implement a functioning scheduler, get rid of threads

pgbotlib/cron.py

@@ -0,0 +1,32 @@
+import time
+import random
+
+import yaml
+import aiocron
+import telethon
+import pgbotlib.response
+
+
+class Cron:
+    def __init__(self,
+                 config: dict,
+                 client: telethon.TelegramClient,
+                 responder: pgbotlib.response.Responder) -> None:
+        with open(config['schedule'], 'r', encoding='utf-8') as data:
+            self.sched = yaml.safe_load(data.read())
+            self.responder = responder
+            self.client = client
+
+    def __mkjob(self, job: dict) -> callable:
+        tokens = frozenset(job['tokens'].split(','))
+        async def send_message() -> None:
+            if 'rand' in job:
+                time.sleep(random.randint(0, job['rand']) * 60)
+            message = self.responder.get_response(tokens)
+            message = self.responder.api_match(message, '')
+            await self.client.send_message(job['chat'], message)
+        return send_message
+
+    def plan(self) -> None:
+        for job in self.sched:
+            aiocron.crontab(job['cron'], func=self.__mkjob(job))