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metamask-extension/app/scripts/controllers/network/createInfuraClient.js

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import { createScaffoldMiddleware, mergeMiddleware } from 'json-rpc-engine';
import {
createBlockRefMiddleware,
createRetryOnEmptyMiddleware,
createBlockCacheMiddleware,
createInflightCacheMiddleware,
createBlockTrackerInspectorMiddleware,
providerFromMiddleware,
} from '@metamask/eth-json-rpc-middleware';
import { createInfuraMiddleware } from '@metamask/eth-json-rpc-infura';
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import { PollingBlockTracker } from 'eth-block-tracker';
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import { BUILT_IN_NETWORKS } from '../../../../shared/constants/network';
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export default function createInfuraClient({ network, projectId }) {
const infuraMiddleware = createInfuraMiddleware({
network,
projectId,
maxAttempts: 5,
source: 'metamask',
});
const infuraProvider = providerFromMiddleware(infuraMiddleware);
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const blockTracker = new PollingBlockTracker({ provider: infuraProvider });
const networkMiddleware = mergeMiddleware([
createNetworkAndChainIdMiddleware({ network }),
createBlockCacheMiddleware({ blockTracker }),
createInflightCacheMiddleware(),
createBlockRefMiddleware({ blockTracker, provider: infuraProvider }),
createRetryOnEmptyMiddleware({ blockTracker, provider: infuraProvider }),
createBlockTrackerInspectorMiddleware({ blockTracker }),
infuraMiddleware,
]);
return { networkMiddleware, blockTracker };
}
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function createNetworkAndChainIdMiddleware({ network }) {
if (!BUILT_IN_NETWORKS[network]) {
throw new Error(`createInfuraClient - unknown network "${network}"`);
}
const { chainId, networkId } = BUILT_IN_NETWORKS[network];
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return createScaffoldMiddleware({
eth_chainId: chainId,
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net_version: networkId,
});
}