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
|
import * as _ from 'lodash';
import { BlockParamLiteral } from '@0xproject/types';
import EthereumTx = require('ethereumjs-tx');
import ethUtil = require('ethereumjs-util');
import * as Web3 from 'web3';
import providerEngineUtils = require('web3-provider-engine/util/rpc-cache-utils');
import { Callback, ErrorCallback, NextCallback, NonceSubproviderErrors } from '../types';
import { Subprovider } from './subprovider';
const NONCE_TOO_LOW_ERROR_MESSAGE = 'Transaction nonce is too low';
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
* It is heavily inspired by the [NonceSubprovider](https://github.com/MetaMask/provider-engine/blob/master/subproviders/nonce-tracker.js).
* We added the additional feature of clearing the cached nonce value when a `nonce value too low` error occurs.
*/
export class NonceTrackerSubprovider extends Subprovider {
private _nonceCache: { [address: string]: string } = {};
private static _reconstructTransaction(payload: Web3.JSONRPCRequestPayload): EthereumTx {
const raw = payload.params[0];
if (_.isUndefined(raw)) {
throw new Error(NonceSubproviderErrors.EmptyParametersFound);
}
const rawData = ethUtil.toBuffer(raw);
const transaction = new EthereumTx(rawData);
return transaction;
}
private static _determineAddress(payload: Web3.JSONRPCRequestPayload): string {
let address: string;
switch (payload.method) {
case 'eth_getTransactionCount':
address = payload.params[0].toLowerCase();
return address;
case 'eth_sendRawTransaction':
const transaction = NonceTrackerSubprovider._reconstructTransaction(payload);
const addressRaw = transaction
.getSenderAddress()
.toString('hex')
.toLowerCase();
address = `0x${addressRaw}`;
return address;
default:
throw new Error(NonceSubproviderErrors.CannotDetermineAddressFromPayload);
}
}
// Required to implement this public interface which doesn't conform to our linting rule.
// tslint:disable-next-line:prefer-function-over-method underscore-private-and-protected
private async handleRequest(
payload: Web3.JSONRPCRequestPayload,
next: NextCallback,
end: ErrorCallback,
): Promise<void> {
switch (payload.method) {
case 'eth_getTransactionCount':
const requestDefaultBlock = providerEngineUtils.blockTagForPayload(payload);
if (requestDefaultBlock === BlockParamLiteral.Pending) {
const address = NonceTrackerSubprovider._determineAddress(payload);
const cachedResult = this._nonceCache[address];
if (!_.isUndefined(cachedResult)) {
return end(null, cachedResult);
} else {
return next((requestError: Error | null, requestResult: any, cb: Callback) => {
if (_.isNull(requestError)) {
this._nonceCache[address] = requestResult as string;
}
cb();
});
}
} else {
return next();
}
case 'eth_sendRawTransaction':
return next((sendTransactionError: Error | null, txResult: any, cb: Callback) => {
if (_.isNull(sendTransactionError)) {
this._handleSuccessfulTransaction(payload);
} else {
this._handleSendTransactionError(payload, sendTransactionError);
}
cb();
});
default:
return next();
}
}
private _handleSuccessfulTransaction(payload: Web3.JSONRPCRequestPayload): void {
const address = NonceTrackerSubprovider._determineAddress(payload);
const transaction = NonceTrackerSubprovider._reconstructTransaction(payload);
// Increment the nonce from the previous successfully submitted transaction
let nonce = ethUtil.bufferToInt(transaction.nonce);
nonce++;
let nextHexNonce = nonce.toString(16);
if (nextHexNonce.length % 2) {
nextHexNonce = `0${nextHexNonce}`;
}
const nextPrefixedHexNonce = `0x${nextHexNonce}`;
this._nonceCache[address] = nextPrefixedHexNonce;
}
private _handleSendTransactionError(payload: Web3.JSONRPCRequestPayload, err: Error): void {
const address = NonceTrackerSubprovider._determineAddress(payload);
if (this._nonceCache[address] && _.includes(err.message, NONCE_TOO_LOW_ERROR_MESSAGE)) {
delete this._nonceCache[address];
}
}
}
|
