Add watcher base files and structures (#237)
* Add watcher base files and structures * Add missed files! * Update package.json info * Update PythUpdateEvent * Restructure the code * Fix division
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@ -0,0 +1,5 @@
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/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
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||||||
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module.exports = {
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||||||
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preset: 'ts-jest',
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testEnvironment: 'node',
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};
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Load Diff
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{
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||||||
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"name": "@pythnetwork/pyth-evm-watcher",
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||||||
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"version": "0.1.0",
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||||||
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"description": "Pyth EVM Watcher",
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||||||
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"homepage": "https://pyth.network",
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||||||
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"main": "lib/index.js",
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||||||
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"types": "lib/index.d.ts",
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||||||
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"files": [
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||||||
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"lib/**/*"
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||||||
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],
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||||||
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"repository": "https://github.com/pyth-network/pyth-crosschain",
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||||||
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"scripts": {
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||||||
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"test": "jest src/ --passWithNoTests",
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||||||
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"build": "tsc",
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||||||
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"start": "node lib/index.js",
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||||||
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"format": "prettier --write \"src/**/*.ts\"",
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||||||
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"lint": "eslint src/",
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||||||
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"prepare": "npm run build",
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||||||
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"prepublishOnly": "npm test && npm run lint",
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||||||
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"preversion": "npm run lint",
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"version": "npm run format && git add -A src"
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},
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"keywords": [
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"pyth",
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"oracle",
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"evm",
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||||||
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"ethereum"
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||||||
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],
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||||||
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"license": "Apache-2.0",
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||||||
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"devDependencies": {
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||||||
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"@types/jest": "^27.5.2",
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||||||
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||||||
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"@typescript-eslint/parser": "^5.29.0",
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||||||
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"eslint": "^8.18.0",
|
||||||
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"jest": "^27.5.1",
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||||||
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"prettier": "^2.7.1",
|
||||||
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"ts-jest": "^27.1.5",
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||||||
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"typescript": "^4.7.4"
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||||||
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},
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||||||
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"dependencies": {
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||||||
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"dotenv": "^16.0.1",
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||||||
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"web3": "^1.7.4",
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||||||
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"web3-eth-contract": "^1.7.4",
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||||||
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"web3-providers-ws": "^1.7.4",
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||||||
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"web3-utils": "^1.7.4"
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}
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||||||
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}
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[
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{
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"anonymous": false,
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"type": "bytes32"
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{
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"indexed": false,
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"name": "publishTime",
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"type": "uint64"
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}
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],
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"name": "PriceUpdate",
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"type": "event"
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},
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{
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"inputs": [
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{
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||||||
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"type": "bytes32"
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}
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],
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"name": "getCurrentPrice",
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"outputs": [
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{
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"components": [
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||||||
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{
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||||||
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"internalType": "int64",
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||||||
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||||||
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||||||
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],
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"internalType": "struct PythStructs.Price",
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"name": "price",
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"type": "tuple"
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||||||
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}
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||||||
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],
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"name": "getEmaPrice",
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"outputs": [
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{
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"components": [
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{
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"internalType": "int64",
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||||||
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"internalType": "struct PythStructs.Price",
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||||||
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||||||
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||||||
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||||||
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"type": "bytes32"
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||||||
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}
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||||||
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],
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||||||
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"name": "getPrevPriceUnsafe",
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||||||
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"outputs": [
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||||||
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{
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||||||
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"components": [
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||||||
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{
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||||||
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"internalType": "int64",
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||||||
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||||||
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||||||
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||||||
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},
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||||||
|
{
|
||||||
|
"internalType": "uint64",
|
||||||
|
"name": "publishTime",
|
||||||
|
"type": "uint64"
|
||||||
|
}
|
||||||
|
],
|
||||||
|
"stateMutability": "view",
|
||||||
|
"type": "function"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"inputs": [
|
||||||
|
{
|
||||||
|
"internalType": "bytes[]",
|
||||||
|
"name": "updateData",
|
||||||
|
"type": "bytes[]"
|
||||||
|
}
|
||||||
|
],
|
||||||
|
"name": "updatePriceFeeds",
|
||||||
|
"outputs": [],
|
||||||
|
"stateMutability": "nonpayable",
|
||||||
|
"type": "function"
|
||||||
|
}
|
||||||
|
]
|
|
@ -0,0 +1,20 @@
|
||||||
|
import { PythUpdateEvent } from "./pyth-update-event";
|
||||||
|
import { Watcher } from "./watcher";
|
||||||
|
|
||||||
|
export class Handler {
|
||||||
|
private watchers: Watcher[];
|
||||||
|
|
||||||
|
constructor() {
|
||||||
|
this.watchers = [];
|
||||||
|
}
|
||||||
|
|
||||||
|
dispatchEvent(event: PythUpdateEvent) {
|
||||||
|
for (let watcher of this.watchers) {
|
||||||
|
watcher.processEvent(event);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
subscribe(watcher: Watcher) {
|
||||||
|
this.watchers.push(watcher);
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,19 @@
|
||||||
|
import { Handler } from "./handler";
|
||||||
|
import { Listener } from "./listener";
|
||||||
|
import { envOrErr } from "./utils";
|
||||||
|
import { Logger } from "./watchers/logger";
|
||||||
|
|
||||||
|
console.log("Loading config file .env");
|
||||||
|
require("dotenv").config();
|
||||||
|
|
||||||
|
const handler = new Handler();
|
||||||
|
const listener = new Listener({
|
||||||
|
wsEndpoint: envOrErr('WS_ENDPOINT'),
|
||||||
|
pythContract: envOrErr('PYTH_CONTRACT'),
|
||||||
|
}, handler);
|
||||||
|
|
||||||
|
// Initialize Watchers
|
||||||
|
const logger = new Logger();
|
||||||
|
handler.subscribe(logger);
|
||||||
|
|
||||||
|
listener.start();
|
|
@ -0,0 +1,66 @@
|
||||||
|
import Web3 from "web3";
|
||||||
|
import { Contract, EventData } from "web3-eth-contract";
|
||||||
|
import { WebsocketProvider as WebsocketProviderType } from "web3-providers-ws";
|
||||||
|
import WebsocketProvider from "web3-providers-ws";
|
||||||
|
import { AbiItem } from "web3-utils";
|
||||||
|
import IPythABI from "./abi.json"
|
||||||
|
import { Handler } from "./handler";
|
||||||
|
|
||||||
|
type ListenerConfig = {
|
||||||
|
wsEndpoint: string,
|
||||||
|
pythContract: string
|
||||||
|
};
|
||||||
|
|
||||||
|
export class Listener {
|
||||||
|
private web3: Web3;
|
||||||
|
private pythContract: Contract;
|
||||||
|
private handler: Handler;
|
||||||
|
|
||||||
|
constructor(config: ListenerConfig, handler: Handler) {
|
||||||
|
// @ts-ignore The type definition is not correct and complains here. So it is ignored.
|
||||||
|
const wsProvider = new WebsocketProvider(config.wsEndpoint, {
|
||||||
|
clientConfig: {
|
||||||
|
keepalive: true,
|
||||||
|
keepaliveInterval: 30000
|
||||||
|
},
|
||||||
|
reconnect: {
|
||||||
|
auto: true,
|
||||||
|
delay: 1000,
|
||||||
|
onTimeout: true,
|
||||||
|
}
|
||||||
|
});
|
||||||
|
this.web3 = new Web3(wsProvider);
|
||||||
|
this.pythContract = new this.web3.eth.Contract(IPythABI as AbiItem[], config.pythContract);
|
||||||
|
this.handler = handler;
|
||||||
|
}
|
||||||
|
|
||||||
|
async getTxFee(txhash: string): Promise<number> {
|
||||||
|
const txReceipt = await this.web3.eth.getTransactionReceipt(txhash);
|
||||||
|
|
||||||
|
var gasPrice: number;
|
||||||
|
|
||||||
|
// In some networks such as BNB effective gas price is not provided in response.
|
||||||
|
if (txReceipt.effectiveGasPrice !== undefined) {
|
||||||
|
gasPrice = txReceipt.effectiveGasPrice;
|
||||||
|
} else {
|
||||||
|
const tx = await this.web3.eth.getTransaction(txhash);
|
||||||
|
gasPrice = Number(tx.gasPrice);
|
||||||
|
}
|
||||||
|
|
||||||
|
return gasPrice * txReceipt.gasUsed / Math.pow(10, 18);
|
||||||
|
}
|
||||||
|
|
||||||
|
start() {
|
||||||
|
this.web3.eth.subscribe('newBlockHeaders', (_error: Error, blockHeader) => {
|
||||||
|
console.dir(blockHeader);
|
||||||
|
});
|
||||||
|
const pythEmitter = this.pythContract.events.PriceUpdate(undefined, async (_error: Error, event: EventData) => {
|
||||||
|
console.dir(event);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
stop() {
|
||||||
|
const wsProvider = this.web3.currentProvider as WebsocketProviderType;
|
||||||
|
wsProvider.disconnect();
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,25 @@
|
||||||
|
import { HexString, UnixTimestamp } from "./utils"
|
||||||
|
|
||||||
|
export type PythUpdateEvent = {
|
||||||
|
txHash: HexString,
|
||||||
|
txFrom: HexString,
|
||||||
|
txTo: HexString,
|
||||||
|
chainId: number,
|
||||||
|
sequenceNumber: number,
|
||||||
|
sender: HexString, // Equal to txTo when a contract calls updatePriceFeeds and txFrom when someone calls Pyth contract directly
|
||||||
|
block: number,
|
||||||
|
timestamp: UnixTimestamp,
|
||||||
|
rawInput: string,
|
||||||
|
gasUsage: number,
|
||||||
|
txFee: number,
|
||||||
|
batchSize: number,
|
||||||
|
numUpdatedPrices: number,
|
||||||
|
prices: {
|
||||||
|
id: HexString,
|
||||||
|
updated: boolean,
|
||||||
|
publishTime: UnixTimestamp,
|
||||||
|
existingPublishTime: UnixTimestamp,
|
||||||
|
price: string,
|
||||||
|
conf: string,
|
||||||
|
}[]
|
||||||
|
}
|
|
@ -0,0 +1,15 @@
|
||||||
|
export type HexString = string;
|
||||||
|
export type UnixTimestamp = number;
|
||||||
|
|
||||||
|
export function sleep(ms: number) {
|
||||||
|
return new Promise((resolve) => setTimeout(resolve, ms));
|
||||||
|
}
|
||||||
|
|
||||||
|
// Shorthand for optional/mandatory envs
|
||||||
|
export function envOrErr(env: string): string {
|
||||||
|
let val = process.env[env];
|
||||||
|
if (!val) {
|
||||||
|
throw `environment variable "${env}" must be set`;
|
||||||
|
}
|
||||||
|
return String(process.env[env]);
|
||||||
|
}
|
|
@ -0,0 +1,5 @@
|
||||||
|
import { PythUpdateEvent } from "./pyth-update-event";
|
||||||
|
|
||||||
|
export interface Watcher {
|
||||||
|
processEvent(event: PythUpdateEvent): void;
|
||||||
|
}
|
|
@ -0,0 +1,8 @@
|
||||||
|
import { PythUpdateEvent } from "../pyth-update-event";
|
||||||
|
import { Watcher } from "../watcher";
|
||||||
|
|
||||||
|
export class Logger implements Watcher {
|
||||||
|
processEvent(event: PythUpdateEvent) {
|
||||||
|
console.dir(event);
|
||||||
|
}
|
||||||
|
}
|
|
@ -0,0 +1,13 @@
|
||||||
|
{
|
||||||
|
"compilerOptions": {
|
||||||
|
"target": "esnext",
|
||||||
|
"module": "commonjs",
|
||||||
|
"declaration": true,
|
||||||
|
"outDir": "./lib",
|
||||||
|
"strict": true,
|
||||||
|
"esModuleInterop": true,
|
||||||
|
"resolveJsonModule": true
|
||||||
|
},
|
||||||
|
"include": ["src"],
|
||||||
|
"exclude": ["node_modules"]
|
||||||
|
}
|
Loading…
Reference in New Issue