Merge pull request #34 from CleverCloud/devel/fdubois/chore/once-cell

Use `once_cell` instead of `lazy_static`

Author: FlorentinDUBOIS

Cargo.toml

@@ -29,7 +29,7 @@ hmac = { version = "^0.12.1", features = ["std"], optional = true }
 hyper = { version = "^0.14.25", default-features = false, optional = true }
 hyper-tls = { version = "^0.5.0", optional = true }
 hyper-proxy = { version = "^0.9.1", default-features = false, features = ["tls"], optional = true }
-lazy_static = { version = "^1.4.0", optional = true }
+once_cell = { version = "^1.17.1", optional = true }
 log = { version = "^0.4.17", optional = true }
 prometheus = { version = "^0.13.3", optional = true }
 serde = { version = "^1.0.155", features = ["derive"], optional = true }
@@ -68,5 +68,5 @@ client = [
 logging = ["log", "tracing/log-always"]
 trace = ["tracing", "tracing-futures"]
 tokio = ["tracing-futures/tokio"]
-metrics = ["lazy_static", "prometheus"]
+metrics = ["once_cell", "prometheus"]
 proxy = ["cidr", "headers", "hyper-proxy", "url"]

README.md

@@ -47,11 +47,11 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
 ## Features
 
 | name    | description                                                               |
-| ------- | ------------------------------------------------------------------------- |
+| ------- |---------------------------------------------------------------------------|
 | default | Default enable features are `client`, `logging`, `proxy`                  |
 | client  | The oauth 1.0a client implementation                                      |
 | logging | Use the `log` facility crate to print logs                                |
-| metrics | Use `lazy_static` and `prometheus` crates to register metrics             |
+| metrics | Use `once_cell` and `prometheus` crates to register metrics               |
 | proxy   | Enable the support of environment variable `http_proxy` and `https_proxy` |
 
 ### Metrics

src/client/mod.rs

@@ -27,11 +27,11 @@ use hyper::{
     header, Body, Method, StatusCode,
 };
 use hyper_tls::HttpsConnector;
-#[cfg(feature = "metrics")]
-use lazy_static::lazy_static;
 #[cfg(feature = "logging")]
 use log::{error, log_enabled, trace, Level};
 #[cfg(feature = "metrics")]
+use once_cell::sync::Lazy;
+#[cfg(feature = "metrics")]
 use prometheus::{opts, register_counter_vec, CounterVec};
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use sha2::Sha512;
@@ -45,21 +45,25 @@ pub mod proxy;
 // Telemetry
 
 #[cfg(feature = "metrics")]
-lazy_static! {
-    static ref CLIENT_REQUEST: CounterVec = register_counter_vec!(
+static CLIENT_REQUEST: Lazy<CounterVec> = Lazy::new(|| {
+    register_counter_vec!(
         opts!("oauth10a_client_request", "number of request on api"),
         &["endpoint", "method", "status"]
     )
-    .expect("metrics 'oauth10a_client_request' to not be initialized");
-    static ref CLIENT_REQUEST_DURATION: CounterVec = register_counter_vec!(
+    .expect("metrics 'oauth10a_client_request' to not be initialized")
+});
+
+#[cfg(feature = "metrics")]
+static CLIENT_REQUEST_DURATION: Lazy<CounterVec> = Lazy::new(|| {
+    register_counter_vec!(
         opts!(
             "oauth10a_client_request_duration",
             "duration of request on api"
         ),
         &["endpoint", "method", "status", "unit"]
     )
-    .expect("metrics 'oauth10a_client_request_duration' to not be initialized");
-}
+    .expect("metrics 'oauth10a_client_request_duration' to not be initialized")
+});
 
 // -----------------------------------------------------------------------------
 // Types