evm: Enable C++ FFI

lib/ain-cpp-imports/build.rs

@@ -0,0 +1,27 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let manifest_path = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+    let lib_path = &manifest_path
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .join("src");
+
+    cxx_build::bridge("src/lib.rs")
+        .include(lib_path)
+        .flag_if_supported("-std=c++17")
+        .flag_if_supported("-Wno-unused-parameter")
+        .compile("ain-evm-cpp-ffi");
+
+    println!(
+        "cargo:rerun-if-changed={}/lib.rs",
+        lib_path.to_str().unwrap()
+    );
+    println!(
+        "cargo:rerun-if-changed={}/masternodes/ffi_exports.h",
+        lib_path.to_str().unwrap()
+    );
+}

lib/ain-cpp-imports/src/lib.rs

@@ -1,21 +1,21 @@
 use std::error::Error;
 
-// #[cxx::bridge]
-// mod ffi {
-//     unsafe extern "C++" {
-//         include!("masternodes/evm_ffi.h");
+#[cxx::bridge]
+mod ffi {
+    unsafe extern "C++" {
+        include!("masternodes/ffi_exports.h");
 
-//         fn getChainId() -> u64;
-//         fn isMining() -> bool;
-//     }
-// }
+        fn getChainId() -> u64;
+        fn isMining() -> bool;
+    }
+}
 
 pub fn get_chain_id() -> Result<u64, Box<dyn Error>> {
-    // let chain_id = ffi::getChainId();
-    Ok(0)
+    let chain_id = ffi::getChainId();
+    Ok(chain_id)
 }
 
 pub fn is_mining() -> Result<bool, Box<dyn Error>> {
-    // let is_mining = ffi::isMining();
-    Ok(true)
+    let is_mining = ffi::isMining();
+    Ok(is_mining)
 }

src/Makefile.am

@@ -164,7 +164,7 @@ DEFI_CORE_H = \
   masternodes/communityaccounttypes.h \
   masternodes/errors.h \
   masternodes/evm.h \
-  masternodes/evm_ffi.h \
+  masternodes/ffi_exports.h \
   masternodes/factory.h \
   masternodes/govvariables/attributes.h \
   masternodes/govvariables/icx_takerfee_per_btc.h \
@@ -396,7 +396,7 @@ libdefi_server_a_SOURCES = \
   masternodes/accountshistory.cpp \
   masternodes/anchors.cpp \
   masternodes/auctionhistory.cpp \
-  masternodes/evm_ffi.cpp \
+  masternodes/ffi_exports.cpp \
   masternodes/govvariables/attributes.cpp \
   masternodes/govvariables/icx_takerfee_per_btc.cpp \
   masternodes/govvariables/loan_daily_reward.cpp \

src/masternodes/evm_ffi.cpp → src/masternodes/ffi_exports.cpp

@@ -1,4 +1,4 @@
-#include <masternodes/evm_ffi.h>
+#include <masternodes/ffi_exports.h>
 #include <util/system.h>
 
 uint64_t getChainId() {