github.com/containerd/nerdctl@v1.7.7/cmd/nerdctl/compose_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  	"fmt"
    21  	"strconv"
    22  
    23  	"github.com/containerd/nerdctl/pkg/clientutil"
    24  	"github.com/containerd/nerdctl/pkg/cmd/compose"
    25  	"github.com/containerd/nerdctl/pkg/composer"
    26  	"github.com/spf13/cobra"
    27  )
    28  
    29  func newComposePortCommand() *cobra.Command {
    30  	var composePortCommand = &cobra.Command{
    31  		Use:           "port [flags] SERVICE PRIVATE_PORT",
    32  		Short:         "Print the public port for a port binding",
    33  		Args:          cobra.ExactArgs(2),
    34  		RunE:          composePortAction,
    35  		SilenceUsage:  true,
    36  		SilenceErrors: true,
    37  	}
    38  	composePortCommand.Flags().Int("index", 1, "index of the container if the service has multiple instances.")
    39  	composePortCommand.Flags().String("protocol", "tcp", "protocol of the port (tcp|udp)")
    40  
    41  	return composePortCommand
    42  }
    43  
    44  func composePortAction(cmd *cobra.Command, args []string) error {
    45  	globalOptions, err := processRootCmdFlags(cmd)
    46  	if err != nil {
    47  		return err
    48  	}
    49  	index, err := cmd.Flags().GetInt("index")
    50  	if err != nil {
    51  		return err
    52  	}
    53  	if index < 1 {
    54  		return fmt.Errorf("index starts from 1 and should be equal or greater than 1, given index: %d", index)
    55  	}
    56  
    57  	protocol, err := cmd.Flags().GetString("protocol")
    58  	if err != nil {
    59  		return err
    60  	}
    61  	switch protocol {
    62  	case "tcp", "udp":
    63  	default:
    64  		return fmt.Errorf("unsupported protocol: %s (only tcp and udp are supported)", protocol)
    65  	}
    66  
    67  	port, err := strconv.Atoi(args[1])
    68  	if err != nil {
    69  		return err
    70  	}
    71  	if port <= 0 {
    72  		return fmt.Errorf("unexpected port: %d", port)
    73  	}
    74  
    75  	client, ctx, cancel, err := clientutil.NewClient(cmd.Context(), globalOptions.Namespace, globalOptions.Address)
    76  	if err != nil {
    77  		return err
    78  	}
    79  	defer cancel()
    80  	options, err := getComposeOptions(cmd, globalOptions.DebugFull, globalOptions.Experimental)
    81  	if err != nil {
    82  		return err
    83  	}
    84  	c, err := compose.New(client, globalOptions, options, cmd.OutOrStdout(), cmd.ErrOrStderr())
    85  	if err != nil {
    86  		return err
    87  	}
    88  
    89  	po := composer.PortOptions{
    90  		ServiceName: args[0],
    91  		Index:       index,
    92  		Port:        port,
    93  		Protocol:    protocol,
    94  	}
    95  
    96  	return c.Port(ctx, cmd.OutOrStdout(), po)
    97  }