Add service client support

templates/Dart/base.dart

@@ -0,0 +1,52 @@
+class JRPCError extends Error {
+  String message;
+  JRPCError(this.message);
+
+  @override
+  String toString() => message;
+}
+
+int? int_fromJson(dynamic val) {
+  if (val == null) {
+    return null;
+  } else if (val is int) {
+    return val;
+  } else if (val is double) {
+    return val.toInt();
+  } else {
+    throw JRPCError("Not a number!");
+  }
+}
+
+double? double_fromJson(dynamic val) {
+  if (val == null) {
+    return null;
+  } else if (val is int) {
+    return val.toDouble();
+  } else if (val is double) {
+    return val;
+  } else {
+    throw JRPCError("Not a number!");
+  }
+}
+
+bool? bool_fromJson(dynamic val) {
+  if (val == null) {
+    return null;
+  } else if (val is bool) {
+    return val;
+  } else {
+    throw JRPCError("Not a bool!");
+  }
+}
+
+String? String_fromJson(dynamic val) {
+  if (val == null) {
+    return null;
+  } else if (val is String) {
+    return val;
+  } else {
+    return val.toString(); // TODO: Either this or error
+    // throw JRPCError("Not a string!");
+  }
+}

templates/Dart/service_client.dart

@@ -0,0 +1,86 @@
+import "dart:async";
+import 'dart:math';
+
+import "./base.dart";
+
+abstract class Service {
+  String name;
+  ServiceProvider provider;
+
+  Service(this.provider, this.name) {
+    provider._services[name] = this;
+  }
+}
+
+class ServiceProvider {
+  final Map<String, Service> _services = {};
+  final Map<String, Completer<dynamic>> _requests = {};
+
+  StreamController<Map<String, dynamic>> output = StreamController();
+  late StreamSubscription s;
+
+  ServiceProvider(Stream<Map<String, dynamic>> input) {
+    s = input.listen(onMessage);
+  }
+
+  void onMessage(Map<String, dynamic> msg) {
+    // print("Working on message");
+    if (msg.containsKey("method")) {
+      if (msg.containsKey("id")) {
+        print("Message is request");
+        // Request, not supported!
+        return;
+      } else {
+        // print("Message is notification");
+        // Notification
+        // TODO: Implement
+      }
+    } else {
+      // print("Message is response");
+      // Response
+      var req = _requests[msg["id"]];
+
+      if (req == null) {
+        // print("Could not find related request. Ignoring");
+        return; // Irrelevant response
+      }
+      if (msg.containsKey("error")) {
+        //TODO:
+        req.completeError(JRPCError(msg["error"]["message"]));
+      } else {
+        req.complete(msg["result"]);
+      }
+    }
+  }
+
+  Future<dynamic> sendRequest(String method, dynamic params) {
+    var id = nanoid(10);
+    var req = {"jsonrpc": "2.0", "id": id, "method": method, "params": params};
+
+    var completer = Completer<dynamic>();
+
+    output.add(req);
+    _requests[id] = completer;
+
+    return completer.future;
+  }
+
+  void sendNotification(String method, dynamic params) {
+    var req = {"jsonrpc": "2.0", "method": method, "params": params};
+    output.add(req);
+  }
+}
+
+// Copied from: https://github.com/pd4d10/nanoid-dart (MIT License)
+final _random = Random.secure();
+const urlAlphabet =
+    'ModuleSymbhasOwnPr-0123456789ABCDEFGHNRVfgctiUvz_KqYTJkLxpZXIjQW';
+
+String nanoid([int size = 21]) {
+  final len = urlAlphabet.length;
+  String id = '';
+  while (0 < size--) {
+    id += urlAlphabet[_random.nextInt(len)];
+  }
+  return id;
+}