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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,89 +1,17 @@ | ||
| import Chainlink from './chainlink.js'; | ||
| import ENS from './ens.js'; | ||
| import FetchProvider from './provider.js'; | ||
| import { ArchiveNodeProvider, calcTransfersDiff } from './archive.js'; | ||
| import UniswapV2 from './uniswap-v2.js'; | ||
| import UniswapV3 from './uniswap-v3.js'; | ||
| import { Web3Provider, Web3CallArgs, hexToNumber } from '../utils.js'; | ||
|
|
||
| // There are many low level APIs inside which are not exported yet. | ||
| export { Chainlink, ENS, UniswapV2, UniswapV3 }; | ||
|
|
||
| // There is a lot features required for network to make this useful | ||
| // This is attempt to create them via small composable wrappers | ||
| export type FetchFn = ( | ||
| url: string, | ||
| opt?: Record<string, any> | ||
| ) => Promise<{ json: () => Promise<any> }>; | ||
| type Headers = Record<string, string>; | ||
| type JsonFn = (url: string, headers: Headers, body: unknown) => Promise<any>; | ||
| type PromiseCb<T> = { | ||
| resolve: (value: T | PromiseLike<T>) => void; | ||
| reject: (reason?: any) => void; | ||
| }; | ||
|
|
||
| function getJSONUsingFetch(fn: FetchFn): JsonFn { | ||
| return async (url: string, headers: Headers = {}, body: unknown) => { | ||
| const res = await fn(url, { | ||
| method: 'POST', | ||
| headers: { 'Content-Type': 'application/json', ...headers }, | ||
| body: JSON.stringify(body), | ||
| }); | ||
| return await res.json(); | ||
| }; | ||
| } | ||
|
|
||
| // Unsafe. TODO: inspect for race conditions and bugs. | ||
| function limitParallel(jsonFn: JsonFn, limit: number): JsonFn { | ||
| let cur = 0; | ||
| const queue: ({ url: string; headers: Headers; body: unknown } & PromiseCb<any>)[] = []; | ||
| const process = () => { | ||
| if (cur >= limit) return; | ||
| const next = queue.shift(); | ||
| if (!next) return; | ||
| try { | ||
| jsonFn(next.url, next.headers, next.body) | ||
| .then(next.resolve) | ||
| .catch(next.reject) | ||
| .finally(() => { | ||
| cur--; | ||
| process(); | ||
| }); | ||
| } catch (e) { | ||
| next.reject(e); | ||
| cur--; | ||
| } | ||
| cur++; | ||
| }; | ||
| return (url, headers, body) => { | ||
| return new Promise((resolve, reject) => { | ||
| queue.push({ url, headers, body, resolve, reject }); | ||
| process(); | ||
| }); | ||
| }; | ||
| } | ||
|
|
||
| type NetworkOpts = { | ||
| limitParallel?: number; | ||
| }; | ||
|
|
||
| export const FetchProvider = ( | ||
| fetch: FetchFn, | ||
| url: string, | ||
| headers: Headers = {}, | ||
| opts: NetworkOpts = {} | ||
| ): Web3Provider => { | ||
| let fn = getJSONUsingFetch(fetch); | ||
| if (opts.limitParallel) fn = limitParallel(fn, opts.limitParallel); | ||
| const jsonrpc = async (method: string, ...params: any[]) => { | ||
| const json = await fn(url, headers, { jsonrpc: '2.0', id: 0, method, params }); | ||
| if (json && json.error) | ||
| throw new Error(`FetchProvider(${json.error.code}): ${json.error.message || json.error}`); | ||
| return json.result; | ||
| }; | ||
| return { | ||
| ethCall: (args: Web3CallArgs, tag = 'latest') => | ||
| jsonrpc('eth_call', args, tag) as Promise<string>, | ||
| estimateGas: async (args: Web3CallArgs, tag = 'latest') => | ||
| hexToNumber(await jsonrpc('eth_estimateGas', args, tag)), | ||
| call: (method: string, ...args: any[]) => jsonrpc(method, ...args), | ||
| }; | ||
| export { | ||
| ArchiveNodeProvider, | ||
| calcTransfersDiff, | ||
| Chainlink, | ||
| ENS, | ||
| FetchProvider, | ||
| UniswapV2, | ||
| UniswapV3, | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import { Web3Provider, Web3CallArgs, hexToNumber } from '../utils.js'; | ||
|
|
||
| export type FetchFn = ( | ||
| url: string, | ||
| opt?: Record<string, any> | ||
| ) => Promise<{ json: () => Promise<any> }>; | ||
| type Headers = Record<string, string>; | ||
| type NetworkOpts = { | ||
| concurrencyLimit?: number; | ||
| headers?: Headers; | ||
| }; | ||
| type PromiseCb<T> = { | ||
| resolve: (value: T | PromiseLike<T>) => void; | ||
| reject: (reason?: any) => void; | ||
| }; | ||
|
|
||
| export default class FetchProvider implements Web3Provider { | ||
| private concurrencyLimit: number; | ||
| private currentlyFetching: number; | ||
| private headers: Headers; | ||
| constructor( | ||
| private fetchFunction: FetchFn, | ||
| readonly rpcUrl: string, | ||
| options: NetworkOpts = {} | ||
| ) { | ||
| this.concurrencyLimit = options.concurrencyLimit == null ? 0 : options.concurrencyLimit; | ||
| this.currentlyFetching = 0; | ||
| this.headers = options.headers || {}; | ||
| if (typeof this.headers !== 'object') throw new Error('invalid headers: expected object'); | ||
| } | ||
| private async fetchJson(body: unknown) { | ||
| const url = this.rpcUrl; | ||
| const args = { | ||
| method: 'POST', | ||
| headers: { 'Content-Type': 'application/json', ...this.headers }, | ||
| body: JSON.stringify(body), | ||
| }; | ||
| const res = await this.fetchFunction(url, args); | ||
| return res.json(); | ||
| } | ||
| private addToFetchQueue(body: unknown): Promise<any> { | ||
| if (this.concurrencyLimit === 0) return this.fetchJson(body); | ||
| const queue: ({ body: unknown } & PromiseCb<any>)[] = []; | ||
| const process = () => { | ||
| if (this.currentlyFetching >= this.concurrencyLimit) return; | ||
| const next = queue.shift(); | ||
| if (!next) return; | ||
| try { | ||
| this.fetchJson(next.body) | ||
| .then(next.resolve) | ||
| .catch(next.reject) | ||
| .finally(() => { | ||
| this.currentlyFetching--; | ||
| process(); | ||
| }); | ||
| } catch (e) { | ||
| next.reject(e); | ||
| this.currentlyFetching--; | ||
| } | ||
| this.currentlyFetching++; | ||
| }; | ||
| return new Promise((resolve, reject) => { | ||
| queue.push({ body, resolve, reject }); | ||
| process(); | ||
| }); | ||
| } | ||
| private async rpc(method: string, ...params: any[]): Promise<string> { | ||
| const body = { | ||
| jsonrpc: '2.0', | ||
| id: 0, | ||
| method, | ||
| params, | ||
| }; | ||
| const json = await this.addToFetchQueue(body); | ||
| if (json && json.error) | ||
| throw new Error(`FetchProvider(${json.error.code}): ${json.error.message || json.error}`); | ||
| return json.result; | ||
| } | ||
|
|
||
| ethCall(args: Web3CallArgs, tag = 'latest') { | ||
| return this.rpc('eth_call', args, tag); | ||
| } | ||
| async estimateGas(args: Web3CallArgs, tag = 'latest') { | ||
| return hexToNumber(await this.rpc('eth_estimateGas', args, tag)); | ||
| } | ||
| call(method: string, ...args: any[]) { | ||
| return this.rpc(method, ...args); | ||
| } | ||
| } |
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