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34 lines
1.6 KiB
34 lines
1.6 KiB
7 years ago
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const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware')
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const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
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const createFetchMiddleware = require('eth-json-rpc-middleware/fetch')
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const createBlockRefMiddleware = require('eth-json-rpc-middleware/block-ref')
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const createBlockRefMiddleware = require('eth-json-rpc-middleware/block-cache')
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const BlockTracker = require('eth-block-tracker')
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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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createBlockRefMiddleware({ 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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// inspect if response contains a block ref higher than our latest block
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const futureBlockRefRequests = ['eth_getTransactionByHash', 'eth_getTransactionReceipt']
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function createBlockTrackerInspectorMiddleware ({ blockTracker }) {
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return createAsyncMiddleware(async (req, res, next) => {
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if (!futureBlockRefRequests.includes(req.method)) return next()
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await next()
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const blockNumber = Number.parseInt(res.result.blockNumber, 16)
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const currentBlockNumber = Number.parseInt(blockTracker.getCurrentBlock(), 16)
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if (blockNumber > currentBlockNumber) await blockTracker.checkForLatestBlock()
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})
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}
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