Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/github.com/ncw/swift/timeout_reader.go

@@ -0,0 +1,57 @@
+package swift
+
+import (
+	"io"
+	"time"
+)
+
+// An io.ReadCloser which obeys an idle timeout
+type timeoutReader struct {
+	reader  io.ReadCloser
+	timeout time.Duration
+	cancel  func()
+}
+
+// Returns a wrapper around the reader which obeys an idle
+// timeout. The cancel function is called if the timeout happens
+func newTimeoutReader(reader io.ReadCloser, timeout time.Duration, cancel func()) *timeoutReader {
+	return &timeoutReader{
+		reader:  reader,
+		timeout: timeout,
+		cancel:  cancel,
+	}
+}
+
+// Read reads up to len(p) bytes into p
+//
+// Waits at most for timeout for the read to complete otherwise returns a timeout
+func (t *timeoutReader) Read(p []byte) (int, error) {
+	// FIXME limit the amount of data read in one chunk so as to not exceed the timeout?
+	// Do the read in the background
+	type result struct {
+		n   int
+		err error
+	}
+	done := make(chan result, 1)
+	go func() {
+		n, err := t.reader.Read(p)
+		done <- result{n, err}
+	}()
+	// Wait for the read or the timeout
+	select {
+	case r := <-done:
+		return r.n, r.err
+	case <-time.After(t.timeout):
+		t.cancel()
+		return 0, TimeoutError
+	}
+	panic("unreachable") // for Go 1.0
+}
+
+// Close the channel
+func (t *timeoutReader) Close() error {
+	return t.reader.Close()
+}
+
+// Check it satisfies the interface
+var _ io.ReadCloser = &timeoutReader{}