mirror of
https://github.com/strongdm/comply
synced 2024-11-16 21:04:54 +00:00
476 lines
8.4 KiB
Go
476 lines
8.4 KiB
Go
package readline
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import (
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"bufio"
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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"net"
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"os"
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"sync"
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"sync/atomic"
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)
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type MsgType int16
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const (
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T_DATA = MsgType(iota)
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T_WIDTH
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T_WIDTH_REPORT
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T_ISTTY_REPORT
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T_RAW
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T_ERAW // exit raw
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T_EOF
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)
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type RemoteSvr struct {
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eof int32
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closed int32
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width int32
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reciveChan chan struct{}
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writeChan chan *writeCtx
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conn net.Conn
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isTerminal bool
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funcWidthChan func()
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stopChan chan struct{}
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dataBufM sync.Mutex
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dataBuf bytes.Buffer
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}
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type writeReply struct {
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n int
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err error
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}
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type writeCtx struct {
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msg *Message
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reply chan *writeReply
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}
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func newWriteCtx(msg *Message) *writeCtx {
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return &writeCtx{
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msg: msg,
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reply: make(chan *writeReply),
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}
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}
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func NewRemoteSvr(conn net.Conn) (*RemoteSvr, error) {
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rs := &RemoteSvr{
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width: -1,
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conn: conn,
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writeChan: make(chan *writeCtx),
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reciveChan: make(chan struct{}),
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stopChan: make(chan struct{}),
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}
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buf := bufio.NewReader(rs.conn)
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if err := rs.init(buf); err != nil {
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return nil, err
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}
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go rs.readLoop(buf)
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go rs.writeLoop()
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return rs, nil
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}
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func (r *RemoteSvr) init(buf *bufio.Reader) error {
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m, err := ReadMessage(buf)
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if err != nil {
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return err
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}
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// receive isTerminal
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if m.Type != T_ISTTY_REPORT {
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return fmt.Errorf("unexpected init message")
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}
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r.GotIsTerminal(m.Data)
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// receive width
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m, err = ReadMessage(buf)
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if err != nil {
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return err
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}
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if m.Type != T_WIDTH_REPORT {
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return fmt.Errorf("unexpected init message")
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}
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r.GotReportWidth(m.Data)
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return nil
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}
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func (r *RemoteSvr) HandleConfig(cfg *Config) {
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cfg.Stderr = r
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cfg.Stdout = r
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cfg.Stdin = r
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cfg.FuncExitRaw = r.ExitRawMode
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cfg.FuncIsTerminal = r.IsTerminal
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cfg.FuncMakeRaw = r.EnterRawMode
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cfg.FuncExitRaw = r.ExitRawMode
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cfg.FuncGetWidth = r.GetWidth
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cfg.FuncOnWidthChanged = func(f func()) {
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r.funcWidthChan = f
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}
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}
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func (r *RemoteSvr) IsTerminal() bool {
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return r.isTerminal
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}
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func (r *RemoteSvr) checkEOF() error {
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if atomic.LoadInt32(&r.eof) == 1 {
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return io.EOF
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}
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return nil
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}
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func (r *RemoteSvr) Read(b []byte) (int, error) {
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r.dataBufM.Lock()
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n, err := r.dataBuf.Read(b)
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r.dataBufM.Unlock()
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if n == 0 {
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if err := r.checkEOF(); err != nil {
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return 0, err
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}
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}
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if n == 0 && err == io.EOF {
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<-r.reciveChan
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r.dataBufM.Lock()
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n, err = r.dataBuf.Read(b)
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r.dataBufM.Unlock()
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}
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if n == 0 {
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if err := r.checkEOF(); err != nil {
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return 0, err
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}
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}
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return n, err
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}
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func (r *RemoteSvr) writeMsg(m *Message) error {
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ctx := newWriteCtx(m)
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r.writeChan <- ctx
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reply := <-ctx.reply
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return reply.err
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}
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func (r *RemoteSvr) Write(b []byte) (int, error) {
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ctx := newWriteCtx(NewMessage(T_DATA, b))
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r.writeChan <- ctx
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reply := <-ctx.reply
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return reply.n, reply.err
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}
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func (r *RemoteSvr) EnterRawMode() error {
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return r.writeMsg(NewMessage(T_RAW, nil))
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}
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func (r *RemoteSvr) ExitRawMode() error {
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return r.writeMsg(NewMessage(T_ERAW, nil))
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}
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func (r *RemoteSvr) writeLoop() {
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defer r.Close()
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loop:
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for {
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select {
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case ctx, ok := <-r.writeChan:
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if !ok {
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break
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}
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n, err := ctx.msg.WriteTo(r.conn)
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ctx.reply <- &writeReply{n, err}
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case <-r.stopChan:
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break loop
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}
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}
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}
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func (r *RemoteSvr) Close() error {
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if atomic.CompareAndSwapInt32(&r.closed, 0, 1) {
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close(r.stopChan)
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r.conn.Close()
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}
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return nil
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}
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func (r *RemoteSvr) readLoop(buf *bufio.Reader) {
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defer r.Close()
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for {
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m, err := ReadMessage(buf)
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if err != nil {
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break
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}
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switch m.Type {
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case T_EOF:
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atomic.StoreInt32(&r.eof, 1)
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select {
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case r.reciveChan <- struct{}{}:
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default:
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}
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case T_DATA:
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r.dataBufM.Lock()
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r.dataBuf.Write(m.Data)
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r.dataBufM.Unlock()
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select {
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case r.reciveChan <- struct{}{}:
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default:
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}
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case T_WIDTH_REPORT:
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r.GotReportWidth(m.Data)
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case T_ISTTY_REPORT:
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r.GotIsTerminal(m.Data)
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}
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}
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}
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func (r *RemoteSvr) GotIsTerminal(data []byte) {
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if binary.BigEndian.Uint16(data) == 0 {
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r.isTerminal = false
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} else {
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r.isTerminal = true
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}
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}
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func (r *RemoteSvr) GotReportWidth(data []byte) {
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atomic.StoreInt32(&r.width, int32(binary.BigEndian.Uint16(data)))
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if r.funcWidthChan != nil {
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r.funcWidthChan()
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}
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}
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func (r *RemoteSvr) GetWidth() int {
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return int(atomic.LoadInt32(&r.width))
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}
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// -----------------------------------------------------------------------------
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type Message struct {
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Type MsgType
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Data []byte
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}
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func ReadMessage(r io.Reader) (*Message, error) {
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m := new(Message)
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var length int32
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if err := binary.Read(r, binary.BigEndian, &length); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &m.Type); err != nil {
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return nil, err
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}
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m.Data = make([]byte, int(length)-2)
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if _, err := io.ReadFull(r, m.Data); err != nil {
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return nil, err
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}
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return m, nil
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}
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func NewMessage(t MsgType, data []byte) *Message {
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return &Message{t, data}
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}
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func (m *Message) WriteTo(w io.Writer) (int, error) {
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buf := bytes.NewBuffer(make([]byte, 0, len(m.Data)+2+4))
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binary.Write(buf, binary.BigEndian, int32(len(m.Data)+2))
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binary.Write(buf, binary.BigEndian, m.Type)
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buf.Write(m.Data)
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n, err := buf.WriteTo(w)
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return int(n), err
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}
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// -----------------------------------------------------------------------------
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type RemoteCli struct {
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conn net.Conn
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raw RawMode
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receiveChan chan struct{}
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inited int32
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isTerminal *bool
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data bytes.Buffer
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dataM sync.Mutex
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}
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func NewRemoteCli(conn net.Conn) (*RemoteCli, error) {
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r := &RemoteCli{
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conn: conn,
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receiveChan: make(chan struct{}),
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}
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return r, nil
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}
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func (r *RemoteCli) MarkIsTerminal(is bool) {
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r.isTerminal = &is
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}
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func (r *RemoteCli) init() error {
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if !atomic.CompareAndSwapInt32(&r.inited, 0, 1) {
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return nil
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}
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if err := r.reportIsTerminal(); err != nil {
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return err
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}
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if err := r.reportWidth(); err != nil {
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return err
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}
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// register sig for width changed
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DefaultOnWidthChanged(func() {
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r.reportWidth()
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})
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return nil
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}
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func (r *RemoteCli) writeMsg(m *Message) error {
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r.dataM.Lock()
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_, err := m.WriteTo(r.conn)
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r.dataM.Unlock()
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return err
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}
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func (r *RemoteCli) Write(b []byte) (int, error) {
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m := NewMessage(T_DATA, b)
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r.dataM.Lock()
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_, err := m.WriteTo(r.conn)
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r.dataM.Unlock()
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return len(b), err
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}
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func (r *RemoteCli) reportWidth() error {
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screenWidth := GetScreenWidth()
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data := make([]byte, 2)
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binary.BigEndian.PutUint16(data, uint16(screenWidth))
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msg := NewMessage(T_WIDTH_REPORT, data)
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if err := r.writeMsg(msg); err != nil {
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return err
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}
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return nil
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}
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func (r *RemoteCli) reportIsTerminal() error {
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var isTerminal bool
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if r.isTerminal != nil {
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isTerminal = *r.isTerminal
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} else {
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isTerminal = DefaultIsTerminal()
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}
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data := make([]byte, 2)
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if isTerminal {
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binary.BigEndian.PutUint16(data, 1)
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} else {
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binary.BigEndian.PutUint16(data, 0)
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}
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msg := NewMessage(T_ISTTY_REPORT, data)
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if err := r.writeMsg(msg); err != nil {
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return err
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}
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return nil
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}
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func (r *RemoteCli) readLoop() {
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buf := bufio.NewReader(r.conn)
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for {
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msg, err := ReadMessage(buf)
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if err != nil {
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break
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}
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switch msg.Type {
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case T_ERAW:
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r.raw.Exit()
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case T_RAW:
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r.raw.Enter()
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case T_DATA:
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os.Stdout.Write(msg.Data)
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}
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}
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}
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func (r *RemoteCli) ServeBy(source io.Reader) error {
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if err := r.init(); err != nil {
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return err
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}
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go func() {
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defer r.Close()
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for {
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n, _ := io.Copy(r, source)
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if n == 0 {
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break
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}
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}
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}()
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defer r.raw.Exit()
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r.readLoop()
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return nil
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}
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func (r *RemoteCli) Close() {
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r.writeMsg(NewMessage(T_EOF, nil))
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}
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func (r *RemoteCli) Serve() error {
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return r.ServeBy(os.Stdin)
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}
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func ListenRemote(n, addr string, cfg *Config, h func(*Instance), onListen ...func(net.Listener) error) error {
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ln, err := net.Listen(n, addr)
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if err != nil {
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return err
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}
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if len(onListen) > 0 {
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if err := onListen[0](ln); err != nil {
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return err
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}
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}
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for {
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conn, err := ln.Accept()
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if err != nil {
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break
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}
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go func() {
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defer conn.Close()
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rl, err := HandleConn(*cfg, conn)
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if err != nil {
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return
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}
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h(rl)
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}()
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}
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return nil
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}
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func HandleConn(cfg Config, conn net.Conn) (*Instance, error) {
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r, err := NewRemoteSvr(conn)
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if err != nil {
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return nil, err
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}
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r.HandleConfig(&cfg)
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rl, err := NewEx(&cfg)
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if err != nil {
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return nil, err
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}
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return rl, nil
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}
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func DialRemote(n, addr string) error {
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conn, err := net.Dial(n, addr)
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if err != nil {
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return err
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}
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defer conn.Close()
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cli, err := NewRemoteCli(conn)
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if err != nil {
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return err
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}
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return cli.Serve()
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}
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