From 720778b07cc9270710ae01bcde2ad426e91adb6b Mon Sep 17 00:00:00 2001
From: Yujia Qiao <rapiz3142@gmail.com>
Date: Tue, 25 Jan 2022 17:26:02 +0800
Subject: [PATCH] chore: clean up

---
 src/helper.rs | 75 +--------------------------------------------------
 1 file changed, 1 insertion(+), 74 deletions(-)

diff --git a/src/helper.rs b/src/helper.rs
index 7903312..6953919 100644
--- a/src/helper.rs
+++ b/src/helper.rs
@@ -1,9 +1,4 @@
-use std::{
-    collections::hash_map::DefaultHasher,
-    hash::{Hash, Hasher},
-    net::SocketAddr,
-    time::Duration,
-};
+use std::{net::SocketAddr, time::Duration};
 
 use anyhow::{anyhow, Result};
 use socket2::{SockRef, TcpKeepalive};
@@ -56,71 +51,3 @@ pub async fn udp_connect<A: ToSocketAddrs>(addr: A) -> Result<UdpSocket> {
     s.connect(addr).await?;
     Ok(s)
 }
-
-// FIXME: These functions are for the load balance for UDP. But not used for now.
-#[allow(dead_code)]
-pub fn hash_socket_addr(a: &SocketAddr) -> u64 {
-    let mut hasher = DefaultHasher::new();
-    a.hash(&mut hasher);
-    hasher.finish()
-}
-
-// Wait for the stabilization of https://doc.rust-lang.org/std/primitive.i64.html#method.log2
-#[allow(dead_code)]
-fn log2_floor(x: usize) -> u8 {
-    (x as f64).log2().floor() as u8
-}
-
-#[allow(dead_code)]
-pub fn floor_to_pow_of_2(x: usize) -> usize {
-    if x == 1 {
-        return 1;
-    }
-    let w = log2_floor(x);
-    1 << w
-}
-
-#[cfg(test)]
-mod test {
-    use crate::helper::{floor_to_pow_of_2, log2_floor};
-
-    #[test]
-    fn test_log2_floor() {
-        let t = [
-            (2, 1),
-            (3, 1),
-            (4, 2),
-            (8, 3),
-            (9, 3),
-            (15, 3),
-            (16, 4),
-            (1023, 9),
-            (1024, 10),
-            (2000, 10),
-            (2048, 11),
-        ];
-        for t in t {
-            assert_eq!(log2_floor(t.0), t.1);
-        }
-    }
-
-    #[test]
-    fn test_floor_to_pow_of_2() {
-        let t = [
-            (1 as usize, 1 as usize),
-            (2, 2),
-            (3, 2),
-            (4, 4),
-            (5, 4),
-            (15, 8),
-            (31, 16),
-            (33, 32),
-            (1000, 512),
-            (1500, 1024),
-            (2300, 2048),
-        ];
-        for t in t {
-            assert_eq!(floor_to_pow_of_2(t.0), t.1);
-        }
-    }
-}