Bump moby/buildkit

Signed-off-by: ulyssessouza <ulyssessouza@gmail.com>

vendor/github.com/containerd/ttrpc/client.go

@@ -29,6 +29,7 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
 
@@ -36,36 +37,52 @@ import (
 // closed.
 var ErrClosed = errors.New("ttrpc: closed")
 
+// Client for a ttrpc server
 type Client struct {
 	codec   codec
 	conn    net.Conn
 	channel *channel
 	calls   chan *callRequest
 
-	closed    chan struct{}
-	closeOnce sync.Once
-	closeFunc func()
-	done      chan struct{}
-	err       error
+	ctx    context.Context
+	closed func()
+
+	closeOnce     sync.Once
+	userCloseFunc func()
+
+	errOnce     sync.Once
+	err         error
+	interceptor UnaryClientInterceptor
 }
 
+// ClientOpts configures a client
 type ClientOpts func(c *Client)
 
+// WithOnClose sets the close func whenever the client's Close() method is called
 func WithOnClose(onClose func()) ClientOpts {
 	return func(c *Client) {
-		c.closeFunc = onClose
+		c.userCloseFunc = onClose
+	}
+}
+
+// WithUnaryClientInterceptor sets the provided client interceptor
+func WithUnaryClientInterceptor(i UnaryClientInterceptor) ClientOpts {
+	return func(c *Client) {
+		c.interceptor = i
 	}
 }
 
 func NewClient(conn net.Conn, opts ...ClientOpts) *Client {
+	ctx, cancel := context.WithCancel(context.Background())
 	c := &Client{
-		codec:     codec{},
-		conn:      conn,
-		channel:   newChannel(conn),
-		calls:     make(chan *callRequest),
-		closed:    make(chan struct{}),
-		done:      make(chan struct{}),
-		closeFunc: func() {},
+		codec:         codec{},
+		conn:          conn,
+		channel:       newChannel(conn),
+		calls:         make(chan *callRequest),
+		closed:        cancel,
+		ctx:           ctx,
+		userCloseFunc: func() {},
+		interceptor:   defaultClientInterceptor,
 	}
 
 	for _, o := range opts {
@@ -99,11 +116,18 @@ func (c *Client) Call(ctx context.Context, service, method string, req, resp int
 		cresp = &Response{}
 	)
 
+	if metadata, ok := GetMetadata(ctx); ok {
+		metadata.setRequest(creq)
+	}
+
 	if dl, ok := ctx.Deadline(); ok {
 		creq.TimeoutNano = dl.Sub(time.Now()).Nanoseconds()
 	}
 
-	if err := c.dispatch(ctx, creq, cresp); err != nil {
+	info := &UnaryClientInfo{
+		FullMethod: fullPath(service, method),
+	}
+	if err := c.interceptor(ctx, creq, cresp, info, c.dispatch); err != nil {
 		return err
 	}
 
@@ -111,11 +135,10 @@ func (c *Client) Call(ctx context.Context, service, method string, req, resp int
 		return err
 	}
 
-	if cresp.Status == nil {
-		return errors.New("no status provided on response")
+	if cresp.Status != nil && cresp.Status.Code != int32(codes.OK) {
+		return status.ErrorProto(cresp.Status)
 	}
-
-	return status.ErrorProto(cresp.Status)
+	return nil
 }
 
 func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) error {
@@ -131,8 +154,8 @@ func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) err
 	case <-ctx.Done():
 		return ctx.Err()
 	case c.calls <- call:
-	case <-c.done:
-		return c.err
+	case <-c.ctx.Done():
+		return c.error()
 	}
 
 	select {
@@ -140,16 +163,15 @@ func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) err
 		return ctx.Err()
 	case err := <-errs:
 		return filterCloseErr(err)
-	case <-c.done:
-		return c.err
+	case <-c.ctx.Done():
+		return c.error()
 	}
 }
 
 func (c *Client) Close() error {
 	c.closeOnce.Do(func() {
-		close(c.closed)
+		c.closed()
 	})
-
 	return nil
 }
 
@@ -159,51 +181,82 @@ type message struct {
 	err error
 }
 
-func (c *Client) run() {
-	var (
-		streamID    uint32 = 1
-		waiters            = make(map[uint32]*callRequest)
-		calls              = c.calls
-		incoming           = make(chan *message)
-		shutdown           = make(chan struct{})
-		shutdownErr error
-	)
+type receiver struct {
+	wg       *sync.WaitGroup
+	messages chan *message
+	err      error
+}
 
-	go func() {
-		defer close(shutdown)
+func (r *receiver) run(ctx context.Context, c *channel) {
+	defer r.wg.Done()
 
-		// start one more goroutine to recv messages without blocking.
-		for {
-			mh, p, err := c.channel.recv(context.TODO())
+	for {
+		select {
+		case <-ctx.Done():
+			r.err = ctx.Err()
+			return
+		default:
+			mh, p, err := c.recv()
 			if err != nil {
 				_, ok := status.FromError(err)
 				if !ok {
 					// treat all errors that are not an rpc status as terminal.
 					// all others poison the connection.
-					shutdownErr = err
+					r.err = filterCloseErr(err)
 					return
 				}
 			}
 			select {
-			case incoming <- &message{
+			case r.messages <- &message{
 				messageHeader: mh,
 				p:             p[:mh.Length],
 				err:           err,
 			}:
-			case <-c.done:
+			case <-ctx.Done():
+				r.err = ctx.Err()
 				return
 			}
 		}
-	}()
+	}
+}
 
-	defer c.conn.Close()
-	defer close(c.done)
-	defer c.closeFunc()
+func (c *Client) run() {
+	var (
+		streamID      uint32 = 1
+		waiters              = make(map[uint32]*callRequest)
+		calls                = c.calls
+		incoming             = make(chan *message)
+		receiversDone        = make(chan struct{})
+		wg            sync.WaitGroup
+	)
+
+	// broadcast the shutdown error to the remaining waiters.
+	abortWaiters := func(wErr error) {
+		for _, waiter := range waiters {
+			waiter.errs <- wErr
+		}
+	}
+	recv := &receiver{
+		wg:       &wg,
+		messages: incoming,
+	}
+	wg.Add(1)
+
+	go func() {
+		wg.Wait()
+		close(receiversDone)
+	}()
+	go recv.run(c.ctx, c.channel)
+
+	defer func() {
+		c.conn.Close()
+		c.userCloseFunc()
+	}()
 
 	for {
 		select {
 		case call := <-calls:
-			if err := c.send(call.ctx, streamID, messageTypeRequest, call.req); err != nil {
+			if err := c.send(streamID, messageTypeRequest, call.req); err != nil {
 				call.errs <- err
 				continue
 			}
@@ -219,41 +272,42 @@ func (c *Client) run() {
 
 			call.errs <- c.recv(call.resp, msg)
 			delete(waiters, msg.StreamID)
-		case <-shutdown:
-			if shutdownErr != nil {
-				shutdownErr = filterCloseErr(shutdownErr)
-			} else {
-				shutdownErr = ErrClosed
-			}
-
-			shutdownErr = errors.Wrapf(shutdownErr, "ttrpc: client shutting down")
-
-			c.err = shutdownErr
-			for _, waiter := range waiters {
-				waiter.errs <- shutdownErr
+		case <-receiversDone:
+			// all the receivers have exited
+			if recv.err != nil {
+				c.setError(recv.err)
 			}
+			// don't return out, let the close of the context trigger the abort of waiters
 			c.Close()
-			return
-		case <-c.closed:
-			if c.err == nil {
-				c.err = ErrClosed
-			}
-			// broadcast the shutdown error to the remaining waiters.
-			for _, waiter := range waiters {
-				waiter.errs <- c.err
-			}
+		case <-c.ctx.Done():
+			abortWaiters(c.error())
 			return
 		}
 	}
 }
 
-func (c *Client) send(ctx context.Context, streamID uint32, mtype messageType, msg interface{}) error {
+func (c *Client) error() error {
+	c.errOnce.Do(func() {
+		if c.err == nil {
+			c.err = ErrClosed
+		}
+	})
+	return c.err
+}
+
+func (c *Client) setError(err error) {
+	c.errOnce.Do(func() {
+		c.err = err
+	})
+}
+
+func (c *Client) send(streamID uint32, mtype messageType, msg interface{}) error {
 	p, err := c.codec.Marshal(msg)
 	if err != nil {
 		return err
 	}
 
-	return c.channel.send(ctx, streamID, mtype, p)
+	return c.channel.send(streamID, mtype, p)
 }
 
 func (c *Client) recv(resp *Response, msg *message) error {
@@ -274,22 +328,21 @@ func (c *Client) recv(resp *Response, msg *message) error {
 //
 // This purposely ignores errors with a wrapped cause.
 func filterCloseErr(err error) error {
-	if err == nil {
+	switch {
+	case err == nil:
 		return nil
-	}
-
-	if err == io.EOF {
+	case err == io.EOF:
 		return ErrClosed
-	}
-
-	if strings.Contains(err.Error(), "use of closed network connection") {
+	case errors.Cause(err) == io.EOF:
 		return ErrClosed
-	}
-
-	// if we have an epipe on a write, we cast to errclosed
-	if oerr, ok := err.(*net.OpError); ok && oerr.Op == "write" {
-		if serr, ok := oerr.Err.(*os.SyscallError); ok && serr.Err == syscall.EPIPE {
-			return ErrClosed
+	case strings.Contains(err.Error(), "use of closed network connection"):
+		return ErrClosed
+	default:
+		// if we have an epipe on a write, we cast to errclosed
+		if oerr, ok := err.(*net.OpError); ok && oerr.Op == "write" {
+			if serr, ok := oerr.Err.(*os.SyscallError); ok && serr.Err == syscall.EPIPE {
+				return ErrClosed
+			}
 		}
 	}