github.com/containerd/nerdctl@v1.7.7/cmd/nerdctl/container_port.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"strconv"
    23  	"strings"
    24  
    25  	"github.com/containerd/nerdctl/pkg/clientutil"
    26  	"github.com/containerd/nerdctl/pkg/containerutil"
    27  	"github.com/containerd/nerdctl/pkg/idutil/containerwalker"
    28  
    29  	"github.com/spf13/cobra"
    30  )
    31  
    32  func newPortCommand() *cobra.Command {
    33  	var portCommand = &cobra.Command{
    34  		Use:               "port [flags] CONTAINER [PRIVATE_PORT[/PROTO]]",
    35  		Args:              cobra.RangeArgs(1, 2),
    36  		Short:             "List port mappings or a specific mapping for the container",
    37  		RunE:              portAction,
    38  		ValidArgsFunction: portShellComplete,
    39  		SilenceUsage:      true,
    40  		SilenceErrors:     true,
    41  	}
    42  	return portCommand
    43  }
    44  
    45  func portAction(cmd *cobra.Command, args []string) error {
    46  	globalOptions, err := processRootCmdFlags(cmd)
    47  	if err != nil {
    48  		return err
    49  	}
    50  	argPort := -1
    51  	argProto := ""
    52  	portProto := ""
    53  	if len(args) == 2 {
    54  		portProto = args[1]
    55  	}
    56  
    57  	if portProto != "" {
    58  		splitBySlash := strings.Split(portProto, "/")
    59  		var err error
    60  		argPort, err = strconv.Atoi(splitBySlash[0])
    61  		if err != nil {
    62  			return err
    63  		}
    64  		if argPort <= 0 {
    65  			return fmt.Errorf("unexpected port %d", argPort)
    66  		}
    67  		switch len(splitBySlash) {
    68  		case 1:
    69  			argProto = "tcp"
    70  		case 2:
    71  			argProto = strings.ToLower(splitBySlash[1])
    72  		default:
    73  			return fmt.Errorf("failed to parse %q", portProto)
    74  		}
    75  	}
    76  	client, ctx, cancel, err := clientutil.NewClient(cmd.Context(), globalOptions.Namespace, globalOptions.Address)
    77  	if err != nil {
    78  		return err
    79  	}
    80  	defer cancel()
    81  
    82  	walker := &containerwalker.ContainerWalker{
    83  		Client: client,
    84  		OnFound: func(ctx context.Context, found containerwalker.Found) error {
    85  			if found.MatchCount > 1 {
    86  				return fmt.Errorf("multiple IDs found with provided prefix: %s", found.Req)
    87  			}
    88  			return containerutil.PrintHostPort(ctx, cmd.OutOrStdout(), found.Container, argPort, argProto)
    89  		},
    90  	}
    91  	req := args[0]
    92  	n, err := walker.Walk(ctx, req)
    93  	if err != nil {
    94  		return err
    95  	} else if n == 0 {
    96  		return fmt.Errorf("no such container %s", req)
    97  	}
    98  	return nil
    99  }
   100  
   101  func portShellComplete(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
   102  	return shellCompleteContainerNames(cmd, nil)
   103  }