Deal with more types & json encode values

Signed-off-by: Alex Snaps <[email protected]>

src/data/attribute.rs

@@ -4,6 +4,7 @@ use chrono::{DateTime, FixedOffset};
 use log::{debug, error};
 use protobuf::well_known_types::Struct;
 use proxy_wasm::hostcalls;
+use serde_json::Value;
 
 pub const KUADRANT_NAMESPACE: &str = "kuadrant";
 
@@ -179,12 +180,25 @@ fn process_metadata(s: &Struct, prefix: String) -> Vec<(String, String)> {
             format!("{prefix}\\.{key}")
         };
 
-        if value.has_string_value() {
-            result.push((current_prefix, value.get_string_value().to_string()));
-        } else if value.has_struct_value() {
+        let json: Option<Value> = if value.has_string_value() {
+            Some(value.get_string_value().into())
+        } else if value.has_bool_value() {
+            Some(value.get_bool_value().into())
+        } else if value.has_null_value() {
+            Some(Value::Null)
+        } else if value.has_number_value() {
+            Some(value.get_number_value().into())
+        } else {
+            None
+        };
+
+        if value.has_struct_value() {
             let nested_struct = value.get_struct_value();
             result.extend(process_metadata(nested_struct, current_prefix));
+        } else if let Some(v) = json {
+            result.push((current_prefix, serde_json::to_string(&v).unwrap()));
         }
+
     }
     result
 }