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
}