DockerCLI/cli/command/container/port.go

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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.Cli) *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.Cli, 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
}