fix memory leak in closing connections

src/color.rs

@@ -0,0 +1,32 @@
+use std::fmt::Display;
+
+use rand::{distributions::Standard, prelude::Distribution};
+
+#[derive(Debug, PartialEq)]
+pub enum Color {
+    RGB24(u8, u8, u8),
+    RGBA32(u8, u8, u8, u8),
+    W8(u8),
+}
+
+impl Display for Color {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Color::RGB24(r, g, b) => write!(f, "#{:02X}{:02X}{:02X}FF", r, g, b),
+            Color::RGBA32(r, g, b, a) => write!(f, "#{:02X}{:02X}{:02X}{:02X}", r, g, b, a),
+            Color::W8(w) => write!(f, "#{:02X}{:02X}{:02X}FF", w, w, w),
+        }
+    }
+}
+
+impl Distribution<Color> for Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> Color {
+        let index: u8 = rng.gen_range(0..3);
+        match index {
+            0 => Color::W8(rng.gen()),
+            1 => Color::RGB24(rng.gen(), rng.gen(), rng.gen()),
+            2 => Color::RGBA32(rng.gen(), rng.gen(), rng.gen(), rng.gen()),
+            _ => unreachable!(),
+        }
+    }
+}