dexorder/server
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initial ws server with lookupToken

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This commit is contained in:
Tim Olson
2023-08-28 20:25:49 -04:00
commit 2a0133e605
7 changed files with 341 additions and 0 deletions
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2
.env Normal file
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DEXORDER_PORT=3001
DEXORDER_CORS=http://localhost:3000

42
abi.js Normal file
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export const erc20Abi = [
'function name() view returns (string)',
'function symbol() view returns (string)',
'function decimals() view returns (uint8)',
'function totalSupply() view returns (uint256)',
'function balanceOf(address) view returns (uint256)',
'function transfer(address,uint256) returns (bool)',
'function transferFrom(address,address,uint256) returns (bool)',
'function approve(address,uint256) returns (bool success)',
'function allowance(address,address) view returns (uint256)',
'event Transfer(address indexed,address indexed,uint256)',
'event Approval(address indexed,address indexed,uint256)',
]
const TimedOrderSpec = '(' +
'address tokenIn,' +
'address tokenOut,' +
'uint24 fee,' +
'uint32 deadline,' +
'uint32 leeway,' +
'uint160 minSqrtPriceX96,' +
'uint160 maxSqrtPriceX96,' +
'uint8 numTranches,' +
'uint256 amount,' +
'bool amountIsInput' +
')'
export const timedOrderAbi = [
'event TimedOrderCreated (address owner, uint64 index, Spec spec)',
'event TimedOrderFilled (address owner, uint64 index, uint256 amountIn, uint256 amountOut)',
'event TimedOrderCompleted (address owner, uint64 index)',
'event TimedOrderError (address owner, uint64 index, string reason)',
`timedOrder(${TimedOrderSpec}) returns (uint64 index)`,
]
export const abi = {
'ERC20': erc20Abi,
'TimedOrder': timedOrderAbi,
}

21
blockchain.js Normal file
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import {ethers} from "ethers";
const providers = {} // indexed by chain id
export function provider(chainId) {
let result = providers[chainId]
if( result === undefined ) {
const rpc_url = process.env['DEXORDER_RPC_URL_'+chainId]
if( rpc_url === undefined ) {
console.error('No provider found for chainId',chainId)
return null
}
result = rpc_url.startsWith('ws') ?
new ethers.WebSocketProvider(rpc_url, chainId) :
new ethers.JsonRpcProvider(rpc_url, chainId)
providers[chainId] = result
}
return result
}

25
main.js Normal file
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import 'dotenv/config'
import { createServer } from "http";
import { Server } from "socket.io"
import {lookupToken} from "./token.js";
const options = {}
if( process.env.DEXORDER_CORS )
options['cors'] = {origin:process.env.DEXORDER_CORS}
const httpServer = createServer()
const io = new Server(httpServer, options)
io.on("connection", (socket) => {
// initially, only anonymous messages are allowed
socket.on('lookupToken', (chainId, address, callback) => {
lookupToken(chainId, address).then((result)=>callback(result)).catch(()=>callback(null))
})
// todo send known tokens or other initial config
socket.emit('welcome', {})
});
const port = parseInt(process.env.DEXORDER_PORT) || 3000;
httpServer.listen(port)
console.log('Started server on port '+port)
console.log(options)

18
package.json Normal file
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{
"name": "server",
"version": "1.0.0",
"description": "",
"main": "main.js",
"type": "module",
"scripts": {
"node": "node main.js"
},
"keywords": [],
"author": "",
"license": "unlicensed",
"dependencies": {
"dotenv": "^16.3.1",
"ethers": "^6.7.1",
"socket.io": "^4.7.2"
}
}

36
token.js Normal file
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// keeps a list of known tokens
// todo load standard known tokens
import {ethers} from "ethers";
import {erc20Abi} from "./abi.js";
import {provider} from "./blockchain.js";
const tokens = {
42161: {}
}
export async function lookupToken(chainId, address) {
console.log('lookupToken', chainId, address)
const chainTokens = tokens[chainId]
if( chainTokens === undefined )
return null
try {
let result = chainTokens[address]
console.log('found', result)
if (result === undefined) {
// todo look in tokens project
const addr = ethers.getAddress(address)
console.log('addr', addr)
const token = new ethers.Contract(addr, erc20Abi, provider(chainId))
const symbol = await token.symbol()
console.log('symbol', symbol)
const decimals = Number(await token.decimals())
result = {name: `${symbol} (${addr})`, symbol, decimals, address: addr}
chainTokens[addr] = result
return result
}
} catch {
return null
}
}

197
yarn.lock Normal file
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