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Diffstat (limited to 'packages/contracts/src/utils/log_decoder.ts')
-rw-r--r-- | packages/contracts/src/utils/log_decoder.ts | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts new file mode 100644 index 000000000..747c7644d --- /dev/null +++ b/packages/contracts/src/utils/log_decoder.ts @@ -0,0 +1,39 @@ +import { ContractArtifact } from '@0xproject/sol-compiler'; +import { AbiDefinition, LogEntry, LogWithDecodedArgs, RawLog } from '@0xproject/types'; +import { AbiDecoder, BigNumber } from '@0xproject/utils'; +import * as _ from 'lodash'; + +import { artifacts } from './artifacts'; + +export class LogDecoder { + private _abiDecoder: AbiDecoder; + constructor(networkIdIfExists?: number) { + if (_.isUndefined(networkIdIfExists)) { + throw new Error('networkId not specified'); + } + const abiArrays: AbiDefinition[][] = []; + _.forEach(artifacts, (artifact: ContractArtifact) => { + const compilerOutput = artifact.compilerOutput; + abiArrays.push(compilerOutput.abi); + }); + this._abiDecoder = new AbiDecoder(abiArrays); + } + public decodeLogOrThrow<ArgsType>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog { + const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log); + if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) { + throw new Error(`Unable to decode log: ${JSON.stringify(log)}`); + } + wrapLogBigNumbers(logWithDecodedArgsOrLog); + return logWithDecodedArgsOrLog; + } +} + +function wrapLogBigNumbers(log: any): any { + const argNames = _.keys(log.args); + for (const argName of argNames) { + const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber('); + if (isWeb3BigNumber) { + log.args[argName] = new BigNumber(log.args[argName]); + } + } +} |