github.com/flavio/docker@v0.1.3-0.20170117145210-f63d1a6eec47/cli/command/container/port.go (about)

     1  package container
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  
     7  	"github.com/docker/docker/cli"
     8  	"github.com/docker/docker/cli/command"
     9  	"github.com/docker/go-connections/nat"
    10  	"github.com/spf13/cobra"
    11  	"golang.org/x/net/context"
    12  )
    13  
    14  type portOptions struct {
    15  	container string
    16  
    17  	port string
    18  }
    19  
    20  // NewPortCommand creates a new cobra.Command for `docker port`
    21  func NewPortCommand(dockerCli *command.DockerCli) *cobra.Command {
    22  	var opts portOptions
    23  
    24  	cmd := &cobra.Command{
    25  		Use:   "port CONTAINER [PRIVATE_PORT[/PROTO]]",
    26  		Short: "List port mappings or a specific mapping for the container",
    27  		Args:  cli.RequiresRangeArgs(1, 2),
    28  		RunE: func(cmd *cobra.Command, args []string) error {
    29  			opts.container = args[0]
    30  			if len(args) > 1 {
    31  				opts.port = args[1]
    32  			}
    33  			return runPort(dockerCli, &opts)
    34  		},
    35  	}
    36  	return cmd
    37  }
    38  
    39  func runPort(dockerCli *command.DockerCli, opts *portOptions) error {
    40  	ctx := context.Background()
    41  
    42  	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
    43  	if err != nil {
    44  		return err
    45  	}
    46  
    47  	if opts.port != "" {
    48  		port := opts.port
    49  		proto := "tcp"
    50  		parts := strings.SplitN(port, "/", 2)
    51  
    52  		if len(parts) == 2 && len(parts[1]) != 0 {
    53  			port = parts[0]
    54  			proto = parts[1]
    55  		}
    56  		natPort := port + "/" + proto
    57  		newP, err := nat.NewPort(proto, port)
    58  		if err != nil {
    59  			return err
    60  		}
    61  		if frontends, exists := c.NetworkSettings.Ports[newP]; exists && frontends != nil {
    62  			for _, frontend := range frontends {
    63  				fmt.Fprintf(dockerCli.Out(), "%s:%s\n", frontend.HostIP, frontend.HostPort)
    64  			}
    65  			return nil
    66  		}
    67  		return fmt.Errorf("Error: No public port '%s' published for %s", natPort, opts.container)
    68  	}
    69  
    70  	for from, frontends := range c.NetworkSettings.Ports {
    71  		for _, frontend := range frontends {
    72  			fmt.Fprintf(dockerCli.Out(), "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort)
    73  		}
    74  	}
    75  
    76  	return nil
    77  }