const BLOCK_NUMBER_TX_COUNT_MAP = {
// BLOCK_NUMBER:TX_COUNT
4: 3, // start
5: 3,
6: 3,
7: 3,
8: 3,
9: 3,
10: 3,
11: 3,
12: 3,
13: 3,
14: 3,
15: 3,
16: 3,
17: 3,
18: 3,
19: 3,
20: 4, // this!
21: 4,
22: 4,
23: 4,
24: 4,
25: 4,
26: 4 // end
}
let n = 0
function isTxInBlock (blockNumber) {
console.log(`${++n}: eth_getBlockByNumber(${blockNumber})`)
return blockNumber === 20
}
function txCountInBlock (blockNumber) {
const value = BLOCK_NUMBER_TX_COUNT_MAP[blockNumber]
console.log(`${++n}: eth_getTransactionCount(${blockNumber}) -> ${value}`)
return value
}
const JUMP = 5
const startBlock = 4
const endBlock = 26
if (txCountInBlock(startBlock) === txCountInBlock(endBlock)) {
// the transaction hasn't been mined yet
// keep looking for next block
return false
}
for (let i = startBlock; i < endBlock;) {
const inA = isTxInBlock(i)
if (inA) {
console.log('Found!', i)
break
}
const inB = isTxInBlock(i + JUMP)
if (inB) {
console.log('Found!', i + JUMP)
break
}
const countA = txCountInBlock(i)
const countB = txCountInBlock(i + JUMP)
if (countA === countB) {
console.log(`Skip ${JUMP} blocks`)
i = i + JUMP + 1
} else {
i++
}
}
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