Use automatically generated user agent for http requests based on crate metadata

src/transport/middleware/headers.rs

@@ -2,13 +2,15 @@ use async_trait::async_trait;
 use reqwest::{Request, Response};
 use reqwest_middleware::{Middleware, Next, Result};
 
-pub const USER_AGENT: &str = "osrs-prometheus-exporter";
-
-pub struct DefaultHeaderMiddleware {}
+pub struct DefaultHeaderMiddleware {
+    user_agent: String,
+}
 
 impl DefaultHeaderMiddleware {
     pub fn new() -> Self {
-        DefaultHeaderMiddleware {}
+        DefaultHeaderMiddleware {
+            user_agent: format!("{}/{}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"))
+        }
     }
 }
 
@@ -20,8 +22,8 @@ impl Middleware for DefaultHeaderMiddleware {
         extensions: &mut task_local_extensions::Extensions,
         next: Next<'_>,
     ) -> Result<Response> {
-        req.headers_mut()
-            .insert("User-Agent", USER_AGENT.parse().unwrap());
+        let ua = self.user_agent.as_str();
+        req.headers_mut().insert("User-Agent", ua.parse().unwrap());
 
         next.run(req, extensions).await
     }