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evm-rpc: retry transient upstream-unavailable (-32503) errors instead of crashing the dumper #501

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evm-rpc: retry transient upstream-unavailable (-32503) errors instead of crashing the dumper #501

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15 changes: 15 additions & 0 deletions evm/evm-rpc/src/rpc-client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,9 @@ export class EvmRpcClient extends RpcClient {
if (this.isRpcRateLimitError(err)) {
return true
}
if (this.isUpstreamUnavailableError(err)) {
return true
}
if (this.isRpcInternalError(err)) {
return this.retryInternalServerErrors
}
Expand All @@ -49,6 +52,18 @@ export class EvmRpcClient extends RpcClient {
)
}

isUpstreamUnavailableError(err: RpcError): boolean {
// Load-balancing / aggregating providers (e.g. uniblock) report a transient
// "service unavailable" error when all of their upstream providers momentarily
// fail to fulfill a request. This is an availability problem (the HTTP 503
// analog), not a permanent one, so it must be retried rather than crash the
// ingestion process.
return (
err.code === -32503 || // JSON-RPC "service unavailable" code used by aggregating providers
/prevented the request from being fulfilled/i.test(err.message)
)
}

isRpcRateLimitError(err: RpcError): boolean {
return (
/rate limit|too many requests/i.test(err.message) ||
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