TypeError: api.rpc.net.version is not a function about smoldot

[tomaka]

From the point of view of smoldot, the only JSON-RPC functions that it supports are:

• The ones that Substrate supports, and they should be considered deprecated.
• https://paritytech.github.io/json-rpc-interface-spec/, which are correctly designed and should be preferred.

Sorry for the bad experience, but I'm not in any way responsible for this shitshow and I'm closing as "not my problem"

[tomaka]

I have no idea what rpc.net.version is even supposed to be.
If PolkadotJS calls a function that isn't supported by smoldot, you'll see an error in the logs, and also an error will be returned to PolkadotJS indicating that it's not supported (making this a PolkadotJS no matter what).

[gluneau]

Thanks for looking into this Pierre, I've found the docs for net_version and it returns the protocol version and that is the same as eth_chainId

So I tried to use const rawNetworkPrefix = await api?.rpc.eth.chainId(); and got the same similar message TypeError: api.rpc.eth.chainId is not a function while using the light rpc service. (Works fine under wss rpc)

curl --request POST \
     --url https://shiden-rpc.dwellir.com \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
     "id": 1,
     "jsonrpc": "2.0",
     "method": "net_version"
}
'
{"jsonrpc":"2.0","result":"336","id":1}

curl --request POST \
     --url https://shiden-rpc.dwellir.com \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
     "id": 1,
     "jsonrpc": "2.0",
     "method": "eth_chainId"
}
'
{"jsonrpc":"2.0","result":"0x150","id":1}

Both provided the same answer. (0x150 === 336) under wss rpc, and both broke under light rpc

So is it smoldot? or substrate_connect that is not translating the requests?
Can I curl my local substrate_connect?

[tomaka]

I don't know how https://shiden-rpc.dwellir.com is working, but if I send the request to rpc.polkadot.io I get an error about the method not existing. I have no idea where these JSON-RPC functions come from. Substrate doesn't support them.

Are you trying to achieve something specific by calling rpc.net.version? This function seems utterly useless to me, and I'm not going to support random JSON-RPC functions just for the sake of returning a dummy "1".