mirror of
https://github.com/kremalicious/metamask-extension.git
synced 2024-12-23 09:52:26 +01:00
95 lines
3.2 KiB
JavaScript
95 lines
3.2 KiB
JavaScript
const EthQuery = require('eth-query')
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const assert = require('assert')
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const Mutex = require('await-semaphore').Mutex
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class NonceTracker {
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constructor ({ provider, getPendingTransactions }) {
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this.provider = provider
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this.ethQuery = new EthQuery(provider)
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this.getPendingTransactions = getPendingTransactions
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this.lockMap = {}
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}
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async getGlobalLock () {
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const globalMutex = this._lookupMutex('global')
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// await global mutex free
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const releaseLock = await globalMutex.acquire()
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return { releaseLock }
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}
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// releaseLock must be called
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// releaseLock must be called after adding signed tx to pending transactions (or discarding)
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async getNonceLock (address) {
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// await global mutex free
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await this._globalMutexFree()
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// await lock free, then take lock
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const releaseLock = await this._takeMutex(address)
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// calculate next nonce
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// we need to make sure our base count
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// and pending count are from the same block
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const currentBlock = await this._getCurrentBlock()
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const pendingTransactions = this.getPendingTransactions(address)
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const pendingCount = pendingTransactions.length
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assert(Number.isInteger(pendingCount), `nonce-tracker - pendingCount is not an integer - got: (${typeof pendingCount}) "${pendingCount}"`)
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const baseCountHex = await this._getTxCount(address, currentBlock)
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const baseCount = parseInt(baseCountHex, 16)
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assert(Number.isInteger(baseCount), `nonce-tracker - baseCount is not an integer - got: (${typeof baseCount}) "${baseCount}"`)
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const nextNonce = baseCount + pendingCount
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assert(Number.isInteger(nextNonce), `nonce-tracker - nextNonce is not an integer - got: (${typeof nextNonce}) "${nextNonce}"`)
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// collect the numbers used to calculate the nonce for debugging
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const blockNumber = currentBlock.number
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const nonceDetails = { blockNumber, baseCount, baseCountHex, pendingCount }
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// return nonce and release cb
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return { nextNonce, nonceDetails, releaseLock }
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}
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async _getCurrentBlock () {
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const blockTracker = this._getBlockTracker()
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const currentBlock = blockTracker.getCurrentBlock()
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if (currentBlock) return currentBlock
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return await Promise((reject, resolve) => {
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blockTracker.once('latest', resolve)
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})
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}
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async _getTxCount (address, currentBlock) {
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const blockNumber = currentBlock.number
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return new Promise((resolve, reject) => {
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this.ethQuery.getTransactionCount(address, blockNumber, (err, result) => {
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err ? reject(err) : resolve(result)
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})
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})
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}
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async _globalMutexFree () {
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const globalMutex = this._lookupMutex('global')
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const release = await globalMutex.acquire()
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release()
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}
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async _takeMutex (lockId) {
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const mutex = this._lookupMutex(lockId)
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const releaseLock = await mutex.acquire()
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return releaseLock
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}
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_lookupMutex (lockId) {
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let mutex = this.lockMap[lockId]
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if (!mutex) {
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mutex = new Mutex()
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this.lockMap[lockId] = mutex
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}
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return mutex
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}
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// this is a hotfix for the fact that the blockTracker will
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// change when the network changes
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_getBlockTracker () {
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return this.provider._blockTracker
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}
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}
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module.exports = NonceTracker
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