feat: remove uuid crate dependency

`uuid` pulls in a bunch of WASM dependencies, even when Codspeed is pulled in with `default-features = false`. For some projects, that means vetting a lot of extra code.

This PR replaces the `uuid` dependency and uses `getrandom` to generate an UUIDv4-style string. (I'm not sure if anything depends on things being named with UUIDs; if not, this PR would be even simpler.)

Author: larseggert

Cargo.lock

@@ -34,7 +34,6 @@ codspeed = { path = "../codspeed", version = "=4.0.5" }
 assert_cmd = "2.0.15"
 fs_extra = "1.3.0"
 predicates = "3.1.2"
-uuid = { version = "1.10.0", features = ["v4"] }
 
 [features]
 vendored-openssl = []

crates/cargo-codspeed/Cargo.toml

@@ -7,7 +7,6 @@ use assert_cmd::Command;
 use fs_extra::dir::copy;
 use fs_extra::dir::create;
 use fs_extra::dir::remove;
-use uuid::Uuid;
 
 fn replace_in_file(path: &str, from: &str, to: &str) {
     let mut contents = std::fs::read_to_string(path).unwrap();
@@ -27,7 +26,8 @@ pub enum Project {
 
 pub fn setup(dir: &str, project: Project) -> String {
     //Create a new unique named temp directory
-    let tmp_dir = temp_dir().join(format!("cargo-codspeed-test-{}", Uuid::new_v4()));
+    let unique_id = codspeed::utils::generate_unique_id();
+    let tmp_dir = temp_dir().join(format!("cargo-codspeed-test-{unique_id}"));
     create(&tmp_dir, false).unwrap();
     let mut copy_opts = fs_extra::dir::CopyOptions::new();
     copy_opts.content_only = true;

crates/cargo-codspeed/tests/helpers.rs

@@ -23,10 +23,10 @@ colored = "2.0.0"
 glob = "0.3.2"
 libc = "^0.2"
 nix = { version = "0.30.1", features = ["time"] }
+getrandom = "0.2"
 serde = { workspace = true }
 serde_json = { workspace = true }
 statrs = { version = "0.18.0", default-features = false }
-uuid = { version = "1.12.1", features = ["v4"] }
 
 [[bench]]
 name = "native"

crates/codspeed/Cargo.toml

@@ -46,6 +46,29 @@ pub fn is_perf_enabled() -> bool {
     std::env::var("CODSPEED_PERF_ENABLED").is_ok()
 }
 
+/// Generate a statistically unique ID in a format resembling UUID v4.
+pub fn generate_unique_id() -> String {
+    // Generate random bytes for UUID v4
+    let mut bytes = [0u8; 16];
+    getrandom::getrandom(&mut bytes).expect("Failed to generate random bytes");
+
+    // Extract values from bytes
+    let r1 = u32::from_be_bytes([bytes[0], bytes[1], bytes[2], bytes[3]]);
+    let r2 = u16::from_be_bytes([bytes[4], bytes[5]]);
+    let r3 = u16::from_be_bytes([bytes[6], bytes[7]]);
+    let r4 = u16::from_be_bytes([bytes[8], bytes[9]]);
+    let r5 = u32::from_be_bytes([bytes[10], bytes[11], bytes[12], bytes[13]]);
+    let r6 = u16::from_be_bytes([bytes[14], bytes[15]]);
+
+    // Set version (4) and variant bits according to UUID v4 spec
+    let r3_v4 = (r3 & 0x0fff) | 0x4000; // Version 4
+    let r4_variant = (r4 & 0x3fff) | 0x8000; // Variant 10
+
+    // Format as standard UUID: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
+    // where y is one of 8, 9, A, or B
+    format!("{r1:08x}-{r2:04x}-{r3_v4:04x}-{r4_variant:04x}-{r5:08x}{r6:04x}")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/codspeed/src/utils.rs

@@ -7,6 +7,8 @@ use std::{
 use serde::{Deserialize, Serialize};
 use statrs::statistics::{Data, Distribution, Max, Min, OrderStatistics};
 
+use crate::utils::generate_unique_id;
+
 const IQR_OUTLIER_FACTOR: f64 = 1.5;
 const STDEV_OUTLIER_FACTOR: f64 = 3.0;
 
@@ -191,7 +193,7 @@ impl WalltimeBenchmark {
     fn dump_to_results(&self, workspace_root: &Path, scope: &str) {
         let output_dir = result_dir_from_workspace_root(workspace_root).join(scope);
         std::fs::create_dir_all(&output_dir).unwrap();
-        let bench_id = uuid::Uuid::new_v4().to_string();
+        let bench_id = generate_unique_id();
         let output_path = output_dir.join(format!("{bench_id}.json"));
         let mut writer = std::fs::File::create(&output_path).expect("Failed to create the file");
         serde_json::to_writer_pretty(&mut writer, self).expect("Failed to write the data");