81 lines
2.2 KiB
TypeScript
81 lines
2.2 KiB
TypeScript
import { EvmLog, EvmTopicFilter } from "../../entities";
|
|
import { StatRepository } from "../../repositories";
|
|
import { ethers } from "ethers";
|
|
|
|
/**
|
|
* Handling means mapping and forward to a given target.
|
|
* As of today, only one type of event can be handled per each instance.
|
|
*/
|
|
export class HandleEvmLogs<T> {
|
|
cfg: HandleEvmConfig;
|
|
mapper: (log: EvmLog, parsedArgs: ReadonlyArray<any>) => T;
|
|
target: (parsed: T[], chain: string) => Promise<void>;
|
|
statsRepo: StatRepository;
|
|
|
|
constructor(
|
|
cfg: HandleEvmConfig,
|
|
mapper: (log: EvmLog, args: ReadonlyArray<any>) => T,
|
|
target: (parsed: T[], chain: string) => Promise<void>,
|
|
statsRepo: StatRepository
|
|
) {
|
|
this.cfg = this.normalizeCfg(cfg);
|
|
this.mapper = mapper;
|
|
this.target = target;
|
|
this.statsRepo = statsRepo;
|
|
}
|
|
|
|
public async handle(logs: EvmLog[]): Promise<T[]> {
|
|
const mappedItems = logs
|
|
.filter(
|
|
(log) =>
|
|
this.cfg.filter.addresses.includes(log.address.toLowerCase()) &&
|
|
this.cfg.filter.topics.includes(log.topics[0].toLowerCase())
|
|
)
|
|
.map((log) => {
|
|
const iface = new ethers.utils.Interface([this.cfg.abi]);
|
|
const parsedLog = iface.parseLog(log);
|
|
const logMap = this.mapper(log, parsedLog.args);
|
|
this.report();
|
|
return logMap;
|
|
});
|
|
|
|
await this.target(mappedItems, this.cfg.chain);
|
|
// TODO: return a result specifying failures if any
|
|
return mappedItems;
|
|
}
|
|
|
|
private report() {
|
|
const labels = {
|
|
job: this.cfg.id,
|
|
chain: this.cfg.chain ?? "",
|
|
commitment: this.cfg.commitment,
|
|
};
|
|
this.statsRepo.count(this.cfg.metricName, labels);
|
|
}
|
|
|
|
private normalizeCfg(cfg: HandleEvmConfig): HandleEvmConfig {
|
|
return {
|
|
filter: {
|
|
addresses: cfg.filter.addresses.map((addr) => addr.toLowerCase()),
|
|
topics: cfg.filter.topics.map((topic) => topic.toLowerCase()),
|
|
},
|
|
metricName: cfg.metricName,
|
|
commitment: cfg.commitment,
|
|
chainId: cfg.chainId,
|
|
chain: cfg.chain,
|
|
abi: cfg.abi,
|
|
id: cfg.id,
|
|
};
|
|
}
|
|
}
|
|
|
|
export type HandleEvmConfig = {
|
|
filter: EvmTopicFilter;
|
|
metricName: string;
|
|
commitment: string;
|
|
chainId: number;
|
|
chain: string;
|
|
abi: string;
|
|
id: string;
|
|
};
|