Start fleshing out basic Client types from Go-NEB

sync.go

@@ -0,0 +1,35 @@
+package gomatrix
+
+// NextBatchStorer controls loading/saving of next_batch tokens for users
+type NextBatchStorer interface {
+	// Save a next_batch token for a given user. Best effort.
+	Save(userID, nextBatch string)
+	// Load a next_batch token for a given user. Return an empty string if no token exists.
+	Load(userID string) string
+}
+
+// NopNextBatchStore does not load or save next_batch tokens.
+type NopNextBatchStore struct{}
+
+// Save does nothing
+func (s NopNextBatchStore) Save(userID, nextBatch string) {}
+
+// Load does nothing
+func (s NopNextBatchStore) Load(userID string) string { return "" }
+
+// FilterStorer controls loading/saving of filter IDs for users
+type FilterStorer interface {
+	// Save a filter ID for a given user. Best effort.
+	Save(userID, filterID string)
+	// Load a filter ID for a given user. Return an empty string if no token exists.
+	Load(userID string) string
+}
+
+// NopFilterStore does not load or save filter IDs.
+type NopFilterStore struct{}
+
+// Save does nothing
+func (s NopFilterStore) Save(userID, filterID string) {}
+
+// Load does nothing
+func (s NopFilterStore) Load(userID string) string { return "" }