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moby--moby/api/client/port.go

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package client
import (
"fmt"
"strings"
Cli "github.com/docker/docker/cli"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/go-connections/nat"
)
// CmdPort lists port mappings for a container.
// If a private port is specified, it also shows the public-facing port that is NATed to the private port.
//
// Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]]
func (cli *DockerCli) CmdPort(args ...string) error {
cmd := Cli.Subcmd("port", []string{"CONTAINER [PRIVATE_PORT[/PROTO]]"}, Cli.DockerCommands["port"].Description, true)
cmd.Require(flag.Min, 1)
cmd.ParseFlags(args, true)
c, err := cli.client.ContainerInspect(cmd.Arg(0))
if err != nil {
return err
}
if cmd.NArg() == 2 {
var (
port = cmd.Arg(1)
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(cli.out, "%s:%s\n", frontend.HostIP, frontend.HostPort)
}
return nil
}
return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0))
}
for from, frontends := range c.NetworkSettings.Ports {
for _, frontend := range frontends {
fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort)
}
}
return nil
}