Function getKeyLocation

fdbclient/NativeAPI.actor.cpp:2940–2972

template <class F>
Future<KeyRangeLocationInfo> getKeyLocation(Database const& cx,
                                            TenantInfo const& tenant,
                                            Key const& key,
                                            F StorageServerInterface::*member,
                                            SpanContext spanContext,
                                            Optional<UID> debugID,
                                            UseProvisionalProxies useProvisionalProxies,
                                            Reverse isBackward,
                                            Version version) {
	// we first check whether this range is cached
	Optional<KeyRangeLocationInfo> locationInfo = cx->getCachedLocation(tenant.name, key, isBackward);
	if (!locationInfo.present()) {
		return getKeyLocation_internal(
		    cx, tenant, key, spanContext, debugID, useProvisionalProxies, isBackward, version);
	}

	bool onlyEndpointFailedAndNeedRefresh = false;
	for (int i = 0; i < locationInfo.get().locations->size(); i++) {
		if (checkOnlyEndpointFailed(cx, locationInfo.get().locations->get(i, member).getEndpoint())) {
			onlyEndpointFailedAndNeedRefresh = true;
		}
	}

	if (onlyEndpointFailedAndNeedRefresh) {
		cx->invalidateCache(locationInfo.get().tenantEntry.prefix, key);

		// Refresh the cache with a new getKeyLocations made to proxies.
		return getKeyLocation_internal(
		    cx, tenant, key, spanContext, debugID, useProvisionalProxies, isBackward, version);
	}

	return locationInfo.get();
}

template <class F>
Future<KeyRangeLocationInfo> getKeyLocation(Reference<TransactionState> trState,