Health endpoint (#9847)

* Health endpoint.

* Fix chain handling.

* Update to latest json-rpc.

* Change dev chain detection.

* Fix test.

rpc/src/v1/helpers/errors.rs

@@ -52,6 +52,7 @@ mod codes {
 	pub const ENCODING_ERROR: i64 = -32058;
 	pub const FETCH_ERROR: i64 = -32060;
 	pub const NO_LIGHT_PEERS: i64 = -32065;
+	pub const NO_PEERS: i64 = -32066;
 	pub const DEPRECATED: i64 = -32070;
 }
 
@@ -500,3 +501,15 @@ pub fn on_demand_others(err: &OnDemandError) -> Error {
 	}
 }
 
+pub fn status_error(has_peers: bool) -> Error {
+	if has_peers {
+		no_work()
+	} else {
+		Error {
+			code: ErrorCode::ServerError(codes::NO_PEERS),
+			message: "Node is not connected to any peers.".into(),
+			data: None,
+		}
+	}
+}
+

rpc/src/v1/helpers/network_settings.rs

@@ -23,6 +23,8 @@ pub struct NetworkSettings {
 	pub name: String,
 	/// Name of the chain we are connected to
 	pub chain: String,
+	/// Is development chain
+	pub is_dev_chain: bool,
 	/// Networking port
 	pub network_port: u16,
 	/// Is JSON-RPC server enabled?
@@ -38,6 +40,7 @@ impl Default for NetworkSettings {
 		NetworkSettings {
 			name: "".into(),
 			chain: "foundation".into(),
+			is_dev_chain: false,
 			network_port: 30303,
 			rpc_enabled: true,
 			rpc_interface: "127.0.0.1".into(),