163 lines
2.9 KiB
Go
163 lines
2.9 KiB
Go
package grpchijack
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import (
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"context"
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"io"
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"net"
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"strings"
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"sync"
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"time"
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controlapi "github.com/moby/buildkit/api/services/control"
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"github.com/moby/buildkit/session"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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)
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func Dialer(api controlapi.ControlClient) session.Dialer {
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return func(ctx context.Context, proto string, meta map[string][]string) (net.Conn, error) {
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meta = lowerHeaders(meta)
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md := metadata.MD(meta)
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ctx = metadata.NewOutgoingContext(ctx, md)
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stream, err := api.Session(ctx)
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if err != nil {
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return nil, err
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}
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c, _ := streamToConn(stream)
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return c, nil
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}
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}
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func streamToConn(stream grpc.Stream) (net.Conn, <-chan struct{}) {
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closeCh := make(chan struct{})
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c := &conn{stream: stream, buf: make([]byte, 32*1<<10), closeCh: closeCh}
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return c, closeCh
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}
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type conn struct {
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stream grpc.Stream
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buf []byte
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lastBuf []byte
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closedOnce sync.Once
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readMu sync.Mutex
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writeMu sync.Mutex
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err error
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closeCh chan struct{}
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}
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func (c *conn) Read(b []byte) (n int, err error) {
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c.readMu.Lock()
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defer c.readMu.Unlock()
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if c.lastBuf != nil {
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n := copy(b, c.lastBuf)
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c.lastBuf = c.lastBuf[n:]
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if len(c.lastBuf) == 0 {
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c.lastBuf = nil
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}
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return n, nil
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}
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m := new(controlapi.BytesMessage)
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m.Data = c.buf
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if err := c.stream.RecvMsg(m); err != nil {
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return 0, err
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}
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c.buf = m.Data[:cap(m.Data)]
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n = copy(b, m.Data)
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if n < len(m.Data) {
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c.lastBuf = m.Data[n:]
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}
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return n, nil
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}
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func (c *conn) Write(b []byte) (int, error) {
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c.writeMu.Lock()
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defer c.writeMu.Unlock()
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m := &controlapi.BytesMessage{Data: b}
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if err := c.stream.SendMsg(m); err != nil {
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return 0, err
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}
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return len(b), nil
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}
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func (c *conn) Close() (err error) {
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c.closedOnce.Do(func() {
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defer func() {
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close(c.closeCh)
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}()
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if cs, ok := c.stream.(grpc.ClientStream); ok {
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c.writeMu.Lock()
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err = cs.CloseSend()
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c.writeMu.Unlock()
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if err != nil {
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return
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}
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}
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c.readMu.Lock()
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for {
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m := new(controlapi.BytesMessage)
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m.Data = c.buf
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err = c.stream.RecvMsg(m)
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if err != nil {
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if err != io.EOF {
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c.readMu.Unlock()
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return
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}
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err = nil
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break
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}
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c.buf = m.Data[:cap(m.Data)]
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c.lastBuf = append(c.lastBuf, c.buf...)
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}
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c.readMu.Unlock()
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})
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return nil
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}
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func (c *conn) LocalAddr() net.Addr {
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return dummyAddr{}
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}
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func (c *conn) RemoteAddr() net.Addr {
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return dummyAddr{}
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}
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func (c *conn) SetDeadline(t time.Time) error {
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return nil
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}
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func (c *conn) SetReadDeadline(t time.Time) error {
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return nil
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}
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func (c *conn) SetWriteDeadline(t time.Time) error {
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return nil
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}
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type dummyAddr struct {
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}
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func (d dummyAddr) Network() string {
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return "tcp"
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}
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func (d dummyAddr) String() string {
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return "localhost"
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}
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func lowerHeaders(in map[string][]string) map[string][]string {
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out := map[string][]string{}
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for k := range in {
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out[strings.ToLower(k)] = in[k]
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}
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return out
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}
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