45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
// keeps a list of known tokens
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// todo load standard known tokens
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import {ethers} from "ethers";
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import {erc20Abi} from "./abi.js";
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import {getProvider} from "./blockchain.js";
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const std_arbitrum_tokens = {}
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const tokens = {
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42161: std_arbitrum_tokens,
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31337: std_arbitrum_tokens,
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}
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export function erc20(chainId, addr, provider=null) {
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return new ethers.Contract(addr, erc20Abi, provider?provider:getProvider(chainId));
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}
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export async function lookupToken(chainId, address) {
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// console.log('lookupToken', chainId, address)
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const chainTokens = tokens[chainId]
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if( chainTokens === undefined ) {
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console.log('no tokens for chain', chainId)
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return null
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}
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try {
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let result = chainTokens[address]
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// console.log('found', result)
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if (result === undefined) {
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// todo look in tokens project
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const addr = ethers.getAddress(address)
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// console.log('addr', addr)
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const token = erc20(chainId, addr)
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const symbol = await token.symbol()
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// console.log('symbol', symbol)
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const decimals = Number(await token.decimals())
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result = {name: null, symbol, decimals, address: addr}
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chainTokens[addr] = result
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}
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return result
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} catch {
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return null
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}
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}
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