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const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware')
const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
const createBlockRefMiddleware = require('eth-json-rpc-middleware/block-ref')
const createBlockRefMiddleware = require('eth-json-rpc-middleware/block-cache')
const BlockTracker = require('eth-block-tracker')
module.exports = createInfuraClient
function createInfuraClient({ network }) {
const infuraMiddleware = createInfuraMiddleware({ network })
const blockProvider = providerFromMiddleware(infuraMiddleware)
const blockTracker = new BlockTracker({ provider: blockProvider })
const networkMiddleware = mergeMiddleware([
createBlockRefMiddleware({ blockTracker }),
createBlockCacheMiddleware({ blockTracker }),
createInflightMiddleware(),
createBlockTrackerInspectorMiddleware({ blockTracker }),
infuraMiddleware,
])
return { networkMiddleware, blockTracker }
}
// inspect if response contains a block ref higher than our latest block
const futureBlockRefRequests = ['eth_getTransactionByHash', 'eth_getTransactionReceipt']
function createBlockTrackerInspectorMiddleware ({ blockTracker }) {
return createAsyncMiddleware(async (req, res, next) => {
if (!futureBlockRefRequests.includes(req.method)) return next()
await next()
const blockNumber = Number.parseInt(res.result.blockNumber, 16)
const currentBlockNumber = Number.parseInt(blockTracker.getCurrentBlock(), 16)
if (blockNumber > currentBlockNumber) await blockTracker.checkForLatestBlock()
})
}
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