evm: eth_mining RPC implementation (#1892)

* eth_mining RPC implementation

* Formatting

src/masternodes/evm_ffi.cpp

@@ -1,5 +1,10 @@
 #include <masternodes/evm_ffi.h>
+#include <util/system.h>
 
 uint64_t getChainId() {
     return Params().GetConsensus().evmChainId;
 }
+
+bool isMining() {
+    return gArgs.GetBoolArg("-gen", false);
+}

src/masternodes/evm_ffi.h

@@ -4,5 +4,6 @@
 #include <chainparams.h>
 
 uint64_t getChainId();
+bool isMining();
 
 #endif // DEFI_EVM_FFI_H

src/rust/crates/ain-evm-cpp-ffi/src/lib.rs

@@ -6,11 +6,18 @@ mod ffi {
         include!("masternodes/evm_ffi.h");
 
         fn getChainId() -> u64;
+        fn isMining() -> bool;
     }
 }
 
 pub fn get_chain_id() -> Result<u64, Box<dyn Error>> {
     let chain_id = ffi::getChainId();
 
-    return Ok(chain_id);
+    Ok(chain_id)
+}
+
+pub fn is_mining() -> Result<bool, Box<dyn Error>> {
+    let is_mining = ffi::isMining();
+
+    Ok(is_mining)
 }

src/rust/crates/ain-grpc/src/rpc.rs

@@ -2,7 +2,7 @@ use crate::codegen::rpc::{
     ffi::{
         EthAccountsResult, EthBlockInfo, EthBlockNumberResult, EthCallInput, EthCallResult,
         EthGetBalanceInput, EthGetBalanceResult, EthGetBlockByHashInput, EthGetBlockByNumberInput,
-        EthTransactionInfo,
+        EthMiningResult, EthTransactionInfo,
     },
     EthService,
 };
@@ -41,6 +41,8 @@ pub trait EthServiceApi {
         handler: Arc<Handlers>,
         input: EthGetBlockByNumberInput,
     ) -> Result<EthBlockInfo, jsonrpsee_core::Error>;
+
+    fn Eth_Mining(handler: Arc<Handlers>) -> Result<EthMiningResult, jsonrpsee_core::Error>;
 }
 
 impl EthServiceApi for EthService {
@@ -185,6 +187,12 @@ impl EthServiceApi for EthService {
                 .collect::<Vec<String>>(),
         })
     }
+
+    fn Eth_Mining(handler: Arc<Handlers>) -> Result<EthMiningResult, jsonrpsee_core::Error> {
+        let mining = ain_evm_cpp_ffi::is_mining().unwrap();
+
+        Ok(EthMiningResult { is_mining: mining })
+    }
 }
 
 fn format_hash(hash: H256) -> String {

src/rust/protobuf/rpc/eth.proto

@@ -23,4 +23,6 @@ service eth {
   rpc Eth_BlockNumber(google.protobuf.Empty) returns (types.EthBlockNumberResult);
 
   rpc Eth_GetBlockByNumber(types.EthGetBlockByNumberInput) returns (types.EthBlockInfo);
+
+  rpc Eth_Mining(google.protobuf.Empty) returns (types.EthMiningResult);
 }