listening to and decoding substrate events

gistfile1.txt

        println!("Got message: {}", msg);
        let retstr = msg.as_text().unwrap();
        let value: serde_json::Value = serde_json::from_str(retstr).unwrap();
        match value["id"].as_str() {
            Some(idstr) => { },
            _ => {
                // subscriptions
                println!("no id field found in response. must be subscription");
                println!("method: {:?}", value["method"].as_str());
                match value["method"].as_str() {
                    Some("state_storage") => {
                        let _changes = &value["params"]["result"]["changes"]; 
                        println!("state_storage changes: {:?}", _changes);
                        let _unhex = hexstr_to_vec(_changes[0][0].as_str().unwrap().to_string());
                        let mut _er_enc = _unhex.as_slice();
                        let _er = EventRecord::decode(&mut _er_enc);
                        println!("decoded: {:?}", _er)
                        //self.result.send(res.to_string()).unwrap();
                    }
                    _ => println!("unsupported method"),
                }
            },
        };