src/contract_wrappers/contract_wrapper.ts


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import * as _ from 'lodash';
import * as Web3 from 'web3';
import {Web3Wrapper} from '../web3_wrapper';
import {AbiDecoder} from '../utils/abi_decoder';
import {ZeroExError, Artifact, LogWithDecodedArgs, RawLog, ContractEvents} from '../types';
import {utils} from '../utils/utils';

export class ContractWrapper {
    protected _web3Wrapper: Web3Wrapper;
    private _abiDecoder?: AbiDecoder;
    constructor(web3Wrapper: Web3Wrapper, abiDecoder?: AbiDecoder) {
        this._web3Wrapper = web3Wrapper;
        this._abiDecoder = abiDecoder;
    }
    protected tryToDecodeLogOrNoOp(log: Web3.LogEntry): LogWithDecodedArgs|RawLog {
        if (_.isUndefined(this._abiDecoder)) {
            throw new Error(ZeroExError.NoAbiDecoder);
        }
        const logWithDecodedArgs = this._abiDecoder.tryToDecodeLogOrNoOp(log);
        return logWithDecodedArgs;
    }
    protected async _instantiateContractIfExistsAsync<A extends Web3.ContractInstance>(artifact: Artifact,
                                                                                       addressIfExists?: string,
                                                                                      ): Promise<A> {
        const contractInstance =
            await this._web3Wrapper.getContractInstanceFromArtifactAsync<A>(artifact, addressIfExists);
        return contractInstance;
    }
    protected _getEventSignatureFromAbiByName(abi: Web3.ContractAbi, eventName: ContractEvents): string {
        const eventAbi = _.filter(abi, {name: eventName})[0] as Web3.EventAbi;
        const types = _.map(eventAbi.inputs, 'type');
        const signature = `${eventAbi.name}(${types.join(',')})`;
        return signature;
    }
}