meta - transactions - create a transactions dir in controller and move relevant files into it

1 files changed, 189 insertions, 0 deletions

diff --git a/app/scripts/controllers/transactions/pending-tx-tracker.js b/app/scripts/controllers/transactions/pending-tx-tracker.js
new file mode 100644
index 000000000..e8869e6b8
--- /dev/null
+++ b/app/scripts/controllers/transactions/pending-tx-tracker.js
@@ -0,0 +1,189 @@
+const EventEmitter = require('events')
+const EthQuery = require('ethjs-query')
+/*
+
+  Utility class for tracking the transactions as they
+  go from a pending state to a confirmed (mined in a block) state
+
+  As well as continues broadcast while in the pending state
+
+                ~config is not optional~
+  requires a: {
+    provider: //,
+    nonceTracker: //see nonce tracker,
+    getPendingTransactions: //() a function for getting an array of transactions,
+    publishTransaction: //(rawTx) a async function for publishing raw transactions,
+  }
+
+*/
+
+module.exports = class PendingTransactionTracker extends EventEmitter {
+  constructor (config) {
+    super()
+    this.query = new EthQuery(config.provider)
+    this.nonceTracker = config.nonceTracker
+    // default is one day
+    this.getPendingTransactions = config.getPendingTransactions
+    this.getCompletedTransactions = config.getCompletedTransactions
+    this.publishTransaction = config.publishTransaction
+    this._checkPendingTxs()
+  }
+
+  //  checks if a signed tx is in a block and
+  // if included sets the tx status as 'confirmed'
+  checkForTxInBlock (block) {
+    const signedTxList = this.getPendingTransactions()
+    if (!signedTxList.length) return
+    signedTxList.forEach((txMeta) => {
+      const txHash = txMeta.hash
+      const txId = txMeta.id
+
+      if (!txHash) {
+        const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
+        noTxHashErr.name = 'NoTxHashError'
+        this.emit('tx:failed', txId, noTxHashErr)
+        return
+      }
+
+
+      block.transactions.forEach((tx) => {
+        if (tx.hash === txHash) this.emit('tx:confirmed', txId)
+      })
+    })
+  }
+
+  queryPendingTxs ({ oldBlock, newBlock }) {
+    // check pending transactions on start
+    if (!oldBlock) {
+      this._checkPendingTxs()
+      return
+    }
+    // if we synced by more than one block, check for missed pending transactions
+    const diff = Number.parseInt(newBlock.number, 16) - Number.parseInt(oldBlock.number, 16)
+    if (diff > 1) this._checkPendingTxs()
+  }
+
+
+  resubmitPendingTxs (block) {
+    const pending = this.getPendingTransactions()
+    // only try resubmitting if their are transactions to resubmit
+    if (!pending.length) return
+    pending.forEach((txMeta) => this._resubmitTx(txMeta, block.number).catch((err) => {
+      /*
+      Dont marked as failed if the error is a "known" transaction warning
+      "there is already a transaction with the same sender-nonce
+      but higher/same gas price"
+
+      Also don't mark as failed if it has ever been broadcast successfully.
+      A successful broadcast means it may still be mined.
+      */
+      const errorMessage = err.message.toLowerCase()
+      const isKnownTx = (
+        // geth
+        errorMessage.includes('replacement transaction underpriced') ||
+        errorMessage.includes('known transaction') ||
+        // parity
+        errorMessage.includes('gas price too low to replace') ||
+        errorMessage.includes('transaction with the same hash was already imported') ||
+        // other
+        errorMessage.includes('gateway timeout') ||
+        errorMessage.includes('nonce too low')
+      )
+      // ignore resubmit warnings, return early
+      if (isKnownTx) return
+      // encountered real error - transition to error state
+      txMeta.warning = {
+        error: errorMessage,
+        message: 'There was an error when resubmitting this transaction.',
+      }
+      this.emit('tx:warning', txMeta, err)
+    }))
+  }
+
+  async _resubmitTx (txMeta, latestBlockNumber) {
+    if (!txMeta.firstRetryBlockNumber) {
+      this.emit('tx:block-update', txMeta, latestBlockNumber)
+    }
+
+    const firstRetryBlockNumber = txMeta.firstRetryBlockNumber || latestBlockNumber
+    const txBlockDistance = Number.parseInt(latestBlockNumber, 16) - Number.parseInt(firstRetryBlockNumber, 16)
+
+    const retryCount = txMeta.retryCount || 0
+
+    // Exponential backoff to limit retries at publishing
+    if (txBlockDistance <= Math.pow(2, retryCount) - 1) return
+
+    // Only auto-submit already-signed txs:
+    if (!('rawTx' in txMeta)) return
+
+    const rawTx = txMeta.rawTx
+    const txHash = await this.publishTransaction(rawTx)
+
+    // Increment successful tries:
+    this.emit('tx:retry', txMeta)
+    return txHash
+  }
+
+  async _checkPendingTx (txMeta) {
+    const txHash = txMeta.hash
+    const txId = txMeta.id
+
+    // extra check in case there was an uncaught error during the
+    // signature and submission process
+    if (!txHash) {
+      const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
+      noTxHashErr.name = 'NoTxHashError'
+      this.emit('tx:failed', txId, noTxHashErr)
+      return
+    }
+
+    // If another tx with the same nonce is mined, set as failed.
+    const taken = await this._checkIfNonceIsTaken(txMeta)
+    if (taken) {
+      const nonceTakenErr = new Error('Another transaction with this nonce has been mined.')
+      nonceTakenErr.name = 'NonceTakenErr'
+      return this.emit('tx:failed', txId, nonceTakenErr)
+    }
+
+    // get latest transaction status
+    let txParams
+    try {
+      txParams = await this.query.getTransactionByHash(txHash)
+      if (!txParams) return
+      if (txParams.blockNumber) {
+        this.emit('tx:confirmed', txId)
+      }
+    } catch (err) {
+      txMeta.warning = {
+        error: err.message,
+        message: 'There was a problem loading this transaction.',
+      }
+      this.emit('tx:warning', txMeta, err)
+    }
+  }
+
+  // checks the network for signed txs and
+  // if confirmed sets the tx status as 'confirmed'
+  async _checkPendingTxs () {
+    const signedTxList = this.getPendingTransactions()
+    // in order to keep the nonceTracker accurate we block it while updating pending transactions
+    const nonceGlobalLock = await this.nonceTracker.getGlobalLock()
+    try {
+      await Promise.all(signedTxList.map((txMeta) => this._checkPendingTx(txMeta)))
+    } catch (err) {
+      console.error('PendingTransactionWatcher - Error updating pending transactions')
+      console.error(err)
+    }
+    nonceGlobalLock.releaseLock()
+  }
+
+  async _checkIfNonceIsTaken (txMeta) {
+    const address = txMeta.txParams.from
+    const completed = this.getCompletedTransactions(address)
+    const sameNonce = completed.filter((otherMeta) => {
+      return otherMeta.txParams.nonce === txMeta.txParams.nonce
+    })
+    return sameNonce.length > 0
+  }
+
+}