Added fn-fdk-runtime header to response

Gaurav Saini · metamemelord · commit 0fc04398675c · 2021-08-13T00:12:16.000+05:30
diff --git a/Cargo.toml b/Cargo.toml
@@ -8,13 +8,14 @@ repository = "https://github.com/fnproject/fdk-rust"
 keywords = ["Fn", "serverless", "FaaS"]
 categories = ["web-programming", "development-tools"]
 license = "Apache-2.0"
+build = "src/build.rs"
 
 [badges]
 maintenance = { status = "experimental" }
 
 [dependencies]
 hyper = { version = "0.14", features = ["full"] }
-tokio = { version = "1.6", features = ["net"] }
+tokio = { version = "1.8", features = ["net"] }
 futures = "0.3"
 object-pool = "0.5"
 lazy_static = "1"
@@ -27,3 +28,6 @@ serde_plain = "0.3"
 serde_urlencoded = "0.7"
 clap = "2"
 thiserror = "1"
+
+[build-dependencies]
+built = "0.5.1"
diff --git a/images/init/template/src/main.rs b/images/init/template/src/main.rs
@@ -1,8 +1,8 @@
-use fdk::{Function, FunctionError, RuntimeContext};
+use fdk::{Function, FunctionError, Result, RuntimeContext};
 use tokio;
 
 #[tokio::main]
-async fn main() -> Result<(), FunctionError> {
+async fn main() -> Result<()> {
     if let Err(e) = Function::run(|_: &mut RuntimeContext, i: String| {
         Ok(format!(
             "Hello {}!",
diff --git a/src/build.rs b/src/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    built::write_built_file().expect("Failed to acquire build-time information");
+}
diff --git a/src/utils.rs b/src/utils.rs
@@ -3,8 +3,22 @@ use hyper::{
     header::{HeaderName, HeaderValue},
     Body, HeaderMap, Response, StatusCode,
 };
+use lazy_static::lazy_static;
 use std::str::FromStr;
 
+pub mod built_info {
+    include!(concat!(env!("OUT_DIR"), "/built.rs"));
+}
+
+lazy_static! {
+    static ref COMPILER_VERSION: String = built_info::RUSTC_VERSION
+        .split_ascii_whitespace()
+        .skip(1)
+        .next()
+        .map(|s| s.to_owned())
+        .unwrap_or_else(|| String::from("UNKNOWN"));
+}
+
 pub fn make_header_map_with_single_value(key: HeaderName, value: HeaderValue) -> HeaderMap {
     let mut header_map = HeaderMap::new();
     header_map.insert(key, value);
@@ -19,6 +33,10 @@ fn generic_response(status: StatusCode, body: Option<Body>, headers: HeaderMap)
             "Fn-Fdk-Version",
             HeaderValue::from_str(&format!("fdk-rust/{}", crate_version!())).unwrap(),
         );
+        headers.insert(
+            "Fn-Fdk-Runtime",
+            HeaderValue::from_str(&format!("rustc/{}", *COMPILER_VERSION)).unwrap(),
+        );
         let resp_headers = builder.headers_mut().unwrap();
         *resp_headers = headers;
     }

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+fn main() {`
	`2`	`+ built::write_built_file().expect("Failed to acquire build-time information");`
	`3`	`+}`