nova-ui/assets/services/provider.js

86 lines
2.3 KiB
JavaScript

import { ethers } from 'ethers'
import { fetchJson } from 'ethers/lib/utils'
import { numbers } from './constants'
const defaultRetryAttempt = 0
export class ExtendedProvider extends ethers.providers.StaticJsonRpcProvider {
constructor(url, network, fallbackRpcs) {
super(url, network)
this.fallbackRpcs = fallbackRpcs
}
async send(method, params, retryAttempt = defaultRetryAttempt) {
try {
return await super.send(method, params)
} catch (err) {
if (!retryAttempt) {
const TIME_OUT = 3000
await this.sleep(TIME_OUT)
if (this.fallbackRpcs) {
return await this.fallbackSend(method, params, this.fallbackRpcs)
}
return this.send(method, params, ++retryAttempt)
}
throw err
}
}
// eslint-disable-next-line
async fallbackSend(method, params, fallbackRpcs, retryAttempt = defaultRetryAttempt) {
function getResult(payload) {
if (payload.error) {
const error = new Error(payload.error.message)
error.code = payload.error.code
error.data = payload.error.data
// eslint-disable-next-line @typescript-eslint/no-throw-literal
throw error
}
return payload.result
}
try {
const request = {
method: method,
params: params,
id: this._nextId + numbers.ONE,
jsonrpc: '2.0',
}
const result = fetchJson({ url: fallbackRpcs[retryAttempt] }, JSON.stringify(request), getResult).then(
(result) => result,
(error) => {
throw error
},
)
return await result
} catch (err) {
retryAttempt += numbers.ONE
if (!fallbackRpcs[retryAttempt]) {
throw err
} else {
return await this.fallbackSend(method, params, fallbackRpcs, retryAttempt)
}
}
}
async sleep(ms) {
return await new Promise((resolve) => setTimeout(resolve, ms))
}
// private checkRpcError(err: { data: string; code: string; message: string }) {
// const code = String(err?.code)
// const data = err.data?.toLowerCase()
// const message = err.message?.toLowerCase()
// const ERROR_DATA = 'too many concurrent request'
// const ERROR_MESSAGE = 'timeout'
// const ERROR_CODE = '-32017'
// return (data?.includes(ERROR_DATA) || message?.includes(ERROR_MESSAGE)) && code === ERROR_CODE
// }
}