add dia

.gitignore

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+.idea

backends/dart_dia/.dockerignore

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+.dockerignore
+Dockerfile
+build/
+.dart_tool/
+.git/
+.github/
+.gitignore
+.idea/
+.packages

backends/dart_dia/.gitignore

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+# Files and directories created by pub.
+.dart_tool/
+.packages
+
+# Conventional directory for build output.
+build/

backends/dart_dia/Dockerfile

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+# Use latest stable channel SDK.
+FROM dart:stable AS build
+
+# Resolve app dependencies.
+WORKDIR /app
+COPY pubspec.* ./
+RUN dart pub get
+
+# Copy app source code (except anything in .dockerignore) and AOT compile app.
+COPY . .
+RUN dart compile exe bin/server.dart -o bin/server
+
+# Build minimal serving image from AOT-compiled `/server`
+# and the pre-built AOT-runtime in the `/runtime/` directory of the base image.
+FROM scratch
+COPY --from=build /runtime/ /
+COPY --from=build /app/bin/server /app/bin/
+
+# Start server.
+EXPOSE 8080
+CMD ["/app/bin/server"]

backends/dart_dia/README.md

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+# How to run?
+
+Download dependencies
+
+```sh
+dart pub get
+```
+
+Run server
+
+```sh
+dart bin\server.dart
+```

backends/dart_dia/analysis_options.yaml

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+# 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

backends/dart_dia/bin/server.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:dia/dia.dart';
+import 'package:dia_body/dia_body.dart';
+import 'package:dia_router/dia_router.dart';
+
+class ServerContext extends Context with Routing, ParsedBody {
+  ServerContext(super.request);
+
+  @override
+  String toString() {
+    var res = <String, String>{};
+    res['query'] = query.toString();
+    res['params'] = params.toString();
+    res['files'] = files.toString();
+    res['parsed'] = parsed.toString();
+
+    return res.toString();
+  }
+}
+
+void main(List<String> args) async {
+  // Use any available host or container IP (usually `0.0.0.0`).
+  final ip = "127.0.0.1";
+
+  final app = App<ServerContext>((req) => ServerContext(req));
+
+  final router = Router<ServerContext>('/');
+
+  router.get('/', (ctx, next) async {
+    ctx.body = json.encode({"response": 'Hello, World!'});
+  });
+  router.post('/echo', (ctx, next) async {
+    final map = ctx.parsed;
+    ctx.body = json.encode({"response": "Hello, ${map["name"]}!"});
+  });
+  router.post('/file_upload', (ctx, next) async {
+    final files = ctx.files;
+    ctx.body = files.length.toString();
+  });
+  router.post('/json_obj', (ctx, next) async {
+    final body = ctx.parsed;
+    ctx.body = body.length.toString();
+  });
+
+  app.use(body());
+  app.use(router.middleware);
+
+  // For running in containers, we respect the PORT environment variable.
+  final port = int.parse(Platform.environment['PORT'] ?? '8080');
+  app
+      .listen(ip, port)
+      .then((info) => print('Server listening on port $ip:$port'));
+}