feat: compile time optimization (#775)

crates/router_env/src/env.rs

@@ -91,6 +91,7 @@ pub fn workspace_path() -> PathBuf {
 /// - Timestamp of the latest git commit.
 ///
 /// Example: `0.1.0-abcd012-2038-01-19T03:14:08Z`.
+#[cfg(feature = "vergen")]
 #[macro_export]
 macro_rules! version {
     () => {
@@ -117,6 +118,7 @@ macro_rules! version {
 /// Example: `0.1.0-f5f383e-2022-09-04T11:39:37Z-1.63.0-x86_64-unknown-linux-gnu`
 ///
 
+#[cfg(feature = "vergen")]
 #[macro_export]
 macro_rules! build {
     () => {
@@ -141,7 +143,7 @@ macro_rules! build {
 ///
 /// Example: `f5f383ee7e36214d60ce3c6353b57db03ff0ceb1`.
 ///
-
+#[cfg(feature = "vergen")]
 #[macro_export]
 macro_rules! commit {
     () => {

crates/router_env/src/logger/formatter.rs

@@ -126,7 +126,9 @@ where
     hostname: String,
     env: String,
     service: String,
+    #[cfg(feature = "vergen")]
     version: String,
+    #[cfg(feature = "vergen")]
     build: String,
     default_fields: HashMap<String, Value>,
 }
@@ -159,7 +161,9 @@ where
         let pid = std::process::id();
         let hostname = gethostname::gethostname().to_string_lossy().into_owned();
         let service = service.to_string();
+        #[cfg(feature = "vergen")]
         let version = crate::version!().to_string();
+        #[cfg(feature = "vergen")]
         let build = crate::build!().to_string();
         let env = crate::env::which().to_string();
 
@@ -169,7 +173,9 @@ where
             hostname,
             env,
             service,
+            #[cfg(feature = "vergen")]
             version,
+            #[cfg(feature = "vergen")]
             build,
             default_fields,
         }
@@ -195,7 +201,9 @@ where
         map_serializer.serialize_entry(HOSTNAME, &self.hostname)?;
         map_serializer.serialize_entry(PID, &self.pid)?;
         map_serializer.serialize_entry(ENV, &self.env)?;
+        #[cfg(feature = "vergen")]
         map_serializer.serialize_entry(VERSION, &self.version)?;
+        #[cfg(feature = "vergen")]
         map_serializer.serialize_entry(BUILD, &self.build)?;
         map_serializer.serialize_entry(LEVEL, &format!("{}", metadata.level()))?;
         map_serializer.serialize_entry(TARGET, metadata.target())?;

crates/router_env/src/vergen.rs

@@ -6,6 +6,7 @@
 /// # Panics
 ///
 /// Panics if `vergen` fails to generate `cargo` build instructions.
+#[cfg(feature = "vergen")]
 #[allow(clippy::expect_used)]
 pub fn generate_cargo_instructions() {
     use std::io::Write;
@@ -31,3 +32,6 @@ pub fn generate_cargo_instructions() {
     )
     .expect("Failed to set `CARGO_PROFILE` environment variable");
 }
+
+#[cfg(not(feature = "vergen"))]
+pub fn generate_cargo_instructions() {}