Tracing instrument

src/api_server/Cargo.toml

@@ -21,6 +21,8 @@ mmds = { path = "../mmds" }
 seccompiler = { path = "../seccompiler" }
 utils = { path = "../utils" }
 vmm = { path = "../vmm" }
+tracing = { version = "0.1.37", default-features = false, features = ["max_level_debug", "attributes"] }
 
 [dev-dependencies]
 libc = "0.2.117"
+log = "0.4.19"

src/api_server/src/lib.rs

@@ -43,6 +43,10 @@ pub struct ApiServer {
 }
 
 impl ApiServer {
+    #[tracing::instrument(
+        level = "trace",
+        skip(api_request_sender, vmm_response_receiver, to_vmm_fd)
+    )]
     /// Constructor for `ApiServer`.
     ///
     /// Returns the newly formed `ApiServer`.
@@ -59,6 +63,10 @@ impl ApiServer {
         }
     }
 
+    #[tracing::instrument(
+        level = "trace",
+        skip(self, server, process_time_reporter, seccomp_filter, api_payload_limit)
+    )]
     /// Runs the Api Server.
     ///
     /// # Arguments
@@ -128,6 +136,7 @@ impl ApiServer {
         }
     }
 
+    #[tracing::instrument(level = "trace", skip(self, request, request_processing_start_us))]
     /// Handles an API request received through the associated socket.
     pub fn handle_request(
         &mut self,
@@ -158,6 +167,7 @@ impl ApiServer {
         }
     }
 
+    #[tracing::instrument(level = "trace", skip(self, vmm_action, request_processing_start_us))]
     fn serve_vmm_action_request(
         &mut self,
         vmm_action: Box<VmmAction>,
@@ -199,13 +209,15 @@ impl ApiServer {
         response
     }
 
+    #[tracing::instrument(level = "trace", skip(status, body))]
     /// An HTTP response which also includes a body.
     pub(crate) fn json_response<T: Into<String> + Debug>(status: StatusCode, body: T) -> Response {
         let mut response = Response::new(Version::Http11, status);
         response.set_body(Body::new(body.into()));
         response
     }
 
+    #[tracing::instrument(level = "trace", skip(msg))]
     fn json_fault_message<T: AsRef<str> + serde::Serialize + Debug>(msg: T) -> String {
         json!({ "fault_message": msg }).to_string()
     }