174 lines
5.0 KiB
Go
174 lines
5.0 KiB
Go
package client
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import (
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"errors"
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"fmt"
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"io"
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"net/http"
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"os"
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"runtime"
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"github.com/docker/docker/api"
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"github.com/docker/docker/cli"
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"github.com/docker/docker/cliconfig"
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"github.com/docker/docker/dockerversion"
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"github.com/docker/docker/opts"
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"github.com/docker/docker/pkg/term"
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"github.com/docker/engine-api/client"
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"github.com/docker/go-connections/tlsconfig"
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)
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// DockerCli represents the docker command line client.
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// Instances of the client can be returned from NewDockerCli.
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type DockerCli struct {
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// initializing closure
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init func() error
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// configFile has the client configuration file
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configFile *cliconfig.ConfigFile
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// in holds the input stream and closer (io.ReadCloser) for the client.
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in io.ReadCloser
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// out holds the output stream (io.Writer) for the client.
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out io.Writer
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// err holds the error stream (io.Writer) for the client.
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err io.Writer
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// keyFile holds the key file as a string.
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keyFile string
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// inFd holds the file descriptor of the client's STDIN (if valid).
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inFd uintptr
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// outFd holds file descriptor of the client's STDOUT (if valid).
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outFd uintptr
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// isTerminalIn indicates whether the client's STDIN is a TTY
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isTerminalIn bool
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// isTerminalOut indicates whether the client's STDOUT is a TTY
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isTerminalOut bool
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// client is the http client that performs all API operations
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client client.APIClient
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}
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// Initialize calls the init function that will setup the configuration for the client
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// such as the TLS, tcp and other parameters used to run the client.
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func (cli *DockerCli) Initialize() error {
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if cli.init == nil {
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return nil
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}
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return cli.init()
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}
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// CheckTtyInput checks if we are trying to attach to a container tty
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// from a non-tty client input stream, and if so, returns an error.
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func (cli *DockerCli) CheckTtyInput(attachStdin, ttyMode bool) error {
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// In order to attach to a container tty, input stream for the client must
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// be a tty itself: redirecting or piping the client standard input is
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// incompatible with `docker run -t`, `docker exec -t` or `docker attach`.
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if ttyMode && attachStdin && !cli.isTerminalIn {
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return errors.New("cannot enable tty mode on non tty input")
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}
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return nil
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}
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// PsFormat returns the format string specified in the configuration.
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// String contains columns and format specification, for example {{ID}}\t{{Name}}.
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func (cli *DockerCli) PsFormat() string {
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return cli.configFile.PsFormat
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}
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// ImagesFormat returns the format string specified in the configuration.
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// String contains columns and format specification, for example {{ID}}\t{{Name}}.
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func (cli *DockerCli) ImagesFormat() string {
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return cli.configFile.ImagesFormat
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}
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// NewDockerCli returns a DockerCli instance with IO output and error streams set by in, out and err.
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// The key file, protocol (i.e. unix) and address are passed in as strings, along with the tls.Config. If the tls.Config
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// is set the client scheme will be set to https.
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// The client will be given a 32-second timeout (see https://github.com/docker/docker/pull/8035).
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func NewDockerCli(in io.ReadCloser, out, err io.Writer, clientFlags *cli.ClientFlags) *DockerCli {
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cli := &DockerCli{
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in: in,
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out: out,
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err: err,
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keyFile: clientFlags.Common.TrustKey,
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}
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cli.init = func() error {
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clientFlags.PostParse()
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configFile, e := cliconfig.Load(cliconfig.ConfigDir())
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if e != nil {
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fmt.Fprintf(cli.err, "WARNING: Error loading config file:%v\n", e)
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}
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cli.configFile = configFile
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host, err := getServerHost(clientFlags.Common.Hosts, clientFlags.Common.TLSOptions)
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if err != nil {
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return err
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}
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customHeaders := cli.configFile.HTTPHeaders
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if customHeaders == nil {
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customHeaders = map[string]string{}
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}
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customHeaders["User-Agent"] = "Docker-Client/" + dockerversion.Version + " (" + runtime.GOOS + ")"
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verStr := api.DefaultVersion.String()
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if tmpStr := os.Getenv("DOCKER_API_VERSION"); tmpStr != "" {
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verStr = tmpStr
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}
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clientTransport, err := newClientTransport(clientFlags.Common.TLSOptions)
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if err != nil {
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return err
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}
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client, err := client.NewClient(host, verStr, clientTransport, customHeaders)
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if err != nil {
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return err
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}
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cli.client = client
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if cli.in != nil {
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cli.inFd, cli.isTerminalIn = term.GetFdInfo(cli.in)
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}
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if cli.out != nil {
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cli.outFd, cli.isTerminalOut = term.GetFdInfo(cli.out)
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}
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return nil
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}
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return cli
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}
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func getServerHost(hosts []string, tlsOptions *tlsconfig.Options) (host string, err error) {
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switch len(hosts) {
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case 0:
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host = os.Getenv("DOCKER_HOST")
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case 1:
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host = hosts[0]
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default:
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return "", errors.New("Please specify only one -H")
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}
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defaultHost := opts.DefaultTCPHost
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if tlsOptions != nil {
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defaultHost = opts.DefaultTLSHost
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}
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host, err = opts.ParseHost(defaultHost, host)
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return
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}
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func newClientTransport(tlsOptions *tlsconfig.Options) (*http.Transport, error) {
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if tlsOptions == nil {
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return &http.Transport{}, nil
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}
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config, err := tlsconfig.Client(*tlsOptions)
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if err != nil {
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return nil, err
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}
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return &http.Transport{
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TLSClientConfig: config,
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}, nil
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}
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