Display which peer dropped the connection

Require aiorpcx 0.20.2 which has TaskGroup improvements

Author: Neil Booth

electrumx/server/controller.py

@@ -86,8 +86,8 @@ async def serve(self, shutdown_event):
         '''Start the RPC server and wait for the mempool to synchronize.  Then
         start serving external clients.
         '''
-        if not (0, 20) <= aiorpcx_version < (0, 21):
-            raise RuntimeError('aiorpcX version 0.20 is required')
+        if not (0, 20, 2) <= aiorpcx_version < (0, 21):
+            raise RuntimeError('aiorpcX version 0.20.2+ is required')
 
         env = self.env
         min_str, max_str = env.coin.SESSIONCLS.protocol_min_max_strings()

electrumx/server/peers.py

@@ -258,7 +258,7 @@ async def _should_drop_peer(self, peer):
                 self.logger.info(f'{peer_text} {e}')
             except CancelledError:
                 # A send_request was cancelled
-                self.logger.error('peer dropped verification connection')
+                self.logger.error(f'{peer_text} dropped verification connection')
                 peer.mark_bad()
                 break
 
@@ -348,7 +348,7 @@ async def _verify_peer(self, session, peer):
                                        (session, peer))
 
         # Propagate failed task exception
-        g.result()
+        g.results    # pylint:disable=W0104
 
         # Process reported peers if remote peer is good
         peers = peers_task.result()