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// Copyright 2017 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 containerd
import (
"context"
"fmt"
"net"
"sync"
"time"
containersapi "github.com/containerd/containerd/api/services/containers/v1"
tasksapi "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/errdefs"
"github.com/containerd/containerd/pkg/dialer"
ptypes "github.com/gogo/protobuf/types"
"google.golang.org/grpc"
"google.golang.org/grpc/backoff"
)
type client struct {
containerService containersapi.ContainersClient
taskService tasksapi.TasksClient
versionService versionapi.VersionClient
}
type ContainerdClient interface {
LoadContainer(ctx context.Context, id string) (*containers.Container, error)
TaskPid(ctx context.Context, id string) (uint32, error)
Version(ctx context.Context) (string, error)
}
var once sync.Once
var ctrdClient ContainerdClient = nil
const (
maxBackoffDelay = 3 * time.Second
baseBackoffDelay = 100 * time.Millisecond
connectionTimeout = 2 * time.Second
)
// Client creates a containerd client
func Client(address, namespace string) (ContainerdClient, error) {
var retErr error
once.Do(func() {
tryConn, err := net.DialTimeout("unix", address, connectionTimeout)
if err != nil {
retErr = fmt.Errorf("containerd: cannot unix dial containerd api service: %v", err)
return
}
tryConn.Close()
connParams := grpc.ConnectParams{
Backoff: backoff.DefaultConfig,
}
connParams.Backoff.BaseDelay = baseBackoffDelay
connParams.Backoff.MaxDelay = maxBackoffDelay
gopts := []grpc.DialOption{
grpc.WithInsecure(),
grpc.WithContextDialer(dialer.ContextDialer),
grpc.WithBlock(),
grpc.WithConnectParams(connParams),
}
unary, stream := newNSInterceptors(namespace)
gopts = append(gopts,
grpc.WithUnaryInterceptor(unary),
grpc.WithStreamInterceptor(stream),
)
ctx, cancel := context.WithTimeout(context.Background(), connectionTimeout)
defer cancel()
conn, err := grpc.DialContext(ctx, dialer.DialAddress(address), gopts...)
if err != nil {
retErr = err
return
}
ctrdClient = &client{
containerService: containersapi.NewContainersClient(conn),
taskService: tasksapi.NewTasksClient(conn),
versionService: versionapi.NewVersionClient(conn),
}
})
return ctrdClient, retErr
}
func (c *client) LoadContainer(ctx context.Context, id string) (*containers.Container, error) {
r, err := c.containerService.Get(ctx, &containersapi.GetContainerRequest{
ID: id,
})
if err != nil {
return nil, errdefs.FromGRPC(err)
}
return containerFromProto(r.Container), nil
}
func (c *client) TaskPid(ctx context.Context, id string) (uint32, error) {
response, err := c.taskService.Get(ctx, &tasksapi.GetRequest{
ContainerID: id,
})
if err != nil {
return 0, errdefs.FromGRPC(err)
}
return response.Process.Pid, nil
}
func (c *client) Version(ctx context.Context) (string, error) {
response, err := c.versionService.Version(ctx, &ptypes.Empty{})
if err != nil {
return "", errdefs.FromGRPC(err)
}
return response.Version, nil
}
func containerFromProto(containerpb containersapi.Container) *containers.Container {
var runtime containers.RuntimeInfo
if containerpb.Runtime != nil {
runtime = containers.RuntimeInfo{
Name: containerpb.Runtime.Name,
Options: containerpb.Runtime.Options,
}
}
return &containers.Container{
ID: containerpb.ID,
Labels: containerpb.Labels,
Image: containerpb.Image,
Runtime: runtime,
Spec: containerpb.Spec,
Snapshotter: containerpb.Snapshotter,
SnapshotKey: containerpb.SnapshotKey,
Extensions: containerpb.Extensions,
}
}
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