lock: remove byteorder dependency from tests, use fs helper functions

This is the last use of Read/WriteBytesExt. The byteorder crate is great, but
we don't need an abstraction of endianness. Let's simply use the std functions.

Cargo.lock

@@ -1647,7 +1647,6 @@ dependencies = [
  "async-trait",
  "backoff",
  "blake2",
- "byteorder",
  "bytes 1.5.0",
  "chrono",
  "config",

Cargo.toml

@@ -23,7 +23,6 @@ assert_matches = "1.5.0"
 async-trait = "0.1.75"
 backoff = "0.4.0"
 blake2 = "0.10.6"
-byteorder = "1.5.0"
 bytes = "1.5.0"
 cargo_metadata = "0.17.0"
 clap = { version = "4.4.11", features = ["derive", "deprecated", "wrap_help"] }

lib/Cargo.toml

@@ -22,7 +22,6 @@ version_check = { workspace = true }
 async-trait = { workspace = true }
 backoff = { workspace = true }
 blake2 = { workspace = true }
-byteorder = { workspace = true }
 bytes = { workspace = true }
 chrono = { workspace = true }
 config = { workspace = true }

lib/src/lock.rs

@@ -23,11 +23,8 @@ pub use platform::FileLock;
 #[cfg(test)]
 mod tests {
     use std::cmp::max;
-    use std::fs::OpenOptions;
-    use std::thread;
     use std::time::Duration;
-
+    use std::{fs, thread};
-    use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 
     use super::*;
 
@@ -48,32 +45,21 @@ mod tests {
         let temp_dir = testutils::new_temp_dir();
         let data_path = temp_dir.path().join("test");
         let lock_path = temp_dir.path().join("test.lock");
-        let mut data_file = OpenOptions::new()
+        fs::write(&data_path, 0_u32.to_le_bytes()).unwrap();
-            .create(true)
-            .write(true)
-            .open(data_path.clone())
-            .unwrap();
-        data_file.write_u32::<LittleEndian>(0).unwrap();
         let num_threads = max(num_cpus::get(), 4);
         thread::scope(|s| {
             for _ in 0..num_threads {
-                let data_path = data_path.clone();
+                s.spawn(|| {
-                let lock_path = lock_path.clone();
+                    let _lock = FileLock::lock(lock_path.clone());
-                s.spawn(move || {
+                    let data = fs::read(&data_path).unwrap();
-                    let _lock = FileLock::lock(lock_path);
+                    let value = u32::from_le_bytes(data.try_into().unwrap());
-                    let mut data_file = OpenOptions::new()
-                        .read(true)
-                        .open(data_path.clone())
-                        .unwrap();
-                    let value = data_file.read_u32::<LittleEndian>().unwrap();
                     thread::sleep(Duration::from_millis(1));
-                    let mut data_file = OpenOptions::new().write(true).open(data_path).unwrap();
+                    fs::write(&data_path, (value + 1).to_le_bytes()).unwrap();
-                    data_file.write_u32::<LittleEndian>(value + 1).unwrap();
                 });
             }
         });
-        let mut data_file = OpenOptions::new().read(true).open(data_path).unwrap();
+        let data = fs::read(&data_path).unwrap();
-        let value = data_file.read_u32::<LittleEndian>().unwrap();
+        let value = u32::from_le_bytes(data.try_into().unwrap());
         assert_eq!(value, num_threads as u32);
     }
 }