support clean exit

lbry/blockchain/database.py

@@ -51,7 +51,7 @@ class BlockchainDB:
         self.executor: Optional[ThreadPoolExecutor] = None
 
     async def run_in_executor(self, *args):
-        return await asyncio.get_event_loop().run_in_executor(self.executor, *args)
+        return await asyncio.get_running_loop().run_in_executor(self.executor, *args)
 
     def sync_open(self):
         self.connection = sqlite3.connect(

lbry/blockchain/lbrycrd.py

@@ -179,10 +179,11 @@ class Lbrycrd:
 
     async def close(self):
         await self.db.close()
+        if self.session is not None:
             await self.session.close()
 
     async def start(self, *args):
-        loop = asyncio.get_event_loop()
+        loop = asyncio.get_running_loop()
         command = self.get_start_command(*args)
         log.info(' '.join(command))
         self.transport, self.protocol = await loop.subprocess_exec(Process, *command)

lbry/db/database.py

@@ -141,7 +141,7 @@ class Database:
         db.execute(text(f"CREATE DATABASE {name}"))
 
     async def create(self, name):
-        return await asyncio.get_event_loop().run_in_executor(None, self.sync_create, name)
+        return await asyncio.get_running_loop().run_in_executor(None, self.sync_create, name)
 
     def sync_drop(self, name):
         engine = create_engine(self.url)
@@ -150,7 +150,7 @@ class Database:
         db.execute(text(f"DROP DATABASE IF EXISTS {name}"))
 
     async def drop(self, name):
-        return await asyncio.get_event_loop().run_in_executor(None, self.sync_drop, name)
+        return await asyncio.get_running_loop().run_in_executor(None, self.sync_drop, name)
 
     async def open(self):
         assert self.executor is None, "Database already open."
@@ -175,11 +175,17 @@ class Database:
                 await self.run(uninitialize)
             self.executor.shutdown()
             self.executor = None
+            # fixes "OSError: handle is closed"
+            # seems to only happen when running in PyCharm
+            # https://github.com/python/cpython/pull/6084#issuecomment-564585446
+            # TODO: delete this in Python 3.8/3.9?
+            from concurrent.futures.process import _threads_wakeups
+            _threads_wakeups.clear()
 
     async def run(self, func, *args, **kwargs):
         if kwargs:
             clean_wallet_account_ids(kwargs)
-        return await asyncio.get_event_loop().run_in_executor(
+        return await asyncio.get_running_loop().run_in_executor(
             self.executor, partial(func, *args, **kwargs)
         )
 

lbry/event.py

@@ -149,7 +149,7 @@ class EventStream:
 
     @property
     def first(self) -> asyncio.Future:
-        future = asyncio.get_event_loop().create_future()
+        future = asyncio.get_running_loop().create_future()
         subscription = self.listen(
             lambda value: not future.done() and self._cancel_and_callback(subscription, future, value),
             lambda exception: not future.done() and self._cancel_and_error(subscription, future, exception)
@@ -158,7 +158,7 @@ class EventStream:
 
     @property
     def last(self) -> asyncio.Future:
-        future = asyncio.get_event_loop().create_future()
+        future = asyncio.get_running_loop().create_future()
         value = None
 
         def update_value(_value):
@@ -237,6 +237,7 @@ class EventQueuePublisher(threading.Thread):
 
     def stop(self):
         self.queue.put(self.STOP)
+        if self.is_alive():
             self.join()
 
     def __enter__(self):

lbry/file_analysis.py

@@ -54,11 +54,11 @@ class VideoFileAnalyzer:
     # We work around that issue here by using run_in_executor. Check it again in Python 3.8.
     async def _execute_ffmpeg(self, arguments):
         arguments = self._which_ffmpeg + " " + arguments
-        return await asyncio.get_event_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
+        return await asyncio.get_running_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
 
     async def _execute_ffprobe(self, arguments):
         arguments = self._which_ffprobe + " " + arguments
-        return await asyncio.get_event_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
+        return await asyncio.get_running_loop().run_in_executor(None, self._execute, arguments, self._env_copy)
 
     async def _verify_executables(self):
         try:

lbry/service/api.py

@@ -2922,7 +2922,7 @@ class API:
 
         """
 
-        blob = await download_blob(asyncio.get_event_loop(), self.conf, self.blob_manager, self.dht_node, blob_hash)
+        blob = await download_blob(asyncio.get_running_loop(), self.conf, self.blob_manager, self.dht_node, blob_hash)
         if read:
             with blob.reader_context() as handle:
                 return handle.read().decode()

lbry/service/daemon.py

@@ -1,9 +1,11 @@
 import json
+import signal
 import asyncio
 import logging
-import signal
+
 from weakref import WeakSet
-from aiohttp.web import GracefulExit
+from asyncio.runners import _cancel_all_tasks
+
 from aiohttp.web import Application, AppRunner, WebSocketResponse, TCPSite, Response
 from aiohttp.http_websocket import WSMsgType, WSCloseCode
 
@@ -13,6 +15,9 @@ from lbry.service.api import API
 from lbry.console import Console
 
 
+log = logging.getLogger(__name__)
+
+
 def jsonrpc_dumps_pretty(obj, **kwargs):
     #if not isinstance(obj, dict):
     #    data = {"jsonrpc": "2.0", "error": obj.to_dict()}
@@ -84,28 +89,21 @@ class Daemon:
         self.runner = AppRunner(self.app)
 
     def run(self):
-        loop = asyncio.get_event_loop()
-
-        def graceful_exit():
-            raise GracefulExit()
-
-        try:
-            loop.add_signal_handler(signal.SIGINT, graceful_exit)
-            loop.add_signal_handler(signal.SIGTERM, graceful_exit)
-        except NotImplementedError:
-            pass  # Not implemented on Windows
-
+        loop = asyncio.new_event_loop()
+        for sig in (signal.SIGHUP, signal.SIGTERM, signal.SIGINT):
+            loop.add_signal_handler(sig, loop.stop)
         try:
             loop.run_until_complete(self.start())
             loop.run_forever()
-        except (GracefulExit, KeyboardInterrupt, asyncio.CancelledError):
-            pass
         finally:
+            try:
                 loop.run_until_complete(self.stop())
-            logging.shutdown()
-
-        if hasattr(loop, 'shutdown_asyncgens'):
+            finally:
+                try:
+                    _cancel_all_tasks(loop)
                     loop.run_until_complete(loop.shutdown_asyncgens())
+                finally:
+                    loop.close()
 
     async def start(self):
         self.console.starting()

lbry/tasks.py

@@ -1,10 +1,10 @@
-from asyncio import Event, get_event_loop
+from asyncio import Event, get_running_loop
 
 
 class TaskGroup:
 
     def __init__(self, loop=None):
-        self._loop = loop or get_event_loop()
+        self._loop = loop or get_running_loop()
         self._tasks = set()
         self.done = Event()
         self.started = Event()

lbry/wallet/account.py

@@ -478,7 +478,7 @@ class Account:
                 continue
             if "-----BEGIN EC PRIVATE KEY-----" not in private_key_pem:
                 continue
-            public_key_der = await asyncio.get_event_loop().run_in_executor(None, to_der, private_key_pem)
+            public_key_der = await asyncio.get_running_loop().run_in_executor(None, to_der, private_key_pem)
             channel_keys[self.ledger.public_key_to_address(public_key_der)] = private_key_pem
         if self.channel_keys != channel_keys:
             self.channel_keys = channel_keys

tests/integration/service/test_daemon.py

@@ -0,0 +1,35 @@
+import os
+import time
+import asyncio
+import signal
+from threading import Thread
+from unittest import TestCase
+
+from lbry import Daemon, FullNode
+from lbry.console import Console
+from lbry.blockchain.lbrycrd import Lbrycrd
+
+
+class TestShutdown(TestCase):
+
+    def test_graceful_fail(self):
+        chain_loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(chain_loop)
+        chain = Lbrycrd.temp_regtest()
+        self.addCleanup(lambda: chain_loop.run_until_complete(chain.stop()))
+        self.addCleanup(lambda: asyncio.set_event_loop(chain_loop))
+        chain_loop.run_until_complete(chain.ensure())
+        chain_loop.run_until_complete(chain.start())
+        chain_loop.run_until_complete(chain.generate(1))
+        chain.ledger.conf.set(workers=2)
+        service = FullNode(chain.ledger)
+        daemon = Daemon(service, Console(service))
+
+        def send_signal():
+            time.sleep(2)
+            os.kill(os.getpid(), signal.SIGTERM)
+
+        thread = Thread(target=send_signal)
+        thread.start()
+
+        daemon.run()