build(proto): move build script to separate pkg (#30)

It was impossible to publish the `archway-proto` crate because it
depends on the `archway-network` submodule, which is unavailable during
the isolated build process.

Following the same approach as `cosmos-rust` and other projects, moving
the proto compilation from the `build.rs` script in the package to a
standalone binary was necessary.

Cargo.toml

@@ -1,5 +1,9 @@
 [workspace]
-members = ["packages/*", "contracts/*"]
+members = [
+  "packages/*",
+  "contracts/*",
+  "proto-build"
+]
 resolver = "2"
 
 [workspace.package]

packages/proto/Cargo.toml

@@ -30,12 +30,6 @@ tonic = { version = "0.9.2", optional = true, default-features = false, features
 # [email protected] is the latest version for the cosmos-sdk 0.45.x protos
 cosmos-sdk-proto = { version = "0.18.0", default-features = false }
 
-[build-dependencies]
-error-chain = "0.12.4"
-glob = "0.3.1"
-regex = "1.9.3"
-tonic-build = "0.9.2"
-
 [features]
 default = ["grpc-transport"]
 grpc-transport = ["grpc", "tonic/transport", "cosmos-sdk-proto/grpc-transport"]

proto-build/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "proto-build"
+version = "0.1.0"
+edition = "2021"
+description = "Build script for archway-proto"
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+publish = false
+
+[dependencies]
+error-chain = "0.12.4"
+glob = "0.3.1"
+regex = "1.9.3"
+tonic-build = "0.9.2"

packages/proto/build.rs → proto-build/src/main.rs

@@ -10,8 +10,7 @@ use glob::glob;
 use regex::Regex;
 
 const ARCHWAY_DIR: &str = "archway-network";
-
-const OUT_DIR: &str = "src/proto";
+const OUT_DIR: &str = "packages/proto/src/proto";
 
 const EXCLUDED_PROTO_PACKAGES: &[&str] = &["google"];
 
@@ -26,10 +25,13 @@ error_chain! {
 
 fn main() -> Result<()> {
     let archway_dir = format!("{}/{}", workspace_root()?, ARCHWAY_DIR);
-    compile_proto(archway_dir.as_str())?;
-    cleanup(OUT_DIR)?;
-    apply_patches(OUT_DIR)?;
-    output_protocol_version(OUT_DIR, archway_dir.as_str())?;
+    let out_dir = format!("{}/{}", workspace_root()?, OUT_DIR);
+
+    compile_proto(out_dir.as_str(), archway_dir.as_str())?;
+    cleanup(out_dir.as_str())?;
+    apply_patches(out_dir.as_str())?;
+    output_protocol_version(out_dir.as_str(), archway_dir.as_str())?;
+
     Ok(())
 }
 
@@ -43,7 +45,7 @@ fn workspace_root() -> Result<String> {
     Ok(workspace_root.to_string_lossy().to_string())
 }
 
-fn compile_proto(archway_dir: &str) -> Result<()> {
+fn compile_proto(out_dir: &str, archway_dir: &str) -> Result<()> {
     let archway_proto_dir = format!("{}/proto", archway_dir);
     let protos = collect_proto_files(archway_proto_dir.as_str())?;
     let includes = &[
@@ -60,7 +62,8 @@ fn compile_proto(archway_dir: &str) -> Result<()> {
         .client_mod_attribute(".", "#[cfg_attr(docsrs, doc(cfg(feature = \"grpc\")))]")
         .server_mod_attribute(".", "#[cfg(feature = \"grpc\")]")
         .server_mod_attribute(".", "#[cfg_attr(docsrs, doc(cfg(feature = \"grpc\")))]")
-        .out_dir(OUT_DIR)
+        .emit_rerun_if_changed(false)
+        .out_dir(out_dir)
         .compile(protos.as_slice(), includes)?;
 
     Ok(())