Add TOML and JSON support for quarkus configuration

[radcortez]

Originated by quarkusio/quarkus#14330

[hrstoyanov]

Thanks @radcortez . From my selfish point of view:

• YAML is a must (very popular because of Docker and K8s)
• JSON is a must (all AWS, MS Azure service configurations are using it)
• TOML is nice to have, it is the future!

[radcortez]

YAML is already covered, right? :)

[gjrtimmer]

@radcortez Well currently working on it, and I do not seem to get it to work, only keys which are written to consul as key.name.example=value are the ones that are being picked up by quarkus. How can I make YAML work?

To provide more context:

• I'm using quarkus.consul-config.properties-value-keys to provide the consul key to the properties file which is in consul K/V.
• Properties file in consul is marked as YAML.
• Properties are not being loaded, quarkus refused to start due to missing properties, only when I write the properties as key.subkey=value will the be picked up.

Keys written to K/V as:

app:
  subkey: value

are not being picked up by quarkus.

[gjrtimmer]

I think I have tracked down the issue as far as I understand it.

 @SuppressWarnings({ "rawtypes", "unchecked" })
        private static Map<String, String> readProperties(String rawData) {
            try (StringReader br = new StringReader(rawData)) {
                final Properties properties = new Properties();
                properties.load(br);
                return (Map<String, String>) (Map) properties;
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }

when using quarkus.consul-config.properties-value-keys you can define you properties in Consul web UI nicely in YAML, however this is forcing it to a properties map. So when using consul K/V as a backend for your app config it does not support YAML

[gjrtimmer]

@radcortez @hrstoyanov Please check

[radcortez]

@gjrtimmer I believe you wanted to add these comments to #46? This issue has nothing to do with either YAML or Consul.