github.com/ncdc/docker@v0.10.1-0.20160129113957-6c6729ef5b74/api/client/port.go (about)

     1  package client
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  
     7  	Cli "github.com/docker/docker/cli"
     8  	flag "github.com/docker/docker/pkg/mflag"
     9  	"github.com/docker/go-connections/nat"
    10  )
    11  
    12  // CmdPort lists port mappings for a container.
    13  // If a private port is specified, it also shows the public-facing port that is NATed to the private port.
    14  //
    15  // Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]]
    16  func (cli *DockerCli) CmdPort(args ...string) error {
    17  	cmd := Cli.Subcmd("port", []string{"CONTAINER [PRIVATE_PORT[/PROTO]]"}, Cli.DockerCommands["port"].Description, true)
    18  	cmd.Require(flag.Min, 1)
    19  
    20  	cmd.ParseFlags(args, true)
    21  
    22  	c, err := cli.client.ContainerInspect(cmd.Arg(0))
    23  	if err != nil {
    24  		return err
    25  	}
    26  
    27  	if cmd.NArg() == 2 {
    28  		var (
    29  			port  = cmd.Arg(1)
    30  			proto = "tcp"
    31  			parts = strings.SplitN(port, "/", 2)
    32  		)
    33  
    34  		if len(parts) == 2 && len(parts[1]) != 0 {
    35  			port = parts[0]
    36  			proto = parts[1]
    37  		}
    38  		natPort := port + "/" + proto
    39  		newP, err := nat.NewPort(proto, port)
    40  		if err != nil {
    41  			return err
    42  		}
    43  		if frontends, exists := c.NetworkSettings.Ports[newP]; exists && frontends != nil {
    44  			for _, frontend := range frontends {
    45  				fmt.Fprintf(cli.out, "%s:%s\n", frontend.HostIP, frontend.HostPort)
    46  			}
    47  			return nil
    48  		}
    49  		return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0))
    50  	}
    51  
    52  	for from, frontends := range c.NetworkSettings.Ports {
    53  		for _, frontend := range frontends {
    54  			fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort)
    55  		}
    56  	}
    57  
    58  	return nil
    59  }