56 lines
2.3 KiB
TypeScript
56 lines
2.3 KiB
TypeScript
import { ContractArtifact } from '@0xproject/sol-compiler';
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import { AbiDecoder, BigNumber } from '@0xproject/utils';
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import { Web3Wrapper } from '@0xproject/web3-wrapper';
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import {
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AbiDefinition,
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DecodedLogArgs,
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LogEntry,
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LogWithDecodedArgs,
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RawLog,
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TransactionReceiptWithDecodedLogs,
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} from 'ethereum-types';
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import * as _ from 'lodash';
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import { artifacts } from './artifacts';
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import { constants } from './constants';
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export class LogDecoder {
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private _web3Wrapper: Web3Wrapper;
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private _contractAddress: string;
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private _abiDecoder: AbiDecoder;
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public static wrapLogBigNumbers(log: any): any {
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const argNames = _.keys(log.args);
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for (const argName of argNames) {
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const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber(');
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if (isWeb3BigNumber) {
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log.args[argName] = new BigNumber(log.args[argName]);
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}
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}
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}
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constructor(web3Wrapper: Web3Wrapper, contractAddress: string) {
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this._web3Wrapper = web3Wrapper;
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this._contractAddress = contractAddress;
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const abiArrays: AbiDefinition[][] = [];
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_.forEach(artifacts, (artifact: ContractArtifact) => {
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const compilerOutput = artifact.compilerOutput;
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abiArrays.push(compilerOutput.abi);
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});
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this._abiDecoder = new AbiDecoder(abiArrays);
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}
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public decodeLogOrThrow<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
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const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
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// tslint:disable-next-line:no-unnecessary-type-assertion
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if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) {
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throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);
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}
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LogDecoder.wrapLogBigNumbers(logWithDecodedArgsOrLog);
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return logWithDecodedArgsOrLog;
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}
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public async getTxWithDecodedLogsAsync(txHash: string): Promise<TransactionReceiptWithDecodedLogs> {
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const tx = await this._web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
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tx.logs = _.filter(tx.logs, log => log.address === this._contractAddress);
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tx.logs = _.map(tx.logs, log => this.decodeLogOrThrow(log));
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return tx;
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}
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}
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