Build runtime in coordinator's build script

coordinator/build.rs

@@ -0,0 +1,24 @@
+use std::{path::PathBuf, process::Command};
+
+fn main() {
+    let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
+
+    build_runtime(&out_dir);
+}
+
+fn build_runtime(out_dir: &PathBuf) {
+    let mut cmd = Command::new(std::env::var("CARGO").unwrap());
+    cmd.arg("build");
+    cmd.arg("-p").arg("dora-runtime");
+    cmd.arg("--release");
+    let target_dir = out_dir.join("runtime");
+    cmd.arg("--target-dir").arg(&target_dir);
+    let status = cmd.status().unwrap();
+    if !status.success() {
+        panic!("runtime build failed");
+    }
+    println!(
+        "cargo:rustc-env=DORA_RUNTIME_PATH={}",
+        target_dir.join("release").join("dora-runtime").display()
+    );
+}

coordinator/src/main.rs

@@ -10,11 +10,12 @@ enum Command {
     #[clap(about = "Print Graph")]
     Visualize { dataflow: PathBuf },
     #[clap(about = "Run dataflow pipeline")]
-    Run {
-        dataflow: PathBuf,
-        #[clap(long)]
-        runtime: PathBuf,
-    },
+    Run { dataflow: PathBuf },
+}
+
+fn runtime_path() -> &'static Path {
+    const RUNTIME_PATH: &str = env!("DORA_RUNTIME_PATH");
+    Path::new(RUNTIME_PATH)
 }
 
 #[tokio::main]
@@ -32,7 +33,7 @@ async fn main() -> eyre::Result<()> {
         ```mermaid code block on GitHub to display it."
             );
         }
-        Command::Run { dataflow, runtime } => run_dataflow(dataflow.clone(), runtime)
+        Command::Run { dataflow } => run_dataflow(dataflow.clone(), runtime_path())
             .await
             .wrap_err_with(|| format!("failed to run dataflow at {}", dataflow.display()))?,
     }
@@ -40,7 +41,7 @@ async fn main() -> eyre::Result<()> {
     Ok(())
 }
 
-async fn run_dataflow(dataflow_path: PathBuf, runtime: PathBuf) -> eyre::Result<()> {
+async fn run_dataflow(dataflow_path: PathBuf, runtime: &Path) -> eyre::Result<()> {
     let Descriptor {
         mut communication,
         nodes,