RpcEnvironment: implement set_user() and get_user()

src/cli/environment.rs

@@ -5,11 +5,15 @@ use serde_json::Value;
 
 pub struct CliEnvironment {
     result_attributes: HashMap<String, Value>,
+    user: Option<String>,
 }
 
 impl CliEnvironment {
     pub fn new() -> Self {
-        Self {  result_attributes: HashMap::new() }
+        Self {
+            result_attributes: HashMap::new(),
+            user: None,
+        }
     }
 }
 
@@ -27,4 +31,11 @@ impl RpcEnvironment for CliEnvironment {
         RpcEnvironmentType::CLI
     }
 
+    fn set_user(&mut self, user: Option<String>) {
+        self.user = user;
+    }
+
+    fn get_user(&self) -> Option<String> {
+        self.user.clone()
+    }
 }