fix(coprocessor): fhevm-listener, build contracts in build.rs

Author: rudy-6-4

.github/workflows/coprocessor-cargo-tests.yml

@@ -72,10 +72,6 @@ jobs:
       with:
         node-version: 20.x
 
-    - run: cp ./host-contracts/.env.example ./host-contracts/.env
-    - run: npm --prefix ./host-contracts ci --include=optional
-    - run: "cd host-contracts && npm install && npx hardhat compile"
-
     - name: Run tests
       run: |
         DATABASE_URL=postgresql://postgres:postgres@localhost:5432/coprocessor cargo test --release -- --test-threads=1

coprocessor/fhevm-engine/fhevm-listener/build.rs

@@ -4,10 +4,60 @@ use foundry_compilers::{
     Project, ProjectPathsConfig,
 };
 use semver::Version;
-use std::path::Path;
+use std::{env, fs, path::Path, process::Command};
+
+fn build_contracts() {
+    println!("cargo:rerun-if-changed=../../../host-contracts");
+    // Step 1: Copy ../../contracts/.env.example to ../../contracts/.env
+    let env_example = Path::new("../../../host-contracts/.env.example");
+    let env_dest = Path::new("../../../host-contracts/.env");
+    if !env_dest.exists() && env_example.exists() {
+        fs::copy(env_example, env_dest).expect("Failed to copy .env.example to .env");
+        println!("Copied .env.example to .env");
+    } else {
+        panic!("Error: .env.example not found in contracts directory");
+    }
+
+    // Change to the contracts directory for npm commands.
+    let contracts_dir = Path::new("../../../host-contracts");
+    if !contracts_dir.exists() {
+        panic!("Error: contracts directory not found");
+    }
+    env::set_current_dir(contracts_dir).expect("Failed to change to contracts directory");
+
+    // Step 2: Run `npm ci run `npm ci --include=optional` in ../../contracts
+    let npm_ci_status = Command::new("npm")
+        .args(["ci", "--include=optional"])
+        .status()
+        .expect("Failed to run npm ci");
+    if !npm_ci_status.success() {
+        panic!("Error: npm ci failed");
+    }
+    println!("Ran npm ci successfully");
+
+    // Step 3: Run `npm install && npx hardhat compile` in ../../contracts
+    let npm_install_status = Command::new("npm")
+        .arg("install")
+        .status()
+        .expect("Failed to run npm install");
+    if !npm_install_status.success() {
+        panic!("Error: npm install failed");
+    }
+    println!("Ran npm install successfully");
+
+    let hardhat_compile_status = Command::new("npx")
+        .args(["hardhat", "compile"])
+        .status()
+        .expect("Failed to run npx hardhat compile");
+    if !hardhat_compile_status.success() {
+        panic!("Error: npx hardhat compile failed");
+    }
+    println!("Ran npx hardhat compile successfully");
+}
 
 fn main() {
     println!("cargo::warning=build.rs run ...");
+    build_contracts();
     // build tests contracts
     let paths =
         ProjectPathsConfig::hardhat(Path::new(env!("CARGO_MANIFEST_DIR")))