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