# Suggested GSN configuration

We have 3 different things we can "wrap" (or "gsn-enable"):

wrapContract( contract, gsnConfig)
wrapSigner( provider, gsnConfig)

// RelayProvider.newProvider()
wrapRpcProvider(web3Provider, gsnConfig)

We need to allow all of them to support configuring with paymaster.

**gsnConfig** type should be `Partial<GsnConfig> | ()=>Partial<GsnConfig> | ()=>Promise<Partial<GsnConfig>>`
(that is, the parameter is either actual configuration, as it is today, or a function returning the configuration

needed GSN changes:
- move "**dependencyOverrides**" into "config"
- add "**asyncInit(provider,config)**" dependency. this allows dynamically customize the configuration (like, paymaster address) from the network
- this method is called as first call in init() before resolving.
- the only field it can't customize is the asyncInit itself...

e.g.
hypothetical configuration for a **VerifyingPaymaster**.
- read from the network a json file with (paymaster,url) for each chain
- contact the url with the RelayRequest to fill paymasterData
- use with: `wrapContract(contact, GsnVerifyServer())`

function GsnVerifyServer(debug=false) {
    debuglog = debug ? console.debug: ()=>{}
    return {
      dependencies: {
        asyncInit: async (provider, config) => {
            net = await provider.getNetwork()
            resp = await axios.get(verifyConfigUrl)
            debuglog('net',net, 'config=', resp.data)
            const netconfig = resp.data.json[net.chainId]
            config.paymasterAddress = netconfig.paymaster
            config.dependencies.asyncPaymasterData = 
                (req) => {
                    debuglog('get paymasterdata')
                    return axios.get(netconfig.url, {req})
                }
            return config
        }
      }
   }
}

Actually, we can add a "**GsnTestNetwork**" config, which will automatically add an "AcceptEverythingPaymaster" for the current testnet (or throw an error on mainnet)