YoursFunny/TelegramTwitterMediaBot
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fix: harden the debug command, link cache and rate limiter

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- commands: /bot_dict dumped the whole chat state to any member of the chat
  and could exceed Telegram's 4096-char message limit (the send then failed
  and bubbled up as a handler error). It is now admin-only and capped at
  MAX_DEBUG_DUMP_CHARS; README, README.en and the /help description updated.
- send: the edit-before-forward template buttons were built from a HashMap
  walk, so their order changed between prompts. Now sorted by name.
- link_cache: an unparseable payload (older schema) was reported as a miss
  but left in place, re-failing the parse on every later hit; the row is
  dropped on read.
- handlers: a link handed to the URL workers after the channel closed
  (shutdown) was discarded silently; it is now logged.
- rate_limit: LIMITERS kept one bucket per chat that ever sent media,
  forever. The periodic sweep now drops buckets that are idle (refilled to
  capacity) and not held by an in-flight sender; acquire's refill was
  factored into a shared helper used by the idle check.

Tests: +3 (corrupted row dropped, sorted markup, idle-bucket pruning); the
cache one was verified to fail before the fix. fmt/clippy clean, 55 + 69.
This commit is contained in:
YoursFunny
2026-09-16 21:16:14 +08:00
parent 0a577600fd
commit 475cfd18f9
8 changed files with 152 additions and 19 deletions
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README.en.md
+1 -1
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@@ -113,7 +113,7 @@ Telegram only accepts ports 443/80/88/8443.
| `/set_template <name>` | Reply to a message containing `[]` to save it as a named template; `[]` is replaced by the original post link when forwarding (used with "edit before forward") |
| `/set_format <site> <format>` | Customize the caption format for one site. Sites: `twitter` / `bsky` / `pixiv` / `misskey`. Placeholders: `{url}` `{author}` `{author_url}` `{title}` `{tags}` |
| `/clear_cache [link]` | Clear the link cache (admin only); with a link only that entry, otherwise everything |
| `/bot_dict` | Show the current chat state (debugging) |
| `/bot_dict` | Show the current chat state (debugging; admin only) |
| `/test <link>` | Debug: parse a link and report the parse result only (site, title, author, tags, media list) — no media is sent |
Link processing works only in private chats; commands work in any chat.