1
0
mirror of https://github.com/kremalicious/metamask-extension.git synced 2024-12-23 09:52:26 +01:00
metamask-extension/app/scripts/controllers/network/createJsonRpcClient.js

62 lines
1.8 KiB
JavaScript
Raw Normal View History

import { createAsyncMiddleware, mergeMiddleware } from 'json-rpc-engine';
import {
createFetchMiddleware,
createBlockRefRewriteMiddleware,
createBlockCacheMiddleware,
createInflightCacheMiddleware,
createBlockTrackerInspectorMiddleware,
providerFromMiddleware,
} from 'eth-json-rpc-middleware';
2021-03-26 18:03:44 +01:00
import { PollingBlockTracker } from 'eth-block-tracker';
import { SECOND } from '../../../../shared/constants/time';
const inTest = process.env.IN_TEST;
const blockTrackerOpts = inTest ? { pollingInterval: SECOND } : {};
const getTestMiddlewares = () => {
return inTest ? [createEstimateGasDelayTestMiddleware()] : [];
};
2020-11-03 00:41:28 +01:00
export default function createJsonRpcClient({ rpcUrl, chainId }) {
const fetchMiddleware = createFetchMiddleware({ rpcUrl });
const blockProvider = providerFromMiddleware(fetchMiddleware);
2021-03-26 18:03:44 +01:00
const blockTracker = new PollingBlockTracker({
...blockTrackerOpts,
provider: blockProvider,
});
const networkMiddleware = mergeMiddleware([
...getTestMiddlewares(),
createChainIdMiddleware(chainId),
createBlockRefRewriteMiddleware({ blockTracker }),
createBlockCacheMiddleware({ blockTracker }),
createInflightCacheMiddleware(),
createBlockTrackerInspectorMiddleware({ blockTracker }),
fetchMiddleware,
]);
return { networkMiddleware, blockTracker };
}
2020-11-03 00:41:28 +01:00
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.
*/
2020-11-03 00:41:28 +01:00
function createEstimateGasDelayTestMiddleware() {
return createAsyncMiddleware(async (req, _, next) => {
if (req.method === 'eth_estimateGas') {
await new Promise((resolve) => setTimeout(resolve, SECOND * 2));
}
return next();
});
}