unfinished

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+### Dart template
+# See https://www.dartlang.org/tools/private-files.html
+
+# Files and directories created by pub
+.packages
+.pub/
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/eventsource.iml" filepath="$PROJECT_DIR$/eventsource.iml" />
+    </modules>
+  </component>
+</project>

.idea/runConfigurations/build_dart.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="build.dart" type="DartCommandLineRunConfigurationType" factoryName="Dart Command Line Application" singleton="true" nameIsGenerated="true">
+    <option name="filePath" value="$PROJECT_DIR$/tool/build.dart" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method />
+  </configuration>
+</component>

.idea/runConfigurations/main_dart.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="main.dart" type="DartCommandLineRunConfigurationType" factoryName="Dart Command Line Application" singleton="true" nameIsGenerated="true">
+    <option name="filePath" value="$PROJECT_DIR$/example/main.dart" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method />
+  </configuration>
+</component>

.idea/runConfigurations/watch_dart.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="watch.dart" type="DartCommandLineRunConfigurationType" factoryName="Dart Command Line Application" singleton="true" nameIsGenerated="true">
+    <option name="filePath" value="$PROJECT_DIR$/tool/watch.dart" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method />
+  </configuration>
+</component>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

analysis_options.yaml

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+analyzer:
+  strong-mode: true

eventsource.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+  </component>
+</module>

example/main.dart

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+import 'dart:convert';
+import 'dart:io';
+import 'package:angel_eventsource/server.dart';
+import 'package:angel_framework/angel_framework.dart';
+import 'package:eventsource/eventsource.dart';
+import 'package:eventsource/publisher.dart';
+import 'package:logging/logging.dart';
+import 'pretty_logging.dart';
+
+main() async {
+  var app = new Angel();
+
+  app.use('/api/todos', new MapService());
+
+  var publisher = new AngelEventSourcePublisher(new EventSourcePublisher());
+  await app.configure(publisher.configureServer);
+
+  app.get('/sse', publisher.handleRequest);
+
+  app.logger = new Logger('angel_eventsource')..onRecord.listen(prettyLog);
+
+  var server = await app.startServer('127.0.0.1', 3000);
+  var url = Uri.parse('http://${server.address.address}:${server.port}');
+  print('Listening at $url');
+
+  /*
+  var sock = await Socket.connect(server.address, server.port);
+  sock
+    ..writeln('GET /sse HTTP/1.1')
+    ..writeln('Accept: text/event-stream')
+    ..writeln('Host: 127.0.0.1')
+    ..writeln()
+    ..flush();
+  sock.transform(UTF8.decoder).transform(const LineSplitter()).listen(print);
+  */
+
+  /*
+  var client = new HttpClient();
+  var rq = await client.openUrl('GET', url);
+  var rs = await rq.close();
+  rs.transform(UTF8.decoder).transform(const LineSplitter()).listen(print);
+  */
+
+
+  var eventSource = await EventSource.connect(url);
+
+  await for (var event in eventSource) {
+    print(event.data);
+  }
+  
+}

example/pretty_logging.dart

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+import 'package:console/console.dart';
+import 'package:logging/logging.dart';
+
+/// Prints the contents of a [LogRecord] with pretty colors.
+ prettyLog(LogRecord record) async {
+  var pen = new TextPen();
+  chooseLogColor(pen.reset(), record.level);
+  pen(record.toString());
+  
+  if (record.error != null)
+    pen(record.error.toString());
+  if (record.stackTrace != null)
+    pen(record.stackTrace.toString());
+  
+  pen();
+}
+
+/// Chooses a color based on the logger [level].
+void chooseLogColor(TextPen pen, Level level) {
+  if (level == Level.SHOUT)
+    pen.darkRed();
+  else if (level == Level.SEVERE)
+    pen.red();
+  else if (level == Level.WARNING)
+    pen.yellow();
+  else if (level == Level.INFO)
+    pen.magenta();
+  else if (level == Level.FINER)
+    pen.blue();
+  else if (level == Level.FINEST)
+    pen.darkBlue();
+}

lib/angel_eventsource.dart

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+export 'package:angel_websocket/angel_websocket.dart';

lib/server.dart

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+import 'dart:async';
+import 'package:angel_framework/angel_framework.dart';
+import 'package:angel_framework/hooks.dart' as hooks;
+import 'package:angel_websocket/server.dart';
+import 'package:eventsource/eventsource.dart';
+import 'package:eventsource/src/encoder.dart';
+import 'package:eventsource/publisher.dart';
+import 'package:json_god/json_god.dart' as god;
+
+class AngelEventSourcePublisher {
+  final EventSourcePublisher eventSourcePublisher;
+
+  /// Used to notify other nodes of an event's firing. Good for scaled applications.
+  final WebSocketSynchronizer synchronizer;
+
+  /// Serializes a [WebSocketEvent] to JSON.
+  ///
+  /// Defaults to [god.serialize].
+  final String Function(WebSocketEvent) serializer;
+  int _count = 0;
+
+  AngelEventSourcePublisher(this.eventSourcePublisher,
+      {this.synchronizer, this.serializer});
+
+  Future configureServer(Angel app) async {
+    await app.configure(hooks.hookAllServices((service) {
+      if (service is HookedService) {
+        var path =
+            app.services.keys.firstWhere((p) => app.services[p] == service);
+
+        service.after([
+          HookedServiceEvent.created,
+          HookedServiceEvent.modified,
+          HookedServiceEvent.updated,
+          HookedServiceEvent.removed,
+        ], (e) {
+          var event = new WebSocketEvent(
+            eventName: '${path.toString()}::${e.eventName}',
+            data: e.result,
+          );
+
+          _filter(RequestContext req, ResponseContext res) {
+            if (e.service.configuration.containsKey('sse:filter'))
+              return e.service.configuration['sse:filter'](e, req, res);
+            else if (e.params != null && e.params.containsKey('sse:filter'))
+              return e.params['sse:filter'](e, req, res);
+            else
+              return true;
+          }
+
+          var canSend = _filter(e.request, e.response);
+
+          if (canSend) {
+            batchEvent(event, e.request.properties['channel'] ?? '');
+          }
+        });
+      }
+    }));
+
+    if (synchronizer != null) {
+      var sub = synchronizer.stream.listen((e) => batchEvent(e, ''));
+      app.shutdownHooks.add((_) async {
+        sub.cancel();
+      });
+    }
+  }
+
+  Future batchEvent(WebSocketEvent event, String channel) async {
+    eventSourcePublisher.add(
+      new Event(
+        id: (_count++).toString(),
+        data: (serializer ?? god.serialize)(event),
+      ),
+      channels: [channel],
+    );
+  }
+
+  Future<bool> handleRequest(RequestContext req, ResponseContext res) async {
+    if (!req.accepts('text/event-stream', strict: false))
+      throw new AngelHttpException.badRequest();
+
+    res
+      ..headers.addAll({
+        'cache-control': 'no-cache, no-store, must-revalidate',
+        'content-type': 'text/event-stream',
+        'connection': 'keep-alive',
+      })
+      ..willCloseItself = true
+      ..end();
+
+    var acceptsGzip =
+        (req.headers['accept-encoding']?.contains('gzip') == true);
+
+    if (acceptsGzip) res.io.headers.set('content-encoding', 'gzip');
+    res.headers.forEach(res.io.headers.set);
+
+    var sock = res.io ?? await res.io.detachSocket();
+    sock.flush();
+
+    var eventSink = new EventSourceEncoder(compressed: acceptsGzip)
+        .startChunkedConversion(sock);
+
+    eventSourcePublisher.newSubscription(
+      onEvent: (e) {
+        try {
+          eventSink.add(e);
+          sock.flush();
+        } catch (_) {
+          // Ignore disconnect
+        }
+      },
+      onClose: eventSink.close,
+      channel: req.properties['channel'] ?? '',
+      lastEventId: req.headers.value('last-event-id'),
+    );
+
+    return false;
+  }
+}

pubspec.yaml

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+name: "angel_eventsource"
+dependencies: 
+  angel_client: "^1.0.0"
+  angel_framework: "^1.0.0-dev"
+  angel_model: "^1.0.0"
+  angel_serialize: "^1.0.0-alpha"
+  angel_websocket: "^1.0.0"
+  eventsource: "^0.1.0"
+  json_god: ^2.0.0-beta
+dev_dependencies: 
+  angel_serialize_generator: "^1.0.0-alpha"
+  build_runner: "^0.5.0"
+  console: "^2.2.4"
+  test: "^0.12.0"

tool/build.dart

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+import 'package:build_runner/build_runner.dart';
+import 'build_actions.dart';
+
+main() => build(buildActions, deleteFilesByDefault: true);

tool/build_actions.dart

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+import 'package:angel_serialize_generator/angel_serialize_generator.dart';
+import 'package:build_runner/build_runner.dart';
+import 'package:source_gen/source_gen.dart';
+
+final List<BuildAction> buildActions = [
+  new BuildAction(
+    new PartBuilder([
+      const JsonModelGenerator(autoIdAndDateFields: false),
+    ]),
+    'angel_eventsource',
+    inputs: const [
+      'lib/angel_eventsource.dart',
+    ],
+  ),
+];

tool/watch.dart

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+import 'package:build_runner/build_runner.dart';
+import 'build_actions.dart';
+
+main() => watch(buildActions, deleteFilesByDefault: true);