containerd/pkg/server/service.go

/*
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 server

import (
	"fmt"

	"github.com/containerd/containerd"
	"github.com/containerd/containerd/api/services/events/v1"
	"github.com/containerd/containerd/api/services/tasks/v1"
	versionapi "github.com/containerd/containerd/api/services/version/v1"
	"github.com/containerd/containerd/containers"
	"github.com/containerd/containerd/content"
	"github.com/containerd/containerd/images"
	diffservice "github.com/containerd/containerd/services/diff"
	"github.com/containerd/containerd/snapshot"
	"github.com/golang/glog"
	"github.com/kubernetes-incubator/cri-o/pkg/ocicni"
	healthapi "google.golang.org/grpc/health/grpc_health_v1"
	"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
	"k8s.io/kubernetes/pkg/kubelet/server/streaming"

	osinterface "github.com/kubernetes-incubator/cri-containerd/pkg/os"
	"github.com/kubernetes-incubator/cri-containerd/pkg/registrar"
	"github.com/kubernetes-incubator/cri-containerd/pkg/server/agents"
	containerstore "github.com/kubernetes-incubator/cri-containerd/pkg/store/container"
	imagestore "github.com/kubernetes-incubator/cri-containerd/pkg/store/image"
	sandboxstore "github.com/kubernetes-incubator/cri-containerd/pkg/store/sandbox"
)

// k8sContainerdNamespace is the namespace we use to connect containerd.
const k8sContainerdNamespace = "k8s.io"

// CRIContainerdService is the interface implement CRI remote service server.
type CRIContainerdService interface {
	Start()
	runtime.RuntimeServiceServer
	runtime.ImageServiceServer
}

// criContainerdService implements CRIContainerdService.
type criContainerdService struct {
	// os is an interface for all required os operations.
	os osinterface.OS
	// rootDir is the directory for managing cri-containerd files.
	rootDir string
	// sandboxImage is the image to use for sandbox container.
	// TODO(random-liu): Make this configurable via flag.
	sandboxImage string
	// sandboxStore stores all resources associated with sandboxes.
	sandboxStore *sandboxstore.Store
	// sandboxNameIndex stores all sandbox names and make sure each name
	// is unique.
	sandboxNameIndex *registrar.Registrar
	// containerStore stores all resources associated with containers.
	containerStore *containerstore.Store
	// containerNameIndex stores all container names and make sure each
	// name is unique.
	containerNameIndex *registrar.Registrar
	// imageStore stores all resources associated with images.
	imageStore *imagestore.Store
	// containerService is containerd containers client.
	containerService containers.Store
	// taskService is containerd tasks client.
	taskService tasks.TasksClient
	// contentStoreService is the containerd content service client.
	contentStoreService content.Store
	// snapshotService is the containerd snapshot service client.
	snapshotService snapshot.Snapshotter
	// diffService is the containerd diff service client.
	diffService diffservice.DiffService
	// imageStoreService is the containerd service to store and track
	// image metadata.
	imageStoreService images.Store
	// eventsService is the containerd task service client
	eventService events.EventsClient
	// versionService is the containerd version service client.
	versionService versionapi.VersionClient
	// healthService is the healthcheck service of containerd grpc server.
	healthService healthapi.HealthClient
	// netPlugin is used to setup and teardown network when run/stop pod sandbox.
	netPlugin ocicni.CNIPlugin
	// agentFactory is the factory to create agent used in the cri containerd service.
	agentFactory agents.AgentFactory
	// client is an instance of the containerd client
	client *containerd.Client
	// streamServer is the streaming server serves container streaming request.
	streamServer streaming.Server
}

// NewCRIContainerdService returns a new instance of CRIContainerdService
// TODO(random-liu): Add cri-containerd server config to get rid of the long arg list.
func NewCRIContainerdService(containerdEndpoint, rootDir, networkPluginBinDir, networkPluginConfDir,
	streamAddress, streamPort string) (CRIContainerdService, error) {
	// TODO(random-liu): [P2] Recover from runtime state and checkpoint.

	client, err := containerd.New(containerdEndpoint, containerd.WithDefaultNamespace(k8sContainerdNamespace))
	if err != nil {
		return nil, fmt.Errorf("failed to initialize containerd client with endpoint %q: %v", containerdEndpoint, err)
	}

	c := &criContainerdService{
		os:                  osinterface.RealOS{},
		rootDir:             rootDir,
		sandboxImage:        defaultSandboxImage,
		sandboxStore:        sandboxstore.NewStore(),
		containerStore:      containerstore.NewStore(),
		imageStore:          imagestore.NewStore(),
		sandboxNameIndex:    registrar.NewRegistrar(),
		containerNameIndex:  registrar.NewRegistrar(),
		containerService:    client.ContainerService(),
		taskService:         client.TaskService(),
		imageStoreService:   client.ImageService(),
		eventService:        client.EventService(),
		contentStoreService: client.ContentStore(),
		// Use daemon default snapshotter.
		snapshotService: client.SnapshotService(""),
		diffService:     client.DiffService(),
		versionService:  client.VersionService(),
		healthService:   client.HealthService(),
		agentFactory:    agents.NewAgentFactory(),
		client:          client,
	}

	netPlugin, err := ocicni.InitCNI(networkPluginBinDir, networkPluginConfDir)
	if err != nil {
		return nil, fmt.Errorf("failed to initialize cni plugin: %v", err)
	}
	c.netPlugin = netPlugin

	// prepare streaming server
	c.streamServer, err = newStreamServer(c, streamAddress, streamPort)
	if err != nil {
		return nil, fmt.Errorf("failed to create stream server: %v", err)
	}

	return c, nil
}

func (c *criContainerdService) Start() {
	c.startEventMonitor()
	go func() {
		if err := c.streamServer.Start(true); err != nil {
			glog.Errorf("Failed to start streaming server: %v", err)
		}
	}()
}