move rpc environment implementation to separate files

src/server/environment.rs

@@ -0,0 +1,25 @@
+use crate::api::router::*;
+
+use std::collections::HashMap;
+use serde_json::Value;
+
+pub struct RestEnvironment {
+    result_attributes: HashMap<String, Value>,
+}
+
+impl RestEnvironment {
+    pub fn new() -> Self {
+        Self {  result_attributes: HashMap::new() }
+    }
+}
+
+impl RpcEnvironment for RestEnvironment {
+
+    fn set_result_attrib(&mut self, name: &str, value: Value) {
+        self.result_attributes.insert(name.into(), value);
+    }
+
+    fn get_result_attrib(&self, name: &str) -> Option<&Value> {
+        self.result_attributes.get(name)
+    }
+}