lib/model, lib/protocol: Handle request concurrency in model (#5216)

lib/protocol/common_test.go

@@ -9,7 +9,7 @@ type TestModel struct {
 	folder        string
 	name          string
 	offset        int64
-	size          int
+	size          int32
 	hash          []byte
 	weakHash      uint32
 	fromTemporary bool
@@ -29,16 +29,17 @@ func (t *TestModel) Index(deviceID DeviceID, folder string, files []FileInfo) {
 func (t *TestModel) IndexUpdate(deviceID DeviceID, folder string, files []FileInfo) {
 }
 
-func (t *TestModel) Request(deviceID DeviceID, folder, name string, offset int64, hash []byte, weakHash uint32, fromTemporary bool, buf []byte) error {
+func (t *TestModel) Request(deviceID DeviceID, folder, name string, size int32, offset int64, hash []byte, weakHash uint32, fromTemporary bool) (RequestResponse, error) {
 	t.folder = folder
 	t.name = name
 	t.offset = offset
-	t.size = len(buf)
+	t.size = size
 	t.hash = hash
 	t.weakHash = weakHash
 	t.fromTemporary = fromTemporary
+	buf := make([]byte, len(t.data))
 	copy(buf, t.data)
-	return nil
+	return &fakeRequestResponse{buf}, nil
 }
 
 func (t *TestModel) Closed(conn Connection, err error) {
@@ -60,3 +61,15 @@ func (t *TestModel) closedError() error {
 		return nil // Timeout
 	}
 }
+
+type fakeRequestResponse struct {
+	data []byte
+}
+
+func (r *fakeRequestResponse) Data() []byte {
+	return r.data
+}
+
+func (r *fakeRequestResponse) Close() {}
+
+func (r *fakeRequestResponse) Wait() {}