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Add Eventsource.close() method #25

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Add Eventsource.close() method #25

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49b0a18
ignore pubspec.lock
Skycoder42 Mar 25, 2022
3bc9641
Add close method to event source
Skycoder42 Mar 26, 2022
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2 changes: 2 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -22,3 +22,5 @@ doc/api/
*.ipr
*.iws
/.dart_tool

pubspec.lock
16 changes: 15 additions & 1 deletion lib/eventsource.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,8 @@ class EventSource extends Stream<Event> {

EventSourceReadyState _readyState = EventSourceReadyState.CLOSED;

StreamSubscription<void>? _httpStreamSubscription;

http.Client client;
Duration _retryDelay = const Duration(milliseconds: 3000);
String? _lastEventId;
Expand Down Expand Up @@ -86,6 +88,12 @@ class EventSource extends Stream<Event> {
_streamController.stream.listen(onData,
onError: onError, onDone: onDone, cancelOnError: cancelOnError);

// close the event source and terminate the remote connection
Future<void> close() async {
await _httpStreamSubscription?.cancel();
await _streamController.close();
}

/// Attempt to start a new connection.
Future _start() async {
_readyState = EventSourceReadyState.CONNECTING;
Expand All @@ -109,7 +117,8 @@ class EventSource extends Stream<Event> {
}
_readyState = EventSourceReadyState.OPEN;
// start streaming the data
response.stream.transform(_decoder).listen((Event event) {
_httpStreamSubscription = response.stream.transform(_decoder).listen(
(Event event) {
_streamController.add(event);
_lastEventId = event.id;
},
Expand All @@ -125,6 +134,11 @@ class EventSource extends Stream<Event> {
Duration backoff = _retryDelay;
while (true) {
await new Future.delayed(backoff);
// stop retrying if the event source was closed
if (_streamController.isClosed) {
break;
}

try {
await _start();
break;
Expand Down