What is the best way to tell if the node I am using is exposing the Parity trace methods?
One way I know if is to call a contract on Kovan and look for a revert reason that says to expose the trace methods, but this requires an RPC call and is not explicit (the call may fail for other reasons). Additionally, different clients (geth, party, etc.) return error messages, so this is not reliable. Is there a way to do this explicitly and/or without making an RPC call?
You can try running a trace cURL in your terminal to the node, like:
curl --data '{"method":"trace_transaction","params":["0x99ac150336f74125702bb87598677c97474c5783a9258049d98377ab0773f73d"],"id":1,"jsonrpc":"2.0"}' -H "Content-Type: application/json" -X POST https://green-autumn-waterfall.quiknode.pro/2ab41411fc6296f2d7f82fa096304f21968913a8/
If it returns a response, then it works. Otherwise it should return an explicit error, letting you know the trace module is not enabled.
Also, check the documentation of your node provider to see if they support the call or not (or ask them directly).
disclosure: work for quiknode.io
-32601) but different for Quiknode (-32000). Do you know of a more standardized way of collecting this data without a bunch oof (if...else) statements?
Commented
Apr 22, 2020 at 18:08
-32601? Is there a canonical list of error codes?
Commented
Apr 23, 2020 at 3:38
{"jsonrpc":"2.0","error":{"code":-32601,"message":"Method not found"},"id":1}