feat(proxy): selective proxy for Railway IP-blocked providers - #2020
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dev → main: RPC benches 222-231, provider fixes, Greymass logo
- rpc-capabilities: patch http.DefaultTransport at startup with a host-keyed proxy function; PROBE_PROXY_URL + PROBE_PROXY_HOSTS env vars control which providers route through the rotating proxy vs direct connection - pm-rate-limits: add proxy.go with makeTransport() helper; UseProxy field on Venue routes blocked venues (predictit, smarkets) through PROBE_PROXY_URL; cold and ramp clients use makeTransport() so proxy applies consistently - venues.go: mark predictit + smarkets UseProxy=true; fix smarkets list URL (sort=popular was rejected by API, replaced with sort=start_datetime,id) - cronos-zkevm-rpc.yml: remove blastapi provider (no public endpoint exists), update counts from 3 to 2 providers throughout
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Summary
initSelectiveProxy()in main.go — patcheshttp.DefaultTransportwith a per-host proxy function. SetPROBE_PROXY_URL+PROBE_PROXY_HOSTSenv vars on the 3 Railway services to unblock specific providers (e.g.public.blastapi.io) without routing other measurements through the proxy (which would corrupt latency numbers).proxy.gowithmakeTransport(useProxy bool)helper.Venue.UseProxy=trueroutes that venue throughPROBE_PROXY_URL. Fixes predictit and smarkets (both Railway IP-blocked). Also fixes smarkets list URL (sort=popularwas rejected by their API — updated tosort=start_datetime,id).Railway env vars to set after merge
pm-rate-limits service:
rpc-capabilities (us/eu/sgp) — when a specific host needs unblocking:
Test plan
go build ./...)go build ./...)pmapi_request_duration_seconds_bucket