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Refactor

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This commit is contained in:
Iwasaki Yudai 2017-02-26 07:37:07 +09:00
parent 54403dd678
commit a6133f34b7
54 changed files with 2140 additions and 1334 deletions
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17
Godeps/Godeps.json generated
View File

@ -2,15 +2,7 @@
"ImportPath": "github.com/yudai/gotty",
"GoVersion": "go1.7",
"GodepVersion": "v79",
"Packages": [
"./..."
],
"Deps": [
{
"ImportPath": "github.com/braintree/manners",
"Comment": "0.4.0-6-g9e2a271",
"Rev": "9e2a2714de21eb092ead2ef56d8c7a60d7928819"
},
{
"ImportPath": "github.com/codegangsta/cli",
"Comment": "v1.19.1",
@ -37,6 +29,11 @@
"Comment": "release.r56-28-g5cf931e",
"Rev": "5cf931ef8f76dccd0910001d74a58a7fca84a83d"
},
{
"ImportPath": "github.com/pkg/errors",
"Comment": "v0.8.0-2-g248dadf",
"Rev": "248dadf4e9068a0b3e79f02ed0a610d935de5302"
},
{
"ImportPath": "github.com/yudai/hcl",
"Rev": "5fa2393b3552119bf33a69adb1402a1160cba23d"
@ -48,10 +45,6 @@
{
"ImportPath": "github.com/yudai/hcl/json",
"Rev": "5fa2393b3552119bf33a69adb1402a1160cba23d"
},
{
"ImportPath": "github.com/yudai/umutex",
"Rev": "18216d265c6bc72c3bb0ad9c8103d47d530b7003"
}
]
}

10
Makefile
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@ -1,14 +1,14 @@
OUTPUT_DIR = ./builds
GIT_COMMIT = `git rev-parse HEAD`
gotty: app/resource.go main.go app/*.go
gotty: server/asset.go main.go server/*.go webtty/*.go backend/*.go
godep go build
resource: app/resource.go
asset: server/asset.go
app/resource.go: bindata/static/js/hterm.js bindata/static/js/gotty.js bindata/static/index.html bindata/static/favicon.png
go-bindata -prefix bindata -pkg app -ignore=\\.gitkeep -o app/resource.go bindata/...
gofmt -w app/resource.go
server/asset.go: bindata/static/js/hterm.js bindata/static/js/gotty.js bindata/static/index.html bindata/static/favicon.png
go-bindata -prefix bindata -pkg server -ignore=\\.gitkeep -o server/asset.go bindata/...
gofmt -w server/asset.go
bindata:
mkdir bindata

433
app/app.go
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@ -1,433 +0,0 @@
package app
import (
"crypto/rand"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"errors"
"io/ioutil"
"log"
"math/big"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/yudai/gotty/backends"
"github.com/yudai/gotty/utils"
"github.com/braintree/manners"
"github.com/elazarl/go-bindata-assetfs"
"github.com/gorilla/websocket"
"github.com/yudai/umutex"
)
type InitMessage struct {
Arguments string `json:"Arguments,omitempty"`
AuthToken string `json:"AuthToken,omitempty"`
}
type App struct {
manager backends.ClientContextManager
options *Options
upgrader *websocket.Upgrader
server *manners.GracefulServer
onceMutex *umutex.UnblockingMutex
timer *time.Timer
// clientContext writes concurrently
// Use atomic operations.
connections *int64
}
type Options struct {
Address string `hcl:"address" flagName:"address" flagSName:"a" flagDescribe:"IP address to listen" default:""`
Port string `hcl:"port" flagName:"port" flagSName:"p" flagDescribe:"Port number to liten" default:"8080"`
PermitWrite bool `hcl:"permit_write" flagName:"permit-write" flagSName:"w" flagDescribe:"Permit clients to write to the TTY (BE CAREFUL)" default:"false"`
EnableBasicAuth bool `hcl:"enable_basic_auth" default:"false"`
Credential string `hcl:"credential" flagName:"credential" flagSName:"c" flagDescribe:"Credential for Basic Authentication (ex: user:pass, default disabled)" default:""`
EnableRandomUrl bool `hcl:"enable_random_url flagName:"random-url" flagSName:"r" flagDescribe:"Add a random string to the URL"" default:"false"`
RandomUrlLength int `hcl:"random_url_length" flagName:"random-url-length" flagDescribe:"Random URL length" default:"8"`
IndexFile string `hcl:"index_file" flagName:"index" flagDescribe:"Custom index.html file" default:""`
EnableTLS bool `hcl:"enable_tls" flagName:"tls" flagSName:"t" flagDescribe:"Enable TLS/SSL" default:"false"`
TLSCrtFile string `hcl:"tls_crt_file" flagName:"tls-crt" flagDescribe:"TLS/SSL certificate file path" default:"~/.gotty.crt"`
TLSKeyFile string `hcl:"tls_key_file" flagName:"tls-key" flagDescribe:"TLS/SSL key file path" default:"~/.gotty.key"`
EnableTLSClientAuth bool `hcl:"enable_tls_client_auth" default:"false"`
TLSCACrtFile string `hcl:"tls_ca_crt_file" flagName:"tls-ca-crt" flagDescribe:"TLS/SSL CA certificate file for client certifications" default:"~/.gotty.ca.crt"`
EnableReconnect bool `hcl:"enable_reconnect" flagName:"reconnect" flagDescribe:"Enable reconnection" default:"false"`
ReconnectTime int `hcl:"reconnect_time" flagName:"reconnect-time" flagDescribe:"Time to reconnect" default:"10"`
MaxConnection int `hcl:"max_connection" flagName:"max-connection" flagDescribe:"Maximum connection to gotty" default:"0"`
Once bool `hcl:"once" flagName:"once" flagDescribe:"Accept only one client and exit on disconnection" default:"false"`
Timeout int `hcl:"timeout" flagName:"timeout" flagDescribe:"Timeout seconds for waiting a client(0 to disable)" default:"0"`
PermitArguments bool `hcl:"permit_arguments" flagName:"permit-arguments" flagDescribe:"Permit clients to send command line arguments in URL (e.g. http://example.com:8080/?arg=AAA&arg=BBB)" default:"true"`
Preferences HtermPrefernces `hcl:"preferences"`
RawPreferences map[string]interface{} `hcl:"preferences"`
Width int `hcl:"width" flagName:"width" flagDescribe:"Static width of the screen, 0(default) means dynamically resize" default:"0"`
Height int `hcl:"height" flagName:"height" flagDescribe:"Static height of the screen, 0(default) means dynamically resize" default:"0"`
}
var Version = "1.0.0"
func New(manager backends.ClientContextManager, options *Options) (*App, error) {
connections := int64(0)
return &App{
manager: manager,
options: options,
upgrader: &websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
Subprotocols: []string{"gotty"},
},
onceMutex: umutex.New(),
connections: &connections,
}, nil
}
func CheckConfig(options *Options) error {
if options.EnableTLSClientAuth && !options.EnableTLS {
return errors.New("TLS client authentication is enabled, but TLS is not enabled")
}
return nil
}
func (app *App) Run() error {
if app.options.PermitWrite {
log.Printf("Permitting clients to write input to the PTY.")
}
if app.options.Once {
log.Printf("Once option is provided, accepting only one client")
}
path := ""
if app.options.EnableRandomUrl {
path += "/" + generateRandomString(app.options.RandomUrlLength)
}
endpoint := net.JoinHostPort(app.options.Address, app.options.Port)
wsHandler := http.HandlerFunc(app.handleWS)
customIndexHandler := http.HandlerFunc(app.handleCustomIndex)
authTokenHandler := http.HandlerFunc(app.handleAuthToken)
staticHandler := http.FileServer(
&assetfs.AssetFS{Asset: Asset, AssetDir: AssetDir, Prefix: "static"},
)
var siteMux = http.NewServeMux()
if app.options.IndexFile != "" {
log.Printf("Using index file at " + app.options.IndexFile)
siteMux.Handle(path+"/", customIndexHandler)
} else {
siteMux.Handle(path+"/", http.StripPrefix(path+"/", staticHandler))
}
siteMux.Handle(path+"/auth_token.js", authTokenHandler)
siteMux.Handle(path+"/js/", http.StripPrefix(path+"/", staticHandler))
siteMux.Handle(path+"/favicon.png", http.StripPrefix(path+"/", staticHandler))
siteHandler := http.Handler(siteMux)
if app.options.EnableBasicAuth {
log.Printf("Using Basic Authentication")
siteHandler = wrapBasicAuth(siteHandler, app.options.Credential)
}
siteHandler = wrapHeaders(siteHandler)
wsMux := http.NewServeMux()
wsMux.Handle("/", siteHandler)
wsMux.Handle(path+"/ws", wsHandler)
siteHandler = (http.Handler(wsMux))
siteHandler = wrapLogger(siteHandler)
scheme := "http"
if app.options.EnableTLS {
scheme = "https"
}
if app.options.Address != "" {
log.Printf(
"URL: %s",
(&url.URL{Scheme: scheme, Host: endpoint, Path: path + "/"}).String(),
)
} else {
for _, address := range listAddresses() {
log.Printf(
"URL: %s",
(&url.URL{
Scheme: scheme,
Host: net.JoinHostPort(address, app.options.Port),
Path: path + "/",
}).String(),
)
}
}
server, err := app.makeServer(endpoint, &siteHandler)
if err != nil {
return errors.New("Failed to build server: " + err.Error())
}
app.server = manners.NewWithServer(
server,
)
if app.options.Timeout > 0 {
app.timer = time.NewTimer(time.Duration(app.options.Timeout) * time.Second)
go func() {
<-app.timer.C
app.Exit()
}()
}
if app.options.EnableTLS {
crtFile := utils.ExpandHomeDir(app.options.TLSCrtFile)
keyFile := utils.ExpandHomeDir(app.options.TLSKeyFile)
log.Printf("TLS crt file: " + crtFile)
log.Printf("TLS key file: " + keyFile)
err = app.server.ListenAndServeTLS(crtFile, keyFile)
} else {
err = app.server.ListenAndServe()
}
if err != nil {
return err
}
log.Printf("Exiting...")
return nil
}
func (app *App) makeServer(addr string, handler *http.Handler) (*http.Server, error) {
server := &http.Server{
Addr: addr,
Handler: *handler,
}
if app.options.EnableTLSClientAuth {
caFile := utils.ExpandHomeDir(app.options.TLSCACrtFile)
log.Printf("CA file: " + caFile)
caCert, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, errors.New("Could not open CA crt file " + caFile)
}
caCertPool := x509.NewCertPool()
if !caCertPool.AppendCertsFromPEM(caCert) {
return nil, errors.New("Could not parse CA crt file data in " + caFile)
}
tlsConfig := &tls.Config{
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
}
server.TLSConfig = tlsConfig
}
return server, nil
}
func (app *App) stopTimer() {
if app.options.Timeout > 0 {
app.timer.Stop()
}
}
func (app *App) restartTimer() {
if app.options.Timeout > 0 {
app.timer.Reset(time.Duration(app.options.Timeout) * time.Second)
}
}
func (app *App) handleWS(w http.ResponseWriter, r *http.Request) {
app.stopTimer()
connections := atomic.AddInt64(app.connections, 1)
defer func() {
connections := atomic.AddInt64(app.connections, -1)
if app.options.MaxConnection != 0 {
log.Printf("Connection closed: %s, connections: %d/%d",
r.RemoteAddr, connections, app.options.MaxConnection)
} else {
log.Printf("Connection closed: %s, connections: %d",
r.RemoteAddr, connections)
}
if connections == 0 {
app.restartTimer()
}
}()
if int64(app.options.MaxConnection) != 0 {
if connections > int64(app.options.MaxConnection) {
log.Printf("Reached max connection: %d", app.options.MaxConnection)
return
}
}
log.Printf("New client connected: %s", r.RemoteAddr)
if r.Method != "GET" {
http.Error(w, "Method not allowed", 405)
return
}
conn, err := app.upgrader.Upgrade(w, r, nil)
if err != nil {
log.Print("Failed to upgrade connection: " + err.Error())
return
}
defer conn.Close()
_, stream, err := conn.ReadMessage()
if err != nil {
log.Print("Failed to authenticate websocket connection")
return
}
var init InitMessage
err = json.Unmarshal(stream, &init)
if err != nil {
log.Printf("Failed to parse init message %v", err)
return
}
if init.AuthToken != app.options.Credential {
log.Print("Failed to authenticate websocket connection")
return
}
var queryPath string
if app.options.PermitArguments && init.Arguments != "" {
queryPath = init.Arguments
} else {
queryPath = "?"
}
query, err := url.Parse(queryPath)
if err != nil {
log.Print("Failed to parse arguments")
return
}
params := query.Query()
ctx, err := app.manager.New(params)
if err != nil {
log.Printf("Failed to new client context %v", err)
return
}
app.server.StartRoutine()
defer app.server.FinishRoutine()
if app.options.Once {
if app.onceMutex.TryLock() { // no unlock required, it will die soon
log.Printf("Last client accepted, closing the listener.")
app.server.Close()
} else {
log.Printf("Server is already closing.")
conn.Close()
return
}
}
context := &clientContext{app: app, connection: conn, writeMutex: &sync.Mutex{}, ClientContext: ctx}
context.goHandleClient()
}
func (app *App) handleCustomIndex(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, utils.ExpandHomeDir(app.options.IndexFile))
}
func (app *App) handleAuthToken(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/javascript")
w.Write([]byte("var gotty_auth_token = '" + app.options.Credential + "';"))
}
func (app *App) Exit() (firstCall bool) {
if app.server != nil {
firstCall = app.server.Close()
if firstCall {
log.Printf("Received Exit command, waiting for all clients to close sessions...")
}
return firstCall
}
return true
}
func wrapLogger(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rw := &responseWrapper{w, 200}
handler.ServeHTTP(rw, r)
log.Printf("%s %d %s %s", r.RemoteAddr, rw.status, r.Method, r.URL.Path)
})
}
func wrapHeaders(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Server", "GoTTY/"+Version)
handler.ServeHTTP(w, r)
})
}
func wrapBasicAuth(handler http.Handler, credential string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
if len(token) != 2 || strings.ToLower(token[0]) != "basic" {
w.Header().Set("WWW-Authenticate", `Basic realm="GoTTY"`)
http.Error(w, "Bad Request", http.StatusUnauthorized)
return
}
payload, err := base64.StdEncoding.DecodeString(token[1])
if err != nil {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
return
}
if credential != string(payload) {
w.Header().Set("WWW-Authenticate", `Basic realm="GoTTY"`)
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
log.Printf("Basic Authentication Succeeded: %s", r.RemoteAddr)
handler.ServeHTTP(w, r)
})
}
func generateRandomString(length int) string {
const base = 36
size := big.NewInt(base)
n := make([]byte, length)
for i, _ := range n {
c, _ := rand.Int(rand.Reader, size)
n[i] = strconv.FormatInt(c.Int64(), base)[0]
}
return string(n)
}
func listAddresses() (addresses []string) {
ifaces, _ := net.Interfaces()
addresses = make([]string, 0, len(ifaces))
for _, iface := range ifaces {
ifAddrs, _ := iface.Addrs()
for _, ifAddr := range ifAddrs {
switch v := ifAddr.(type) {
case *net.IPNet:
addresses = append(addresses, v.IP.String())
case *net.IPAddr:
addresses = append(addresses, v.IP.String())
}
}
}
return
}

178
app/client_context.go
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@ -1,178 +0,0 @@
package app
import (
"encoding/base64"
"encoding/json"
"log"
"strings"
"sync"
"github.com/fatih/structs"
"github.com/gorilla/websocket"
"github.com/yudai/gotty/backends"
)
type clientContext struct {
backends.ClientContext
app *App
connection *websocket.Conn
writeMutex *sync.Mutex
}
const (
Input = '0'
Ping = '1'
ResizeTerminal = '2'
)
const (
Output = '0'
Pong = '1'
SetWindowTitle = '2'
SetPreferences = '3'
SetReconnect = '4'
)
type argResizeTerminal struct {
Columns float64
Rows float64
}
func (context *clientContext) goHandleClient() {
exit := make(chan bool, 3)
context.Start(exit)
go func() {
defer func() { exit <- true }()
context.processSend()
}()
go func() {
defer func() { exit <- true }()
context.processReceive()
}()
<-exit
context.TearDown()
}
func (context *clientContext) processSend() {
if err := context.sendInitialize(); err != nil {
log.Printf(err.Error())
return
}
buf := make([]byte, 1024)
for {
size, err := context.OutputReader().Read(buf)
if err != nil {
log.Printf("failed to read output from terminal backend: %v", err)
return
}
safeMessage := base64.StdEncoding.EncodeToString([]byte(buf[:size]))
if err = context.write(append([]byte{Output}, []byte(safeMessage)...)); err != nil {
log.Printf(err.Error())
return
}
}
}
func (context *clientContext) write(data []byte) error {
context.writeMutex.Lock()
defer context.writeMutex.Unlock()
return context.connection.WriteMessage(websocket.TextMessage, data)
}
func (context *clientContext) sendInitialize() error {
windowTitle, err := context.WindowTitle()
if err != nil {
return err
}
if err := context.write(append([]byte{SetWindowTitle}, []byte(windowTitle)...)); err != nil {
return err
}
prefStruct := structs.New(context.app.options.Preferences)
prefMap := prefStruct.Map()
htermPrefs := make(map[string]interface{})
for key, value := range prefMap {
rawKey := prefStruct.Field(key).Tag("hcl")
if _, ok := context.app.options.RawPreferences[rawKey]; ok {
htermPrefs[strings.Replace(rawKey, "_", "-", -1)] = value
}
}
prefs, err := json.Marshal(htermPrefs)
if err != nil {
return err
}
if err := context.write(append([]byte{SetPreferences}, prefs...)); err != nil {
return err
}
if context.app.options.EnableReconnect {
reconnect, _ := json.Marshal(context.app.options.ReconnectTime)
if err := context.write(append([]byte{SetReconnect}, reconnect...)); err != nil {
return err
}
}
return nil
}
func (context *clientContext) processReceive() {
for {
_, data, err := context.connection.ReadMessage()
if err != nil {
log.Print(err.Error())
return
}
if len(data) == 0 {
log.Print("An error has occured")
return
}
switch data[0] {
case Input:
if !context.app.options.PermitWrite {
break
}
_, err := context.InputWriter().Write(data[1:])
if err != nil {
return
}
case Ping:
if err := context.write([]byte{Pong}); err != nil {
log.Print(err.Error())
return
}
case ResizeTerminal:
var args argResizeTerminal
err = json.Unmarshal(data[1:], &args)
if err != nil {
log.Print("Malformed remote command")
return
}
rows := uint16(context.app.options.Height)
if rows == 0 {
rows = uint16(args.Rows)
}
columns := uint16(context.app.options.Width)
if columns == 0 {
columns = uint16(args.Columns)
}
err = context.ResizeTerminal(columns, rows)
if err != nil {
log.Printf("failed to resize terminal %v", err)
return
}
default:
log.Print("Unknown message type")
return
}
}
}

58
app/hterm_preferences.go
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@ -1,58 +0,0 @@
package app
type HtermPrefernces struct {
AltGrMode *string `hcl:"alt_gr_mode"`
AltBackspaceIsMetaBackspace bool `hcl:"alt_backspace_is_meta_backspace"`
AltIsMeta bool `hcl:"alt_is_meta"`
AltSendsWhat string `hcl:"alt_sends_what"`
AudibleBellSound string `hcl:"audible_bell_sound"`
DesktopNotificationBell bool `hcl:"desktop_notification_bell"`
BackgroundColor string `hcl:"background_color"`
BackgroundImage string `hcl:"background_image"`
BackgroundSize string `hcl:"background_size"`
BackgroundPosition string `hcl:"background_position"`
BackspaceSendsBackspace bool `hcl:"backspace_sends_backspace"`
CharacterMapOverrides map[string]map[string]string `hcl:"character_map_overrides"`
CloseOnExit bool `hcl:"close_on_exit"`
CursorBlink bool `hcl:"cursor_blink"`
CursorBlinkCycle [2]int `hcl:"cursor_blink_cycle"`
CursorColor string `hcl:"cursor_color"`
ColorPaletteOverrides []*string `hcl:"color_palette_overrides"`
CopyOnSelect bool `hcl:"copy_on_select"`
UseDefaultWindowCopy bool `hcl:"use_default_window_copy"`
ClearSelectionAfterCopy bool `hcl:"clear_selection_after_copy"`
CtrlPlusMinusZeroZoom bool `hcl:"ctrl_plus_minus_zero_zoom"`
CtrlCCopy bool `hcl:"ctrl_c_copy"`
CtrlVPaste bool `hcl:"ctrl_v_paste"`
EastAsianAmbiguousAsTwoColumn bool `hcl:"east_asian_ambiguous_as_two_column"`
Enable8BitControl *bool `hcl:"enable_8_bit_control"`
EnableBold *bool `hcl:"enable_bold"`
EnableBoldAsBright bool `hcl:"enable_bold_as_bright"`
EnableClipboardNotice bool `hcl:"enable_clipboard_notice"`
EnableClipboardWrite bool `hcl:"enable_clipboard_write"`
EnableDec12 bool `hcl:"enable_dec12"`
Environment map[string]string `hcl:"environment"`
FontFamily string `hcl:"font_family"`
FontSize int `hcl:"font_size"`
FontSmoothing string `hcl:"font_smoothing"`
ForegroundColor string `hcl:"foreground_color"`
HomeKeysScroll bool `hcl:"home_keys_scroll"`
Keybindings map[string]string `hcl:"keybindings"`
MaxStringSequence int `hcl:"max_string_sequence"`
MediaKeysAreFkeys bool `hcl:"media_keys_are_fkeys"`
MetaSendsEscape bool `hcl:"meta_sends_escape"`
MousePasteButton *int `hcl:"mouse_paste_button"`
PageKeysScroll bool `hcl:"page_keys_scroll"`
PassAltNumber *bool `hcl:"pass_alt_number"`
PassCtrlNumber *bool `hcl:"pass_ctrl_number"`
PassMetaNumber *bool `hcl:"pass_meta_number"`
PassMetaV bool `hcl:"pass_meta_v"`
ReceiveEncoding string `hcl:"receive_encoding"`
ScrollOnKeystroke bool `hcl:"scroll_on_keystroke"`
ScrollOnOutput bool `hcl:"scroll_on_output"`
ScrollbarVisible bool `hcl:"scrollbar_visible"`
ScrollWheelMoveMultiplier int `hcl:"scroll_wheel_move_multiplier"`
SendEncoding string `hcl:"send_encoding"`
ShiftInsertPaste bool `hcl:"shift_insert_paste"`
UserCss string `hcl:"user_css"`
}

1
backend/doc.go Normal file
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@ -0,0 +1 @@
package backend

3
backend/localcommand/doc.go Normal file
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@ -0,0 +1,3 @@
// Package localcommand provides an implementation of webtty.Slave
// that launches a local command with a PTY.
package localcommand

44
backend/localcommand/factory.go Normal file
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@ -0,0 +1,44 @@
package localcommand
import (
"syscall"
"github.com/yudai/gotty/server"
)
type Options struct {
CloseSignal int `hcl:"close_signal" flagName:"close-signal" flagSName:"" flagDescribe:"Signal sent to the command process when gotty close it (default: SIGHUP)" default:"1"`
CloseTimeout int `hcl:"close_timeout" flagName:"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
}
func NewFactory(command string, argv []string, options *Options) (*Factory, error) {
return &Factory{
command: command,
argv: argv,
options: options,
}, nil
}
func (factory *Factory) Name() string {
return "local command"
}
func (factory *Factory) New(params 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,
WithCloseSignal(syscall.Signal(factory.options.CloseSignal)),
WithCloseSignal(syscall.Signal(factory.options.CloseTimeout)),
)
}

136
backend/localcommand/local_command.go Normal file
View File

@ -0,0 +1,136 @@
package localcommand
import (
"os"
"os/exec"
"syscall"
"time"
"unsafe"
"github.com/kr/pty"
"github.com/pkg/errors"
)
const (
DefaultCloseSignal = syscall.SIGINT
DefaultCloseTimeout = 10 * time.Second
)
type LocalCommand struct {
command string
argv []string
closeSignal syscall.Signal
closeTimeout time.Duration
cmd *exec.Cmd
pty *os.File
ptyClosed chan struct{}
}
func New(command string, argv []string, options ...Option) (*LocalCommand, error) {
cmd := exec.Command(command, argv...)
pty, err := pty.Start(cmd)
if err != nil {
// todo close cmd?
return nil, errors.Wrapf(err, "failed to start command `%s`", command)
}
ptyClosed := make(chan struct{})
lcmd := &LocalCommand{
command: command,
argv: argv,
closeSignal: DefaultCloseSignal,
closeTimeout: DefaultCloseTimeout,
cmd: cmd,
pty: pty,
ptyClosed: ptyClosed,
}
for _, option := range options {
option(lcmd)
}
// When the process is closed by the user,
// close pty so that Read() on the pty breaks with an EOF.
go func() {
defer func() {
lcmd.pty.Close()
close(lcmd.ptyClosed)
}()
lcmd.cmd.Wait()
}()
return lcmd, nil
}
func (lcmd *LocalCommand) Read(p []byte) (n int, err error) {
return lcmd.pty.Read(p)
}
func (lcmd *LocalCommand) Write(p []byte) (n int, err error) {
return lcmd.pty.Write(p)
}
func (lcmd *LocalCommand) Close() error {
if lcmd.cmd != nil && lcmd.cmd.Process != nil {
lcmd.cmd.Process.Signal(lcmd.closeSignal)
}
for {
select {
case <-lcmd.ptyClosed:
return nil
case <-lcmd.closeTimeoutC():
lcmd.cmd.Process.Signal(syscall.SIGKILL)
}
}
}
func (lcmd *LocalCommand) WindowTitleVariables() map[string]interface{} {
return map[string]interface{}{
"command": lcmd.command,
"argv": lcmd.argv,
"pid": lcmd.cmd.Process.Pid,
}
}
func (lcmd *LocalCommand) ResizeTerminal(width int, height int) error {
window := struct {
row uint16
col uint16
x uint16
y uint16
}{
uint16(height),
uint16(width),
0,
0,
}
_, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
lcmd.pty.Fd(),
syscall.TIOCSWINSZ,
uintptr(unsafe.Pointer(&window)),
)
if errno != 0 {
return errno
} else {
return nil
}
}
func (lcmd *LocalCommand) GetTerminalSize() (int, int, error) {
return pty.Getsize(lcmd.pty)
}
func (lcmd *LocalCommand) closeTimeoutC() <-chan time.Time {
if lcmd.closeTimeout >= 0 {
return time.After(lcmd.closeTimeout)
}
return make(chan time.Time)
}

20
backend/localcommand/options.go Normal file
View File

@ -0,0 +1,20 @@
package localcommand
import (
"syscall"
"time"
)
type Option func(*LocalCommand)
func WithCloseSignal(signal syscall.Signal) Option {
return func(lcmd *LocalCommand) {
lcmd.closeSignal = signal
}
}
func WithCloseTimeout(timeout time.Duration) Option {
return func(lcmd *LocalCommand) {
lcmd.closeTimeout = timeout
}
}

19
backends/interface.go
View File

@ -1,19 +0,0 @@
package backends
import (
"io"
"net/url"
)
type ClientContextManager interface {
New(params url.Values) (ClientContext, error)
}
type ClientContext interface {
WindowTitle() (string, error)
Start(exitCh chan bool)
InputWriter() io.Writer
OutputReader() io.Reader
ResizeTerminal(width, height uint16) error
TearDown() error
}

BIN
backends/ptycommand/.command.go.swp
View File

Binary file not shown.

130
backends/ptycommand/command.go
View File

@ -1,130 +0,0 @@
package ptycommand
import (
"bytes"
"fmt"
"io"
"log"
"net/url"
"os"
"os/exec"
"syscall"
"text/template"
"unsafe"
"github.com/yudai/gotty/backends"
"github.com/kr/pty"
)
type Options struct {
CloseSignal int `hcl:"close_signal" flagName:"close-signal" flagSName:"" flagDescribe:"Signal sent to the command process when gotty close it (default: SIGHUP)" default:"1"`
TitleFormat string `hcl:"title_format" flagName:"title-format" flagSName:"" flagDescribe:"Title format of browser window" default:"GoTTY - {{ .Command }} ({{ .Hostname }})"`
}
type CommandClientContextManager struct {
command []string
options *Options
titleTemplate *template.Template
}
func NewCommandClientContextManager(command []string, options *Options) (*CommandClientContextManager, error) {
titleTemplate, err := template.New("title").Parse(options.TitleFormat)
if err != nil {
return nil, fmt.Errorf("Title format string syntax error: %v", options.TitleFormat)
}
return &CommandClientContextManager{command: command, options: options, titleTemplate: titleTemplate}, nil
}
type CommandClientContext struct {
cmd *exec.Cmd
pty *os.File
mgr *CommandClientContextManager
}
func (mgr *CommandClientContextManager) New(params url.Values) (backends.ClientContext, error) {
argv := mgr.command[1:]
args := params["arg"]
if len(args) != 0 {
argv = append(argv, args...)
}
cmd := exec.Command(mgr.command[0], argv...)
return &CommandClientContext{cmd: cmd, mgr: mgr}, nil
}
func (context *CommandClientContext) WindowTitle() (title string, err error) {
hostname, _ := os.Hostname()
titleVars := struct {
Command string
Pid int
Hostname string
}{
Command: context.cmd.Path,
Pid: context.cmd.Process.Pid,
Hostname: hostname,
}
titleBuffer := new(bytes.Buffer)
if err := context.mgr.titleTemplate.Execute(titleBuffer, titleVars); err != nil {
return "", err
}
return titleBuffer.String(), nil
}
func (context *CommandClientContext) Start(exitCh chan bool) {
ptyIo, err := pty.Start(context.cmd)
if err != nil {
log.Printf("failed to start command %v", err)
exitCh <- true
} else {
context.pty = ptyIo
}
}
func (context *CommandClientContext) InputWriter() io.Writer {
return context.pty
}
func (context *CommandClientContext) OutputReader() io.Reader {
return context.pty
}
func (context *CommandClientContext) ResizeTerminal(width, height uint16) error {
window := struct {
row uint16
col uint16
x uint16
y uint16
}{
height,
width,
0,
0,
}
_, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
context.pty.Fd(),
syscall.TIOCSWINSZ,
uintptr(unsafe.Pointer(&window)),
)
if errno != 0 {
return errno
} else {
return nil
}
}
func (context *CommandClientContext) TearDown() error {
context.pty.Close()
// Even if the PTY has been closed,
// Read(0 in processSend() keeps blocking and the process doen't exit
if context.cmd != nil && context.cmd.Process != nil {
context.cmd.Process.Signal(syscall.Signal(context.mgr.options.CloseSignal))
context.cmd.Wait()
}
return nil
}

94
main.go
View File

@ -1,6 +1,7 @@
package main
import (
"context"
"fmt"
"os"
"os/signal"
@ -8,24 +9,25 @@ import (
"github.com/codegangsta/cli"
"github.com/yudai/gotty/app"
"github.com/yudai/gotty/backends/ptycommand"
"github.com/yudai/gotty/backend/localcommand"
"github.com/yudai/gotty/pkg/homedir"
"github.com/yudai/gotty/server"
"github.com/yudai/gotty/utils"
)
func main() {
cmd := cli.NewApp()
cmd.Name = "gotty"
cmd.Version = app.Version
cmd.Usage = "Share your terminal as a web application"
cmd.HideHelp = true
app := cli.NewApp()
app.Name = "gotty"
app.Version = Version
app.Usage = "Share your terminal as a web application"
app.HideHelp = true
cli.AppHelpTemplate = helpTemplate
appOptions := &app.Options{}
appOptions := &server.Options{}
if err := utils.ApplyDefaultValues(appOptions); err != nil {
exit(err, 1)
}
backendOptions := &ptycommand.Options{}
backendOptions := &localcommand.Options{}
if err := utils.ApplyDefaultValues(backendOptions); err != nil {
exit(err, 1)
}
@ -35,7 +37,7 @@ func main() {
exit(err, 3)
}
cmd.Flags = append(
app.Flags = append(
cliFlags,
cli.StringFlag{
Name: "config",
@ -45,7 +47,7 @@ func main() {
},
)
cmd.Action = func(c *cli.Context) {
app.Action = func(c *cli.Context) {
if len(c.Args()) == 0 {
msg := "Error: No command given."
cli.ShowAppHelp(c)
@ -53,7 +55,7 @@ func main() {
}
configFile := c.String("config")
_, err := os.Stat(utils.ExpandHomeDir(configFile))
_, err := os.Stat(homedir.Expand(configFile))
if configFile != "~/.gotty" || !os.IsNotExist(err) {
if err := utils.ApplyConfigFile(configFile, appOptions, backendOptions); err != nil {
exit(err, 2)
@ -65,27 +67,45 @@ func main() {
appOptions.EnableBasicAuth = c.IsSet("credential")
appOptions.EnableTLSClientAuth = c.IsSet("tls-ca-crt")
if err := app.CheckConfig(appOptions); err != nil {
err = appOptions.Validate()
if err != nil {
exit(err, 6)
}
manager, err := ptycommand.NewCommandClientContextManager(c.Args(), backendOptions)
if err != nil {
exit(err, 3)
}
app, err := app.New(manager, appOptions)
args := c.Args()
factory, err := localcommand.NewFactory(args[0], args[1:], backendOptions)
if err != nil {
exit(err, 3)
}
registerSignals(app)
hostname, _ := os.Hostname()
appOptions.TitleVariables = map[string]interface{}{
"command": args[0],
"argv": args[1:],
"hostname": hostname,
}
err = app.Run()
srv, err := server.New(factory, appOptions)
if err != nil {
exit(err, 4)
exit(err, 3)
}
ctx, cancel := context.WithCancel(context.Background())
gCtx, gCancel := context.WithCancel(context.Background())
errs := make(chan error, 1)
go func() {
errs <- srv.Run(ctx, server.WithGracefullContext(gCtx))
}()
err = waitSignals(errs, cancel, gCancel)
if err != nil && err != context.Canceled {
fmt.Printf("Error: %s\n", err)
exit(err, 8)
}
cmd.Run(os.Args)
}
app.Run(os.Args)
}
func exit(err error, code int) {
@ -95,7 +115,7 @@ func exit(err error, code int) {
os.Exit(code)
}
func registerSignals(app *app.App) {
func waitSignals(errs chan error, cancel context.CancelFunc, gracefullCancel context.CancelFunc) error {
sigChan := make(chan os.Signal, 1)
signal.Notify(
sigChan,
@ -103,17 +123,25 @@ func registerSignals(app *app.App) {
syscall.SIGTERM,
)
go func() {
for {
s := <-sigChan
select {
case err := <-errs:
return err
case s := <-sigChan:
switch s {
case syscall.SIGINT, syscall.SIGTERM:
if app.Exit() {
fmt.Println("Send ^C to force exit.")
} else {
os.Exit(5)
case syscall.SIGINT:
gracefullCancel()
fmt.Println("C-C to force close")
select {
case err := <-errs:
return err
case <-sigChan:
cancel()
return <-errs
}
default:
cancel()
return <-errs
}
}
}
}()
}

4
utils/path.go → pkg/homedir/expand.go
View File

@ -1,10 +1,10 @@
package utils
package homedir
import (
"os"
)
func ExpandHomeDir(path string) string {
func Expand(path string) string {
if path[0:2] == "~/" {
return os.Getenv("HOME") + path[1:]
} else {

18
pkg/randomstring/generate.go Normal file
View File

@ -0,0 +1,18 @@
package randomstring
import (
"crypto/rand"
"math/big"
"strconv"
)
func Generate(length int) string {
const base = 36
size := big.NewInt(base)
n := make([]byte, length)
for i, _ := range n {
c, _ := rand.Int(rand.Reader, size)
n[i] = strconv.FormatInt(c.Int64(), base)[0]
}
return string(n)
}

18
resources/gotty.js
View File

@ -2,7 +2,7 @@
var httpsEnabled = window.location.protocol == "https:";
var args = window.location.search;
var url = (httpsEnabled ? 'wss://' : 'ws://') + window.location.host + window.location.pathname + 'ws';
var protocols = ["gotty"];
var protocols = ["webtty"];
var autoReconnect = -1;
var openWs = function() {
@ -26,14 +26,14 @@
var io = term.io.push();
io.onVTKeystroke = function(str) {
ws.send("0" + str);
ws.send("1" + str);
};
io.sendString = io.onVTKeystroke;
io.onTerminalResize = function(columns, rows) {
ws.send(
"2" + JSON.stringify(
"3" + JSON.stringify(
{
columns: columns,
rows: rows,
@ -51,23 +51,23 @@
ws.onmessage = function(event) {
data = event.data.slice(1);
switch(event.data[0]) {
case '0':
case '1':
term.io.writeUTF8(window.atob(data));
break;
case '1':
case '2':
// pong
break;
case '2':
case '3':
term.setWindowTitle(data);
break;
case '3':
case '4':
preferences = JSON.parse(data);
Object.keys(preferences).forEach(function(key) {
console.log("Setting " + key + ": " + preferences[key]);
term.getPrefs().set(key, preferences[key]);
});
break;
case '4':
case '5':
autoReconnect = JSON.parse(data);
console.log("Enabling reconnect: " + autoReconnect + " seconds")
break;
@ -88,7 +88,7 @@
var sendPing = function(ws) {
ws.send("1");
ws.send("2");
}
openWs();

2
resources/index.html
View File

@ -1,7 +1,7 @@
<!doctype html>
<html>
<head>
<title>GoTTY</title>
<title>{{ .title }}</title>
<style>body, #terminal {position: absolute; height: 100%; width: 100%; margin: 0px;}</style>
<link rel="icon" type="image/png" href="favicon.png">
</head>

16
app/resource.go → server/asset.go
View File

File diff suppressed because one or more lines are too long

238
server/handlers.go Normal file
View File

@ -0,0 +1,238 @@
package server
import (
"bytes"
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"net/url"
"sync/atomic"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
"github.com/yudai/gotty/webtty"
)
func (server *Server) generateHandleWS(ctx context.Context, cancel context.CancelFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if server.options.Once {
if atomic.LoadInt64(server.once) > 0 {
http.Error(w, "Server is shutting down", http.StatusServiceUnavailable)
return
}
atomic.AddInt64(server.once, 1)
}
connections := atomic.AddInt64(server.connections, 1)
server.wsWG.Add(1)
server.stopTimer()
closeReason := "unknown reason"
defer func() {
server.wsWG.Done()
connections := atomic.AddInt64(server.connections, -1)
if connections == 0 {
server.resetTimer()
}
log.Printf(
"Connection closed by %s: %s, connections: %d/%d",
closeReason, r.RemoteAddr, connections, server.options.MaxConnection,
)
if server.options.Once {
cancel()
}
}()
log.Printf("New client connected: %s", r.RemoteAddr)
if int64(server.options.MaxConnection) != 0 {
if connections > int64(server.options.MaxConnection) {
closeReason = "exceeding max number of connections"
return
}
}
if r.Method != "GET" {
http.Error(w, "Method not allowed", 405)
return
}
conn, err := server.upgrader.Upgrade(w, r, nil)
if err != nil {
http.Error(w, "Failed to upgrade connection: "+err.Error(), 500)
return
}
defer conn.Close()
err = server.processWSConn(ctx, conn)
switch err {
case ctx.Err():
closeReason = "cancelation"
case webtty.ErrSlaveClosed:
closeReason = server.factory.Name()
case webtty.ErrMasterClosed:
closeReason = "client"
default:
closeReason = fmt.Sprintf("an error: %s", err)
}
}
}
func (server *Server) processWSConn(ctx context.Context, conn *websocket.Conn) error {
typ, initLine, err := conn.ReadMessage()
if err != nil {
return errors.Wrapf(err, "failed to authenticate websocket connection")
}
if typ != websocket.TextMessage {
return errors.New("failed to authenticate websocket connection: invalid message type")
}
var init InitMessage
err = json.Unmarshal(initLine, &init)
if err != nil {
return errors.Wrapf(err, "failed to authenticate websocket connection")
}
if init.AuthToken != server.options.Credential {
return errors.New("failed to authenticate websocket connection")
}
queryPath := "?"
if server.options.PermitArguments && init.Arguments != "" {
queryPath = init.Arguments
}
query, err := url.Parse(queryPath)
if err != nil {
return errors.Wrapf(err, "failed to parse arguments")
}
params := query.Query()
var slave Slave
slave, err = server.factory.New(params)
if err != nil {
return errors.Wrapf(err, "failed to create backend")
}
defer slave.Close()
titleVars := server.titleVariables(
[]string{"server", "master", "slave"},
map[string]map[string]interface{}{
"server": server.options.TitleVariables,
"master": map[string]interface{}{
"remote_addr": conn.RemoteAddr(),
},
"slave": slave.WindowTitleVariables(),
},
)
titleBuf := new(bytes.Buffer)
err = server.titleTemplate.Execute(titleBuf, titleVars)
if err != nil {
return errors.Wrapf(err, "failed to fill window title template")
}
opts := []webtty.Option{
webtty.WithWindowTitle(titleBuf.Bytes()),
}
if server.options.PermitWrite {
opts = append(opts, webtty.WithPermitWrite())
}
if server.options.EnableReconnect {
opts = append(opts, webtty.WithReconnect(server.options.ReconnectTime))
}
if server.options.Width > 0 || server.options.Height > 0 {
width, height, err := slave.GetTerminalSize()
if err != nil {
return errors.Wrapf(err, "failed to get default terminal size")
}
if server.options.Width > 0 {
width = server.options.Width
}
if server.options.Height > 0 {
height = server.options.Height
}
err = slave.ResizeTerminal(width, height)
if err != nil {
return errors.Wrapf(err, "failed to resize terminal")
}
opts = append(opts, webtty.WithFixedSize(server.options.Width, server.options.Height))
}
if server.options.Preferences != nil {
opts = append(opts, webtty.WithMasterPreferences(server.options.Preferences))
}
tty, err := webtty.New(conn, slave, opts...)
if err != nil {
return errors.Wrapf(err, "failed to create webtty")
}
err = tty.Run(ctx)
return err
}
func (server *Server) handleIndex(w http.ResponseWriter, r *http.Request) {
titleVars := server.titleVariables(
[]string{"server", "master"},
map[string]map[string]interface{}{
"server": server.options.TitleVariables,
"master": map[string]interface{}{
"remote_addr": r.RemoteAddr,
},
},
)
titleBuf := new(bytes.Buffer)
err := server.titleTemplate.Execute(titleBuf, titleVars)
if err != nil {
http.Error(w, "Internal Server Error", 500)
return
}
indexVars := map[string]interface{}{
"title": titleBuf.String(),
}
indexBuf := new(bytes.Buffer)
err = server.indexTemplate.Execute(indexBuf, indexVars)
if err != nil {
http.Error(w, "Internal Server Error", 500)
return
}
w.Write(indexBuf.Bytes())
}
func (server *Server) handleAuthToken(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/javascript")
// @TODO hashing?
w.Write([]byte("var gotty_auth_token = '" + server.options.Credential + "';"))
}
// titleVariables merges maps in a specified order.
// varUnits are name-keyed maps, whose names will be iterated using order.
func (server *Server) titleVariables(order []string, varUnits map[string]map[string]interface{}) map[string]interface{} {
titleVars := map[string]interface{}{}
for _, name := range order {
vars, ok := varUnits[name]
if !ok {
panic("title variable name error")
}
for key, val := range vars {
titleVars[key] = val
}
}
// safe net for conflicted keys
for _, name := range order {
titleVars[name] = varUnits[name]
}
return titleVars
}

6
server/init_message.go Normal file
View File

@ -0,0 +1,6 @@
package server
type InitMessage struct {
Arguments string `json:"Arguments,omitempty"`
AuthToken string `json:"AuthToken,omitempty"`
}

8
app/http_logger.go → server/log_response_writer.go
View File

@ -1,4 +1,4 @@
package app
package server
import (
"bufio"
@ -6,17 +6,17 @@ import (
"net/http"
)
type responseWrapper struct {
type logResponseWriter struct {
http.ResponseWriter
status int
}
func (w *responseWrapper) WriteHeader(status int) {
func (w *logResponseWriter) WriteHeader(status int) {
w.status = status
w.ResponseWriter.WriteHeader(status)
}
func (w *responseWrapper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
func (w *logResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
hj, _ := w.ResponseWriter.(http.Hijacker)
w.status = http.StatusSwitchingProtocols
return hj.Hijack()

51
server/middleware.go Normal file
View File

@ -0,0 +1,51 @@
package server
import (
"encoding/base64"
"log"
"net/http"
"strings"
)
func (server *Server) wrapLogger(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rw := &logResponseWriter{w, 200}
handler.ServeHTTP(rw, r)
log.Printf("%s %d %s %s", r.RemoteAddr, rw.status, r.Method, r.URL.Path)
})
}
func (server *Server) wrapHeaders(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// todo add version
w.Header().Set("Server", "GoTTY")
handler.ServeHTTP(w, r)
})
}
func (server *Server) wrapBasicAuth(handler http.Handler, credential string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
if len(token) != 2 || strings.ToLower(token[0]) != "basic" {
w.Header().Set("WWW-Authenticate", `Basic realm="GoTTY"`)
http.Error(w, "Bad Request", http.StatusUnauthorized)
return
}
payload, err := base64.StdEncoding.DecodeString(token[1])
if err != nil {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
return
}
if credential != string(payload) {
w.Header().Set("WWW-Authenticate", `Basic realm="GoTTY"`)
http.Error(w, "authorization failed", http.StatusUnauthorized)
return
}
log.Printf("Basic Authentication Succeeded: %s", r.RemoteAddr)
handler.ServeHTTP(w, r)
})
}

97
server/options.go Normal file
View File

@ -0,0 +1,97 @@
package server
import (
"github.com/pkg/errors"
)
type Options struct {
Address string `hcl:"address" flagName:"address" flagSName:"a" flagDescribe:"IP address to listen" default:"0.0.0.0"`
Port string `hcl:"port" flagName:"port" flagSName:"p" flagDescribe:"Port number to liten" default:"8080"`
PermitWrite bool `hcl:"permit_write" flagName:"permit-write" flagSName:"w" flagDescribe:"Permit clients to write to the TTY (BE CAREFUL)" default:"false"`
EnableBasicAuth bool `hcl:"enable_basic_auth" default:"false"`
Credential string `hcl:"credential" flagName:"credential" flagSName:"c" flagDescribe:"Credential for Basic Authentication (ex: user:pass, default disabled)" default:""`
EnableRandomUrl bool `hcl:"enable_random_url" flagName:"random-url" flagSName:"r" flagDescribe:"Add a random string to the URL" default:"false"`
RandomUrlLength int `hcl:"random_url_length" flagName:"random-url-length" flagDescribe:"Random URL length" default:"8"`
EnableTLS bool `hcl:"enable_tls" flagName:"tls" flagSName:"t" flagDescribe:"Enable TLS/SSL" default:"false"`
TLSCrtFile string `hcl:"tls_crt_file" flagName:"tls-crt" flagDescribe:"TLS/SSL certificate file path" default:"~/.gotty.crt"`
TLSKeyFile string `hcl:"tls_key_file" flagName:"tls-key" flagDescribe:"TLS/SSL key file path" default:"~/.gotty.key"`
EnableTLSClientAuth bool `hcl:"enable_tls_client_auth" default:"false"`
TLSCACrtFile string `hcl:"tls_ca_crt_file" flagName:"tls-ca-crt" flagDescribe:"TLS/SSL CA certificate file for client certifications" default:"~/.gotty.ca.crt"`
IndexFile string `hcl:"index_file" flagName:"index" flagDescribe:"Custom index.html file" default:""`
TitleFormat string `hcl:"title_format" flagName:"title-format" flagSName:"" flagDescribe:"Title format of browser window" default:"{{ .command }}@{{ .hostname }}"`
EnableReconnect bool `hcl:"enable_reconnect" flagName:"reconnect" flagDescribe:"Enable reconnection" default:"false"`
ReconnectTime int `hcl:"reconnect_time" flagName:"reconnect-time" flagDescribe:"Time to reconnect" default:"10"`
MaxConnection int `hcl:"max_connection" flagName:"max-connection" flagDescribe:"Maximum connection to gotty" default:"0"`
Once bool `hcl:"once" flagName:"once" flagDescribe:"Accept only one client and exit on disconnection" default:"false"`
Timeout int `hcl:"timeout" flagName:"timeout" flagDescribe:"Timeout seconds for waiting a client(0 to disable)" default:"0"`
PermitArguments bool `hcl:"permit_arguments" flagName:"permit-arguments" flagDescribe:"Permit clients to send command line arguments in URL (e.g. http://example.com:8080/?arg=AAA&arg=BBB)" default:"true"`
Preferences *HtermPrefernces `hcl:"preferences"`
Width int `hcl:"width" flagName:"width" flagDescribe:"Static width of the screen, 0(default) means dynamically resize" default:"0"`
Height int `hcl:"height" flagName:"height" flagDescribe:"Static height of the screen, 0(default) means dynamically resize" default:"0"`
TitleVariables map[string]interface{}
}
func (options *Options) Validate() error {
if options.EnableTLSClientAuth && !options.EnableTLS {
return errors.New("TLS client authentication is enabled, but TLS is not enabled")
}
return nil
}
type HtermPrefernces struct {
AltGrMode *string `hcl:"alt_gr_mode" json:"alt-gr-mode,omitempty"`
AltBackspaceIsMetaBackspace bool `hcl:"alt_backspace_is_meta_backspace" json:"alt-backspace-is-meta-backspace,omitempty"`
AltIsMeta bool `hcl:"alt_is_meta" json:"alt-is-meta,omitempty"`
AltSendsWhat string `hcl:"alt_sends_what" json:"alt-sends-what,omitempty"`
AudibleBellSound string `hcl:"audible_bell_sound" json:"audible-bell-sound,omitempty"`
DesktopNotificationBell bool `hcl:"desktop_notification_bell" json:"desktop-notification-bell,omitempty"`
BackgroundColor string `hcl:"background_color" json:"background-color,omitempty"`
BackgroundImage string `hcl:"background_image" json:"background-image,omitempty"`
BackgroundSize string `hcl:"background_size" json:"background-size,omitempty"`
BackgroundPosition string `hcl:"background_position" json:"background-position,omitempty"`
BackspaceSendsBackspace bool `hcl:"backspace_sends_backspace" json:"backspace-sends-backspace,omitempty"`
CharacterMapOverrides map[string]map[string]string `hcl:"character_map_overrides" json:"character-map-overrides,omitempty"`
CloseOnExit bool `hcl:"close_on_exit" json:"close-on-exit,omitempty"`
CursorBlink bool `hcl:"cursor_blink" json:"cursor-blink,omitempty"`
CursorBlinkCycle [2]int `hcl:"cursor_blink_cycle" json:"cursor-blink-cycle,omitempty"`
CursorColor string `hcl:"cursor_color" json:"cursor-color,omitempty"`
ColorPaletteOverrides []*string `hcl:"color_palette_overrides" json:"color-palette-overrides,omitempty"`
CopyOnSelect bool `hcl:"copy_on_select" json:"copy-on-select,omitempty"`
UseDefaultWindowCopy bool `hcl:"use_default_window_copy" json:"use-default-window-copy,omitempty"`
ClearSelectionAfterCopy bool `hcl:"clear_selection_after_copy" json:"clear-selection-after-copy,omitempty"`
CtrlPlusMinusZeroZoom bool `hcl:"ctrl_plus_minus_zero_zoom" json:"ctrl-plus-minus-zero-zoom,omitempty"`
CtrlCCopy bool `hcl:"ctrl_c_copy" json:"ctrl-c-copy,omitempty"`
CtrlVPaste bool `hcl:"ctrl_v_paste" json:"ctrl-v-paste,omitempty"`
EastAsianAmbiguousAsTwoColumn bool `hcl:"east_asian_ambiguous_as_two_column" json:"east-asian-ambiguous-as-two-column,omitempty"`
Enable8BitControl *bool `hcl:"enable_8_bit_control" json:"enable-8-bit-control,omitempty"`
EnableBold *bool `hcl:"enable_bold" json:"enable-bold,omitempty"`
EnableBoldAsBright bool `hcl:"enable_bold_as_bright" json:"enable-bold-as-bright,omitempty"`
EnableClipboardNotice bool `hcl:"enable_clipboard_notice" json:"enable-clipboard-notice,omitempty"`
EnableClipboardWrite bool `hcl:"enable_clipboard_write" json:"enable-clipboard-write,omitempty"`
EnableDec12 bool `hcl:"enable_dec12" json:"enable-dec12,omitempty"`
Environment map[string]string `hcl:"environment" json:"environment,omitempty"`
FontFamily string `hcl:"font_family" json:"font-family,omitempty"`
FontSize int `hcl:"font_size" json:"font-size,omitempty"`
FontSmoothing string `hcl:"font_smoothing" json:"font-smoothing,omitempty"`
ForegroundColor string `hcl:"foreground_color" json:"foreground-color,omitempty"`
HomeKeysScroll bool `hcl:"home_keys_scroll" json:"home-keys-scroll,omitempty"`
Keybindings map[string]string `hcl:"keybindings" json:"keybindings,omitempty"`
MaxStringSequence int `hcl:"max_string_sequence" json:"max-string-sequence,omitempty"`
MediaKeysAreFkeys bool `hcl:"media_keys_are_fkeys" json:"media-keys-are-fkeys,omitempty"`
MetaSendsEscape bool `hcl:"meta_sends_escape" json:"meta-sends-escape,omitempty"`
MousePasteButton *int `hcl:"mouse_paste_button" json:"mouse-paste-button,omitempty"`
PageKeysScroll bool `hcl:"page_keys_scroll" json:"page-keys-scroll,omitempty"`
PassAltNumber *bool `hcl:"pass_alt_number" json:"pass-alt-number,omitempty"`
PassCtrlNumber *bool `hcl:"pass_ctrl_number" json:"pass-ctrl-number,omitempty"`
PassMetaNumber *bool `hcl:"pass_meta_number" json:"pass-meta-number,omitempty"`
PassMetaV bool `hcl:"pass_meta_v" json:"pass-meta-v,omitempty"`
ReceiveEncoding string `hcl:"receive_encoding" json:"receive-encoding,omitempty"`
ScrollOnKeystroke bool `hcl:"scroll_on_keystroke" json:"scroll-on-keystroke,omitempty"`
ScrollOnOutput bool `hcl:"scroll_on_output" json:"scroll-on-output,omitempty"`
ScrollbarVisible bool `hcl:"scrollbar_visible" json:"scrollbar-visible,omitempty"`
ScrollWheelMoveMultiplier int `hcl:"scroll_wheel_move_multiplier" json:"scroll-wheel-move-multiplier,omitempty"`
SendEncoding string `hcl:"send_encoding" json:"send-encoding,omitempty"`
ShiftInsertPaste bool `hcl:"shift_insert_paste" json:"shift-insert-paste,omitempty"`
UserCss string `hcl:"user_css" json:"user-css,omitempty"`
}

21
server/run_option.go Normal file
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@ -0,0 +1,21 @@
package server
import (
"context"
)
// RunOptions holds a set of configurations for Server.Run().
type RunOptions struct {
gracefullCtx context.Context
}
// RunOption is an option of Server.Run().
type RunOption func(*RunOptions)
// WithGracefullContext accepts a context to shutdown a Server
// with care for existing client connections.
func WithGracefullContext(ctx context.Context) RunOption {
return func(options *RunOptions) {
options.gracefullCtx = ctx
}
}

253
server/server.go Normal file
View File

@ -0,0 +1,253 @@
package server
import (
"context"
"crypto/tls"
"crypto/x509"
"html/template"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"sync"
"sync/atomic"
noesctmpl "text/template"
"time"
"github.com/elazarl/go-bindata-assetfs"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
"github.com/yudai/gotty/pkg/homedir"
"github.com/yudai/gotty/pkg/randomstring"
"github.com/yudai/gotty/webtty"
)
// Server provides a webtty HTTP endpoint.
type Server struct {
factory Factory
options *Options
srv *http.Server
upgrader *websocket.Upgrader
indexTemplate *template.Template
titleTemplate *noesctmpl.Template
titleVars map[string]interface{}
timer *time.Timer
wsWG sync.WaitGroup
url *url.URL // use URL()
connections *int64 // Use atomic operations
once *int64 // use atomic operations
}
// New creates a new instance of Server.
// Server will use the New() of the factory provided to handle each request.
func New(factory Factory, options *Options) (*Server, error) {
indexData, err := Asset("static/index.html")
if err != nil {
panic("index not found") // must be in bindata
}
if options.IndexFile != "" {
log.Printf("Using index file at " + options.IndexFile)
path := homedir.Expand(options.IndexFile)
indexData, err = ioutil.ReadFile(path)
if err != nil {
return nil, errors.Wrapf(err, "failed to read custom index file at `%s`", path)
}
}
indexTemplate, err := template.New("index").Parse(string(indexData))
if err != nil {
panic("index template parse failed") // must be valid
}
titleTemplate, err := noesctmpl.New("title").Parse(options.TitleFormat)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse window title format `%s`", options.TitleFormat)
}
connections := int64(0)
once := int64(0)
return &Server{
factory: factory,
options: options,
upgrader: &websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
Subprotocols: webtty.Protocols,
},
indexTemplate: indexTemplate,
titleTemplate: titleTemplate,
connections: &connections,
once: &once,
}, nil
}
// Run starts the main process of the Server.
// The cancelation of ctx will shutdown the server immediately with aborting
// existing connections. Use WithGracefullContext() to support gracefull shutdown.
func (server *Server) Run(ctx context.Context, options ...RunOption) error {
cctx, cancel := context.WithCancel(ctx)
opts := &RunOptions{gracefullCtx: context.Background()}
for _, opt := range options {
opt(opts)
}
handlers := server.setupHandlers(cctx, cancel)
srv, err := server.setupHTTPServer(handlers)
if err != nil {
return errors.Wrapf(err, "failed to setup an HTTP server")
}
if server.options.PermitWrite {
log.Printf("Permitting clients to write input to the PTY.")
}
if server.options.Once {
log.Printf("Once option is provided, accepting only one client")
}
server.srv = srv
if server.options.Timeout > 0 {
server.timer = time.NewTimer(time.Duration(server.options.Timeout) * time.Second)
go func() {
select {
case <-server.timer.C:
cancel()
case <-cctx.Done():
}
}()
}
listenErr := make(chan error, 1)
go func() {
if server.options.EnableTLS {
crtFile := homedir.Expand(server.options.TLSCrtFile)
keyFile := homedir.Expand(server.options.TLSKeyFile)
log.Printf("TLS crt file: " + crtFile)
log.Printf("TLS key file: " + keyFile)
err = srv.ListenAndServeTLS(crtFile, keyFile)
} else {
err = srv.ListenAndServe()
}
if err != nil {
listenErr <- err
}
}()
go func() {
select {
case <-opts.gracefullCtx.Done():
srv.Shutdown(context.Background())
case <-cctx.Done():
}
}()
select {
case err = <-listenErr:
if err == http.ErrServerClosed { // by gracefull ctx
err = nil
} else {
cancel()
}
case <-cctx.Done():
srv.Close()
err = cctx.Err()
}
conn := atomic.LoadInt64(server.connections)
if conn > 0 {
log.Printf("Waiting for %d connections to be closed", conn)
}
server.wsWG.Wait()
return err
}
func (server *Server) setupHandlers(ctx context.Context, cancel context.CancelFunc) http.Handler {
staticFileHandler := http.FileServer(
&assetfs.AssetFS{Asset: Asset, AssetDir: AssetDir, Prefix: "static"},
)
url := server.URL()
var siteMux = http.NewServeMux()
siteMux.HandleFunc(url.Path, server.handleIndex)
siteMux.Handle(url.Path+"js/", http.StripPrefix(url.Path, staticFileHandler))
siteMux.Handle(url.Path+"favicon.png", http.StripPrefix(url.Path, staticFileHandler))
siteMux.HandleFunc(url.Path+"auth_token.js", server.handleAuthToken)
siteHandler := http.Handler(siteMux)
if server.options.EnableBasicAuth {
log.Printf("Using Basic Authentication")
siteHandler = server.wrapBasicAuth(siteHandler, server.options.Credential)
}
siteHandler = server.wrapHeaders(siteHandler)
wsMux := http.NewServeMux()
wsMux.Handle("/", siteHandler)
wsMux.HandleFunc(url.Path+"ws", server.generateHandleWS(ctx, cancel))
siteHandler = http.Handler(wsMux)
return server.wrapLogger(siteHandler)
}
func (server *Server) setupHTTPServer(handler http.Handler) (*http.Server, error) {
url := server.URL()
log.Printf("URL: %s", url.String())
srv := &http.Server{
Addr: url.Host,
Handler: handler,
}
if server.options.EnableTLSClientAuth {
tlsConfig, err := server.tlsConfig()
if err != nil {
return nil, errors.Wrapf(err, "failed to setup TLS configuration")
}
srv.TLSConfig = tlsConfig
}
return srv, nil
}
func (server *Server) URL() *url.URL {
if server.url == nil {
host := net.JoinHostPort(server.options.Address, server.options.Port)
path := ""
if server.options.EnableRandomUrl {
path += "/" + randomstring.Generate(server.options.RandomUrlLength)
}
scheme := "http"
if server.options.EnableTLS {
scheme = "https"
}
server.url = &url.URL{Scheme: scheme, Host: host, Path: path + "/"}
}
return server.url
}
func (server *Server) tlsConfig() (*tls.Config, error) {
caFile := homedir.Expand(server.options.TLSCACrtFile)
caCert, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, errors.New("could not open CA crt file " + caFile)
}
caCertPool := x509.NewCertPool()
if !caCertPool.AppendCertsFromPEM(caCert) {
return nil, errors.New("could not parse CA crt file data in " + caFile)
}
tlsConfig := &tls.Config{
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
}
return tlsConfig, nil
}

17
server/slave.go Normal file
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@ -0,0 +1,17 @@
package server
import (
"github.com/yudai/gotty/webtty"
)
// Slave is webtty.Slave with some additional methods.
type Slave interface {
webtty.Slave
GetTerminalSize() (width int, height int, err error)
}
type Factory interface {
Name() string
New(params map[string][]string) (Slave, error)
}

17
server/timer.go Normal file
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@ -0,0 +1,17 @@
package server
import (
"time"
)
func (server *Server) stopTimer() {
if server.options.Timeout > 0 {
server.timer.Stop()
}
}
func (server *Server) resetTimer() {
if server.options.Timeout > 0 {
server.timer.Reset(time.Duration(server.options.Timeout) * time.Second)
}
}

4
utils/flags.go
View File

@ -10,6 +10,8 @@ import (
"github.com/codegangsta/cli"
"github.com/fatih/structs"
"github.com/yudai/hcl"
"github.com/yudai/gotty/pkg/homedir"
)
func GenerateFlags(options ...interface{}) (flags []cli.Flag, mappings map[string]string, err error) {
@ -100,7 +102,7 @@ func ApplyFlags(
}
func ApplyConfigFile(filePath string, options ...interface{}) error {
filePath = ExpandHomeDir(filePath)
filePath = homedir.Expand(filePath)
if _, err := os.Stat(filePath); os.IsNotExist(err) {
return err
}

19
vendor/github.com/braintree/manners/LICENSE generated vendored
View File

@ -1,19 +0,0 @@
Copyright (c) 2014 Braintree, a division of PayPal, Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

36
vendor/github.com/braintree/manners/README.md generated vendored
View File

@ -1,36 +0,0 @@
# Manners
A *polite* webserver for Go.
Manners allows you to shut your Go webserver down gracefully, without dropping any requests. It can act as a drop-in replacement for the standard library's http.ListenAndServe function:
```go
func main() {
handler := MyHTTPHandler()
manners.ListenAndServe(":7000", handler)
}
```
Then, when you want to shut the server down:
```go
manners.Close()
```
(Note that this does not block until all the requests are finished. Rather, the call to manners.ListenAndServe will stop blocking when all the requests are finished.)
Manners ensures that all requests are served by incrementing a WaitGroup when a request comes in and decrementing it when the request finishes.
If your request handler spawns Goroutines that are not guaranteed to finish with the request, you can ensure they are also completed with the `StartRoutine` and `FinishRoutine` functions on the server.
### Known Issues
Manners does not correctly shut down long-lived keepalive connections when issued a shutdown command. Clients on an idle keepalive connection may see a connection reset error rather than a close. See https://github.com/braintree/manners/issues/13 for details.
### Compatability
Manners 0.3.0 and above uses standard library functionality introduced in Go 1.3.
### Installation
`go get github.com/braintree/manners`

7
vendor/github.com/braintree/manners/interfaces.go generated vendored
View File

@ -1,7 +0,0 @@
package manners
type waitGroup interface {
Add(int)
Done()
Wait()
}

228
vendor/github.com/braintree/manners/server.go generated vendored
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@ -1,228 +0,0 @@
/*
Package manners provides a wrapper for a standard net/http server that
ensures all active HTTP client have completed their current request
before the server shuts down.
It can be used a drop-in replacement for the standard http package,
or can wrap a pre-configured Server.
eg.
http.Handle("/hello", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello\n"))
})
log.Fatal(manners.ListenAndServe(":8080", nil))
or for a customized server:
s := manners.NewWithServer(&http.Server{
Addr: ":8080",
Handler: myHandler,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
})
log.Fatal(s.ListenAndServe())
The server will shut down cleanly when the Close() method is called:
go func() {
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, os.Interrupt, os.Kill)
<-sigchan
log.Info("Shutting down...")
manners.Close()
}()
http.Handle("/hello", myHandler)
log.Fatal(manners.ListenAndServe(":8080", nil))
*/
package manners
import (
"crypto/tls"
"net"
"net/http"
"sync"
"sync/atomic"
)
// A GracefulServer maintains a WaitGroup that counts how many in-flight
// requests the server is handling. When it receives a shutdown signal,
// it stops accepting new requests but does not actually shut down until
// all in-flight requests terminate.
//
// GracefulServer embeds the underlying net/http.Server making its non-override
// methods and properties avaiable.
//
// It must be initialized by calling NewWithServer.
type GracefulServer struct {
*http.Server
shutdown chan bool
wg waitGroup
lcsmu sync.RWMutex
lastConnState map[net.Conn]http.ConnState
up chan net.Listener // Only used by test code.
}
// NewWithServer wraps an existing http.Server object and returns a
// GracefulServer that supports all of the original Server operations.
func NewWithServer(s *http.Server) *GracefulServer {
return &GracefulServer{
Server: s,
shutdown: make(chan bool),
wg: new(sync.WaitGroup),
lastConnState: make(map[net.Conn]http.ConnState),
}
}
// Close stops the server from accepting new requets and begins shutting down.
// It returns true if it's the first time Close is called.
func (s *GracefulServer) Close() bool {
return <-s.shutdown
}
// ListenAndServe provides a graceful equivalent of net/http.Serve.ListenAndServe.
func (s *GracefulServer) ListenAndServe() error {
addr := s.Addr
if addr == "" {
addr = ":http"
}
listener, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return s.Serve(listener)
}
// ListenAndServeTLS provides a graceful equivalent of net/http.Serve.ListenAndServeTLS.
func (s *GracefulServer) ListenAndServeTLS(certFile, keyFile string) error {
// direct lift from net/http/server.go
addr := s.Addr
if addr == "" {
addr = ":https"
}
config := &tls.Config{}
if s.TLSConfig != nil {
*config = *s.TLSConfig
}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
var err error
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return err
}
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return s.Serve(tls.NewListener(ln, config))
}
// Serve provides a graceful equivalent net/http.Server.Serve.
func (s *GracefulServer) Serve(listener net.Listener) error {
var closing int32
go func() {
s.shutdown <- true
close(s.shutdown)
atomic.StoreInt32(&closing, 1)
s.Server.SetKeepAlivesEnabled(false)
listener.Close()
}()
originalConnState := s.Server.ConnState
// s.ConnState is invoked by the net/http.Server every time a connectiion
// changes state. It keeps track of each connection's state over time,
// enabling manners to handle persisted connections correctly.
s.ConnState = func(conn net.Conn, newState http.ConnState) {
s.lcsmu.RLock()
lastConnState := s.lastConnState[conn]
s.lcsmu.RUnlock()
switch newState {
// New connection -> StateNew
case http.StateNew:
s.StartRoutine()
// (StateNew, StateIdle) -> StateActive
case http.StateActive:
// The connection transitioned from idle back to active
if lastConnState == http.StateIdle {
s.StartRoutine()
}
// StateActive -> StateIdle
// Immediately close newly idle connections; if not they may make
// one more request before SetKeepAliveEnabled(false) takes effect.
case http.StateIdle:
if atomic.LoadInt32(&closing) == 1 {
conn.Close()
}
s.FinishRoutine()
// (StateNew, StateActive, StateIdle) -> (StateClosed, StateHiJacked)
// If the connection was idle we do not need to decrement the counter.
case http.StateClosed, http.StateHijacked:
if lastConnState != http.StateIdle {
s.FinishRoutine()
}
}
s.lcsmu.Lock()
if newState == http.StateClosed || newState == http.StateHijacked {
delete(s.lastConnState, conn)
} else {
s.lastConnState[conn] = newState
}
s.lcsmu.Unlock()
if originalConnState != nil {
originalConnState(conn, newState)
}
}
// A hook to allow the server to notify others when it is ready to receive
// requests; only used by tests.
if s.up != nil {
s.up <- listener
}
err := s.Server.Serve(listener)
// This block is reached when the server has received a shut down command
// or a real error happened.
if err == nil || atomic.LoadInt32(&closing) == 1 {
s.wg.Wait()
return nil
}
return err
}
// StartRoutine increments the server's WaitGroup. Use this if a web request
// starts more goroutines and these goroutines are not guaranteed to finish
// before the request.
func (s *GracefulServer) StartRoutine() {
s.wg.Add(1)
}
// FinishRoutine decrements the server's WaitGroup. Use this to complement
// StartRoutine().
func (s *GracefulServer) FinishRoutine() {
s.wg.Done()
}

35
vendor/github.com/braintree/manners/static.go generated vendored
View File

@ -1,35 +0,0 @@
package manners
import (
"net"
"net/http"
)
var defaultServer *GracefulServer
// ListenAndServe provides a graceful version of the function provided by the
// net/http package. Call Close() to stop the server.
func ListenAndServe(addr string, handler http.Handler) error {
defaultServer = NewWithServer(&http.Server{Addr: addr, Handler: handler})
return defaultServer.ListenAndServe()
}
// ListenAndServeTLS provides a graceful version of the function provided by the
// net/http package. Call Close() to stop the server.
func ListenAndServeTLS(addr string, certFile string, keyFile string, handler http.Handler) error {
defaultServer = NewWithServer(&http.Server{Addr: addr, Handler: handler})
return defaultServer.ListenAndServeTLS(certFile, keyFile)
}
// Serve provides a graceful version of the function provided by the net/http
// package. Call Close() to stop the server.
func Serve(l net.Listener, handler http.Handler) error {
defaultServer = NewWithServer(&http.Server{Handler: handler})
return defaultServer.Serve(l)
}
// Shuts down the default server used by ListenAndServe, ListenAndServeTLS and
// Serve. It returns true if it's the first time Close is called.
func Close() bool {
return defaultServer.Close()
}

24
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof

11
vendor/github.com/pkg/errors/.travis.yml generated vendored Normal file
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@ -0,0 +1,11 @@
language: go
go_import_path: github.com/pkg/errors
go:
- 1.4.3
- 1.5.4
- 1.6.3
- 1.7.3
- tip
script:
- go test -v ./...

23
vendor/github.com/pkg/errors/LICENSE generated vendored Normal file
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Copyright (c) 2015, Dave Cheney <dave@cheney.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

52
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# errors [![Travis-CI](https://travis-ci.org/pkg/errors.svg)](https://travis-ci.org/pkg/errors) [![AppVeyor](https://ci.appveyor.com/api/projects/status/b98mptawhudj53ep/branch/master?svg=true)](https://ci.appveyor.com/project/davecheney/errors/branch/master) [![GoDoc](https://godoc.org/github.com/pkg/errors?status.svg)](http://godoc.org/github.com/pkg/errors) [![Report card](https://goreportcard.com/badge/github.com/pkg/errors)](https://goreportcard.com/report/github.com/pkg/errors)
Package errors provides simple error handling primitives.
`go get github.com/pkg/errors`
The traditional error handling idiom in Go is roughly akin to
```go
if err != nil {
return err
}
```
which applied recursively up the call stack results in error reports without context or debugging information. The errors package allows programmers to add context to the failure path in their code in a way that does not destroy the original value of the error.
## Adding context to an error
The errors.Wrap function returns a new error that adds context to the original error. For example
```go
_, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrap(err, "read failed")
}
```
## Retrieving the cause of an error
Using `errors.Wrap` constructs a stack of errors, adding context to the preceding error. Depending on the nature of the error it may be necessary to reverse the operation of errors.Wrap to retrieve the original error for inspection. Any error value which implements this interface can be inspected by `errors.Cause`.
```go
type causer interface {
Cause() error
}
```
`errors.Cause` will recursively retrieve the topmost error which does not implement `causer`, which is assumed to be the original cause. For example:
```go
switch err := errors.Cause(err).(type) {
case *MyError:
// handle specifically
default:
// unknown error
}
```
[Read the package documentation for more information](https://godoc.org/github.com/pkg/errors).
## Contributing
We welcome pull requests, bug fixes and issue reports. With that said, the bar for adding new symbols to this package is intentionally set high.
Before proposing a change, please discuss your change by raising an issue.
## Licence
BSD-2-Clause

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version: build-{build}.{branch}
clone_folder: C:\gopath\src\github.com\pkg\errors
shallow_clone: true # for startup speed
environment:
GOPATH: C:\gopath
platform:
- x64
# http://www.appveyor.com/docs/installed-software
install:
# some helpful output for debugging builds
- go version
- go env
# pre-installed MinGW at C:\MinGW is 32bit only
# but MSYS2 at C:\msys64 has mingw64
- set PATH=C:\msys64\mingw64\bin;%PATH%
- gcc --version
- g++ --version
build_script:
- go install -v ./...
test_script:
- set PATH=C:\gopath\bin;%PATH%
- go test -v ./...
#artifacts:
# - path: '%GOPATH%\bin\*.exe'
deploy: off

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vendor/github.com/pkg/errors/errors.go generated vendored Normal file
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// Package errors provides simple error handling primitives.
//
// The traditional error handling idiom in Go is roughly akin to
//
// if err != nil {
// return err
// }
//
// which applied recursively up the call stack results in error reports
// without context or debugging information. The errors package allows
// programmers to add context to the failure path in their code in a way
// that does not destroy the original value of the error.
//
// Adding context to an error
//
// The errors.Wrap function returns a new error that adds context to the
// original error by recording a stack trace at the point Wrap is called,
// and the supplied message. For example
//
// _, err := ioutil.ReadAll(r)
// if err != nil {
// return errors.Wrap(err, "read failed")
// }
//
// If additional control is required the errors.WithStack and errors.WithMessage
// functions destructure errors.Wrap into its component operations of annotating
// an error with a stack trace and an a message, respectively.
//
// Retrieving the cause of an error
//
// Using errors.Wrap constructs a stack of errors, adding context to the
// preceding error. Depending on the nature of the error it may be necessary
// to reverse the operation of errors.Wrap to retrieve the original error
// for inspection. Any error value which implements this interface
//
// type causer interface {
// Cause() error
// }
//
// can be inspected by errors.Cause. errors.Cause will recursively retrieve
// the topmost error which does not implement causer, which is assumed to be
// the original cause. For example:
//
// switch err := errors.Cause(err).(type) {
// case *MyError:
// // handle specifically
// default:
// // unknown error
// }
//
// causer interface is not exported by this package, but is considered a part
// of stable public API.
//
// Formatted printing of errors
//
// All error values returned from this package implement fmt.Formatter and can
// be formatted by the fmt package. The following verbs are supported
//
// %s print the error. If the error has a Cause it will be
// printed recursively
// %v see %s
// %+v extended format. Each Frame of the error's StackTrace will
// be printed in detail.
//
// Retrieving the stack trace of an error or wrapper
//
// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
// invoked. This information can be retrieved with the following interface.
//
// type stackTracer interface {
// StackTrace() errors.StackTrace
// }
//
// Where errors.StackTrace is defined as
//
// type StackTrace []Frame
//
// The Frame type represents a call site in the stack trace. Frame supports
// the fmt.Formatter interface that can be used for printing information about
// the stack trace of this error. For example:
//
// if err, ok := err.(stackTracer); ok {
// for _, f := range err.StackTrace() {
// fmt.Printf("%+s:%d", f)
// }
// }
//
// stackTracer interface is not exported by this package, but is considered a part
// of stable public API.
//
// See the documentation for Frame.Format for more details.
package errors
import (
"fmt"
"io"
)
// New returns an error with the supplied message.
// New also records the stack trace at the point it was called.
func New(message string) error {
return &fundamental{
msg: message,
stack: callers(),
}
}
// Errorf formats according to a format specifier and returns the string
// as a value that satisfies error.
// Errorf also records the stack trace at the point it was called.
func Errorf(format string, args ...interface{}) error {
return &fundamental{
msg: fmt.Sprintf(format, args...),
stack: callers(),
}
}
// fundamental is an error that has a message and a stack, but no caller.
type fundamental struct {
msg string
*stack
}
func (f *fundamental) Error() string { return f.msg }
func (f *fundamental) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
io.WriteString(s, f.msg)
f.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, f.msg)
case 'q':
fmt.Fprintf(s, "%q", f.msg)
}
}
// WithStack annotates err with a stack trace at the point WithStack was called.
// If err is nil, WithStack returns nil.
func WithStack(err error) error {
if err == nil {
return nil
}
return &withStack{
err,
callers(),
}
}
type withStack struct {
error
*stack
}
func (w *withStack) Cause() error { return w.error }
func (w *withStack) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v", w.Cause())
w.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, w.Error())
case 'q':
fmt.Fprintf(s, "%q", w.Error())
}
}
// Wrap returns an error annotating err with a stack trace
// at the point Wrap is called, and the supplied message.
// If err is nil, Wrap returns nil.
func Wrap(err error, message string) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: message,
}
return &withStack{
err,
callers(),
}
}
// Wrapf returns an error annotating err with a stack trace
// at the point Wrapf is call, and the format specifier.
// If err is nil, Wrapf returns nil.
func Wrapf(err error, format string, args ...interface{}) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: fmt.Sprintf(format, args...),
}
return &withStack{
err,
callers(),
}
}
// WithMessage annotates err with a new message.
// If err is nil, WithMessage returns nil.
func WithMessage(err error, message string) error {
if err == nil {
return nil
}
return &withMessage{
cause: err,
msg: message,
}
}
type withMessage struct {
cause error
msg string
}
func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
func (w *withMessage) Cause() error { return w.cause }
func (w *withMessage) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v\n", w.Cause())
io.WriteString(s, w.msg)
return
}
fallthrough
case 's', 'q':
io.WriteString(s, w.Error())
}
}
// Cause returns the underlying cause of the error, if possible.
// An error value has a cause if it implements the following
// interface:
//
// type causer interface {
// Cause() error
// }
//
// If the error does not implement Cause, the original error will
// be returned. If the error is nil, nil will be returned without further
// investigation.
func Cause(err error) error {
type causer interface {
Cause() error
}
for err != nil {
cause, ok := err.(causer)
if !ok {
break
}
err = cause.Cause()
}
return err
}

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package errors
import (
"fmt"
"io"
"path"
"runtime"
"strings"
)
// Frame represents a program counter inside a stack frame.
type Frame uintptr
// pc returns the program counter for this frame;
// multiple frames may have the same PC value.
func (f Frame) pc() uintptr { return uintptr(f) - 1 }
// file returns the full path to the file that contains the
// function for this Frame's pc.
func (f Frame) file() string {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return "unknown"
}
file, _ := fn.FileLine(f.pc())
return file
}
// line returns the line number of source code of the
// function for this Frame's pc.
func (f Frame) line() int {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return 0
}
_, line := fn.FileLine(f.pc())
return line
}
// Format formats the frame according to the fmt.Formatter interface.
//
// %s source file
// %d source line
// %n function name
// %v equivalent to %s:%d
//
// Format accepts flags that alter the printing of some verbs, as follows:
//
// %+s path of source file relative to the compile time GOPATH
// %+v equivalent to %+s:%d
func (f Frame) Format(s fmt.State, verb rune) {
switch verb {
case 's':
switch {
case s.Flag('+'):
pc := f.pc()
fn := runtime.FuncForPC(pc)
if fn == nil {
io.WriteString(s, "unknown")
} else {
file, _ := fn.FileLine(pc)
fmt.Fprintf(s, "%s\n\t%s", fn.Name(), file)
}
default:
io.WriteString(s, path.Base(f.file()))
}
case 'd':
fmt.Fprintf(s, "%d", f.line())
case 'n':
name := runtime.FuncForPC(f.pc()).Name()
io.WriteString(s, funcname(name))
case 'v':
f.Format(s, 's')
io.WriteString(s, ":")
f.Format(s, 'd')
}
}
// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
type StackTrace []Frame
func (st StackTrace) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case s.Flag('+'):
for _, f := range st {
fmt.Fprintf(s, "\n%+v", f)
}
case s.Flag('#'):
fmt.Fprintf(s, "%#v", []Frame(st))
default:
fmt.Fprintf(s, "%v", []Frame(st))
}
case 's':
fmt.Fprintf(s, "%s", []Frame(st))
}
}
// stack represents a stack of program counters.
type stack []uintptr
func (s *stack) Format(st fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case st.Flag('+'):
for _, pc := range *s {
f := Frame(pc)
fmt.Fprintf(st, "\n%+v", f)
}
}
}
}
func (s *stack) StackTrace() StackTrace {
f := make([]Frame, len(*s))
for i := 0; i < len(f); i++ {
f[i] = Frame((*s)[i])
}
return f
}
func callers() *stack {
const depth = 32
var pcs [depth]uintptr
n := runtime.Callers(3, pcs[:])
var st stack = pcs[0:n]
return &st
}
// funcname removes the path prefix component of a function's name reported by func.Name().
func funcname(name string) string {
i := strings.LastIndex(name, "/")
name = name[i+1:]
i = strings.Index(name, ".")
return name[i+1:]
}
func trimGOPATH(name, file string) string {
// Here we want to get the source file path relative to the compile time
// GOPATH. As of Go 1.6.x there is no direct way to know the compiled
// GOPATH at runtime, but we can infer the number of path segments in the
// GOPATH. We note that fn.Name() returns the function name qualified by
// the import path, which does not include the GOPATH. Thus we can trim
// segments from the beginning of the file path until the number of path
// separators remaining is one more than the number of path separators in
// the function name. For example, given:
//
// GOPATH /home/user
// file /home/user/src/pkg/sub/file.go
// fn.Name() pkg/sub.Type.Method
//
// We want to produce:
//
// pkg/sub/file.go
//
// From this we can easily see that fn.Name() has one less path separator
// than our desired output. We count separators from the end of the file
// path until it finds two more than in the function name and then move
// one character forward to preserve the initial path segment without a
// leading separator.
const sep = "/"
goal := strings.Count(name, sep) + 2
i := len(file)
for n := 0; n < goal; n++ {
i = strings.LastIndex(file[:i], sep)
if i == -1 {
// not enough separators found, set i so that the slice expression
// below leaves file unmodified
i = -len(sep)
break
}
}
// get back to 0 or trim the leading separator
file = file[i+len(sep):]
return file
}

21
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@ -1,21 +0,0 @@
The MIT License (MIT)
Copyright (c) 2015 Iwasaki Yudai
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

53
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# Unblocking Mutex
This simple package provides unblocking mutexes for those who don't want to write many `select` clauses or get confused by numerous channels.
## Usage Example
```go
package main
import (
"fmt"
"github.com/yudai/umutex"
)
func main() {
// Create mutex
mutex := umutex.New()
// First time, try should succeed
if mutex.TryLock() {
fmt.Println("SUCCESS")
} else {
fmt.Println("FAILURE")
}
// Second time, try should fail as it's locked
if mutex.TryLock() {
fmt.Println("SUCCESS")
} else {
fmt.Println("FAILURE")
}
// Unclock mutex
mutex.Unlock()
// Third time, try should succeed again
if mutex.TryLock() {
fmt.Println("SUCCESS")
} else {
fmt.Println("FAILURE")
}
}
```
The output is;
```sh
SUCCESS
FAILURE
SUCCESS
```
`ForceLock()` method is also availale for normal blocking lock.

38
vendor/github.com/yudai/umutex/umutex.go generated vendored
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// Package umutex provides unblocking mutex
package umutex
// UnblockingMutex represents an unblocking mutex.
type UnblockingMutex struct {
// Raw channel
C chan bool
}
// New returnes a new unblocking mutex instance.
func New() *UnblockingMutex {
return &UnblockingMutex{
C: make(chan bool, 1),
}
}
// TryLock tries to lock the mutex.
// When the mutex is free at the time, the function locks the mutex and return
// true. Otherwise false will be returned. In the both cases, this function
// doens't block and return the result immediately.
func (m UnblockingMutex) TryLock() (result bool) {
select {
case m.C <- true:
return true
default:
return false
}
}
// Unlock unclocks the mutex.
func (m UnblockingMutex) Unlock() {
<-m.C
}
// ForceLock surely locks the mutex, however, this function blocks when the mutex is locked at the time.
func (m UnblockingMutex) ForceLock() {
m.C <- false
}

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package main
var Version = "2.0.0-alpha"

3
webtty/doc.go Normal file
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// Package webtty provides a protocl and an implementation to
// controll terminals thorough networks.
package webtty

10
webtty/errors.go Normal file
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package webtty
import (
"errors"
)
var (
ErrSlaveClosed = errors.New("slave closed")
ErrMasterClosed = errors.New("master closed")
)

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/*
Copyright (c) 2013 The Gorilla WebSocket Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package webtty
// Master represents a PTY master, usually it's a websocket connection.
type Master interface {
WriteMessage(messageType int, data []byte) error
ReadMessage() (messageType int, p []byte, err error)
}
// The message types are defined in RFC 6455, section 11.8.
const (
// TextMessage denotes a text data message. The text message payload is
// interpreted as UTF-8 encoded text data.
WSTextMessage = 1
// BinaryMessage denotes a binary data message.
WSBinaryMessage = 2
// CloseMessage denotes a close control message. The optional message
// payload contains a numeric code and text. Use the FormatCloseMessage
// function to format a close message payload.
WSCloseMessage = 8
// PingMessage denotes a ping control message. The optional message payload
// is UTF-8 encoded text.
WSPingMessage = 9
// PongMessage denotes a ping control message. The optional message payload
// is UTF-8 encoded text.
WSPongMessage = 10
)

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package webtty
var Protocols = []string{"webtty"}
const (
// Unknown message type, maybe sent by a bug
UnknownInput = '0'
// User input typically from a keyboard
Input = '1'
// Ping to the server
Ping = '2'
// Notify that the browser size has been changed
ResizeTerminal = '3'
)
const (
// Unknown message type, maybe set by a bug
UnknownOutput = '0'
// Normal output to the terminal
Output = '1'
// Pong to the browser
Pong = '2'
// Set window title of the terminal
SetWindowTitle = '3'
// Set terminal preference
SetPreferences = '4'
// Make terminal to reconnect
SetReconnect = '5'
)

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webtty/option.go Normal file
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package webtty
import (
"encoding/json"
"github.com/pkg/errors"
)
// Option is an option for WebTTY.
type Option func(*WebTTY) error
// WithPermitWrite sets a WebTTY to accept input from slaves.
func WithPermitWrite() Option {
return func(wt *WebTTY) error {
wt.permitWrite = true
return nil
}
}
// WithFixedSize sets a fixed size to TTY master.
func WithFixedSize(width int, height int) Option {
return func(wt *WebTTY) error {
wt.width = width
wt.height = height
return nil
}
}
// WithWindowTitle sets the default window title of the session
func WithWindowTitle(windowTitle []byte) Option {
return func(wt *WebTTY) error {
wt.windowTitle = windowTitle
return nil
}
}
// WithReconnect enables reconnection on the master side.
func WithReconnect(timeInSeconds int) Option {
return func(wt *WebTTY) error {
wt.reconnect = timeInSeconds
return nil
}
}
// WithMasterPreferences sets an optional configuration of master.
func WithMasterPreferences(preferences interface{}) Option {
return func(wt *WebTTY) error {
prefs, err := json.Marshal(preferences)
if err != nil {
return errors.Wrapf(err, "failed to marshal preferences as JSON")
}
wt.masterPrefs = prefs
return nil
}
}

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webtty/slave.go Normal file
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package webtty
import (
"io"
)
// Slave represents a PTY slave, typically it's a local command.
type Slave interface {
io.ReadWriteCloser
WindowTitleVariables() map[string]interface{}
ResizeTerminal(columns int, rows int) error
}

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webtty/webtty.go Normal file
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package webtty
import (
"context"
"encoding/base64"
"encoding/json"
"sync"
"github.com/pkg/errors"
)
// WebTTY bridges sets of a PTY slave and its PTY master.
// To support text-based streams and side channel commands such as
// terminal resizing, WebTTY uses an original protocol.
type WebTTY struct {
// PTY Master, which probably a connection to browser
masterConn Master
// PTY Slave
slave Slave
windowTitle []byte
permitWrite bool
width int
height int
reconnect int // in milliseconds
masterPrefs []byte
bufferSize int
writeMutex sync.Mutex
}
// New creates a new instance of WebTTY.
// masterConn is a connection to the PTY master,
// typically it's a websocket connection to a client.
// slave is a PTY slave such as a local command with a PTY.
func New(masterConn Master, slave Slave, options ...Option) (*WebTTY, error) {
wt := &WebTTY{
masterConn: masterConn,
slave: slave,
permitWrite: false,
width: 0,
height: 0,
bufferSize: 1024,
}
for _, option := range options {
option(wt)
}
return wt, nil
}
// Run starts the WebTTY.
// This method blocks until the context is canceled.
// Note that the master and slave are left intact even
// after the context is canceled. Closing them is caller's
// responsibility.
func (wt *WebTTY) Run(ctx context.Context) error {
err := wt.sendInitializeMessage()
if err != nil {
return errors.Wrapf(err, "failed to send initializing message")
}
errs := make(chan error, 2)
go func() {
errs <- func() error {
buffer := make([]byte, wt.bufferSize)
for {
n, err := wt.slave.Read(buffer)
if err != nil {
return ErrSlaveClosed
}
err = wt.handleSlaveReadEvent(buffer[:n])
if err != nil {
return err
}
}
}()
}()
go func() {
errs <- func() error {
for {
typ, data, err := wt.masterConn.ReadMessage()
if err != nil {
return ErrMasterClosed
}
if typ != WSTextMessage {
continue
}
err = wt.handleMasterReadEvent(data)
if err != nil {
return err
}
}
}()
}()
select {
case <-ctx.Done():
err = ctx.Err()
case err = <-errs:
}
return err
}
func (wt *WebTTY) sendInitializeMessage() error {
err := wt.masterWrite(append([]byte{SetWindowTitle}, wt.windowTitle...))
if err != nil {
return errors.Wrapf(err, "failed to send window title")
}
if wt.reconnect > 0 {
reconnect, _ := json.Marshal(wt.reconnect)
err := wt.masterWrite(append([]byte{SetReconnect}, reconnect...))
if err != nil {
return errors.Wrapf(err, "failed to set reconnect")
}
}
if wt.masterPrefs != nil {
err := wt.masterWrite(append([]byte{SetPreferences}, wt.masterPrefs...))
if err != nil {
return errors.Wrapf(err, "failed to set preferences")
}
}
return nil
}
func (wt *WebTTY) handleSlaveReadEvent(data []byte) error {
safeMessage := base64.StdEncoding.EncodeToString(data)
err := wt.masterWrite(append([]byte{Output}, []byte(safeMessage)...))
if err != nil {
return errors.Wrapf(err, "failed to send message to master")
}
return nil
}
func (wt *WebTTY) masterWrite(data []byte) error {
wt.writeMutex.Lock()
defer wt.writeMutex.Unlock()
err := wt.masterConn.WriteMessage(WSTextMessage, data)
if err != nil {
return errors.Wrapf(err, "failed to write to master")
}
return nil
}
func (wt *WebTTY) handleMasterReadEvent(data []byte) error {
if len(data) == 0 {
return errors.New("unexpected zero length read from master")
}
switch data[0] {
case Input:
if !wt.permitWrite {
return nil
}
if len(data) <= 1 {
return nil
}
_, err := wt.slave.Write(data[1:])
if err != nil {
return errors.Wrapf(err, "failed to write received data to slave")
}
case Ping:
err := wt.masterWrite([]byte{Pong})
if err != nil {
return errors.Wrapf(err, "failed to return Pong message to master")
}
case ResizeTerminal:
if wt.width != 0 && wt.height != 0 {
break
}
if len(data) <= 1 {
return errors.New("received malformed remote command for terminal resize: empty payload")
}
var args argResizeTerminal
err := json.Unmarshal(data[1:], &args)
if err != nil {
return errors.Wrapf(err, "received malformed data for terminal resize")
}
rows := wt.height
if rows == 0 {
rows = int(args.Rows)
}
columns := wt.width
if columns == 0 {
columns = int(args.Columns)
}
wt.slave.ResizeTerminal(columns, rows)
default:
return errors.Errorf("unknown message type `%c`", data[0])
}
return nil
}
type argResizeTerminal struct {
Columns float64
Rows float64
}

139
webtty/webtty_test.go Normal file
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package webtty
import (
"bytes"
"context"
"encoding/base64"
"io"
"sync"
"testing"
)
type pipePair struct {
*io.PipeReader
*io.PipeWriter
}
func TestWriteFromPTY(t *testing.T) {
connInPipeReader, connInPipeWriter := io.Pipe() // in to conn
connOutPipeReader, _ := io.Pipe() // out from conn
conn := pipePair{
connOutPipeReader,
connInPipeWriter,
}
dt, err := New(conn)
if err != nil {
t.Fatalf("Unexpected error from New(): %s", err)
}
ctx, cancel := context.WithCancel(context.Background())
var wg sync.WaitGroup
wg.Add(1)
go func() {
wg.Done()
err := dt.Run(ctx)
if err != nil {
t.Fatalf("Unexpected error from Run(): %s", err)
}
}()
message := []byte("foobar")
n, err := dt.TTY().Write(message)
if err != nil {
t.Fatalf("Unexpected error from Write(): %s", err)
}
if n != len(message) {
t.Fatalf("Write() accepted `%d` for message `%s`", n, message)
}
buf := make([]byte, 1024)
n, err = connInPipeReader.Read(buf)
if err != nil {
t.Fatalf("Unexpected error from Read(): %s", err)
}
if buf[0] != Output {
t.Fatalf("Unexpected message type `%c`", buf[0])
}
decoded := make([]byte, 1024)
n, err = base64.StdEncoding.Decode(decoded, buf[1:n])
if err != nil {
t.Fatalf("Unexpected error from Decode(): %s", err)
}
if !bytes.Equal(decoded[:n], message) {
t.Fatalf("Unexpected message received: `%s`", decoded[:n])
}
cancel()
wg.Wait()
}
func TestWriteFromConn(t *testing.T) {
connInPipeReader, connInPipeWriter := io.Pipe() // in to conn
connOutPipeReader, connOutPipeWriter := io.Pipe() // out from conn
conn := pipePair{
connOutPipeReader,
connInPipeWriter,
}
dt, err := New(conn)
if err != nil {
t.Fatalf("Unexpected error from New(): %s", err)
}
ctx, cancel := context.WithCancel(context.Background())
var wg sync.WaitGroup
wg.Add(1)
go func() {
wg.Done()
err := dt.Run(ctx)
if err != nil {
t.Fatalf("Unexpected error from Run(): %s", err)
}
}()
var (
message []byte
n int
)
readBuf := make([]byte, 1024)
// input
message = []byte("0hello\n") // line buffered canonical mode
n, err = connOutPipeWriter.Write(message)
if err != nil {
t.Fatalf("Unexpected error from Write(): %s", err)
}
if n != len(message) {
t.Fatalf("Write() accepted `%d` for message `%s`", n, message)
}
n, err = dt.TTY().Read(readBuf)
if err != nil {
t.Fatalf("Unexpected error from Write(): %s", err)
}
if !bytes.Equal(readBuf[:n], message[1:]) {
t.Fatalf("Unexpected message received: `%s`", readBuf[:n])
}
// ping
message = []byte("1\n") // line buffered canonical mode
n, err = connOutPipeWriter.Write(message)
if n != len(message) {
t.Fatalf("Write() accepted `%d` for message `%s`", n, message)
}
n, err = connInPipeReader.Read(readBuf)
if err != nil {
t.Fatalf("Unexpected error from Read(): %s", err)
}
if !bytes.Equal(readBuf[:n], []byte{'1'}) {
t.Fatalf("Unexpected message received: `%s`", readBuf[:n])
}
// TODO: resize
cancel()
wg.Wait()
}

2
wercker.yml
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@ -1,4 +1,4 @@
box: golang:1.7.3
box: golang:1.8.3
build:
steps: