714 lines
17 KiB
Go
714 lines
17 KiB
Go
package dockerclient
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import (
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"bytes"
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"crypto/tls"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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)
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const (
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APIVersion = "v1.15"
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)
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var (
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ErrNotFound = errors.New("Not found")
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defaultTimeout = 30 * time.Second
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)
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type DockerClient struct {
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URL *url.URL
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HTTPClient *http.Client
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TLSConfig *tls.Config
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monitorStats int32
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eventStopChan chan (struct{})
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}
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type Error struct {
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StatusCode int
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Status string
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msg string
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}
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func (e Error) Error() string {
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return fmt.Sprintf("%s: %s", e.Status, e.msg)
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}
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func NewDockerClient(daemonUrl string, tlsConfig *tls.Config) (*DockerClient, error) {
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return NewDockerClientTimeout(daemonUrl, tlsConfig, time.Duration(defaultTimeout))
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}
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func NewDockerClientTimeout(daemonUrl string, tlsConfig *tls.Config, timeout time.Duration) (*DockerClient, error) {
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u, err := url.Parse(daemonUrl)
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if err != nil {
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return nil, err
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}
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if u.Scheme == "" || u.Scheme == "tcp" {
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if tlsConfig == nil {
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u.Scheme = "http"
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} else {
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u.Scheme = "https"
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}
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}
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httpClient := newHTTPClient(u, tlsConfig, timeout)
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return &DockerClient{u, httpClient, tlsConfig, 0, nil}, nil
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}
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func (client *DockerClient) doRequest(method string, path string, body []byte, headers map[string]string) ([]byte, error) {
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b := bytes.NewBuffer(body)
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reader, err := client.doStreamRequest(method, path, b, headers)
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if err != nil {
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return nil, err
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}
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defer reader.Close()
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data, err := ioutil.ReadAll(reader)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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func (client *DockerClient) doStreamRequest(method string, path string, in io.Reader, headers map[string]string) (io.ReadCloser, error) {
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if (method == "POST" || method == "PUT") && in == nil {
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in = bytes.NewReader(nil)
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}
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req, err := http.NewRequest(method, client.URL.String()+path, in)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Content-Type", "application/json")
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if headers != nil {
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for header, value := range headers {
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req.Header.Add(header, value)
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}
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}
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resp, err := client.HTTPClient.Do(req)
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if err != nil {
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if !strings.Contains(err.Error(), "connection refused") && client.TLSConfig == nil {
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return nil, fmt.Errorf("%v. Are you trying to connect to a TLS-enabled daemon without TLS?", err)
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}
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return nil, err
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}
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if resp.StatusCode == 404 {
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return nil, ErrNotFound
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}
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if resp.StatusCode >= 400 {
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defer resp.Body.Close()
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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return nil, Error{StatusCode: resp.StatusCode, Status: resp.Status, msg: string(data)}
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}
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return resp.Body, nil
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}
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func (client *DockerClient) Info() (*Info, error) {
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uri := fmt.Sprintf("/%s/info", APIVersion)
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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ret := &Info{}
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err = json.Unmarshal(data, &ret)
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if err != nil {
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return nil, err
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}
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return ret, nil
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}
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func (client *DockerClient) ListContainers(all bool, size bool, filters string) ([]Container, error) {
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argAll := 0
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if all == true {
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argAll = 1
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}
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showSize := 0
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if size == true {
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showSize = 1
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}
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uri := fmt.Sprintf("/%s/containers/json?all=%d&size=%d", APIVersion, argAll, showSize)
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if filters != "" {
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uri += "&filters=" + filters
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}
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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ret := []Container{}
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err = json.Unmarshal(data, &ret)
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if err != nil {
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return nil, err
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}
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return ret, nil
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}
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func (client *DockerClient) InspectContainer(id string) (*ContainerInfo, error) {
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uri := fmt.Sprintf("/%s/containers/%s/json", APIVersion, id)
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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info := &ContainerInfo{}
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err = json.Unmarshal(data, info)
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if err != nil {
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return nil, err
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}
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return info, nil
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}
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func (client *DockerClient) CreateContainer(config *ContainerConfig, name string) (string, error) {
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data, err := json.Marshal(config)
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if err != nil {
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return "", err
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}
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uri := fmt.Sprintf("/%s/containers/create", APIVersion)
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if name != "" {
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v := url.Values{}
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v.Set("name", name)
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uri = fmt.Sprintf("%s?%s", uri, v.Encode())
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}
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data, err = client.doRequest("POST", uri, data, nil)
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if err != nil {
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return "", err
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}
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result := &RespContainersCreate{}
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err = json.Unmarshal(data, result)
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if err != nil {
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return "", err
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}
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return result.Id, nil
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}
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func (client *DockerClient) ContainerLogs(id string, options *LogOptions) (io.ReadCloser, error) {
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v := url.Values{}
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v.Add("follow", strconv.FormatBool(options.Follow))
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v.Add("stdout", strconv.FormatBool(options.Stdout))
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v.Add("stderr", strconv.FormatBool(options.Stderr))
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v.Add("timestamps", strconv.FormatBool(options.Timestamps))
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if options.Tail > 0 {
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v.Add("tail", strconv.FormatInt(options.Tail, 10))
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}
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uri := fmt.Sprintf("/%s/containers/%s/logs?%s", APIVersion, id, v.Encode())
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req, err := http.NewRequest("GET", client.URL.String()+uri, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Content-Type", "application/json")
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resp, err := client.HTTPClient.Do(req)
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if err != nil {
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return nil, err
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}
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return resp.Body, nil
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}
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func (client *DockerClient) ContainerChanges(id string) ([]*ContainerChanges, error) {
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uri := fmt.Sprintf("/%s/containers/%s/changes", APIVersion, id)
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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changes := []*ContainerChanges{}
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err = json.Unmarshal(data, &changes)
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if err != nil {
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return nil, err
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}
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return changes, nil
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}
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func (client *DockerClient) readJSONStream(stream io.ReadCloser, decode func(*json.Decoder) decodingResult, stopChan <-chan struct{}) <-chan decodingResult {
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resultChan := make(chan decodingResult)
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go func() {
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decodeChan := make(chan decodingResult)
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go func() {
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decoder := json.NewDecoder(stream)
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for {
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decodeResult := decode(decoder)
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decodeChan <- decodeResult
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if decodeResult.err != nil {
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close(decodeChan)
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return
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}
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}
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}()
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defer close(resultChan)
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for {
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select {
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case <-stopChan:
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stream.Close()
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for _ = range decodeChan {
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}
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return
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case decodeResult := <-decodeChan:
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resultChan <- decodeResult
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if decodeResult.err != nil {
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stream.Close()
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return
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}
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}
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}
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}()
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return resultChan
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}
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func (client *DockerClient) StartContainer(id string, config *HostConfig) error {
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data, err := json.Marshal(config)
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if err != nil {
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return err
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}
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uri := fmt.Sprintf("/%s/containers/%s/start", APIVersion, id)
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_, err = client.doRequest("POST", uri, data, nil)
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if err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) StopContainer(id string, timeout int) error {
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uri := fmt.Sprintf("/%s/containers/%s/stop?t=%d", APIVersion, id, timeout)
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_, err := client.doRequest("POST", uri, nil, nil)
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if err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) RestartContainer(id string, timeout int) error {
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uri := fmt.Sprintf("/%s/containers/%s/restart?t=%d", APIVersion, id, timeout)
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_, err := client.doRequest("POST", uri, nil, nil)
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if err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) KillContainer(id, signal string) error {
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uri := fmt.Sprintf("/%s/containers/%s/kill?signal=%s", APIVersion, id, signal)
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_, err := client.doRequest("POST", uri, nil, nil)
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if err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) Wait(id string) <-chan WaitResult {
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ch := make(chan WaitResult)
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uri := fmt.Sprintf("/%s/containers/%s/wait", APIVersion, id)
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go func() {
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data, err := client.doRequest("POST", uri, nil, nil)
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if err != nil {
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ch <- WaitResult{ExitCode: -1, Error: err}
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return
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}
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var result struct {
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StatusCode int `json:"StatusCode"`
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}
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err = json.Unmarshal(data, &result)
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ch <- WaitResult{ExitCode: result.StatusCode, Error: err}
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}()
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return ch
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}
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func (client *DockerClient) MonitorEvents(options *MonitorEventsOptions, stopChan <-chan struct{}) (<-chan EventOrError, error) {
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v := url.Values{}
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if options != nil {
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if options.Since != 0 {
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v.Add("since", strconv.Itoa(options.Since))
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}
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if options.Until != 0 {
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v.Add("until", strconv.Itoa(options.Until))
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}
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if options.Filters != nil {
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filterMap := make(map[string][]string)
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if len(options.Filters.Event) > 0 {
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filterMap["event"] = []string{options.Filters.Event}
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}
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if len(options.Filters.Image) > 0 {
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filterMap["image"] = []string{options.Filters.Image}
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}
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if len(options.Filters.Container) > 0 {
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filterMap["container"] = []string{options.Filters.Container}
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}
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if len(filterMap) > 0 {
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filterJSONBytes, err := json.Marshal(filterMap)
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if err != nil {
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return nil, err
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}
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v.Add("filters", string(filterJSONBytes))
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}
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}
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}
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uri := fmt.Sprintf("%s/%s/events?%s", client.URL.String(), APIVersion, v.Encode())
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resp, err := client.HTTPClient.Get(uri)
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if err != nil {
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return nil, err
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}
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decode := func(decoder *json.Decoder) decodingResult {
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var event Event
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if err := decoder.Decode(&event); err != nil {
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return decodingResult{err: err}
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} else {
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return decodingResult{result: event}
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}
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}
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decodingResultChan := client.readJSONStream(resp.Body, decode, stopChan)
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eventOrErrorChan := make(chan EventOrError)
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go func() {
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for decodingResult := range decodingResultChan {
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event, _ := decodingResult.result.(Event)
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eventOrErrorChan <- EventOrError{
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Event: event,
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Error: decodingResult.err,
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}
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}
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close(eventOrErrorChan)
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}()
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return eventOrErrorChan, nil
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}
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func (client *DockerClient) StartMonitorEvents(cb Callback, ec chan error, args ...interface{}) {
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client.eventStopChan = make(chan struct{})
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go func() {
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eventErrChan, err := client.MonitorEvents(nil, client.eventStopChan)
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if err != nil {
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if ec != nil {
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ec <- err
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}
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return
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}
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for e := range eventErrChan {
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if e.Error != nil {
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if ec != nil {
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ec <- err
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}
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return
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}
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cb(&e.Event, ec, args...)
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}
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}()
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}
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func (client *DockerClient) StopAllMonitorEvents() {
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close(client.eventStopChan)
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}
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func (client *DockerClient) StartMonitorStats(id string, cb StatCallback, ec chan error, args ...interface{}) {
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atomic.StoreInt32(&client.monitorStats, 1)
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go client.getStats(id, cb, ec, args...)
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}
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func (client *DockerClient) getStats(id string, cb StatCallback, ec chan error, args ...interface{}) {
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uri := fmt.Sprintf("%s/%s/containers/%s/stats", client.URL.String(), APIVersion, id)
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resp, err := client.HTTPClient.Get(uri)
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if err != nil {
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ec <- err
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return
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}
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defer resp.Body.Close()
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dec := json.NewDecoder(resp.Body)
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for atomic.LoadInt32(&client.monitorStats) > 0 {
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var stats *Stats
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if err := dec.Decode(&stats); err != nil {
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ec <- err
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return
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}
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cb(id, stats, ec, args...)
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}
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}
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func (client *DockerClient) StopAllMonitorStats() {
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atomic.StoreInt32(&client.monitorStats, 0)
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}
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func (client *DockerClient) TagImage(nameOrID string, repo string, tag string, force bool) error {
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v := url.Values{}
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v.Set("repo", repo)
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v.Set("tag", tag)
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if force {
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v.Set("force", "1")
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}
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uri := fmt.Sprintf("/%s/images/%s/tag?%s", APIVersion, nameOrID, v.Encode())
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if _, err := client.doRequest("POST", uri, nil, nil); err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) Version() (*Version, error) {
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uri := fmt.Sprintf("/%s/version", APIVersion)
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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version := &Version{}
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err = json.Unmarshal(data, version)
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if err != nil {
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return nil, err
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}
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return version, nil
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}
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func (client *DockerClient) PullImage(name string, auth *AuthConfig) error {
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v := url.Values{}
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v.Set("fromImage", name)
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uri := fmt.Sprintf("/%s/images/create?%s", APIVersion, v.Encode())
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req, err := http.NewRequest("POST", client.URL.String()+uri, nil)
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if auth != nil {
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encoded_auth, err := auth.encode()
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if err != nil {
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return err
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}
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req.Header.Add("X-Registry-Auth", encoded_auth)
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}
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resp, err := client.HTTPClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode == 404 {
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return ErrNotFound
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}
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if resp.StatusCode >= 400 {
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return err
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}
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return fmt.Errorf("%s", string(data))
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}
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var finalObj map[string]interface{}
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for decoder := json.NewDecoder(resp.Body); err == nil; err = decoder.Decode(&finalObj) {
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}
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if err != io.EOF {
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return err
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}
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if err, ok := finalObj["error"]; ok {
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return fmt.Errorf("%v", err)
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}
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return nil
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}
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func (client *DockerClient) InspectImage(id string) (*ImageInfo, error) {
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uri := fmt.Sprintf("/%s/images/%s/json", APIVersion, id)
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data, err := client.doRequest("GET", uri, nil, nil)
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if err != nil {
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return nil, err
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}
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info := &ImageInfo{}
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err = json.Unmarshal(data, info)
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if err != nil {
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return nil, err
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}
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return info, nil
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}
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func (client *DockerClient) LoadImage(reader io.Reader) error {
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data, err := ioutil.ReadAll(reader)
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if err != nil {
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return err
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}
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uri := fmt.Sprintf("/%s/images/load", APIVersion)
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_, err = client.doRequest("POST", uri, data, nil)
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if err != nil {
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return err
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}
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return nil
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}
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func (client *DockerClient) RemoveContainer(id string, force, volumes bool) error {
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argForce := 0
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argVolumes := 0
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if force == true {
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argForce = 1
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}
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if volumes == true {
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argVolumes = 1
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}
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args := fmt.Sprintf("force=%d&v=%d", argForce, argVolumes)
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uri := fmt.Sprintf("/%s/containers/%s?%s", APIVersion, id, args)
|
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_, err := client.doRequest("DELETE", uri, nil, nil)
|
|
return err
|
|
}
|
|
|
|
func (client *DockerClient) ListImages(all bool) ([]*Image, error) {
|
|
argAll := 0
|
|
if all {
|
|
argAll = 1
|
|
}
|
|
uri := fmt.Sprintf("/%s/images/json?all=%d", APIVersion, argAll)
|
|
data, err := client.doRequest("GET", uri, nil, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var images []*Image
|
|
if err := json.Unmarshal(data, &images); err != nil {
|
|
return nil, err
|
|
}
|
|
return images, nil
|
|
}
|
|
|
|
func (client *DockerClient) RemoveImage(name string) ([]*ImageDelete, error) {
|
|
uri := fmt.Sprintf("/%s/images/%s", APIVersion, name)
|
|
data, err := client.doRequest("DELETE", uri, nil, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var imageDelete []*ImageDelete
|
|
if err := json.Unmarshal(data, &imageDelete); err != nil {
|
|
return nil, err
|
|
}
|
|
return imageDelete, nil
|
|
}
|
|
|
|
func (client *DockerClient) PauseContainer(id string) error {
|
|
uri := fmt.Sprintf("/%s/containers/%s/pause", APIVersion, id)
|
|
_, err := client.doRequest("POST", uri, nil, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
func (client *DockerClient) UnpauseContainer(id string) error {
|
|
uri := fmt.Sprintf("/%s/containers/%s/unpause", APIVersion, id)
|
|
_, err := client.doRequest("POST", uri, nil, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (client *DockerClient) Exec(config *ExecConfig) (string, error) {
|
|
data, err := json.Marshal(config)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
uri := fmt.Sprintf("/containers/%s/exec", config.Container)
|
|
resp, err := client.doRequest("POST", uri, data, nil)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
var createExecResp struct {
|
|
Id string
|
|
}
|
|
if err = json.Unmarshal(resp, &createExecResp); err != nil {
|
|
return "", err
|
|
}
|
|
uri = fmt.Sprintf("/exec/%s/start", createExecResp.Id)
|
|
resp, err = client.doRequest("POST", uri, data, nil)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return createExecResp.Id, nil
|
|
}
|
|
|
|
func (client *DockerClient) RenameContainer(oldName string, newName string) error {
|
|
uri := fmt.Sprintf("/containers/%s/rename?name=%s", oldName, newName)
|
|
_, err := client.doRequest("POST", uri, nil, nil)
|
|
return err
|
|
}
|
|
|
|
func (client *DockerClient) ImportImage(source string, repository string, tag string, tar io.Reader) (io.ReadCloser, error) {
|
|
var fromSrc string
|
|
v := &url.Values{}
|
|
if source == "" {
|
|
fromSrc = "-"
|
|
} else {
|
|
fromSrc = source
|
|
}
|
|
|
|
v.Set("fromSrc", fromSrc)
|
|
v.Set("repo", repository)
|
|
if tag != "" {
|
|
v.Set("tag", tag)
|
|
}
|
|
|
|
var in io.Reader
|
|
if fromSrc == "-" {
|
|
in = tar
|
|
}
|
|
return client.doStreamRequest("POST", "/images/create?"+v.Encode(), in, nil)
|
|
}
|
|
|
|
func (client *DockerClient) BuildImage(image *BuildImage) (io.ReadCloser, error) {
|
|
v := url.Values{}
|
|
|
|
if image.DockerfileName != "" {
|
|
v.Set("dockerfile", image.DockerfileName)
|
|
}
|
|
if image.RepoName != "" {
|
|
v.Set("t", image.RepoName)
|
|
}
|
|
if image.RemoteURL != "" {
|
|
v.Set("remote", image.RemoteURL)
|
|
}
|
|
if image.NoCache {
|
|
v.Set("nocache", "1")
|
|
}
|
|
if image.Pull {
|
|
v.Set("pull", "1")
|
|
}
|
|
if image.Remove {
|
|
v.Set("rm", "1")
|
|
} else {
|
|
v.Set("rm", "0")
|
|
}
|
|
if image.ForceRemove {
|
|
v.Set("forcerm", "1")
|
|
}
|
|
if image.SuppressOutput {
|
|
v.Set("q", "1")
|
|
}
|
|
|
|
v.Set("memory", strconv.FormatInt(image.Memory, 10))
|
|
v.Set("memswap", strconv.FormatInt(image.MemorySwap, 10))
|
|
v.Set("cpushares", strconv.FormatInt(image.CpuShares, 10))
|
|
v.Set("cpuperiod", strconv.FormatInt(image.CpuPeriod, 10))
|
|
v.Set("cpuquota", strconv.FormatInt(image.CpuQuota, 10))
|
|
v.Set("cpusetcpus", image.CpuSetCpus)
|
|
v.Set("cpusetmems", image.CpuSetMems)
|
|
v.Set("cgroupparent", image.CgroupParent)
|
|
|
|
headers := make(map[string]string)
|
|
if image.Config != nil {
|
|
encoded_config, err := image.Config.encode()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
headers["X-Registry-Config"] = encoded_config
|
|
}
|
|
if image.Context != nil {
|
|
headers["Content-Type"] = "application/tar"
|
|
}
|
|
|
|
uri := fmt.Sprintf("/%s/build?%s", APIVersion, v.Encode())
|
|
return client.doStreamRequest("POST", uri, image.Context, headers)
|
|
}
|