Add missing RPC required for relay (#57)

* add missing RPC required for relay

* cargo fmt --all

bridges/bin/node/node/Cargo.toml

@@ -12,6 +12,7 @@ name = "bridge-node"
 
 [dependencies]
 futures = "0.3.1"
+jsonrpc-core = "14.0.3"
 log = "0.4.8"
 structopt = "0.3.12"
 bridge-node-runtime = { version = "0.1.0", path = "../runtime" }
@@ -22,6 +23,11 @@ version = "0.8.0-alpha.2"
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
 git = "https://github.com/paritytech/substrate.git"
 
+[dependencies.sc-rpc]
+version = "2.0.0-alpha.2"
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate.git"
+
 [dependencies.sp-core]
 version = "2.0.0-alpha.2"
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
@@ -99,6 +105,11 @@ version = "0.8.0-alpha.2"
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
 git = "https://github.com/paritytech/substrate.git"
 
+[dependencies.substrate-frame-rpc-system]
+version = "2.0.0-alpha.2"
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate.git"
+
 [build-dependencies]
 vergen = "3.1.0"
 

bridges/bin/node/node/src/service.rs

@@ -80,6 +80,16 @@ macro_rules! new_full_start {
 			import_setup = Some((grandpa_block_import, grandpa_link));
 
 			Ok(import_queue)
+		})?
+		.with_rpc_extensions(|builder| -> Result<jsonrpc_core::IoHandler<sc_rpc::Metadata>, _> {
+			use substrate_frame_rpc_system::{FullSystem, SystemApi};
+
+			let mut io = jsonrpc_core::IoHandler::default();
+			io.extend_with(SystemApi::to_delegate(FullSystem::new(
+				builder.client().clone(),
+				builder.pool(),
+			)));
+			Ok(io)
 		})?;
 
 		(builder, import_setup, inherent_data_providers)

bridges/bin/node/runtime/Cargo.toml

@@ -65,6 +65,12 @@ default-features = false
 rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
 git = "https://github.com/paritytech/substrate/"
 
+[dependencies.frame-system-rpc-runtime-api]
+version = "2.0.0-alpha.2"
+default-features = false
+rev = "2afecf81ee19b8a6edb364b419190ea47c4a4a31"
+git = "https://github.com/paritytech/substrate/"
+
 [dependencies.pallet-timestamp]
 version = "2.0.0-alpha.2"
 default-features = false
@@ -177,6 +183,7 @@ std = [
 	"frame-executive/std",
 	"frame-support/std",
 	"frame-system/std",
+	"frame-system-rpc-runtime-api/std",
 	"pallet-grandpa/std",
 	"pallet-randomness-collective-flip/std",
 	"serde",

bridges/bin/node/runtime/src/lib.rs

@@ -330,6 +330,12 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl frame_system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Index> for Runtime {
+		fn account_nonce(account: AccountId) -> Index {
+			System::account_nonce(account)
+		}
+	}
+
 	impl sp_bridge_eth_poa::EthereumHeadersApi<Block> for Runtime {
 		fn best_block() -> (u64, sp_bridge_eth_poa::H256) {
 			BridgeEthPoA::best_block()