless they are explicitly requested.
	if config.GinkgoConfig.FocusString == "" && config.GinkgoConfig.SkipString == "" {
		config.GinkgoConfig.SkipString = `\[Flaky\]|\[Feature:.+\]`
	}

	// Run tests through the Ginkgo runner with output to console + JUnit for Jenkins
	var r []ginkgo.Reporter
	if framework.TestContext.ReportDir != "" {
		// TODO: we should probably only be trying to create this directory once
		// rather than once-per-Ginkgo-node.
		if err := os.MkdirAll(framework.TestContext.ReportDir, 0755); err != nil {
			glog.Errorf("Failed creating report directory: %v", err)
		} else {
			r = append(r, reporters.NewJUnitReporter(path.Join(framework.TestContext.ReportDir, fmt.Sprintf("junit_%v%02d.xml", framework.TestContext.ReportPrefix, config.GinkgoConfig.ParallelNode))))
		}
	}
	glog.Infof("Starting e2e run %q on Ginkgo node %d", framework.RunId, config.GinkgoConfig.ParallelNode)

	ginkgo.RunSpecsWithDefaultAndCustomReporters(t, "Kubernetes e2e suite", r)
}

func podFromManifest(filename string) (*v1.Pod, error) {
	var pod v1.Pod
	framework.Logf("Parsing pod from %v", filename)
	data := generated.ReadOrDie(filename)
	json, err := utilyaml.ToJSON(data)
	if err != nil {
		return nil, err
	}
	if err := runtime.DecodeInto(api.Codecs.UniversalDecoder(), json, &pod); err != nil {
		return nil, err
	}
	return &pod, nil
}

// Run a test container to try and contact the Kubernetes api-server from a pod, wait for it
// to flip to Ready, log its output and delete it.
func runKubernetesServiceTestContainer(c clientset.Interface, ns string) {
	path := "test/images/clusterapi-tester/pod.yaml"
	p, err := podFromManifest(path)
	if err != nil {
		framework.Logf("Failed to parse clusterapi-tester from manifest %v: %v", path, err)
		return
	}
	p.Namespace = ns
	if _, err := c.Core().Pods(ns).Create(p); err != nil {
		framework.Logf("Failed to create %v: %v", p.Name, err)
		return
	}
	defer func() {
		if err := c.Core().Pods(ns).Delete(p.Name, nil); err != nil {
			framework.Logf("Failed to delete pod %v: %v", p.Name, err)
		}
	}()
	timeout := 5 * time.Minute
	if err := framework.WaitForPodCondition(c, ns, p.Name, "clusterapi-tester", timeout, testutils.PodRunningReady); err != nil {
		framework.Logf("Pod %v took longer than %v to enter running/ready: %v", p.Name, timeout, err)
		return
	}
	logs, err := framework.GetPodLogs(c, ns, p.Name, p.Spec.Containers[0].Name)
	if err != nil {
		framework.Logf("Failed to retrieve logs from %v: %v", p.Name, err)
	} else {
		framework.Logf("Output of clusterapi-tester:\n%v", logs)
	}
}
