Merge pull request 'Feature: 创建启动通知' (#53) from feature/startup-notification into master

Reviewed-on: #53

konabot/plugins/startup_notify.py

@@ -0,0 +1,33 @@
+import asyncio
+from nonebot import get_driver
+from nonebot_plugin_alconna import UniMessage
+from konabot.plugins.poster.poster_info import register_poster_info, PosterInfo
+from konabot.plugins.poster.service import broadcast
+
+
+CHANNEL_STARTUP = "启动通知"
+
+
+register_poster_info(CHANNEL_STARTUP, PosterInfo(
+    aliases=set(),
+    description="当 Bot 重启时告知",
+))
+
+driver = get_driver()
+
+@driver.on_startup
+async def _():
+    # 要尽量保证接受讯息的服务存在
+    # 所以在这里我们要等待一定时间后再发信
+    async def task():
+        while True:
+            if len(driver.bots) >= 1:
+                break
+            await asyncio.sleep(15)
+
+        # 在这个时候，需求的 bot 已经上线，再等待一小会
+        await asyncio.sleep(3)
+        await broadcast(CHANNEL_STARTUP, UniMessage.text("此方 BOT 重启好了"))
+
+    asyncio.create_task(task())
+