init

bot/services/fetcher.py

@@ -0,0 +1,43 @@
+import logging
+
+from telethon import TelegramClient
+from telethon.tl.functions.channels import GetFullChannelRequest
+
+from bot.models import ChannelMessage
+
+log = logging.getLogger(__name__)
+
+
+async def fetch_channel_messages(
+    client: TelegramClient,
+    channel: str,
+    limit: int | None = None,
+) -> tuple[list[ChannelMessage], dict]:
+    """Fetch messages and basic stats from a public channel."""
+    entity = await client.get_entity(channel)
+    full = await client(GetFullChannelRequest(entity))
+
+    stats = {
+        "title": entity.title,
+        "username": getattr(entity, "username", None),
+        "subscribers": full.full_chat.participants_count,
+    }
+
+    messages: list[ChannelMessage] = []
+    async for msg in client.iter_messages(entity, limit=limit):
+        if not msg.text:
+            continue
+        messages.append(
+            ChannelMessage(
+                id=msg.id,
+                date=msg.date,
+                text=msg.text,
+                views=msg.views,
+                forwards=msg.forwards,
+                replies=msg.replies.replies if msg.replies else None,
+            )
+        )
+
+    messages.reverse()
+    log.info("Fetched %d text messages from %s", len(messages), channel)
+    return messages, stats