Adds storage driver interface, tests, and two basic implementations

storagedriver/ipc/ipc.go

@@ -0,0 +1,83 @@
+package ipc
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"reflect"
+
+	"github.com/docker/libchan"
+)
+
+type Request struct {
+	Type            string
+	Parameters      map[string]interface{}
+	ResponseChannel libchan.Sender
+}
+
+type noWriteReadWriteCloser struct {
+	io.ReadCloser
+}
+
+func (r noWriteReadWriteCloser) Write(p []byte) (n int, err error) {
+	return 0, errors.New("Write unsupported")
+}
+
+func WrapReadCloser(readCloser io.ReadCloser) io.ReadWriteCloser {
+	return noWriteReadWriteCloser{readCloser}
+}
+
+type responseError struct {
+	Type    string
+	Message string
+}
+
+func ResponseError(err error) *responseError {
+	if err == nil {
+		return nil
+	}
+	return &responseError{
+		Type:    reflect.TypeOf(err).String(),
+		Message: err.Error(),
+	}
+}
+
+func (err *responseError) Error() string {
+	return fmt.Sprintf("%s: %s", err.Type, err.Message)
+}
+
+type GetContentResponse struct {
+	Content []byte
+	Error   *responseError
+}
+
+type PutContentResponse struct {
+	Error *responseError
+}
+
+type ReadStreamResponse struct {
+	Reader io.ReadWriteCloser
+	Error  *responseError
+}
+
+type WriteStreamResponse struct {
+	Error *responseError
+}
+
+type ResumeWritePositionResponse struct {
+	Position uint64
+	Error    *responseError
+}
+
+type ListResponse struct {
+	Keys  []string
+	Error *responseError
+}
+
+type MoveResponse struct {
+	Error *responseError
+}
+
+type DeleteResponse struct {
+	Error *responseError
+}