add http support

.gitignore

@@ -8,6 +8,10 @@ examples/CSharp/Example/obj
 examples/definition.json
 examples/Rust/Gen
 examples/Rust/Impl/target
+examples/Dart/out
 templates/CSharp/bin
 templates/CSharp/obj
 lib/
+templates/Dart/.dart_tool
+templates/Dart/.packages
+templates/Dart/pubspec.lock

examples/Dart/Test.dart

@@ -0,0 +1,42 @@
+import 'dart:async';
+import 'dart:io';
+
+import "./out/lib/example.dart";
+import "dart:convert";
+
+void main() async {
+  var str = StreamController<Map<String, dynamic>>();
+
+  var provider = ServiceProvider(str.stream);
+  var sock = await Socket.connect("127.0.0.1", 8859);
+
+  utf8.decoder.bind(sock).transform(new LineSplitter()).listen((line) {
+    str.add(jsonDecode(line));
+  });
+
+  provider.output.stream.listen((event) {
+    sock.writeln(jsonEncode(event));
+  });
+
+  var s = new TestServiceClient(provider);
+
+  var r = await s.AddValuesMultipleParams(10, 15);
+  print(r);
+
+  var r2 =
+      await s.AddValuesSingleParam(AddValueRequest(value1: 10, value2: 15));
+  print(r2?.value);
+
+  var catched = false;
+  await s.ThrowingError().catchError((err) {
+    catched = true;
+    print("Expected error was catched: " + err.toString());
+  });
+
+  if (!catched) {
+    throw Error();
+  }
+
+  await sock.close();
+  // exit(0);
+}

examples/Typescript/server.ts

@@ -0,0 +1,62 @@
+
+import * as net from "net";
+import { Server, AddValueRequest, AddValueResponse } from "./out";
+import * as readline from 'node:readline';
+
+
+const server = new Server.ServiceProvider();
+
+class TestService extends Server.TestService<undefined> {
+   async AddValuesSingleParam(
+      request: AddValueRequest,
+      ctx: undefined
+   ): Promise<AddValueResponse> {
+      return {
+         value: request.value1 + request!.value2,
+      };
+   }
+   async AddValuesMultipleParams(
+      value1: number,
+      value2: number,
+      ctx: undefined
+   ): Promise<number> {
+      return value1 + value2;
+   }
+
+   async ReturningVoid(param1) {
+      console.log("Calling Returning Void");
+   }
+
+   OnEvent(param1: string, ctx: undefined): void {
+      console.log("Received notification", param1);
+   }
+
+   async FunctionWithArrayAsParamAndReturn(vals1, vals2) {
+      return [...vals1, ...vals2];
+   }
+
+   async ThrowingError(ctx: undefined): Promise<void> {
+      throw new Error("Remote error!");
+   }
+}
+
+server.addService(new TestService());
+
+net.createServer((socket) => {
+   socket.on("error", console.error);
+
+   console.log("Connection from:", socket.remoteAddress);
+   const sess = server.getSession(msg => {
+      const s = JSON.stringify(msg);
+      console.log("Sending:", s);
+      socket.write(s + "\n");
+   });
+   const rl = readline.createInterface(socket);
+   rl.on("line", line => {
+      console.log("Receiving:", line);
+      sess.onMessage(JSON.parse(line));
+   })
+   rl.on("error", console.error);
+}).listen(8859).on("listening", () => {
+   console.log("Is listening on :8859");
+}).on("error", console.error)

examples/Typescript/test.ts

@@ -22,7 +22,7 @@ class TestService extends Server.TestService<undefined> {
       ctx: undefined
    ): Promise<AddValueResponse> {
       return {
-         value: request.value1 + request.value2,
+         value: request.value1 + request!.value2,
       };
    }
    async AddValuesMultipleParams(

examples/example.jrpc

@@ -2,6 +2,7 @@ import "./import";
 
 define csharp_namespace Example;
 define rust_crate example;
+define dart_library_name example;
 
 enum TestEnum {
    VAL1,

package.json

@@ -1,6 +1,6 @@
 {
    "name": "@hibas123/jrpcgen",
-   "version": "1.1.4",
+   "version": "1.1.5",
    "main": "lib/index.js",
    "license": "MIT",
    "packageManager": "yarn@3.1.1",
@@ -24,6 +24,9 @@
       "templates/CSharp/*.csproj",
       "templates/Rust/Cargo.toml",
       "templates/Rust/src/lib.rs",
+      "templates/Dart/service_client.dart",
+      "templates/Dart/base.dart",
+      "templates/Dart/pubspec.yaml",
       "examples/*.jrpcproj",
       "src/**",
       "tsconfig.json"

src/ir.ts

@@ -2,7 +2,7 @@ import type { Parsed, StatementNode } from "./parser";
 import dbg from "debug";
 const log = dbg("app");
 
-const BUILTIN = ["float", "int", "string", "boolean"];
+export const BUILTIN = ["float", "int", "string", "boolean"];
 
 export class IRError extends Error {
    constructor(public statement: StatementNode, message: string) {
@@ -316,7 +316,10 @@ export default function get_ir(parsed: Parsed): IR {
             builtin.push("bytes");
          }
       } else {
-         throw new IRError(statement, "Invalid statement!");
+         throw new IRError(
+            statement,
+            "Invalid statement: " + (statement as any).type
+         );
       }
    });
 

src/process.ts

@@ -2,6 +2,8 @@ import dbg from "debug";
 import * as FS from "fs";
 import Color from "chalk";
 import * as Path from "path";
+import * as Https from "https";
+import * as Http from "http";
 import tokenize, { TokenizerError } from "./tokenizer";
 import parse, { Parsed, ParserError } from "./parser";
 import get_ir, { IR, IRError } from "./ir";
@@ -13,6 +15,8 @@ import {
 import { CSharpTarget } from "./targets/csharp";
 import { RustTarget } from "./targets/rust";
 import { ZIGTarget } from "./targets/zig";
+import { DartTarget } from "./targets/dart";
+import { URL } from "url";
 
 class CatchedError extends Error {}
 
@@ -25,6 +29,7 @@ Targets.set("ts-node", NodeJSTypescriptTarget);
 Targets.set("c#", CSharpTarget as typeof CompileTarget);
 Targets.set("rust", RustTarget as typeof CompileTarget);
 Targets.set("zig", ZIGTarget as typeof CompileTarget);
+Targets.set("dart", DartTarget as typeof CompileTarget);
 
 function indexToLineAndCol(src: string, index: number) {
    let line = 1;
@@ -41,26 +46,63 @@ function indexToLineAndCol(src: string, index: number) {
    return { line, col };
 }
 
+function resolve(base: string, ...parts: string[]) {
+   if (base.startsWith("http://") || base.startsWith("https://")) {
+      let u = new URL(base);
+      for (const part of parts) {
+         u = new URL(part, u);
+      }
+      return u.href;
+   } else {
+      return Path.resolve(base, ...parts);
+   }
+}
+
+async function fetchFileFromURL(url: string) {
+   return new Promise<string>((yes, no) => {
+      const makeReq = url.startsWith("https://") ? Https.request : Http.request;
+      const req = makeReq(url, (res) => {
+         let chunks: Buffer[] = [];
+         res.on("data", (chunk) => {
+            chunks.push(Buffer.from(chunk));
+         });
+         res.on("error", no);
+         res.on("end", () => yes(Buffer.concat(chunks).toString("utf-8")));
+      });
+
+      req.on("error", no);
+      req.end();
+   });
+}
+
 const fileCache = new Map<string, string>();
-function getFile(name: string) {
+
+async function getFile(name: string) {
    if (fileCache.has(name)) return fileCache.get(name);
    else {
       try {
+         if (name.startsWith("http://") || name.startsWith("https://")) {
+            const data = await fetchFileFromURL(name);
+            fileCache.set(name, data);
+            return data;
+         } else {
             const data = FS.readFileSync(name, "utf-8");
             fileCache.set(name, data);
             return data;
+         }
       } catch (err) {
-         printError(new Error(`Cannot open file ${name};`), null, 0);
+         log(err);
+         await printError(new Error(`Cannot open file ${name};`), null, 0);
       }
    }
    return undefined;
 }
 
-function printError(err: Error, file: string | null, idx: number) {
+async function printError(err: Error, file: string | null, idx: number) {
    let loc = { line: 0, col: 0 };
    if (file != null) {
       const data = getFile(file);
-      if (data) loc = indexToLineAndCol(data, idx);
+      if (data) loc = indexToLineAndCol(await data, idx);
    }
 
    console.error(`${Color.red("ERROR: at")} ${file}:${loc.line}:${loc.col}`);
@@ -84,21 +126,21 @@ type ProcessContext = {
    processedFiles: Set<string>;
 };
 
-function processFile(
+async function processFile(
    ctx: ProcessContext,
    file: string,
    root = false
-): Parsed | null {
+): Promise<Parsed | null> {
-   file = Path.resolve(file);
+   file = resolve(file);
    if (ctx.processedFiles.has(file)) {
-      log("Skipping file %s since it has already be processed", file);
+      log("Skipping file %s since it has already been processed", file);
       return null;
    }
    ctx.processedFiles.add(file);
    log("Processing file %s", file);
 
-   const content = getFile(file);
+   const content = await getFile(file);
-   if (!content) throw new Error("Could not open file " + file);
+   if (content == undefined) throw new Error("Could not open file " + file);
    try {
       log("Tokenizing %s", file);
       const tokens = tokenize(content);
@@ -106,27 +148,29 @@ function processFile(
       const parsed = parse(tokens, file);
 
       log("Resolving imports of %s", file);
-      let resolved = parsed
+      let resolved: Parsed = [];
-         .map((statement) => {
+      for (const statement of parsed) {
          if (statement.type == "import") {
-               const base = Path.dirname(file);
+            let res: string;
-               const resolved = Path.resolve(
+            if (file.startsWith("http://") || file.startsWith("https://")) {
-                  Path.join(base, statement.path + ".jrpc")
+               res = resolve(file, statement.path + ".jrpc");
-               );
-               return processFile(ctx, resolved);
             } else {
-               return statement;
+               const base = Path.dirname(file);
+               res = resolve(base, statement.path + ".jrpc");
             }
-         })
+            resolved.push(...((await processFile(ctx, res)) || []));
-         .filter((e) => !!e)
+         } else {
-         .flat(1) as Parsed;
+            resolved.push(statement);
-      return resolved;
+         }
+      }
+
+      return resolved.filter((e) => !!e).flat(1) as Parsed;
    } catch (err) {
       if (err instanceof TokenizerError) {
-         printError(err, file, err.index);
+         await printError(err, file, err.index);
          if (!root) throw new CatchedError();
       } else if (err instanceof ParserError) {
-         printError(err, file, err.token.startIdx);
+         await printError(err, file, err.token.startIdx);
          if (!root) throw new CatchedError();
       } else if (root && err instanceof CatchedError) {
          return null;
@@ -136,7 +180,7 @@ function processFile(
    }
 }
 
-export default function startCompile(options: CompileOptions) {
+export default async function startCompile(options: CompileOptions) {
    const ctx = {
       options,
       processedFiles: new Set(),
@@ -146,14 +190,14 @@ export default function startCompile(options: CompileOptions) {
    if (options.input.endsWith(".json")) {
       ir = JSON.parse(FS.readFileSync(options.input, "utf-8"));
    } else {
-      const parsed = processFile(ctx, options.input, true);
+      const parsed = await processFile(ctx, options.input, true);
 
       if (!parsed) process.exit(1); // Errors should have already been emitted
       try {
          ir = get_ir(parsed);
       } catch (err) {
          if (err instanceof IRError) {
-            printError(
+            await printError(
                err,
                err.statement.location.file,
                err.statement.location.idx

src/targets/dart.ts

@@ -0,0 +1,279 @@
+import { TypeDefinition, ServiceDefinition, EnumDefinition, Step } from "../ir";
+
+import { CompileTarget } from "../compile";
+import { LineAppender, lineAppender } from "../utils";
+import chalk from "chalk";
+
+const conversion = {
+   boolean: "bool",
+   int: "int",
+   float: "double",
+   string: "String",
+   void: "void",
+   // bytes: "Uint8List", //TODO: Check this
+};
+
+function toDartType(type: string): string {
+   return (conversion as any)[type] || type;
+}
+
+export class DartTarget extends CompileTarget<{ dart_library_name: string }> {
+   name: string = "dart";
+
+   start(): void {
+      if (this.options.allow_bytes == true) {
+         throw new Error("Dart has no support for 'bytes' yet!");
+      }
+
+      if (!this.options.dart_library_name) {
+         throw new Error("Setting dart_library_name is required for DART target!");
+      }
+   }
+
+   getImport(name: string) {
+      return `import "./${name}.dart";`;
+   }
+
+   generateImports(a: lineAppender, def: TypeDefinition | ServiceDefinition) {
+      a(0, `import "./base.dart";`)
+      def.depends.forEach((dep) => {
+         a(0, this.getImport(dep));
+      });
+   }
+
+   getTypeParse(type: string, value: string) {
+      if (conversion[type]) {
+         return `${toDartType(type)}_fromJson(${value})`;
+      } else {
+         return `${toDartType(type)}.fromJson(${value})`;
+      }
+   }
+
+   generateType(definition: TypeDefinition): void {
+      const { a, getResult } = LineAppender();
+
+      this.generateImports(a, definition);
+
+      a(0, ``);
+      a(0, `class ${definition.name} {`);
+      for (const field of definition.fields) {
+         if (field.array) {
+            a(1, `List<${toDartType(field.type)}>? ${field.name};`);
+         } else if (field.map) {
+            a(
+               1,
+               `Map<${toDartType(field.map)},${toDartType(field.type)}>? ${field.name
+               };`
+            );
+         } else {
+            a(1, `${toDartType(field.type)}? ${field.name};`);
+         }
+      }
+
+      a(0, ``);
+      a(
+         1,
+         `${definition.name}({${definition.fields
+            .map((e) => `this.${e.name}`)
+            .join(", ")}});`
+      );
+      a(0, ``);
+      a(1, `${definition.name}.fromJson(Map<String, dynamic> json) {`);
+      for (const field of definition.fields) {
+         a(2, `if(json.containsKey("${field.name}")) {`);
+
+         if (field.array) {
+            a(3, `this.${field.name} = [];`);
+            a(3, `(json["${field.name}"] as List<dynamic>).forEach((e) => {`);
+            a(4, `this.${field.name}!.add(${this.getTypeParse(field.type, "e")})`);
+            a(3, `});`);
+         } else if (field.map) {
+            a(3, `this.${field.name} = {};`);
+            a(
+               3,
+               `(json["${field.name}"] as Map<${toDartType(
+                  field.map
+               )},dynamic>).forEach((key, value) => {`
+            );
+            a(4, `this.${field.name}![key] = ${this.getTypeParse(field.type, "value")}`);
+            a(3, `});`);
+         } else {
+            a(
+               3,
+               `this.${field.name} = ${this.getTypeParse(field.type, `json["${field.name}"]`)};`
+            );
+         }
+         a(2, `} else {`);
+         a(3, `this.${field.name} = null;`);
+         a(2, `}`);
+         a(0, ``);
+      }
+
+      a(1, `}`);
+
+      a(1, `Map<String, dynamic> toJson() {`);
+      a(2, `Map<String, dynamic> res = {};`);
+      for (const field of definition.fields) {
+         if (conversion[field.type]) {
+            a(2, `res["${field.name}"] = this.${field.name};`);
+         } else {
+            if (field.array) {
+               a(
+                  2,
+                  `res["${field.name}"] = this.${field.name}?.map((entry) => entry.toJson()).toList();`
+               );
+            } else if (field.map) {
+               // dict.map((key, value) => MapEntry(key, value.toString()));
+               a(
+                  2,
+                  `res["${field.name}"] = this.${field.name}?.map((key, value) => MapEntry(key, value.toJson()));`
+               );
+            } else {
+               a(2, `res["${field.name}"] = this.${field.name};`);
+            }
+         }
+      }
+      a(2, `return res;`);
+      a(1, `}`);
+
+      a(0, `}`);
+
+      this.writeFile(`lib/src/${definition.name}.dart`, getResult());
+   }
+
+   generateEnum(definition: EnumDefinition): void {
+      const { a, getResult } = LineAppender();
+
+      a(0, `enum ${definition.name} {`);
+      for (const entry of definition.values) {
+         const isLast =
+            definition.values[definition.values.length - 1] == entry;
+         a(1, `${entry.name}(${entry.value})${isLast ? ";" : ","}`);
+      }
+      a(0, ``);
+      a(1, `final int val;`);
+      a(1, `const ${definition.name}(int valT) : val= valT;`);
+      a(1, `static ${definition.name}? fromJson(int val) {`);
+      a(2, `switch(val){`);
+      for (const entry of definition.values) {
+         a(3, `case ${entry.value}:`);
+         a(4, `return ${definition.name}.${entry.name};`);
+      }
+      a(3, `default:`);
+      a(4, `return null;`);
+      a(2, `}`);
+      a(1, `}`);
+
+      a(0, ``);
+
+      a(1, `int toJson() {`);
+      a(2, `return this.val;`);
+      a(1, `}`);
+
+      a(0, ``);
+      a(0, `}`);
+
+      a(0, ``);
+
+      this.writeFile(`lib/src/${definition.name}.dart`, getResult());
+   }
+
+   generateServiceClient(definition: ServiceDefinition): void {
+      const { a, getResult } = LineAppender();
+
+      this.generateImports(a, definition);
+      a(0, `import "./service_client.dart";`);
+      a(0, ``);
+      a(0, `class ${definition.name}Client extends Service {`);
+      a(0, ``);
+
+      a(1, `${definition.name}Client(ServiceProvider provider):super(provider, "${definition.name}");`);
+
+      a(0, ``);
+
+      for (const func of definition.functions) {
+         const args = func.inputs.map(inp =>
+            (inp.array ? `List<${toDartType(inp.type)}>` : toDartType(inp.type)) + " " + inp.name
+         ).join(", ");
+
+         const asParams = func.inputs.map(e => e.name).join(", ");
+
+         if (!func.return) {
+            a(1, `void ${func.name}(${args}) {`)
+            a(2, `provider.sendNotification("${definition.name}.${func.name}", [${asParams}]);`);
+            a(1, `}`);
+         } else {
+            const baseReturnType = func.return.type != "void" ? (toDartType(func.return.type) + "?") : toDartType(func.return.type);
+            const returnType = func.return.array ? `List<${baseReturnType}>` : baseReturnType;
+
+            a(1, `Future<${returnType}> ${func.name}(${args}) async {`);
+            a(2, `var res = await this.provider.sendRequest("${definition.name}.${func.name}", [${asParams}]);`);
+            if (func.return.type !== "void") {
+               if(func.return.array) {
+                  a(2, `return res.map((entry) =>${this.getTypeParse(func.return.type, "entry")}).toList();`);
+               } else {
+                  a(2, `return ${this.getTypeParse(func.return.type, "res")};`);
+               }
+            }
+            a(1, `}`);
+         }
+         a(0, ``);
+      }
+      a(0, `}`);
+      a(0, ``);
+
+      this.writeFile(`lib/src/${definition.name}Client.dart`, getResult());
+   }
+
+   generateServiceServer(definition: ServiceDefinition): void {
+      console.log(
+         chalk.yellow("[DART] WARNING:"),
+         "DART support for services is not yet there. Service generation is currently limited to clients!"
+      );
+   }
+
+   generateService(definition: ServiceDefinition): void {
+      this.generateServiceClient(definition);
+      this.writeFile("lib/src/service_client.dart", this.getTemplate("Dart/service_client.dart"))
+   }
+
+   finalize(steps: Step[]): void {
+      const { a, getResult } = LineAppender();
+
+      a(0, `library ${this.options.dart_library_name};`)
+      a(0, ``);
+
+
+      let hasService = false;
+
+
+      steps.forEach(([type, def]) => {
+         switch (type) {
+            case "type":
+               a(0, `export 'src/${def.name}.dart';`);
+               break;
+            case "enum":
+               a(0, `export 'src/${def.name}.dart';`);
+               break;
+            case "service":
+               a(0, `export 'src/${def.name}Client.dart';`);
+               hasService = true;
+               break;
+            default:
+               console.warn(
+                  chalk.yellow("[DART] WARNING:"),
+                  "unimplemented step found:",
+                  type
+               );
+         }
+      });
+
+      if (hasService) {
+         a(0, `export 'src/service_client.dart';`)
+      }
+
+      this.writeFile(`lib/${this.options.dart_library_name}.dart`, getResult());
+      this.writeFile(`pubspec.yaml`, this.getTemplate("Dart/pubspec.yaml").replace("__NAME__", this.options.dart_library_name));
+      this.writeFile(`lib/src/base.dart`, this.getTemplate("Dart/base.dart"));
+   }
+}

src/targets/zig.ts

@@ -17,7 +17,7 @@ function toZigType(type: string): string {
    return (conversion as any)[type] || type;
 }
 
-export class ZIGTarget extends CompileTarget<{ csharp_namespace: string }> {
+export class ZIGTarget extends CompileTarget<{  }> {
    name: string = "zig";
 
    start(): void {

templates/Dart/analysis_options.yaml

@@ -0,0 +1,30 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

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/pubspec.yaml

@@ -0,0 +1,10 @@
+name: __NAME__
+description: JRPC
+version: 1.0.0
+
+environment:
+  sdk: '>=2.17.6 <3.0.0'
+
+dependencies:
+dev_dependencies:
+  lints: ^2.0.0

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;
+}