Replace lazy_static & once_cell with std::sync::OnceLock

Cargo.toml

@@ -75,7 +75,6 @@ frunk = ["mysql_common/frunk"]
 binlog = ["mysql_common/binlog"]
 
 [dev-dependencies]
-lazy_static = "1.4.0"
 rand = "0.8.2"
 serde_derive = "1"
 time = "0.3"
@@ -90,7 +89,6 @@ flate2 = { version = "1.0", default-features = false }
 lru = "0.12"
 mysql_common = { version = "0.32", default-features = false }
 socket2 = "0.5.2"
-once_cell = "1.7.2"
 pem = "3"
 percent-encoding = "2.1.0"
 serde = "1"

src/buffer_pool/enabled.rs

@@ -1,18 +1,20 @@
 #![cfg(feature = "buffer-pool")]
 
 use crossbeam::queue::ArrayQueue;
-use once_cell::sync::Lazy;
 
-use std::{mem::take, ops::Deref, sync::Arc};
+use std::{
+    mem::take,
+    ops::Deref,
+    sync::{Arc, OnceLock},
+};
 
 const DEFAULT_MYSQL_BUFFER_POOL_CAP: usize = 128;
 const DEFAULT_MYSQL_BUFFER_SIZE_CAP: usize = 4 * 1024 * 1024;
 
-static BUFFER_POOL: Lazy<Arc<BufferPool>> = Lazy::new(Default::default);
-
 #[inline(always)]
 pub fn get_buffer() -> Buffer {
-    BUFFER_POOL.get()
+    static BUFFER_POOL: OnceLock<Arc<BufferPool>> = OnceLock::new();
+    BUFFER_POOL.get_or_init(Default::default).get()
 }
 
 #[derive(Debug)]

src/lib.rs

@@ -1060,8 +1060,6 @@ macro_rules! doctest_wrapper {
 
 #[cfg(test)]
 mod test_misc {
-    use lazy_static::lazy_static;
-
     use crate::{def_database_url, def_get_opts};
 
     #[allow(dead_code)]
@@ -1070,8 +1068,9 @@ mod test_misc {
         _dummy(crate::error::Error::FromValueError(crate::Value::NULL));
     }
 
-    lazy_static! {
-        pub static ref DATABASE_URL: String = def_database_url!();
+    #[allow(dead_code)]
+    fn database_url() {
+        def_database_url!();
     }
 
     def_get_opts!();