chats/ChatProcess.py

@@ -2,15 +2,20 @@ from abc import ABC, abstractmethod
 from multiprocessing import Process, Pipe, Queue
 from aenum import Enum, auto
 from traceback import format_exception
+import time
 
 
+class GracefulShutdownException(Exception):
+    pass
+
 class LIFECYCLE_MESSAGES(Enum):
     SHUTDOWN = auto()
 
-
 class ChatProcess(Process, ABC):
-    def __init__(self):
+    def __init__(self, event_poll_frequency):
         super().__init__()
+        self._event_poll_frequency = event_poll_frequency
+
         self._message_queue = Queue()
         self._pipe, self._caller_pipe = Pipe()
 
@@ -83,22 +88,38 @@ class ChatProcess(Process, ABC):
                 else:
                     self.state = response
 
-                if self._pipe.poll(timeout):
+                while timeout is None or timeout > 0:
+                    if timeout is None:
+                        period = self._event_poll_frequency
+                    else:
+                        period = min(self._event_poll_frequency, timeout)
+                    if self._pipe.poll():
                         incoming_message = self._pipe.recv()
                         if incoming_message['type'] == LIFECYCLE_MESSAGES.SHUTDOWN:
-                        break
+                            raise GracefulShutdownException()
                         message_type = incoming_message['type']
                         args = {k: v for k, v in incoming_message.items() if k != 'type'}
                         response = self.process_messages(message_type, args, self._next_state)
                         if response is None:
-                        pass
+                            continue
                         elif type(response) is tuple:
                             self.state, self._next_state = response
                         else:
                             self.state = response
 
+                        if timeout is None:
+                            timeout = 0
+                    time.sleep(period)
+                    if timeout is not None:
+                        timeout -= period
+
+                if timeout is not None and timeout > 0:
+                    time.sleep(timeout)
+
+
+        except GracefulShutdownException:
+            return 0
         except Exception as e:
             print(f'Failure in {self.__class__.__name__}: {e}')
             print(''.join(format_exception(None, e, e.__traceback__)))
             return -1
-        return 0

chats/FakeChat.py

@@ -12,24 +12,32 @@ class CONTROL_MESSAGES(Enum):
     START_STOP = auto()
 
 
+class STATES(Enum):
+    PAUSED = auto()
+    RUNNING = auto()
+
+
 class FakeChat(ChatProcess):
-    def __init__(self):
-        super().__init__()
+    def __init__(self, *args):
+        super().__init__(*args)
         self._max_messages_per_chunk = 1
         self._max_delay = 10
-        self._running = False
 
     def process_messages(self, message_type, args, next_state):
         if message_type == CONTROL_MESSAGES.START_STOP:
-            self._running = not self._running
-            text = 'Fake chat activated!' if self._running else 'Disabled fake chat'
+            running = not self.state == STATES.RUNNING
+            text = 'Fake chat activated!' if running else 'Disabled fake chat'
             self._message_queue.put({
                 'text': text,
                 'author_name': 'Fake Chat', 'author_id': self.__class__.__name__, 'author_type': AUTHOR_TYPES.SYSTEM
             })
 
+            return STATES.RUNNING if running else STATES.PAUSED
+
     def loop(self, next_state):
-        if not self._running:
+        if self.state is None:
+            return STATES.PAUSED
+        elif self.state == STATES.PAUSED:
             return None
 
         while range(int(random.random() * (self._max_messages_per_chunk + 1))):

chats/YoutubeLive.py

@@ -27,8 +27,8 @@ class YoutubeLiveProcess(ChatProcess):
     GOOGLE_OAUTH_TOKEN_URL = 'https://accounts.google.com/o/oauth2/token'
     YOUTUBE_API_URL = 'https://www.googleapis.com/youtube/v3'
 
-    def __init__(self, client_secrets):
-        super().__init__()
+    def __init__(self, client_secrets, *args):
+        super().__init__(*args)
         self._client_secrets = client_secrets
         self._state_machine = self.bind_to_states(STATES)
 

main.py

@@ -1,21 +1,21 @@
 import json
 import os
+import time
 
 from chats import YoutubeLive
 from chats.ChatProcess import LIFECYCLE_MESSAGES
 from chats.FakeChat import FakeChat
 from ui.App import App
 
-
+EVENT_POLL_FREQ = 0.1
 GOOGLE_API_SECRETS_PATH = 'googleapi.secret.json'
 
 if __name__ == '__main__':
-    chat_processes = [FakeChat()]
+    chat_processes = [FakeChat(EVENT_POLL_FREQ)]
     if os.path.exists(GOOGLE_API_SECRETS_PATH):
         with open(GOOGLE_API_SECRETS_PATH, 'r') as f:
             client_secrets = json.load(f)['installed']
-
-        chat_processes.append(YoutubeLive.YoutubeLiveProcess(client_secrets))
+        chat_processes.append(YoutubeLive.YoutubeLiveProcess(client_secrets, EVENT_POLL_FREQ))
     else:
         print('No client secrets - disabling youtube chat client. Hit "f" to enable a testing client')
 
@@ -37,6 +37,7 @@ if __name__ == '__main__':
                         'type': YoutubeLive.CONTROL_MESSAGES.OAUTH_CONSENT_TOKEN,
                         'token': code
                     })
+        time.sleep(EVENT_POLL_FREQ)
 
     for process in chat_processes:
         process.control_pipe.send({'type': LIFECYCLE_MESSAGES.SHUTDOWN})