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