Unable to use wal2json plugin with the demo

[viggy28]

I cannot get the demo running with wal2json as the output plugin. The message format looks completely different between wal2json and pgoutput. FWIW, I tried with both the format versions of wal2json and also tried it on different PG versions.

It panics since the pglogrepl.Message is Unknown

panic: interface conversion: interface is nil, not pglogrepl.Message 

goroutine 1 [running]:
github.com/jackc/pglogrepl.Parse({0xc0000f401e, 0xa8, 0xa8})
        /Users/viggy28/go/pkg/mod/github.com/jackc/pglogrepl@v0.0.0-20230318140337-5ef673a9d169/message.go:649 +0x2b9
main.main()
        /Users/viggy28/Sourcecontrol/github.com/viggy28/pglogrepl/main.go:136 +0xdda

[alikonhz]

Hello @viggy28,
I'm not sure if the question is still relevant for you. But in order to use pglogrepl with wal2json you should not use pglogrepl.Parse(xld.WALData).
Instead, you should make a string from the xld.WALData (i.e. str := string(xld.WALData))
The string would contain actual output from the plugin in JSON format (e.g. {"action":"B"}, {"action":"C","origin":0}, etc.)