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session.dart
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session.dart
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import 'dart:async';
import 'package:pedantic/pedantic.dart';
import '../message/abort.dart';
import '../message/abstract_message.dart';
import '../message/abstract_message_with_payload.dart';
import '../message/authenticate.dart';
import '../message/cancel.dart';
import '../message/challenge.dart';
import '../message/goodbye.dart';
import '../message/message_types.dart';
import '../message/unsubscribed.dart';
import '../message/welcome.dart';
import '../message/uri_pattern.dart';
import '../message/details.dart' as details_package;
import '../message/call.dart';
import '../message/event.dart';
import '../message/hello.dart';
import '../message/invocation.dart';
import '../message/publish.dart';
import '../message/published.dart';
import '../message/register.dart';
import '../message/registered.dart';
import '../message/result.dart';
import '../message/subscribe.dart';
import '../message/subscribed.dart';
import '../message/unregister.dart';
import '../message/unregistered.dart';
import '../message/unsubscribe.dart';
import '../message/error.dart';
import '../transport/abstract_transport.dart';
import '../authentication/abstract_authentication.dart';
class Session {
int id;
String realm;
String authId;
String authRole;
String authMethod;
String authProvider;
AbstractTransport _transport;
int nextCallId = 1;
int nextPublishId = 1;
int nextSubscribeId = 1;
int nextUnsubscribeId = 1;
int nextRegisterId = 1;
int nextUnregisterId = 1;
final Map<int, Registered> registrations = {};
final Map<int, Subscribed> subscriptions = {};
StreamSubscription<AbstractMessage> _transportStreamSubscription;
final _openSessionStreamController = StreamController.broadcast();
/// Starting the session will also start the authentication process.
static Future<Session> start(String realm, AbstractTransport transport,
{String authId,
List<AbstractAuthentication> authMethods,
Duration reconnect}) async {
/// The realm object is mandatory and must mach the uri pattern
assert(realm != null && UriPattern.match(realm));
/// The connection should have been established before initializing the
/// session.
assert(transport != null && transport.isOpen);
/// Initialize the session object with the realm it belongs to
final session = Session();
session.realm = realm;
session._transport = transport;
/// Initialize the sub protocol with a hello message
final hello = Hello(realm, details_package.Details.forHello());
if (authId != null) {
hello.details.authid = authId;
}
if (authMethods != null && authMethods.isNotEmpty) {
await authMethods[0].hello(realm, hello.details);
hello.details.authmethods = authMethods
.map<String>((authMethod) => authMethod.getName())
.toList();
}
/// Either return the welcome or execute a challenge before and eventually return the welcome after this
var welcomeCompleter = Completer<Session>();
session._transportStreamSubscription = transport.receive().listen(
(message) {
if (message is Challenge) {
final foundAuthMethod = authMethods
.where((authenticationMethod) =>
authenticationMethod.getName() == message.authMethod)
.first;
if (foundAuthMethod != null) {
try {
foundAuthMethod
.challenge(message.extra)
.then((authenticate) => session.authenticate(authenticate),
onError: (error) {
session._transport.send(
Abort(Error.AUTHORIZATION_FAILED, message: error.toString()));
session._transport.close();
});
} catch (exception) {
try {
transport.close();
} catch (ignore) {/* my be already closed */}
welcomeCompleter.completeError(Abort(Error.AUTHORIZATION_FAILED,
message: exception.toString()));
}
} else {
final goodbye = Goodbye(
GoodbyeMessage('Authmethod ${foundAuthMethod} not supported'),
Goodbye.REASON_GOODBYE_AND_OUT);
session._transport.send(goodbye);
welcomeCompleter.completeError(goodbye);
}
} else if (message is Welcome) {
session.id = message.sessionId;
session.authId = message.details.authid;
session.authMethod = message.details.authmethod;
session.authProvider = message.details.authprovider;
session.authRole = message.details.authrole;
session._transportStreamSubscription.onData((message) {
session._openSessionStreamController.add(message);
});
session._transportStreamSubscription.onDone(() {
session._openSessionStreamController.close();
});
welcomeCompleter.complete(session);
} else if (message is Abort) {
try {
transport.close();
} catch (ignore) {/* my be already closed */}
welcomeCompleter.completeError(message);
} else if (message is Goodbye) {
try {
transport.close();
} catch (ignore) {/* my be already closed */}
}
},
cancelOnError: true,
onError: (error) => transport.close(error: error),
onDone: () => transport.close());
if (!transport.isReady) {
await transport.onReady;
}
transport.send(hello);
return welcomeCompleter.future;
}
Future<dynamic> get onDisconnect => _transport.onDisconnect.future;
Future<dynamic> get onConnectionLost => _transport.onConnectionLost.future;
/// If there is a transport object that is opened and the incoming stream has not
/// been closed, this will return true.
bool isConnected() {
return _transport != null &&
_transport.isReady &&
_openSessionStreamController != null &&
!_openSessionStreamController.isClosed;
}
/// This sends the [authenticate] message to the transport outgoing stream.
void authenticate(Authenticate authenticate) {
_transport.send(authenticate);
}
/// This calls a [procedure] with the given [arguments] and/or [argumentsKeywords]
/// with the given [options]. The WAMP router will either respond with one or
/// more results or the caller may cancel the call by calling [cancelCompleter.complete()].
Stream<Result> call(String procedure,
{List<Object> arguments,
Map<String, Object> argumentsKeywords,
CallOptions options,
Completer<String> cancelCompleter}) async* {
var call = Call(nextCallId++, procedure,
arguments: arguments,
argumentsKeywords: argumentsKeywords,
options: options);
_transport.send(call);
if (cancelCompleter != null) {
unawaited(cancelCompleter.future.then((cancelMode) {
CancelOptions options;
if (cancelMode != null &&
(CancelOptions.MODE_KILL_NO_WAIT == cancelMode ||
CancelOptions.MODE_KILL == cancelMode ||
CancelOptions.MODE_SKIP == cancelMode)) {
options = CancelOptions();
options.mode = cancelMode;
}
var cancel = Cancel(call.requestId, options: options);
_transport.send(cancel);
}));
}
await for (AbstractMessageWithPayload result
in _openSessionStreamController.stream.where((message) =>
(message is Result && message.callRequestId == call.requestId) ||
(message is Error &&
message.requestTypeId == MessageTypes.CODE_CALL &&
message.requestId == call.requestId))) {
if (result is Result) {
yield result;
} else if (result is Error) {
throw result;
}
}
}
/// This subscribes the session to a [topic]. The subscriber may pass [options]
/// while subscribing. The resulting events are passed to the [Subscribed.eventStream].
/// The subscriber should therefore subscribe to that stream to receive the events.
Future<Subscribed> subscribe(String topic, {SubscribeOptions options}) async {
var subscribe = Subscribe(nextSubscribeId++, topic, options: options);
_transport.send(subscribe);
AbstractMessage subscribed = await _openSessionStreamController.stream
.where((message) =>
(message is Subscribed &&
message.subscribeRequestId == subscribe.requestId) ||
(message is Error &&
message.requestTypeId == MessageTypes.CODE_SUBSCRIBE &&
message.requestId == subscribe.requestId))
.first;
if (subscribed is Subscribed) {
subscriptions[subscribed.subscriptionId] = subscribed;
subscribed.eventStream =
_openSessionStreamController.stream.where((message) {
if (message is Unsubscribed &&
message.details?.subscription == subscribed.subscriptionId) {
subscriptions.remove(subscribed.subscriptionId);
subscribed.revoke(message.details.reason);
return false;
}
return message is Event &&
subscriptions[subscribed.subscriptionId] != null &&
message.subscriptionId == subscribed.subscriptionId;
}).cast();
return subscribed;
} else {
throw subscribed as Error;
}
}
/// This unsubscribes the session from a subscription. Use the [Subscribed.subscriptionId]
/// to unsubscribe.
Future<void> unsubscribe(int subscriptionId) async {
var unsubscribe = Unsubscribe(nextUnsubscribeId++, subscriptionId);
_transport.send(unsubscribe);
await _openSessionStreamController.stream.where((message) {
if (message is Unsubscribed &&
message.unsubscribeRequestId == unsubscribe.requestId) {
return true;
}
if (message is Error &&
message.requestTypeId == MessageTypes.CODE_UNSUBSCRIBE &&
message.requestId == unsubscribe.requestId) {
throw message;
}
return false;
}).first;
subscriptions.remove(subscriptionId);
}
/// This publishes an event to a [topic] with the given [arguments] and [argumentsKeywords].
Future<Published> publish(String topic,
{List<Object> arguments,
Map<String, Object> argumentsKeywords,
PublishOptions options}) {
var publish = Publish(nextPublishId++, topic,
arguments: arguments,
argumentsKeywords: argumentsKeywords,
options: options);
_transport.send(publish);
var publishStream = _openSessionStreamController.stream.where((message) {
if (message is Published &&
message.publishRequestId == publish.requestId) {
return true;
}
if (message is Error &&
message.requestTypeId == MessageTypes.CODE_PUBLISH &&
message.requestId == publish.requestId) {
throw message;
}
return false;
}).cast<Published>();
return publishStream.first;
}
/// This registers a [procedure] with the given [options] that may be called
/// by other sessions.
Future<Registered> register(String procedure,
{RegisterOptions options}) async {
var register = Register(nextRegisterId++, procedure, options: options);
_transport.send(register);
AbstractMessage registered = await _openSessionStreamController.stream
.where((message) =>
(message is Registered &&
message.registerRequestId == register.requestId) ||
(message is Error &&
message.requestTypeId == MessageTypes.CODE_REGISTER &&
message.requestId == register.requestId))
.first;
if (registered is Registered) {
registrations[registered.registrationId] = registered;
registered.procedure = procedure;
registered.invocationStream =
_openSessionStreamController.stream.where((message) {
if (message is Invocation &&
message.registrationId == registered.registrationId) {
// Check if there is a registration that has not been unregistered yet
if (registrations[registered.registrationId] != null) {
message.onResponse((message) => _transport.send(message));
return true;
} else {
_transport.send(Error(MessageTypes.CODE_INVOCATION,
message.requestId, {}, Error.NO_SUCH_REGISTRATION));
return false;
}
}
return false;
}).cast();
return registered;
} else {
throw registered as Error;
}
}
/// This unregisters a procedure by its [registrationId]. Use the [Registered.registrationId]
/// to unregister.
Future<void> unregister(int registrationId) async {
var unregister = Unregister(nextUnregisterId++, registrationId);
_transport.send(unregister);
await _openSessionStreamController.stream.where((message) {
if (message is Unregistered &&
message.unregisterRequestId == unregister.requestId) {
return true;
}
if (message is Error &&
message.requestTypeId == MessageTypes.CODE_UNREGISTER &&
message.requestId == unregister.requestId) {
throw message;
}
return false;
}).first;
registrations.remove(registrationId);
}
/// Sends a goodbye message and closes the transport after a given [timeout].
/// If no timeout is set, the client waits for the server to close the transport forever.
Future<void> close({String message = 'Regular closing', Duration timeout}) {
final goodbye =
Goodbye(GoodbyeMessage(message), Goodbye.REASON_GOODBYE_AND_OUT);
_transport.send(goodbye);
if (timeout != null) {
return Future.delayed(timeout, () => _transport.close());
}
return Future.value();
}
}