comment build.rs file

Author: darunrs

lazer/sdk/rust/protocol/build.rs

@@ -1,12 +1,22 @@
 use std::io::Result;
 
+/// Automatically runs during cargo build.
+/// Proto files for Lazer are defined in the lazer sdk folder in the proto/ subdirectory.
+/// Both JS and Rust SDKs read the proto files for generating types.
 fn main() -> Result<()> {
+    // Tell cargo to recompile if any .proto files change
+    println!("cargo:rerun-if-changed=proto/");
+
+    // Selects proto files to be read for compiling
     let proto_files = vec![
         "../../proto/pyth_lazer_transaction.proto",
         "../../proto/publisher_update.proto",
     ];
 
-    prost_build::compile_protos(&proto_files, &["../../proto"])?;
+    // Compiles protos and generates Rust types
+    // Generated types are present in the output folder
+    prost_build::compile_protos(&proto_files, &["../../proto"])
+        .expect("Failed to compile protos and generate types");
 
     Ok(())
 }