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const EthQuery = require('ethjs-query')
const assert = require('assert')
const Mutex = require('await-semaphore').Mutex
class NonceTracker {
constructor ({ provider, getPendingTransactions, getConfirmedTransactions }) {
this.provider = provider
this.ethQuery = new EthQuery(provider)
this.getPendingTransactions = getPendingTransactions
this.getConfirmedTransactions = getConfirmedTransactions
this.lockMap = {}
}
async getGlobalLock () {
const globalMutex = this._lookupMutex('global')
// await global mutex free
const releaseLock = await globalMutex.acquire()
return { releaseLock }
}
// releaseLock must be called
// releaseLock must be called after adding signed tx to pending transactions (or discarding)
async getNonceLock (address) {
// await global mutex free
await this._globalMutexFree()
// await lock free, then take lock
const releaseLock = await this._takeMutex(address)
// evaluate multiple nextNonce strategies
const nonceDetails = {}
const localNonceResult = await this._getlocalNextNonce(address)
nonceDetails.local = localNonceResult.details
const networkNonceResult = await this._getNetworkNextNonce(address)
nonceDetails.network = networkNonceResult.details
const nextNonce = Math.max(networkNonceResult.nonce, localNonceResult.nonce)
assert(Number.isInteger(nextNonce), `nonce-tracker - nextNonce is not an integer - got: (${typeof nextNonce}) "${nextNonce}"`)
// return nonce and release cb
return { nextNonce, nonceDetails, releaseLock }
}
async _getCurrentBlock () {
const blockTracker = this._getBlockTracker()
const currentBlock = blockTracker.getCurrentBlock()
if (currentBlock) return currentBlock
return await Promise((reject, resolve) => {
blockTracker.once('latest', resolve)
})
}
async _globalMutexFree () {
const globalMutex = this._lookupMutex('global')
const release = await globalMutex.acquire()
release()
}
async _takeMutex (lockId) {
const mutex = this._lookupMutex(lockId)
const releaseLock = await mutex.acquire()
return releaseLock
}
_lookupMutex (lockId) {
let mutex = this.lockMap[lockId]
if (!mutex) {
mutex = new Mutex()
this.lockMap[lockId] = mutex
}
return mutex
}
async _getNetworkNextNonce (address) {
// calculate next nonce
// we need to make sure our base count
// and pending count are from the same block
const currentBlock = await this._getCurrentBlock()
const blockNumber = currentBlock.blockNumber
const baseCountHex = await this.ethQuery.getTransactionCount(address, blockNumber)
const baseCount = parseInt(baseCountHex, 16)
assert(Number.isInteger(baseCount), `nonce-tracker - baseCount is not an integer - got: (${typeof baseCount}) "${baseCount}"`)
const nonceDetails = { blockNumber, baseCountHex, baseCount }
return { name: 'network', nonce: baseCount, details: nonceDetails }
}
async _getlocalNextNonce (address) {
let nextNonce
// check our local tx history for the highest nonce (if any)
const highestNonce = this._getLocalHighestNonce(address)
const haveHighestNonce = Number.isInteger(highestNonce)
if (haveHighestNonce) {
// next nonce is the nonce after our last
nextNonce = highestNonce + 1
} else {
// no local tx history so next must be first (zero)
nextNonce = 0
}
const nonceDetails = { highestNonce, haveHighestNonce }
return { name: 'local', nonce: nextNonce, details: nonceDetails }
}
_getLocalHighestNonce (address) {
const confirmedTransactions = this.getConfirmedTransactions(address)
const pendingTransactions = this.getPendingTransactions(address)
const transactions = confirmedTransactions.concat(pendingTransactions)
const highestNonce = this._getHighestNonce(transactions)
return highestNonce
}
_getPendingTransactionCount (address) {
const pendingTransactions = this.getPendingTransactions(address)
return this._reduceTxListToUniqueNonces(pendingTransactions).length
}
_reduceTxListToUniqueNonces (txList) {
const reducedTxList = txList.reduce((reducedList, txMeta, index) => {
if (!index) return [txMeta]
const nonceMatches = txList.filter((txData) => {
return txMeta.txParams.nonce === txData.txParams.nonce
})
if (nonceMatches.length > 1) return reducedList
reducedList.push(txMeta)
return reducedList
}, [])
return reducedTxList
}
_getHighestNonce (txList) {
const nonces = txList.map((txMeta) => parseInt(txMeta.txParams.nonce, 16))
const highestNonce = Math.max.apply(null, nonces)
return highestNonce
}
// this is a hotfix for the fact that the blockTracker will
// change when the network changes
_getBlockTracker () {
return this.provider._blockTracker
}
}
module.exports = NonceTracker
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