discover_fallback_ips() filtered out any DoH-resolved IP that also appeared
in the system resolver's answer set, on the assumption that the system IP
was unreachable. When DoH and system DNS agreed (a common case), the
function returned the hardcoded _SEED_FALLBACK_IPS list instead — and on
networks where those seed addresses are not routable, the Telegram fallback
transport had nothing usable to retry against and polling failed.
Drop the system_ips exclusion so DoH-confirmed IPs are preserved regardless
of system DNS overlap. The TelegramFallbackTransport already tries the
primary path first via system DNS, then falls through to the IP-rewrite
path on connect failure; including the same IP in both lanes lets a
transient primary failure recover via the explicit IP route instead of
escalating to seed addresses.
Update the two tests that codified the old exclusion to reflect the new,
inclusion-by-default behaviour.
Fixes#14520
Pass platform_env_var="TELEGRAM_PROXY" to resolve_proxy_url() in both
telegram.py (main connect) and telegram_network.py (fallback transport),
so a Telegram-specific proxy takes priority over the generic HTTPS_PROXY.
Also bridge telegram.proxy_url from config.yaml to the TELEGRAM_PROXY
env var (env var takes precedence if both are set), add OPTIONAL_ENV_VARS
entry, docs, and tests.
Composite salvage of four community PRs:
- Core approach (both call sites): #9414 by @leeyang1990
- config.yaml bridging + docs: #6530 by @WhiteWorld
- Naming convention: #9074 by @brantzh6
- Earlier proxy work: #7786 by @ten-ltw
Closes#9414, closes#9074, closes#7786, closes#6530
Co-authored-by: WhiteWorld <WhiteWorld@users.noreply.github.com>
Co-authored-by: brantzh6 <brantzh6@users.noreply.github.com>
Co-authored-by: ten-ltw <ten-ltw@users.noreply.github.com>
Python assertions are stripped when running with `python -O` (optimized
mode), making them unsuitable for runtime error handling.
1. `telegram_network.py:113` — After exhausting all fallback IPs, the code
uses `assert last_error is not None` before `raise last_error`. In
optimized mode, the assert is skipped; if `last_error` is unexpectedly
None, `raise None` produces a confusing `TypeError` instead of a
meaningful error. Replace with an explicit `if` check that raises
`RuntimeError` with a descriptive message.
2. `feishu.py:975` — The `_configure_with_overrides` closure uses
`assert original_configure is not None` as a guard. While the outer
scope only installs this closure when `original_configure` is not None,
the assert would silently disappear in optimized mode. Replace with an
explicit `if` check for defensive safety.
- Add resolve_proxy_url() to base.py — shared by all platform adapters
- Check HTTPS_PROXY / HTTP_PROXY / ALL_PROXY env vars first
- Fall back to macOS system proxy via scutil --proxy (zero-config)
- Pass proxy= to discord.py commands.Bot() for gateway connectivity
- Refactor telegram_network.py to use shared resolver
- Update test fixtures to accept proxy kwarg
* fix: keep gateway running through telegram proxy failures
- continue gateway startup in degraded mode when Telegram cannot connect yet
- ensure Telegram fallback transport also honors proxy env vars
- support reconnect retries without taking down the whole gateway
* test(telegram): cover proxy env handling in fallback transport
---------
Co-authored-by: kufufu9 <pi@local>
* feat(telegram): auto-discover fallback IPs via DoH when api.telegram.org is unreachable
On some networks (university, corporate), api.telegram.org resolves to a
valid Telegram IP that is unreachable due to routing/firewall rules. A
different IP in the same Telegram-owned 149.154.160.0/20 block works fine.
This adds automatic fallback IP discovery at connect time:
1. Query Google and Cloudflare DNS-over-HTTPS for api.telegram.org A records
2. Exclude the system-DNS IP (the unreachable one), use the rest as fallbacks
3. If DoH is also blocked, fall back to a seed list (149.154.167.220)
4. TelegramFallbackTransport tries primary first, sticks to whichever works
No configuration needed — works automatically. TELEGRAM_FALLBACK_IPS env var
still available as manual override. Zero impact on healthy networks (primary
path succeeds on first attempt, fallback never exercised).
No new dependencies (uses httpx already in deps + stdlib socket).
* fix: share transport instance and downgrade seed fallback log to info
- Use single TelegramFallbackTransport shared between request and
get_updates_request so sticky IP is shared across polling and API calls
- Keep separate HTTPXRequest instances (different timeout settings)
- Downgrade "using seed fallback IPs" from warning to info to avoid
noisy logs on healthy networks
* fix: add telegram.request mock and discovery fixture to remaining test files
The original PR missed test_dm_topics.py and
test_telegram_network_reconnect.py — both need the telegram.request
mock module. The reconnect test also needs _no_auto_discovery since
_handle_polling_network_error calls connect() which now invokes
discover_fallback_ips().
---------
Co-authored-by: Mohan Qiao <Gavin-Qiao@users.noreply.github.com>
