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39 lines
1.5 KiB
39 lines
1.5 KiB
const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware')
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const createFetchMiddleware = require('eth-json-rpc-middleware/fetch')
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const createBlockRefRewriteMiddleware = require('eth-json-rpc-middleware/block-ref-rewrite')
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const createBlockTrackerInspectorMiddleware = require('eth-json-rpc-middleware/block-tracker-inspector')
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const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
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const providerFromMiddleware = require('eth-json-rpc-middleware/providerFromMiddleware')
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const BlockTracker = require('eth-block-tracker')
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const inTest = process.env.IN_TEST === 'true'
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module.exports = createLocalhostClient
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function createLocalhostClient () {
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const fetchMiddleware = createFetchMiddleware({ rpcUrl: 'http://localhost:8545/' })
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const blockProvider = providerFromMiddleware(fetchMiddleware)
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const blockTracker = new BlockTracker({ provider: blockProvider, pollingInterval: 1000 })
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const networkMiddleware = mergeMiddleware([
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createEstimateGasMiddleware(),
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createBlockRefRewriteMiddleware({ blockTracker }),
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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 delay (time) {
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return new Promise(resolve => setTimeout(resolve, time))
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}
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function createEstimateGasMiddleware () {
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return createAsyncMiddleware(async (req, _, next) => {
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if (req.method === 'eth_estimateGas' && inTest) {
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await delay(2000)
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}
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return next()
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})
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}
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