1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
const EventEmitter = require('events')
const log = require('loglevel')
const EthQuery = require('ethjs-query')
/**
Event emitter utility class for tracking the transactions as they<br>
go from a pending state to a confirmed (mined in a block) state<br>
<br>
As well as continues broadcast while in the pending state
<br>
@param config {object} - non optional configuration object consists of:
@param {Object} config.provider - A network provider.
@param {Object} config.nonceTracker see nonce tracker
@param {function} config.getPendingTransactions a function for getting an array of transactions,
@param {function} config.publishTransaction a async function for publishing raw transactions,
@class
*/
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.confirmTransaction = config.confirmTransaction
this._checkPendingTxs()
}
/**
checks if a signed tx is in a block and
if it is included emits tx status as 'confirmed'
@param block {object}, a full block
@emits tx:confirmed
@emits tx:failed
*/
async checkForTxInBlock (blockNumber) {
const block = await this._getBlock(blockNumber)
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
}
if (!block.transactions.length) return
block.transactions.forEach((hash) => {
if (hash === txHash) {
this.confirmTransaction(txId)
}
})
})
}
/**
asks the network for the transaction to see if a block number is included on it
if we have skipped/missed blocks
@param object - oldBlock newBlock
*/
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, 16) - Number.parseInt(oldBlock, 16)
if (diff > 1) this._checkPendingTxs()
}
/**
Will resubmit any transactions who have not been confirmed in a block
@param block {object} - a block object
@emits tx:warning
*/
resubmitPendingTxs (blockNumber) {
const pending = this.getPendingTransactions()
// only try resubmitting if their are transactions to resubmit
if (!pending.length) return
pending.forEach((txMeta) => this._resubmitTx(txMeta, blockNumber).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)
}))
}
/**
resubmits the individual txMeta used in resubmitPendingTxs
@param txMeta {Object} - txMeta object
@param latestBlockNumber {string} - hex string for the latest block number
@emits tx:retry
@returns txHash {string}
*/
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
}
/**
Ask the network for the transaction to see if it has been include in a block
@param txMeta {Object} - the txMeta object
@emits tx:failed
@emits tx:confirmed
@emits tx:warning
*/
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.confirmTransaction(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 releases the nonce global lock if it is
*/
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) {
log.error('PendingTransactionWatcher - Error updating pending transactions')
log.error(err)
}
nonceGlobalLock.releaseLock()
}
async _getBlock (blockNumber) {
return await this.query.getBlockByNumber(blockNumber, false)
}
/**
checks to see if a confirmed txMeta has the same nonce
@param txMeta {Object} - txMeta object
@returns {boolean}
*/
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
}
}
module.exports = PendingTransactionTracker
|
