Do not consume async gens, turn them to gens instead

pyrogram/sync.py

@@ -30,8 +30,23 @@ def async_to_sync(obj, name):
     function = getattr(obj, name)
     main_loop = asyncio.get_event_loop()
 
-    async def consume_generator(coroutine):
-        return types.List([i async for i in coroutine])
+    def async_to_sync_gen(agen, loop, is_main_thread):
+        async def anext(agen):
+            try:
+                return await agen.__anext__(), False
+            except StopAsyncIteration:
+                return None, True
+
+        while True:
+            if is_main_thread:
+                item, done = loop.run_until_complete(anext(agen))
+            else:
+                item, done = asyncio.run_coroutine_threadsafe(anext(agen), loop).result()
+
+            if done:
+                break
+
+            yield item
 
     @functools.wraps(function)
     def async_to_sync_wrap(*args, **kwargs):
@@ -51,7 +66,7 @@ def async_to_sync(obj, name):
                     return loop.run_until_complete(coroutine)
 
                 if inspect.isasyncgen(coroutine):
-                    return loop.run_until_complete(consume_generator(coroutine))
+                    return async_to_sync_gen(coroutine, loop, True)
         else:
             if inspect.iscoroutine(coroutine):
                 if loop.is_running():
@@ -66,7 +81,7 @@ def async_to_sync(obj, name):
                 if loop.is_running():
                     return coroutine
                 else:
-                    return asyncio.run_coroutine_threadsafe(consume_generator(coroutine), main_loop).result()
+                    return async_to_sync_gen(coroutine, main_loop, False)
 
     setattr(obj, name, async_to_sync_wrap)