1 // Copyright (C) The Arvados Authors. All rights reserved.
3 // SPDX-License-Identifier: AGPL-3.0
14 "git.arvados.org/arvados.git/sdk/go/arvados"
15 dockertypes "github.com/docker/docker/api/types"
16 dockercontainer "github.com/docker/docker/api/types/container"
17 dockerclient "github.com/docker/docker/client"
18 "golang.org/x/net/context"
21 // Docker daemon won't let you set a limit less than ~10 MiB
22 const minDockerRAM = int64(16 * 1024 * 1024)
24 type dockerExecutor struct {
26 logf func(string, ...interface{})
27 watchdogInterval time.Duration
28 dockerclient *dockerclient.Client
34 func newDockerExecutor(containerUUID string, logf func(string, ...interface{}), watchdogInterval time.Duration) (*dockerExecutor, error) {
35 // API version 1.21 corresponds to Docker 1.9, which is
36 // currently the minimum version we want to support.
37 client, err := dockerclient.NewClient(dockerclient.DefaultDockerHost, "1.21", nil, nil)
38 if watchdogInterval < 1 {
39 watchdogInterval = time.Minute
41 return &dockerExecutor{
42 containerUUID: containerUUID,
44 watchdogInterval: watchdogInterval,
49 func (e *dockerExecutor) ImageLoaded(imageID string) bool {
50 _, _, err := e.dockerclient.ImageInspectWithRaw(context.TODO(), imageID)
54 func (e *dockerExecutor) LoadImage(filename string) error {
55 f, err := os.Open(filename)
60 resp, err := e.dockerclient.ImageLoad(context.TODO(), f, true)
62 return fmt.Errorf("While loading container image into Docker: %v", err)
64 defer resp.Body.Close()
65 buf, _ := ioutil.ReadAll(resp.Body)
66 e.logf("loaded image: response %s", buf)
70 func (e *dockerExecutor) Create(spec containerSpec) error {
71 e.logf("Creating Docker container")
72 cfg := dockercontainer.Config{
75 WorkingDir: spec.WorkingDir,
76 Volumes: map[string]struct{}{},
77 OpenStdin: spec.Stdin != nil,
78 StdinOnce: spec.Stdin != nil,
79 AttachStdin: spec.Stdin != nil,
83 if cfg.WorkingDir == "." {
86 for k, v := range spec.Env {
87 cfg.Env = append(cfg.Env, k+"="+v)
89 if spec.RAM > 0 && spec.RAM < minDockerRAM {
90 spec.RAM = minDockerRAM
92 hostCfg := dockercontainer.HostConfig{
93 LogConfig: dockercontainer.LogConfig{
96 NetworkMode: dockercontainer.NetworkMode("none"),
97 Resources: dockercontainer.Resources{
98 CgroupParent: spec.CgroupParent,
99 NanoCPUs: int64(spec.VCPUs) * 1000000000,
100 Memory: spec.RAM, // RAM
101 MemorySwap: spec.RAM, // RAM+swap
102 KernelMemory: spec.RAM, // kernel portion
105 for path, mount := range spec.BindMounts {
106 bind := mount.HostPath + ":" + path
110 hostCfg.Binds = append(hostCfg.Binds, bind)
112 if spec.EnableNetwork {
113 hostCfg.NetworkMode = dockercontainer.NetworkMode(spec.NetworkMode)
116 created, err := e.dockerclient.ContainerCreate(context.TODO(), &cfg, &hostCfg, nil, e.containerUUID)
118 return fmt.Errorf("While creating container: %v", err)
120 e.containerID = created.ID
121 return e.startIO(spec.Stdin, spec.Stdout, spec.Stderr)
124 func (e *dockerExecutor) CgroupID() string {
128 func (e *dockerExecutor) Start() error {
129 return e.dockerclient.ContainerStart(context.TODO(), e.containerID, dockertypes.ContainerStartOptions{})
132 func (e *dockerExecutor) Stop() error {
133 err := e.dockerclient.ContainerRemove(context.TODO(), e.containerID, dockertypes.ContainerRemoveOptions{Force: true})
134 if err != nil && strings.Contains(err.Error(), "No such container: "+e.containerID) {
140 // Wait for the container to terminate, capture the exit code, and
141 // wait for stdout/stderr logging to finish.
142 func (e *dockerExecutor) Wait(ctx context.Context) (int, error) {
143 ctx, cancel := context.WithCancel(ctx)
145 watchdogErr := make(chan error, 1)
147 ticker := time.NewTicker(e.watchdogInterval)
150 dctx, dcancel := context.WithDeadline(ctx, time.Now().Add(e.watchdogInterval))
151 ctr, err := e.dockerclient.ContainerInspect(dctx, e.containerID)
153 if ctx.Err() != nil {
154 // Either the container already
155 // exited, or our caller is trying to
158 } else if err != nil {
159 e.logf("Error inspecting container: %s", err)
162 } else if ctr.State == nil || !(ctr.State.Running || ctr.State.Status == "created") {
163 watchdogErr <- fmt.Errorf("Container is not running: State=%v", ctr.State)
169 waitOk, waitErr := e.dockerclient.ContainerWait(ctx, e.containerID, dockercontainer.WaitConditionNotRunning)
172 case waitBody := <-waitOk:
173 e.logf("Container exited with code: %v", waitBody.StatusCode)
174 // wait for stdout/stderr to complete
176 return int(waitBody.StatusCode), nil
178 case err := <-waitErr:
179 return -1, fmt.Errorf("container wait: %v", err)
184 case err := <-watchdogErr:
190 func (e *dockerExecutor) startIO(stdin io.Reader, stdout, stderr io.Writer) error {
191 resp, err := e.dockerclient.ContainerAttach(context.TODO(), e.containerID, dockertypes.ContainerAttachOptions{
198 return fmt.Errorf("error attaching container stdin/stdout/stderr streams: %v", err)
203 errStdin = e.handleStdin(stdin, resp.Conn, resp.CloseWrite)
206 e.doneIO = make(chan struct{})
208 e.errIO = e.handleStdoutStderr(stdout, stderr, resp.Reader)
209 if e.errIO == nil && errStdin != nil {
217 func (e *dockerExecutor) handleStdin(stdin io.Reader, conn io.Writer, closeConn func() error) error {
219 _, err := io.Copy(conn, stdin)
221 return fmt.Errorf("While writing to docker container on stdin: %v", err)
226 // Handle docker log protocol; see
227 // https://docs.docker.com/engine/reference/api/docker_remote_api_v1.15/#attach-to-a-container
228 func (e *dockerExecutor) handleStdoutStderr(stdout, stderr io.Writer, reader io.Reader) error {
229 header := make([]byte, 8)
232 _, err = io.ReadAtLeast(reader, header, 8)
239 readsize := int64(header[7]) | (int64(header[6]) << 8) | (int64(header[5]) << 16) | (int64(header[4]) << 24)
241 _, err = io.CopyN(stdout, reader, readsize)
244 _, err = io.CopyN(stderr, reader, readsize)
248 return fmt.Errorf("error copying stdout/stderr from docker: %v", err)
253 func (e *dockerExecutor) Close() {
254 e.dockerclient.ContainerRemove(context.TODO(), e.containerID, dockertypes.ContainerRemoveOptions{Force: true})
257 func (e *dockerExecutor) SetArvadoClient(containerClient *arvados.Client, keepClient IKeepClient, container arvados.Container, keepMount string) {