package container import ( "fmt" "strings" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/go-connections/nat" "github.com/pkg/errors" "github.com/spf13/cobra" "golang.org/x/net/context" ) type portOptions struct { container string port string } // NewPortCommand creates a new cobra.Command for `docker port` func NewPortCommand(dockerCli *command.DockerCli) *cobra.Command { var opts portOptions cmd := &cobra.Command{ Use: "port CONTAINER [PRIVATE_PORT[/PROTO]]", Short: "List port mappings or a specific mapping for the container", Args: cli.RequiresRangeArgs(1, 2), RunE: func(cmd *cobra.Command, args []string) error { opts.container = args[0] if len(args) > 1 { opts.port = args[1] } return runPort(dockerCli, &opts) }, } return cmd } func runPort(dockerCli *command.DockerCli, opts *portOptions) error { ctx := context.Background() c, err := dockerCli.Client().ContainerInspect(ctx, opts.container) if err != nil { return err } if opts.port != "" { port := opts.port proto := "tcp" parts := strings.SplitN(port, "/", 2) if len(parts) == 2 && len(parts[1]) != 0 { port = parts[0] proto = parts[1] } natPort := port + "/" + proto newP, err := nat.NewPort(proto, port) if err != nil { return err } if frontends, exists := c.NetworkSettings.Ports[newP]; exists && frontends != nil { for _, frontend := range frontends { fmt.Fprintf(dockerCli.Out(), "%s:%s\n", frontend.HostIP, frontend.HostPort) } return nil } return errors.Errorf("Error: No public port '%s' published for %s", natPort, opts.container) } for from, frontends := range c.NetworkSettings.Ports { for _, frontend := range frontends { fmt.Fprintf(dockerCli.Out(), "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort) } } return nil }