use git commit sha as version in traces (#287)

V3_GIT_ORIGIN_REV_ID: 9f0ff932d432802ddb9b6688ba7c0b738e2af201

v3/engine/Cargo.toml

@@ -2,6 +2,7 @@
 name = "engine"
 version = "3.0.0"
 edition = "2021"
+build = "build.rs"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

v3/engine/bin/engine/main.rs

@@ -20,8 +20,8 @@ use std::path::PathBuf;
 use std::{fmt::Display, sync::Arc};
 use tower_http::trace::TraceLayer;
 use tracing_util::{
-    add_event_on_active_span, set_status_on_current_span, ErrorVisibility, SpanVisibility,
-    TraceableError, TraceableHttpResponse,
+    add_event_on_active_span, set_status_on_current_span, AttributeVisibility, ErrorVisibility,
+    SpanVisibility, TraceableError, TraceableHttpResponse,
 };
 
 #[derive(Parser)]
@@ -42,6 +42,11 @@ struct EngineState {
     auth_config: AuthConfig,
 }
 
+const GIT_HASH_VERSION: &str = env!(
+    "GIT_HASH",
+    "Unable to start engine: unable to fetch the current git hash to use as trace version"
+);
+
 #[tokio::main]
 async fn main() {
     let server = ServerOptions::parse();
@@ -159,6 +164,11 @@ async fn graphql_request_tracing_middleware<B: Send>(
 
     Ok(tracer
         .in_span_async(path, SpanVisibility::User, || {
+            tracing_util::set_attribute_on_active_span(
+                AttributeVisibility::Internal,
+                "version",
+                GIT_HASH_VERSION,
+            );
             Box::pin(async move {
                 let response = next.run(request).await;
                 TraceableHttpResponse::new(response, path)

v3/engine/build.rs

@@ -0,0 +1,10 @@
+use std::process::Command;
+
+fn main() {
+    let output = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+}