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

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import { createAsyncMiddleware, mergeMiddleware } from 'json-rpc-engine';
import createFetchMiddleware from 'eth-json-rpc-middleware/fetch';
import createBlockRefRewriteMiddleware from 'eth-json-rpc-middleware/block-ref-rewrite';
import createBlockCacheMiddleware from 'eth-json-rpc-middleware/block-cache';
import createInflightMiddleware from 'eth-json-rpc-middleware/inflight-cache';
import createBlockTrackerInspectorMiddleware from 'eth-json-rpc-middleware/block-tracker-inspector';
import providerFromMiddleware from 'eth-json-rpc-middleware/providerFromMiddleware';
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import { PollingBlockTracker } from 'eth-block-tracker';
import { SECOND } from '../../../../shared/constants/time';
const inTest = process.env.IN_TEST === 'true';
const blockTrackerOpts = inTest ? { pollingInterval: SECOND } : {};
const getTestMiddlewares = () => {
return inTest ? [createEstimateGasDelayTestMiddleware()] : [];
};
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export default function createJsonRpcClient({ rpcUrl, chainId }) {
const fetchMiddleware = createFetchMiddleware({ rpcUrl });
const blockProvider = providerFromMiddleware(fetchMiddleware);
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const blockTracker = new PollingBlockTracker({
...blockTrackerOpts,
provider: blockProvider,
});
const networkMiddleware = mergeMiddleware([
...getTestMiddlewares(),
createChainIdMiddleware(chainId),
createBlockRefRewriteMiddleware({ blockTracker }),
createBlockCacheMiddleware({ blockTracker }),
createInflightMiddleware(),
createBlockTrackerInspectorMiddleware({ blockTracker }),
fetchMiddleware,
]);
return { networkMiddleware, blockTracker };
}
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function createChainIdMiddleware(chainId) {
return (req, res, next, end) => {
if (req.method === 'eth_chainId') {
res.result = chainId;
return end();
}
return next();
};
}
/**
* For use in tests only.
* Adds a delay to `eth_estimateGas` calls.
*/
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function createEstimateGasDelayTestMiddleware() {
return createAsyncMiddleware(async (req, _, next) => {
if (req.method === 'eth_estimateGas') {
await new Promise((resolve) => setTimeout(resolve, SECOND * 2));
}
return next();
});
}