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cmd/portforward/portforward.go
| | 1 | + | package portforward |
| | 2 | + | |
| | 3 | + | import ( |
| | 4 | + | "context" |
| | 5 | + | "fmt" |
| | 6 | + | "io" |
| | 7 | + | |
| | 8 | + | "github.com/docker/docker/api/types" |
| | 9 | + | "github.com/docker/docker/api/types/container" |
| | 10 | + | dockerclient "github.com/docker/docker/client" |
| | 11 | + | "github.com/docker/go-connections/nat" |
| | 12 | + | "github.com/spf13/cobra" |
| | 13 | + | |
| | 14 | + | "github.com/iximiuz/cdebug/pkg/cmd" |
| | 15 | + | "github.com/iximiuz/cdebug/pkg/util" |
| | 16 | + | ) |
| | 17 | + | |
| | 18 | + | // TODO: |
| | 19 | + | // - parse ports args |
| | 20 | + | // - handle non-default network case |
| | 21 | + | // - handle exposing localhost ports |
| | 22 | + | // cdebug exec --name helper --image socat <target> <target-port> <random-port> |
| | 23 | + | // cdebug port-forward helper <host-port>:<random-port> |
| | 24 | + | |
| | 25 | + | const ( |
| | 26 | + | helperImage = "nixery.dev/socat:latest" |
| | 27 | + | ) |
| | 28 | + | |
| | 29 | + | type options struct { |
| | 30 | + | target string |
| | 31 | + | address string |
| | 32 | + | ports []string |
| | 33 | + | } |
| | 34 | + | |
| | 35 | + | func NewCommand(cli cmd.CLI) *cobra.Command { |
| | 36 | + | var opts options |
| | 37 | + | |
| | 38 | + | cmd := &cobra.Command{ |
| | 39 | + | Use: "port-forward [OPTIONS] CONTAINER [LOCAL_PORT:]REMOTE_PORT [...[LOCAL_PORT_N:]REMOTE_PORT_N]", |
| | 40 | + | Short: "Publish a port of an already running container (kind of)", |
| | 41 | + | Args: cobra.MinimumNArgs(2), |
| | 42 | + | RunE: func(cmd *cobra.Command, args []string) error { |
| | 43 | + | opts.target = args[0] |
| | 44 | + | if len(args) > 1 { |
| | 45 | + | opts.ports = args[1:] |
| | 46 | + | } |
| | 47 | + | return runPortForward(context.Background(), cli, &opts) |
| | 48 | + | }, |
| | 49 | + | } |
| | 50 | + | |
| | 51 | + | flags := cmd.Flags() |
| | 52 | + | flags.SetInterspersed(false) // Instead of relying on -- |
| | 53 | + | |
| | 54 | + | flags.StringVar( |
| | 55 | + | &opts.address, |
| | 56 | + | "address", |
| | 57 | + | "127.0.0.1", |
| | 58 | + | "Host's interface address to bind the port to", |
| | 59 | + | ) |
| | 60 | + | |
| | 61 | + | return cmd |
| | 62 | + | } |
| | 63 | + | |
| | 64 | + | func runPortForward(ctx context.Context, cli cmd.CLI, opts *options) error { |
| | 65 | + | client, err := dockerclient.NewClientWithOpts( |
| | 66 | + | dockerclient.FromEnv, |
| | 67 | + | dockerclient.WithAPIVersionNegotiation(), |
| | 68 | + | ) |
| | 69 | + | if err != nil { |
| | 70 | + | return fmt.Errorf("cannot initialize Docker client: %w", err) |
| | 71 | + | } |
| | 72 | + | |
| | 73 | + | target, err := client.ContainerInspect(ctx, opts.target) |
| | 74 | + | if err != nil { |
| | 75 | + | return fmt.Errorf("cannot inspect target container: %w", err) |
| | 76 | + | } |
| | 77 | + | |
| | 78 | + | if err := pullImage(ctx, cli, client, helperImage); err != nil { |
| | 79 | + | return err |
| | 80 | + | } |
| | 81 | + | |
| | 82 | + | ports, portBindings, err := nat.ParsePortSpecs([]string{"8080:80"}) |
| | 83 | + | if err != nil { |
| | 84 | + | return err |
| | 85 | + | } |
| | 86 | + | |
| | 87 | + | contIP := target.NetworkSettings.Networks["bridge"].IPAddress |
| | 88 | + | resp, err := client.ContainerCreate( |
| | 89 | + | ctx, |
| | 90 | + | &container.Config{ |
| | 91 | + | Image: helperImage, |
| | 92 | + | Entrypoint: []string{"socat"}, |
| | 93 | + | Cmd: []string{ |
| | 94 | + | "TCP-LISTEN:80,fork", |
| | 95 | + | fmt.Sprintf("TCP-CONNECT:%s:%d", contIP, 80), |
| | 96 | + | }, |
| | 97 | + | ExposedPorts: ports, |
| | 98 | + | }, |
| | 99 | + | &container.HostConfig{ |
| | 100 | + | AutoRemove: true, |
| | 101 | + | PortBindings: portBindings, |
| | 102 | + | }, |
| | 103 | + | nil, |
| | 104 | + | nil, |
| | 105 | + | "port-forwarder-"+util.ShortID(), |
| | 106 | + | ) |
| | 107 | + | if err != nil { |
| | 108 | + | return fmt.Errorf("cannot create port-forwarder container: %w", err) |
| | 109 | + | } |
| | 110 | + | |
| | 111 | + | if err := client.ContainerStart(ctx, resp.ID, types.ContainerStartOptions{}); err != nil { |
| | 112 | + | return fmt.Errorf("cannot start port-forwarder container: %w", err) |
| | 113 | + | } |
| | 114 | + | |
| | 115 | + | forwarderStatusCh, forwarderErrCh := client.ContainerWait(ctx, resp.ID, container.WaitConditionNotRunning) |
| | 116 | + | // targetStatusCh, targetErrCh := client.ContainerWait(ctx, target.ID, container.WaitConditionNotRunning) |
| | 117 | + | select { |
| | 118 | + | case err := <-forwarderErrCh: |
| | 119 | + | if err != nil { |
| | 120 | + | return fmt.Errorf("waiting port-forwarder container failed: %w", err) |
| | 121 | + | } |
| | 122 | + | case <-forwarderStatusCh: |
| | 123 | + | } |
| | 124 | + | |
| | 125 | + | return nil |
| | 126 | + | } |
| | 127 | + | |
| | 128 | + | func pullImage( |
| | 129 | + | ctx context.Context, |
| | 130 | + | cli cmd.CLI, |
| | 131 | + | client *dockerclient.Client, |
| | 132 | + | image string, |
| | 133 | + | ) error { |
| | 134 | + | resp, err := client.ImagePull(ctx, image, types.ImagePullOptions{}) |
| | 135 | + | if err != nil { |
| | 136 | + | return fmt.Errorf("cannot pull port-forwarder helper image %q: %w", image, err) |
| | 137 | + | } |
| | 138 | + | defer resp.Close() |
| | 139 | + | |
| | 140 | + | _, err = io.Copy(cli.OutputStream(), resp) |
| | 141 | + | return err |
| | 142 | + | } |
| | 143 | + | |
Ivan Velichko
committed
2 years ago
1 parent 14f7072f