initial
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LockeShor
326
watcher.py
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326
watcher.py
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import hashlib
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import json
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import logging
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import os
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import sys
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import time
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from dataclasses import dataclass, asdict
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from datetime import datetime, timezone
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from typing import Dict, List, Tuple
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from urllib.parse import urljoin, urlparse
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import requests
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from bs4 import BeautifulSoup
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CATALOG_URL = os.getenv("CATALOG_URL", "https://apps.truenas.com/catalog")
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STATE_PATH = os.getenv("STATE_PATH", "/data/catalog_state.json")
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CHECK_INTERVAL_SECONDS = int(os.getenv("CHECK_INTERVAL_SECONDS", "1800"))
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TELEGRAM_BOT_TOKEN = os.getenv("TELEGRAM_BOT_TOKEN", "")
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TELEGRAM_CHAT_ID = os.getenv("TELEGRAM_CHAT_ID", "")
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REQUEST_TIMEOUT_SECONDS = int(os.getenv("REQUEST_TIMEOUT_SECONDS", "30"))
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USER_AGENT = os.getenv(
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"USER_AGENT",
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"truenas-catalog-notify/1.0 (+https://apps.truenas.com/catalog)",
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)
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LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()
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MAX_MESSAGE_LEN = 3900
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@dataclass
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class AppSnapshot:
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name: str
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url: str
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train: str
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added: str
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summary: str
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content_hash: str
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def configure_logging() -> None:
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logging.basicConfig(
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level=getattr(logging, LOG_LEVEL, logging.INFO),
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format="%(asctime)s %(levelname)s %(message)s",
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)
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def normalize_text(value: str) -> str:
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return " ".join(value.split())
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def compute_hash(parts: List[str]) -> str:
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digest = hashlib.sha256("||".join(parts).encode("utf-8")).hexdigest()
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return digest
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def fetch_catalog_html(session: requests.Session) -> str:
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response = session.get(
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CATALOG_URL,
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timeout=REQUEST_TIMEOUT_SECONDS,
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headers={"User-Agent": USER_AGENT},
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)
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response.raise_for_status()
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return response.text
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def is_catalog_app_link(href: str) -> bool:
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if not href:
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return False
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parsed = urlparse(href)
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path = parsed.path.rstrip("/")
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return path.startswith("/catalog/") and path != "/catalog"
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def parse_catalog(html: str) -> Dict[str, AppSnapshot]:
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soup = BeautifulSoup(html, "html.parser")
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cards_root = soup.find(id="catalog-cards")
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candidates = cards_root.find_all("a", href=True) if cards_root else soup.find_all("a", href=True)
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snapshots: Dict[str, AppSnapshot] = {}
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for anchor in candidates:
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raw_href = anchor.get("href", "")
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full_url = urljoin(CATALOG_URL, raw_href)
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if not is_catalog_app_link(urlparse(full_url).path):
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continue
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text = normalize_text(anchor.get_text(" ", strip=True))
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if not text:
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continue
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name = text.split(" Train:")[0].strip()
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train = ""
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added = ""
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summary = ""
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if " Train:" in text:
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remainder = text.split(" Train:", 1)[1].strip()
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if " Added:" in remainder:
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train_part, after_added = remainder.split(" Added:", 1)
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train = train_part.strip()
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pieces = after_added.split(" ", 1)
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added = pieces[0].strip()
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summary = pieces[1].strip() if len(pieces) > 1 else ""
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else:
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train = remainder
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else:
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summary = text
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app_hash = compute_hash([name, train, added, summary, full_url])
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snapshots[full_url] = AppSnapshot(
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name=name,
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url=full_url,
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train=train,
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added=added,
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summary=summary,
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content_hash=app_hash,
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)
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return snapshots
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def load_state(path: str) -> Dict[str, AppSnapshot]:
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if not os.path.exists(path):
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return {}
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with open(path, "r", encoding="utf-8") as handle:
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data = json.load(handle)
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apps = data.get("apps", {})
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loaded: Dict[str, AppSnapshot] = {}
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for url, value in apps.items():
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loaded[url] = AppSnapshot(
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name=value.get("name", ""),
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url=value.get("url", url),
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train=value.get("train", ""),
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added=value.get("added", ""),
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summary=value.get("summary", ""),
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content_hash=value.get("content_hash", ""),
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)
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return loaded
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def save_state(path: str, apps: Dict[str, AppSnapshot]) -> None:
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directory = os.path.dirname(path)
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if directory:
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os.makedirs(directory, exist_ok=True)
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payload = {
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"updated_at": datetime.now(timezone.utc).isoformat(),
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"apps": {url: asdict(snapshot) for url, snapshot in sorted(apps.items())},
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}
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with open(path, "w", encoding="utf-8") as handle:
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json.dump(payload, handle, indent=2, ensure_ascii=False)
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def format_field_change(label: str, old: str, new: str) -> str:
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old_clean = old if old else "(empty)"
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new_clean = new if new else "(empty)"
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return f"{label}: '{old_clean}' -> '{new_clean}'"
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def build_diff_message(
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previous: Dict[str, AppSnapshot],
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current: Dict[str, AppSnapshot],
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) -> Tuple[str, List[str], int]:
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prev_urls = set(previous.keys())
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curr_urls = set(current.keys())
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added_urls = sorted(curr_urls - prev_urls)
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removed_urls = sorted(prev_urls - curr_urls)
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common_urls = sorted(curr_urls & prev_urls)
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changed_lines: List[str] = []
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updated_count = 0
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for url in common_urls:
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old = previous[url]
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new = current[url]
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if old.content_hash == new.content_hash:
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continue
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updated_count += 1
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details: List[str] = []
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if old.name != new.name:
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details.append(format_field_change("name", old.name, new.name))
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if old.train != new.train:
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details.append(format_field_change("train", old.train, new.train))
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if old.added != new.added:
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details.append(format_field_change("added", old.added, new.added))
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if old.summary != new.summary:
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details.append(format_field_change("summary", old.summary, new.summary))
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if not details:
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details.append("metadata changed")
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changed_lines.append(f"~ {new.name} ({new.url})")
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for detail in details:
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changed_lines.append(f" - {detail}")
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header = (
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f"TrueNAS catalog changed at {datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S UTC')}\n"
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f"Added: {len(added_urls)} | Removed: {len(removed_urls)} | Updated: {updated_count}"
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)
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lines: List[str] = []
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for url in added_urls:
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app = current[url]
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lines.append(f"+ {app.name} ({app.url})")
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for url in removed_urls:
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app = previous[url]
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lines.append(f"- {app.name} ({app.url})")
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lines.extend(changed_lines)
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return header, lines, updated_count
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def split_message(header: str, lines: List[str], max_len: int = MAX_MESSAGE_LEN) -> List[str]:
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if not lines:
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return [header]
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chunks: List[str] = []
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current_chunk = header
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for line in lines:
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candidate = f"{current_chunk}\n{line}"
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if len(candidate) <= max_len:
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current_chunk = candidate
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continue
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chunks.append(current_chunk)
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current_chunk = f"{header}\n{line}"
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chunks.append(current_chunk)
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return chunks
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def send_telegram_message(session: requests.Session, text: str) -> None:
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if not TELEGRAM_BOT_TOKEN or not TELEGRAM_CHAT_ID:
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logging.warning("Telegram token/chat id missing; skipping message")
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return
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endpoint = f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage"
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payload = {
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"chat_id": TELEGRAM_CHAT_ID,
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"text": text,
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"disable_web_page_preview": True,
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}
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response = session.post(endpoint, json=payload, timeout=REQUEST_TIMEOUT_SECONDS)
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response.raise_for_status()
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def send_startup_notification(session: requests.Session) -> None:
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message = (
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"TrueNAS catalog watcher is running ✅\n"
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f"Started: {datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S UTC')}\n"
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f"Catalog: {CATALOG_URL}\n"
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f"Interval: {CHECK_INTERVAL_SECONDS}s"
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)
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try:
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send_telegram_message(session, message)
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except requests.RequestException as exc:
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logging.error("Failed to send startup Telegram message: %s", exc)
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def run_once(session: requests.Session, first_run: bool) -> bool:
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previous_state = load_state(STATE_PATH)
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html = fetch_catalog_html(session)
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current_state = parse_catalog(html)
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if not current_state:
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raise RuntimeError("Parsed zero catalog entries; aborting to avoid overwriting state")
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if first_run and not previous_state:
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save_state(STATE_PATH, current_state)
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logging.info("Initial snapshot saved with %d apps", len(current_state))
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return False
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header, diff_lines, _ = build_diff_message(previous_state, current_state)
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changed = bool(diff_lines)
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if changed:
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logging.info("Catalog change detected with %d line items", len(diff_lines))
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for message in split_message(header, diff_lines):
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send_telegram_message(session, message)
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else:
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logging.info("No catalog changes detected")
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save_state(STATE_PATH, current_state)
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return changed
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def validate_env() -> None:
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if CHECK_INTERVAL_SECONDS < 30:
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raise ValueError("CHECK_INTERVAL_SECONDS must be >= 30")
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def main() -> int:
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configure_logging()
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try:
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validate_env()
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except Exception as exc:
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logging.error("Invalid environment: %s", exc)
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return 2
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logging.info("Starting TrueNAS catalog watcher")
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logging.info("Catalog URL: %s", CATALOG_URL)
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logging.info("State file: %s", STATE_PATH)
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logging.info("Interval: %ss", CHECK_INTERVAL_SECONDS)
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session = requests.Session()
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send_startup_notification(session)
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first_loop = True
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while True:
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try:
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run_once(session, first_loop)
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except requests.RequestException as exc:
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logging.error("Network error: %s", exc)
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except Exception as exc:
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logging.exception("Watcher iteration failed: %s", exc)
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first_loop = False
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time.sleep(CHECK_INTERVAL_SECONDS)
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if __name__ == "__main__":
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sys.exit(main())
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