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58 lines
2.0 KiB
58 lines
2.0 KiB
import { createAsyncMiddleware, mergeMiddleware } from 'json-rpc-engine';
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import createFetchMiddleware from 'eth-json-rpc-middleware/fetch';
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import createBlockRefRewriteMiddleware from 'eth-json-rpc-middleware/block-ref-rewrite';
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import createBlockCacheMiddleware from 'eth-json-rpc-middleware/block-cache';
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import createInflightMiddleware from 'eth-json-rpc-middleware/inflight-cache';
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import createBlockTrackerInspectorMiddleware from 'eth-json-rpc-middleware/block-tracker-inspector';
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import providerFromMiddleware from 'eth-json-rpc-middleware/providerFromMiddleware';
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import BlockTracker from 'eth-block-tracker';
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const inTest = process.env.IN_TEST === 'true';
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const blockTrackerOpts = inTest ? { pollingInterval: 1000 } : {};
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const getTestMiddlewares = () => {
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return inTest ? [createEstimateGasDelayTestMiddleware()] : [];
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};
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export default function createJsonRpcClient({ rpcUrl, chainId }) {
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const fetchMiddleware = createFetchMiddleware({ rpcUrl });
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const blockProvider = providerFromMiddleware(fetchMiddleware);
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const blockTracker = new BlockTracker({
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...blockTrackerOpts,
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provider: blockProvider,
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});
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const networkMiddleware = mergeMiddleware([
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...getTestMiddlewares(),
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createChainIdMiddleware(chainId),
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createBlockRefRewriteMiddleware({ blockTracker }),
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createBlockCacheMiddleware({ blockTracker }),
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createInflightMiddleware(),
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createBlockTrackerInspectorMiddleware({ blockTracker }),
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fetchMiddleware,
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]);
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return { networkMiddleware, blockTracker };
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}
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function createChainIdMiddleware(chainId) {
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return (req, res, next, end) => {
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if (req.method === 'eth_chainId') {
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res.result = chainId;
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return end();
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}
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return next();
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};
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}
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/**
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* For use in tests only.
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* Adds a delay to `eth_estimateGas` calls.
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*/
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function createEstimateGasDelayTestMiddleware() {
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return createAsyncMiddleware(async (req, _, next) => {
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if (req.method === 'eth_estimateGas') {
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await new Promise((resolve) => setTimeout(resolve, 2000));
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}
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return next();
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});
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}
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