Have task coros handle cancelled exceptions

server/block_processor.py

@@ -91,6 +91,8 @@ class Prefetcher(LoggedClass):
                     await asyncio.sleep(0)
             except DaemonError as e:
                 self.logger.info('ignoring daemon error: {}'.format(e))
+            except asyncio.CancelledError:
+                break
 
     async def _caught_up(self):
         '''Poll for new blocks and mempool state.

server/irc.py

@@ -51,6 +51,12 @@ class IRC(LoggedClass):
         self.peers = {}
 
     async def start(self):
+        try:
+            await self.join()
+        except asyncio.CancelledError:
+            pass
+
+    async def join(self):
         import irc.client as irc_client
 
         self.logger.info('joining IRC with nick "{}" and real name "{}"'

server/protocol.py

@@ -235,8 +235,10 @@ class Session(JSONRPC):
                 secs = time.time() - start
                 if secs > 1:
                     self.logger.warning('slow request for {} took {:.1f}s: {}'
-                                        .format(session.peername(), secs,
+                                        .format(self.peername(), secs,
                                                 request))
+            except asyncio.CancelledError:
+                break
             except Exception:
                 # Getting here should probably be considered a bug and fixed
                 self.logger.error('error handling request {}'.format(request))