Synchronize world chunk index updates

mosfet/world.py

@@ -60,7 +60,11 @@ class World:
     def find_signs(self, center, distance=16):
         """Return nearby loaded signs as position/side/four-lines records."""
         result = []
-        for position, entity in self.g.chunks.block_entities.items():
+        chunks = self.g.chunks
+        entities = (chunks.block_entities_snapshot()
+                    if hasattr(chunks, 'block_entities_snapshot') else
+                    dict(chunks.block_entities))
+        for position, entity in entities.items():
             if utils.phyp(center, position) > distance:
                 continue
             get_block_at = getattr(self.g.chunks, 'get_block_at', None)
@@ -348,9 +352,13 @@ class World:
                 yield check
 
     def find_blocks_indexed(self, center, block_ids, distance=0):
-        index = []
-        for bid in block_ids:
-            index.extend(self.g.chunks.index.get(bid, []))
+        chunks = self.g.chunks
+        if hasattr(chunks, 'indexed_positions'):
+            index = chunks.indexed_positions(block_ids)
+        else:
+            index = []
+            for bid in block_ids:
+                index.extend(chunks.index.get(bid, []))
 
         result = []
         for block in index: