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
|
import { Callback, ErrorCallback, NextCallback, Subprovider } from '@0xproject/subproviders';
import { promisify } from '@0xproject/utils';
import * as _ from 'lodash';
import { Lock } from 'semaphore-async-await';
import * as Web3 from 'web3';
import { constants } from './constants';
import { CoverageManager } from './coverage_manager';
import { TraceInfoExistingContract, TraceInfoNewContract } from './types';
interface MaybeFakeTxData extends Web3.TxData {
isFakeTransaction?: boolean;
}
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
* It collects traces of all transactions that were sent and all calls that were executed through JSON RPC.
* Because there is no notion of a call trace in the Ethereum rpc - we collect them in a rather non-obvious/hacky way.
* On each call - we create a snapshot, execute the call as a transaction, get the trace, revert the snapshot.
* That allows us to avoid influencing test behaviour.
*/
export class CoverageSubprovider extends Subprovider {
// Lock is used to not accept normal transactions while doing call/snapshot magic because they'll be reverted later otherwise
private _lock: Lock;
private _coverageManager: CoverageManager;
private _defaultFromAddress: string;
/**
* Instantiates a CoverageSubprovider
* @param artifactsPath Path to the smart contract artifacts
* @param sourcePath Path to the smart contract source files
* @param networkId network id
* @param defaultFromAddress default from address to use when sending transactions
*/
constructor(artifactsPath: string, sourcesPath: string, networkId: number, defaultFromAddress: string) {
super();
this._lock = new Lock();
this._defaultFromAddress = defaultFromAddress;
this._coverageManager = new CoverageManager(
artifactsPath,
sourcesPath,
networkId,
this._getContractCodeAsync.bind(this),
);
}
public async writeCoverageAsync(): Promise<void> {
await this._coverageManager.writeCoverageAsync();
}
// This method must conform to the web3-provider-engine interface
// tslint:disable-next-line:prefer-function-over-method underscore-private-and-protected
private handleRequest(payload: Web3.JSONRPCRequestPayload, next: NextCallback, end: ErrorCallback) {
switch (payload.method) {
case 'eth_sendTransaction':
const txData = payload.params[0];
next(this._onTransactionSentAsync.bind(this, txData));
return;
case 'eth_call':
const callData = payload.params[0];
const blockNumber = payload.params[1];
next(this._onCallExecutedAsync.bind(this, callData, blockNumber));
return;
default:
next();
return;
}
}
private async _onTransactionSentAsync(
txData: MaybeFakeTxData,
err: Error | null,
txHash: string | undefined,
cb: Callback,
): Promise<void> {
if (!txData.isFakeTransaction) {
// This transaction is a usual ttransaction. Not a call executed as one.
// And we don't want it to be executed within a snapshotting period
await this._lock.acquire();
}
if (_.isNull(err)) {
const toAddress = _.isUndefined(txData.to) || txData.to === '0x0' ? constants.NEW_CONTRACT : txData.to;
await this._recordTxTraceAsync(toAddress, txData.data, txHash as string);
} else {
const payload = {
method: 'eth_getBlockByNumber',
params: ['latest', true],
};
const jsonRPCResponsePayload = await this.emitPayloadAsync(payload);
const transactions = jsonRPCResponsePayload.result.transactions;
for (const transaction of transactions) {
const toAddress = _.isUndefined(txData.to) || txData.to === '0x0' ? constants.NEW_CONTRACT : txData.to;
await this._recordTxTraceAsync(toAddress, transaction.data, transaction.hash);
}
}
if (!txData.isFakeTransaction) {
// This transaction is a usual ttransaction. Not a call executed as one.
// And we don't want it to be executed within a snapshotting period
this._lock.release();
}
cb();
}
private async _onCallExecutedAsync(
callData: Partial<Web3.CallData>,
blockNumber: Web3.BlockParam,
err: Error | null,
callResult: string,
cb: Callback,
): Promise<void> {
await this._recordCallTraceAsync(callData, blockNumber);
cb();
}
private async _recordTxTraceAsync(address: string, data: string | undefined, txHash: string): Promise<void> {
let payload = {
method: 'debug_traceTransaction',
params: [txHash, { disableMemory: true, disableStack: true, disableStorage: true }], // TODO For now testrpc just ignores those parameters https://github.com/trufflesuite/ganache-cli/issues/489
};
const jsonRPCResponsePayload = await this.emitPayloadAsync(payload);
const trace: Web3.TransactionTrace = jsonRPCResponsePayload.result;
const coveredPcs = _.map(trace.structLogs, log => log.pc);
if (address === constants.NEW_CONTRACT) {
const traceInfo: TraceInfoNewContract = {
coveredPcs,
txHash,
address: address as 'NEW_CONTRACT',
bytecode: data as string,
};
this._coverageManager.appendTraceInfo(traceInfo);
} else {
payload = { method: 'eth_getCode', params: [address, 'latest'] };
const runtimeBytecode = (await this.emitPayloadAsync(payload)).result;
const traceInfo: TraceInfoExistingContract = {
coveredPcs,
txHash,
address,
runtimeBytecode,
};
this._coverageManager.appendTraceInfo(traceInfo);
}
}
private async _recordCallTraceAsync(callData: Partial<Web3.CallData>, blockNumber: Web3.BlockParam): Promise<void> {
// We don't want other transactions to be exeucted during snashotting period, that's why we lock the
// transaction execution for all transactions except our fake ones.
await this._lock.acquire();
const snapshotId = Number((await this.emitPayloadAsync({ method: 'evm_snapshot' })).result);
const fakeTxData: MaybeFakeTxData = {
isFakeTransaction: true, // This transaction (and only it) is allowed to come through when the lock is locked
...callData,
from: callData.from || this._defaultFromAddress,
};
try {
await this.emitPayloadAsync({
method: 'eth_sendTransaction',
params: [fakeTxData],
});
} catch (err) {
// Even if this transaction failed - we've already recorded it's trace.
}
const jsonRPCResponse = await this.emitPayloadAsync({ method: 'evm_revert', params: [snapshotId] });
this._lock.release();
const didRevert = jsonRPCResponse.result;
if (!didRevert) {
throw new Error('Failed to revert the snapshot');
}
}
private async _getContractCodeAsync(address: string): Promise<string> {
const payload = {
method: 'eth_getCode',
params: [address, 'latest'],
};
const jsonRPCResponsePayload = await this.emitPayloadAsync(payload);
const contractCode: string = jsonRPCResponsePayload.result;
return contractCode;
}
}
|
