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rpc-client: retry transient 'no available provider' errors instead of crashing #504

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rpc-client: retry transient 'no available provider' errors instead of crashing #504

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10 changes: 10 additions & 0 deletions util/rpc-client/src/client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -526,6 +526,7 @@ export class RpcClient {
if (isRateLimitError(err)) return true
if (isExecutionTimeoutError(err)) return true
if (isRequestTimedOutError(err)) return true
if (isNoAvailableProviderError(err)) return true
if (err instanceof RpcConnectionError) return true
if (isHttpConnectionError(err)) return true
if (err instanceof HttpTimeoutError) return true
Expand Down Expand Up @@ -608,3 +609,12 @@ function isRequestTimedOutError(err: unknown): boolean {
}


function isNoAvailableProviderError(err: unknown): boolean {
// RPC aggregators (e.g. uniblock) reply with this error when none of their
// upstream providers could serve the request at that moment (a momentary
// upstream outage or quota hiccup). It is the JSON-RPC analog of an HTTP 503
// and is transient, so it must be retried rather than crash the process.
return err instanceof RpcError && /providers prevented the request from being fulfilled/i.test(err.message)
}


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