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import { AbiDefinition, BlockParam, BlockParamLiteral, LogEntry } from 'ethereum-types';
import * as R from 'ramda';
import { BaseEntity } from 'typeorm';
import { Etherscan } from '../../../data_sources/etherscan';
import { convertResponseToLogEntry } from '../event_utils';
export abstract class BaseEventHandler<EntityType extends BaseEntity> {
protected _abi: AbiDefinition[];
protected _address: string;
protected _etherscan: Etherscan;
constructor(abi: AbiDefinition[], address: string, etherscan: Etherscan) {
this._abi = abi;
this._address = address;
this._etherscan = etherscan;
}
public abstract convertLogEntryToEventEntity(logEntry: LogEntry): EntityType;
public async getEventsAsync(
fromBlock: BlockParam = BlockParamLiteral.Earliest,
toBlock: BlockParam = BlockParamLiteral.Latest,
): Promise<EntityType[]> {
const rawEventsResponse = await this._etherscan.getContractEventsAsync(this._address, fromBlock, toBlock);
const logEntries = R.map(convertResponseToLogEntry, rawEventsResponse.result);
// Note(albrow): Imperative for loop is required here because we can't
// bind convertLogEntryToEventEntity without having a specific instance
// of a sub-class.
const result = [];
for (const logEntry of logEntries) {
result.push(this.convertLogEntryToEventEntity(logEntry));
}
return result;
}
}
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