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import { StructLog } from 'ethereum-types';
import * as _ from 'lodash';
import { constants } from './constants';
import { getTracesByContractAddress } 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);
// 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 othe stack values, we severly limit the amount of data to be collectd.
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 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, gas, depth, op, stack}); ' +
' },' +
' fault: function() { },' +
' result: function() { return {structLogs: this.data}; }' +
'}';
const trace = await this._web3Wrapper.getTransactionTraceAsync(txHash, { tracer, timeout: '600s' });
const tracesByContractAddress = getTracesByContractAddress(trace.structLogs, address);
const subcallAddresses = _.keys(tracesByContractAddress);
if (address === constants.NEW_CONTRACT) {
for (const subcallAddress of subcallAddresses) {
let traceInfo: TraceInfoNewContract | TraceInfoExistingContract;
if (subcallAddress === 'NEW_CONTRACT') {
const traceForThatSubcall = tracesByContractAddress[subcallAddress];
traceInfo = {
subtrace: traceForThatSubcall,
txHash,
address: subcallAddress,
bytecode: data as string,
};
} else {
const runtimeBytecode = await this._web3Wrapper.getContractCodeAsync(subcallAddress);
const traceForThatSubcall = tracesByContractAddress[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 = tracesByContractAddress[subcallAddress];
const traceInfo: TraceInfoExistingContract = {
subtrace: traceForThatSubcall,
txHash,
address: subcallAddress,
runtimeBytecode,
};
await this._handleTraceInfoAsync(traceInfo);
}
}
}
}
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