Add docker backend

Makefile

@@ -12,7 +12,7 @@ endif
 
 export CGO_ENABLED=0
 
-gotty: main.go assets server/*.go webtty/*.go backend/*.go Makefile
+gotty: main.go assets server/*.go webtty/*.go backend/*/*.go Makefile
 	go build ${BUILD_OPTIONS}
 
 docker:

backend/docker/doc.go

@@ -0,0 +1,3 @@
+// Package docker provides an implementation of webtty.Slave
+// that launches a command on a running docker container.
+package docker

backend/docker/docker_exec.go

@@ -0,0 +1,136 @@
+package docker
+
+import (
+	"syscall"
+	"time"
+	"context"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/client"
+)
+
+const (
+	DefaultCloseSignal  = syscall.SIGINT
+	DefaultCloseTimeout = 10 * time.Second
+)
+
+type DockerExec struct {
+	command string
+	argv    []string
+
+	containerName string
+
+	closeTimeout time.Duration
+
+	c types.HijackedResponse
+
+	cli *client.Client
+	id string
+
+}
+
+func New(command string, argv []string, headers map[string][]string, options ...Option) (*DockerExec, error) {
+	cli, err := client.NewClientWithOpts(
+		client.FromEnv,
+		client.WithAPIVersionNegotiation(),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	cmd := make([]string, 0)
+	cmd = append(cmd, command)
+	cmd = append(cmd, argv...)
+
+	eConfig := types.ExecConfig {
+		User:         "0:0",
+		Privileged:   false,
+		Tty:          true,
+		AttachStdin:  true,
+		AttachStderr: true,
+		AttachStdout: true,
+		Detach:       false,
+		Env:          make([]string, 0),
+		// TODO WorkingDir   string   // Working directory
+		Cmd:          cmd,
+	}
+
+	eConfig.Env = append(eConfig.Env, "TERM=xterm-256color")
+
+	// Combine headers into key=value pairs to set as env vars
+	// Prefix the headers with "http_" so we don't overwrite any other env vars
+	// which potentially has the same name and to bring these closer to what
+	// a (F)CGI server would proxy to a backend service
+	// Replace hyphen with underscore and make them all upper case
+	for key, values := range headers {
+		h := "HTTP_" + strings.Replace(strings.ToUpper(key), "-", "_", -1) + "=" + strings.Join(values, ",")
+		// log.Printf("Adding header: %s", h)
+		eConfig.Env = append(eConfig.Env, h)
+	}
+
+	lcmd := &DockerExec{
+		command: command,
+		argv:    argv,
+
+		closeTimeout: DefaultCloseTimeout,
+
+		cli:       cli,
+	}
+
+	for _, option := range options {
+		option(lcmd)
+	}
+
+	ctx := context.Background()
+
+	id, err := cli.ContainerExecCreate(ctx, lcmd.containerName, eConfig)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to create exec")
+	}
+	lcmd.id = id.ID
+
+	cSize := [2]uint{}
+	hiResp, err := cli.ContainerExecAttach(ctx,id.ID,types.ExecStartCheck{Detach: false, Tty: true, ConsoleSize: &cSize})
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to attach exec")
+	}
+	lcmd.c = hiResp
+
+	return lcmd, nil
+}
+
+func (lcmd *DockerExec) Read(p []byte) (n int, err error) {
+	return lcmd.c.Reader.Read(p)
+}
+
+func (lcmd *DockerExec) Write(p []byte) (n int, err error) {
+	return lcmd.c.Conn.Write(p)
+}
+
+func (lcmd *DockerExec) Close() error {
+	lcmd.c.Close()
+	return nil
+}
+
+func (lcmd *DockerExec) WindowTitleVariables() map[string]interface{} {
+	return map[string]interface{}{
+		"command": lcmd.command,
+		"argv":    lcmd.argv,
+	}
+}
+
+func (lcmd *DockerExec) ResizeTerminal(width int, height int) error {
+	ctx := context.Background()
+	return lcmd.cli.ContainerExecResize(ctx,lcmd.id,types.ResizeOptions{Width: uint(width), Height: uint(height)})
+}
+
+func (lcmd *DockerExec) closeTimeoutC() <-chan time.Time {
+	if lcmd.closeTimeout >= 0 {
+		return time.After(lcmd.closeTimeout)
+	}
+
+	return make(chan time.Time)
+}

backend/docker/factory.go

@@ -0,0 +1,47 @@
+package docker
+
+import (
+	"time"
+
+	"github.com/sorenisanerd/gotty/server"
+)
+
+type Options struct {
+	ContainerName string `hcl:"docker_container" flagName:"docker-container" flagSName:"" flagDescribe:"Name of the container to attach" default:""`
+	CloseTimeout int `hcl:"docker_close_timeout" flagName:"docker-close-timeout" flagSName:"" flagDescribe:"Time in seconds to force kill process after client is disconnected (default: -1)" default:"-1"`
+}
+
+type Factory struct {
+	command string
+	argv    []string
+	options *Options
+	opts    []Option
+}
+
+func NewFactory(command string, argv []string, options *Options) (*Factory, error) {
+	opts := []Option{WithDockerContainer(options.ContainerName)}
+	if options.CloseTimeout >= 0 {
+		opts = append(opts, WithCloseTimeout(time.Duration(options.CloseTimeout)*time.Second))
+	}
+
+	return &Factory{
+		command: command,
+		argv:    argv,
+		options: options,
+		opts:    opts,
+	}, nil
+}
+
+func (factory *Factory) Name() string {
+	return "docker exec"
+}
+
+func (factory *Factory) New(params map[string][]string, headers map[string][]string) (server.Slave, error) {
+	argv := make([]string, len(factory.argv))
+	copy(argv, factory.argv)
+	if params["arg"] != nil && len(params["arg"]) > 0 {
+		argv = append(argv, params["arg"]...)
+	}
+
+	return New(factory.command, argv, headers, factory.opts...)
+}

backend/docker/options.go

@@ -0,0 +1,19 @@
+package docker
+
+import (
+	"time"
+)
+
+type Option func(*DockerExec)
+
+func WithDockerContainer(name string) Option {
+	return func(lcmd *DockerExec) {
+		lcmd.containerName = name
+	}
+}
+
+func WithCloseTimeout(timeout time.Duration) Option {
+	return func(lcmd *DockerExec) {
+		lcmd.closeTimeout = timeout
+	}
+}

go.mod

@@ -4,19 +4,36 @@ go 1.20
 
 require (
 	github.com/NYTimes/gziphandler v1.1.1
-	github.com/creack/pty v1.1.11
+	github.com/creack/pty v1.1.18
+	github.com/docker/docker v24.0.5+incompatible
 	github.com/fatih/structs v1.1.0
-	github.com/gorilla/websocket v1.4.2
+	github.com/ghthor/gotty/v2 v2.3.2
+	github.com/gorilla/websocket v1.5.0
 	github.com/pkg/errors v0.9.1
 	github.com/urfave/cli/v2 v2.3.0
 	github.com/yudai/hcl v0.0.0-20151013225006-5fa2393b3552
 )
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
-	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/elazarl/go-bindata-assetfs v1.0.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
-	github.com/russross/blackfriday/v2 v2.0.1 // indirect
-	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
-	golang.org/x/sys v0.1.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.2 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	golang.org/x/mod v0.8.0 // indirect
+	golang.org/x/net v0.6.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.6.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+	gotest.tools/v3 v3.5.0 // indirect
 )

go.sum

@@ -1,36 +1,106 @@
+github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow=
+github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM=
 github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I=
 github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/creack/pty v1.1.11 h1:07n33Z8lZxZ2qwegKbObQohDhXDQxiMMz1NOUGYlesw=
-github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
+github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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+github.com/docker/distribution v2.8.2+incompatible h1:T3de5rq0dB1j30rp0sA2rER+m322EBzniBPB6ZIzuh8=
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+github.com/docker/docker v24.0.5+incompatible h1:WmgcE4fxyI6EEXxBRxsHnZXrO1pQ3smi0k/jho4HLeY=
+github.com/docker/docker v24.0.5+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
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+github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
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+github.com/elazarl/go-bindata-assetfs v1.0.1 h1:m0kkaHRKEu7tUIUFVwhGGGYClXvyl4RE03qmvRTNfbw=
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-github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
-github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/ghthor/gotty/v2 v2.3.2 h1:TibLmwndz5nrgxJ+bo+poVkzJPDaElrpIn/DKtJqR/Y=
+github.com/ghthor/gotty/v2 v2.3.2/go.mod h1:mQaAVrX+lc0juQOJHaDxS1ovmBvPHtaE4QMIDShlxdM=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
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+github.com/hashicorp/errwrap v1.1.0 h1:OxrOeh75EUXMY8TBjag2fzXGZ40LB6IKw45YeGUDY2I=
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-github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
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