When slskd_url is configured but the host is unreachable (slskd not
running, wrong port, host.docker.internal not resolving), the frontend's
/api/downloads/status polling fanned out to every download plugin
including Soulseek. soulseek_client._make_request hit a DNS / connect
failure on each poll and logged it at ERROR. Result: one
"Cannot connect to host host.docker.internal:5030" log line every
~2-3 seconds for the entire duration of any download — visible spam
even when the user wasn't using Soulseek at all.
Caught aiohttp.ClientConnectorError explicitly in both _make_request
and _make_direct_request. First failure emits one WARNING with
actionable context (start slskd, or clear soulseek.slskd_url if you
don't use Soulseek). Subsequent failures demote to DEBUG. The
_last_unreachable_logged flag resets on any successful (200/201/204)
response so a later outage warns again — suppression is per-outage,
not per-process-lifetime. Same shape as the existing _last_401_logged
suppression for auth failures.
The architectural gap (status polling fans out to soulseek even when
the user has soulseek disabled in their active download sources) is
intentionally left for a follow-up. The plugin-iteration code lives
in core/download_engine/engine.py and core/download_orchestrator.py;
threading a "skip-when-not-active" gate through every caller is a
bigger refactor than this user-facing log cleanup warrants. The
WARNING-once message tells the user what to do in the meantime.
5 new pinning tests cover the suppression contract: connection error
returns None (not raises), first failure WARNs + sets flag, repeats
stay quiet, successful response resets the flag, _make_direct_request
follows the same pattern, and non-connection exceptions still log at
ERROR so real bugs aren't hidden behind the new suppression.
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