Echo/reply working

src/usimp/mod.rs

@@ -1,7 +1,25 @@
 use json;
 
+static ENDPOINTS: [(&str, fn(json::JsonValue) -> json::JsonValue); 1] = [("echo", echo)];
+
 pub fn is_valid_endpoint(endpoint: &str) -> bool {
+    for (name, _func) in &ENDPOINTS {
+        if endpoint.eq(*name) {
+            return true;
+        }
+    }
     false
 }
 
-pub fn endpoint(endpoint: &str, input: json::object::Object) {}
+pub fn endpoint(endpoint: &str, input: json::JsonValue) -> json::JsonValue {
+    for (name, func) in &ENDPOINTS {
+        if endpoint.eq(*name) {
+            return func(input);
+        }
+    }
+    panic!("invalid endpoint, check with is_valid_endpoint")
+}
+
+pub fn echo(input: json::JsonValue) -> json::JsonValue {
+    input
+}