mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
296 lines
7.8 KiB
Go
296 lines
7.8 KiB
Go
package client
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import (
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"bytes"
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"encoding/base64"
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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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"os"
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gosignal "os/signal"
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"strconv"
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"strings"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/docker/api"
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"github.com/docker/docker/dockerversion"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/pkg/signal"
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"github.com/docker/docker/pkg/stdcopy"
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"github.com/docker/docker/pkg/term"
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"github.com/docker/docker/registry"
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"github.com/docker/docker/utils"
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)
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var (
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ErrConnectionRefused = errors.New("Cannot connect to the Docker daemon. Is 'docker -d' running on this host?")
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)
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func (cli *DockerCli) HTTPClient() *http.Client {
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return &http.Client{Transport: cli.transport}
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}
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func (cli *DockerCli) encodeData(data interface{}) (*bytes.Buffer, error) {
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params := bytes.NewBuffer(nil)
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if data != nil {
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if env, ok := data.(engine.Env); ok {
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if err := env.Encode(params); err != nil {
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return nil, err
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}
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} else {
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buf, err := json.Marshal(data)
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if err != nil {
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return nil, err
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}
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if _, err := params.Write(buf); err != nil {
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return nil, err
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}
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}
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}
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return params, nil
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}
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func (cli *DockerCli) call(method, path string, data interface{}, passAuthInfo bool) (io.ReadCloser, int, error) {
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params, err := cli.encodeData(data)
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if err != nil {
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return nil, -1, err
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}
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req, err := http.NewRequest(method, fmt.Sprintf("/v%s%s", api.APIVERSION, path), params)
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if err != nil {
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return nil, -1, err
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}
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if passAuthInfo {
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cli.LoadConfigFile()
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// Resolve the Auth config relevant for this server
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authConfig := cli.configFile.Configs[registry.IndexServerAddress()]
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getHeaders := func(authConfig registry.AuthConfig) (map[string][]string, error) {
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buf, err := json.Marshal(authConfig)
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if err != nil {
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return nil, err
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}
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registryAuthHeader := []string{
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base64.URLEncoding.EncodeToString(buf),
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}
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return map[string][]string{"X-Registry-Auth": registryAuthHeader}, nil
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}
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if headers, err := getHeaders(authConfig); err == nil && headers != nil {
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for k, v := range headers {
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req.Header[k] = v
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}
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}
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}
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req.Header.Set("User-Agent", "Docker-Client/"+dockerversion.VERSION)
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req.URL.Host = cli.addr
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req.URL.Scheme = cli.scheme
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if data != nil {
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req.Header.Set("Content-Type", "application/json")
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} else if method == "POST" {
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req.Header.Set("Content-Type", "text/plain")
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}
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resp, err := cli.HTTPClient().Do(req)
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if err != nil {
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if strings.Contains(err.Error(), "connection refused") {
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return nil, -1, ErrConnectionRefused
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}
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if cli.tlsConfig == nil {
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return nil, -1, 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, -1, fmt.Errorf("An error occurred trying to connect: %v", err)
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}
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if resp.StatusCode < 200 || resp.StatusCode >= 400 {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, -1, err
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}
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if len(body) == 0 {
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return nil, resp.StatusCode, fmt.Errorf("Error: request returned %s for API route and version %s, check if the server supports the requested API version", http.StatusText(resp.StatusCode), req.URL)
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}
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return nil, resp.StatusCode, fmt.Errorf("Error response from daemon: %s", bytes.TrimSpace(body))
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}
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return resp.Body, resp.StatusCode, nil
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}
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func (cli *DockerCli) stream(method, path string, in io.Reader, out io.Writer, headers map[string][]string) error {
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return cli.streamHelper(method, path, true, in, out, nil, headers)
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}
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func (cli *DockerCli) streamHelper(method, path string, setRawTerminal bool, in io.Reader, stdout, stderr io.Writer, headers map[string][]string) error {
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if (method == "POST" || method == "PUT") && in == nil {
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in = bytes.NewReader([]byte{})
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}
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req, err := http.NewRequest(method, fmt.Sprintf("/v%s%s", api.APIVERSION, path), in)
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if err != nil {
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return err
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}
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req.Header.Set("User-Agent", "Docker-Client/"+dockerversion.VERSION)
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req.URL.Host = cli.addr
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req.URL.Scheme = cli.scheme
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if method == "POST" {
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req.Header.Set("Content-Type", "text/plain")
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}
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if headers != nil {
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for k, v := range headers {
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req.Header[k] = v
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}
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}
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resp, err := cli.HTTPClient().Do(req)
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if err != nil {
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if strings.Contains(err.Error(), "connection refused") {
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return fmt.Errorf("Cannot connect to the Docker daemon. Is 'docker -d' running on this host?")
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}
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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 < 200 || resp.StatusCode >= 400 {
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body, 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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if len(body) == 0 {
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return fmt.Errorf("Error :%s", http.StatusText(resp.StatusCode))
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}
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return fmt.Errorf("Error: %s", bytes.TrimSpace(body))
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}
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if api.MatchesContentType(resp.Header.Get("Content-Type"), "application/json") {
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return utils.DisplayJSONMessagesStream(resp.Body, stdout, cli.outFd, cli.isTerminalOut)
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}
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if stdout != nil || stderr != nil {
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// When TTY is ON, use regular copy
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if setRawTerminal {
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_, err = io.Copy(stdout, resp.Body)
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} else {
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_, err = stdcopy.StdCopy(stdout, stderr, resp.Body)
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}
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log.Debugf("[stream] End of stdout")
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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 (cli *DockerCli) resizeTty(id string, isExec bool) {
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height, width := cli.getTtySize()
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if height == 0 && width == 0 {
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return
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}
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v := url.Values{}
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v.Set("h", strconv.Itoa(height))
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v.Set("w", strconv.Itoa(width))
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path := ""
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if !isExec {
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path = "/containers/" + id + "/resize?"
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} else {
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path = "/exec/" + id + "/resize?"
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}
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if _, _, err := readBody(cli.call("POST", path+v.Encode(), nil, false)); err != nil {
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log.Debugf("Error resize: %s", err)
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}
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}
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func waitForExit(cli *DockerCli, containerId string) (int, error) {
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stream, _, err := cli.call("POST", "/containers/"+containerId+"/wait", nil, false)
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if err != nil {
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return -1, err
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}
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var out engine.Env
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if err := out.Decode(stream); err != nil {
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return -1, err
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}
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return out.GetInt("StatusCode"), nil
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}
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// getExitCode perform an inspect on the container. It returns
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// the running state and the exit code.
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func getExitCode(cli *DockerCli, containerId string) (bool, int, error) {
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stream, _, err := cli.call("GET", "/containers/"+containerId+"/json", nil, false)
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if err != nil {
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// If we can't connect, then the daemon probably died.
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if err != ErrConnectionRefused {
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return false, -1, err
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}
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return false, -1, nil
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}
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var result engine.Env
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if err := result.Decode(stream); err != nil {
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return false, -1, err
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}
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state := result.GetSubEnv("State")
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return state.GetBool("Running"), state.GetInt("ExitCode"), nil
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}
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// getExecExitCode perform an inspect on the exec command. It returns
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// the running state and the exit code.
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func getExecExitCode(cli *DockerCli, execId string) (bool, int, error) {
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stream, _, err := cli.call("GET", "/exec/"+execId+"/json", nil, false)
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if err != nil {
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// If we can't connect, then the daemon probably died.
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if err != ErrConnectionRefused {
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return false, -1, err
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}
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return false, -1, nil
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}
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var result engine.Env
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if err := result.Decode(stream); err != nil {
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return false, -1, err
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}
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return result.GetBool("Running"), result.GetInt("ExitCode"), nil
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}
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func (cli *DockerCli) monitorTtySize(id string, isExec bool) error {
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cli.resizeTty(id, isExec)
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sigchan := make(chan os.Signal, 1)
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gosignal.Notify(sigchan, signal.SIGWINCH)
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go func() {
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for _ = range sigchan {
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cli.resizeTty(id, isExec)
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}
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}()
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return nil
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}
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func (cli *DockerCli) getTtySize() (int, int) {
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if !cli.isTerminalOut {
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return 0, 0
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}
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ws, err := term.GetWinsize(cli.outFd)
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if err != nil {
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log.Debugf("Error getting size: %s", err)
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if ws == nil {
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return 0, 0
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}
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}
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return int(ws.Height), int(ws.Width)
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}
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func readBody(stream io.ReadCloser, statusCode int, err error) ([]byte, int, error) {
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if stream != nil {
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defer stream.Close()
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}
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if err != nil {
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return nil, statusCode, err
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}
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body, err := ioutil.ReadAll(stream)
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if err != nil {
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return nil, -1, err
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}
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return body, statusCode, nil
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}
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