wip: refactoring all the structure and improve error messages

rpxy-lib/src/count.rs

@@ -0,0 +1,31 @@
+use std::sync::{
+  atomic::{AtomicUsize, Ordering},
+  Arc,
+};
+
+#[derive(Debug, Clone, Default)]
+/// Counter for serving requests
+pub struct RequestCount(Arc<AtomicUsize>);
+
+impl RequestCount {
+  pub fn current(&self) -> usize {
+    self.0.load(Ordering::Relaxed)
+  }
+
+  pub fn increment(&self) -> usize {
+    self.0.fetch_add(1, Ordering::Relaxed)
+  }
+
+  pub fn decrement(&self) -> usize {
+    let mut count;
+    while {
+      count = self.0.load(Ordering::Relaxed);
+      count > 0
+        && self
+          .0
+          .compare_exchange(count, count - 1, Ordering::Relaxed, Ordering::Relaxed)
+          != Ok(count)
+    } {}
+    count
+  }
+}