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import { getContractAddressesForNetworkOrThrow, NetworkId } from '@0x/contract-addresses';
import * as ContractArtifacts from '@0x/contract-artifacts';
import { SimpleContractArtifact } from '@0x/types';
import { AbiDefinition, ContractAbi } from 'ethereum-types';
import * as _ from 'lodash';
import {
DeployedContractInfo,
DeployedContractInfoByName,
TransactionData,
TransactionDecoder,
TransactionProperties,
} from '@0x/utils';
export class ZeroExTransactionDecoder extends TransactionDecoder {
private static _instance: ZeroExTransactionDecoder;
/**
* Adds a set of ABI definitions, after which transaction data targeting these ABI's can be decoded.
* Additional properties can be included to disambiguate similar ABI's. For example, if two functions
* have the same signature but different parameter names, then their ABI definitions can be disambiguated
* by specifying a contract name.
* @param abiDefinitions ABI definitions for a given contract.
* @param contractName Name of contract that encapsulates the ABI definitions (optional).
* @param deploymentInfos A collection of network/address pairs where this contract is deployed (optional).
*/
public static addABI(
abiDefinitions: AbiDefinition[],
contractName: string,
deploymentInfos?: DeployedContractInfo[],
): void {
const instance = ZeroExTransactionDecoder._getInstance();
instance.addABI(abiDefinitions, contractName, deploymentInfos);
}
/**
* Decodes transaction data for a known ABI.
* @param txData hex-encoded transaction data.
* @param txProperties Properties about the transaction used to disambiguate similar ABI's (optional).
* @return Decoded transaction data. Includes: function name and signature, along with the decoded arguments.
*/
public static decode(calldata: string, txProperties?: TransactionProperties): TransactionData {
const instance = ZeroExTransactionDecoder._getInstance();
const decodedCalldata = instance.decode(calldata, txProperties);
return decodedCalldata;
}
/**
* Gets instance for singleton.
* @return singleton instance.
*/
private static _getInstance(): ZeroExTransactionDecoder {
if (!ZeroExTransactionDecoder._instance) {
ZeroExTransactionDecoder._instance = new ZeroExTransactionDecoder();
}
return ZeroExTransactionDecoder._instance;
}
/**
* Adds all known contract ABI's defined by the @0x/Artifacts package, along with known 0x
* contract addresses.
*/
private constructor() {
super();
// Load addresses by contract name
const deployedContractInfoByName: DeployedContractInfoByName = {};
_.each(NetworkId, (networkId: any) => {
if (typeof networkId !== 'number') {
return;
}
const contractAddressesForNetwork = getContractAddressesForNetworkOrThrow(networkId);
_.each(contractAddressesForNetwork, (contractAddress: string, contractName: string) => {
const contractNameLowercase = _.toLower(contractName);
if (_.isUndefined(deployedContractInfoByName[contractNameLowercase])) {
deployedContractInfoByName[contractNameLowercase] = [];
}
deployedContractInfoByName[contractNameLowercase].push({
contractAddress,
networkId,
});
});
});
// Load contract artifacts
_.each(ContractArtifacts, (contractArtifactAsJson: any) => {
const conractArtifact = contractArtifactAsJson as SimpleContractArtifact;
const contractName = conractArtifact.contractName;
const contractNameLowercase = _.toLower(contractName);
const contractAbi: ContractAbi = conractArtifact.compilerOutput.abi;
this.addABI(contractAbi, contractName, deployedContractInfoByName[contractNameLowercase]);
});
}
}
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