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import { NodeType } from '@0x/web3-wrapper';
import * as _ from 'lodash';
import { constants } from './constants';
import { getContractAddressToTraces } from './trace';
import { TraceCollectionSubprovider } from './trace_collection_subprovider';
import { TraceInfo, TraceInfoExistingContract, TraceInfoNewContract } from './types';
// TraceInfoSubprovider is extended by subproviders which need to work with one
// TraceInfo at a time. It has one abstract method: _handleTraceInfoAsync, which
// is called for each TraceInfo.
export abstract class TraceInfoSubprovider extends TraceCollectionSubprovider {
protected abstract _handleTraceInfoAsync(traceInfo: TraceInfo): Promise<void>;
protected async _recordTxTraceAsync(address: string, data: string | undefined, txHash: string): Promise<void> {
await this._web3Wrapper.awaitTransactionMinedAsync(txHash, 0);
const nodeType = await this._web3Wrapper.getNodeTypeAsync();
let trace;
if (nodeType === NodeType.Geth) {
// For very large traces we use a custom tracer that outputs a format compatible with a
// regular trace. We only need the 2nd item on the stack when the instruction is a call.
// By not including other stack values, we drastically limit the amount of data to be collected.
// There are no good docs about how to write those tracers, but you can find some example ones here:
// https://github.com/ethereum/go-ethereum/tree/master/eth/tracers/internal/tracers
const tracer = `
{
data: [],
step: function(log) {
const op = log.op.toString();
const opn = 0 | log.op.toNumber();
const pc = 0 | log.getPC();
const depth = 0 | log.getDepth();
const gasCost = 0 | log.getCost();
const gas = 0 | log.getGas();
const isCall = opn == 0xf1 || opn == 0xf2 || opn == 0xf4 || opn == 0xf5;
const stack = isCall ? ['0x'+log.stack.peek(1).toString(16), null] : null;
this.data.push({ pc, gasCost, depth, op, stack, gas });
},
fault: function() { },
result: function() { return {structLogs: this.data}; }
}
`;
trace = await this._web3Wrapper.getTransactionTraceAsync(txHash, { tracer, timeout: '600s' });
} else {
/**
* Ganache doesn't support custom tracers yet.
*/
trace = await this._web3Wrapper.getTransactionTraceAsync(txHash, {
disableMemory: true,
disableStack: false,
disableStorage: true,
});
}
const contractAddressToTraces = getContractAddressToTraces(trace.structLogs, address);
const subcallAddresses = _.keys(contractAddressToTraces);
if (address === constants.NEW_CONTRACT) {
for (const subcallAddress of subcallAddresses) {
let traceInfo: TraceInfoNewContract | TraceInfoExistingContract;
if (subcallAddress === 'NEW_CONTRACT') {
const traceForThatSubcall = contractAddressToTraces[subcallAddress];
traceInfo = {
subtrace: traceForThatSubcall,
txHash,
address: subcallAddress,
bytecode: data as string,
};
} else {
const runtimeBytecode = await this._web3Wrapper.getContractCodeAsync(subcallAddress);
const traceForThatSubcall = contractAddressToTraces[subcallAddress];
traceInfo = {
subtrace: traceForThatSubcall,
txHash,
address: subcallAddress,
runtimeBytecode,
};
}
await this._handleTraceInfoAsync(traceInfo);
}
} else {
for (const subcallAddress of subcallAddresses) {
const runtimeBytecode = await this._web3Wrapper.getContractCodeAsync(subcallAddress);
const traceForThatSubcall = contractAddressToTraces[subcallAddress];
const traceInfo: TraceInfoExistingContract = {
subtrace: traceForThatSubcall,
txHash,
address: subcallAddress,
runtimeBytecode,
};
await this._handleTraceInfoAsync(traceInfo);
}
}
}
}
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