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import { ExchangeEventArgs } from '@0xproject/contract-wrappers';
import { AbiDecoder } from '@0xproject/utils';
import { AbiDefinition, LogEntry, LogWithDecodedArgs } from 'ethereum-types';
import * as R from 'ramda';
// Raw events response from etherescan.io
export interface EventsResponse {
status: string;
message: string;
result: EventsResponseResult[];
}
// Events as represented in the response from etherscan.io
export interface EventsResponseResult {
address: string;
topics: string[];
data: string;
blockNumber: string;
timeStamp: string;
gasPrice: string;
gasUsed: string;
logIndex: string;
transactionHash: string;
transactionIndex: string;
}
const hexRadix = 16;
function hexToInt(hex: string): number {
return parseInt(hex.replace('0x', ''), hexRadix);
}
// Converts a raw event response to a LogEntry
// tslint:disable-next-line:completed-docs
export function _convertResponseToLogEntry(result: EventsResponseResult): LogEntry {
return {
logIndex: hexToInt(result.logIndex),
transactionIndex: hexToInt(result.transactionIndex),
transactionHash: result.transactionHash,
blockHash: '',
blockNumber: hexToInt(result.blockNumber),
address: result.address,
data: result.data,
topics: result.topics,
};
}
// Decodes a LogEntry into a LogWithDecodedArgs
// tslint:disable-next-line:completed-docs
export const _decodeLogEntry = R.curry((contractAbi: AbiDefinition[], log: LogEntry): LogWithDecodedArgs<
ExchangeEventArgs
> => {
const abiDecoder = new AbiDecoder([contractAbi]);
const logWithDecodedArgs = abiDecoder.tryToDecodeLogOrNoop(log);
// tslint:disable-next-line:no-unnecessary-type-assertion
return logWithDecodedArgs as LogWithDecodedArgs<ExchangeEventArgs>;
});
/**
* Parses and abi-decodes the raw events response from etherscan.io.
* @param contractAbi The ABI for the contract that the events where emited from.
* @param rawEventsResponse The raw events response from etherescan.io.
* @returns Parsed and decoded events.
*/
export function parseRawEventsResponse(
contractAbi: AbiDefinition[],
rawEventsResponse: EventsResponse,
): Array<LogWithDecodedArgs<ExchangeEventArgs>> {
return R.pipe(R.map(_convertResponseToLogEntry), R.map(_decodeLogEntry(contractAbi)))(rawEventsResponse.result);
}
// export const parseRawEventsResponse = R.pipe(R.map(_convertResponseToLogEntry), R.map(_decodeLogEntry));
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