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import { Callback, 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 subprovider interface and collects traces of all transactions that were sent and all calls that were executed.
* Because there is no notion of call trace in the rpc - we collect them in 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 not influence the test behaviour.
* Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
*/
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;
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 handleRequest(
payload: Web3.JSONRPCRequestPayload,
next: NextCallback,
end: (err: Error | null, result: any) => void,
) {
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;
}
}
public async writeCoverageAsync(): Promise<void> {
await this._coverageManager.writeCoverageAsync();
}
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)) {
await this._recordTxTraceAsync(txData.to || constants.NEW_CONTRACT, 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) {
await this._recordTxTraceAsync(
transaction.to || constants.NEW_CONTRACT,
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
await 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 = {
from: this._defaultFromAddress,
isFakeTransaction: true, // This transaction (and only it) is allowed to come through when the lock is locked
...callData,
};
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] });
await 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;
}
}
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