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Fix exponential retries on parsing error #39

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Fix exponential retries on parsing error #39

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149 changes: 88 additions & 61 deletions lib/flutter_client_sse.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -77,70 +77,97 @@ class SSEClient {
Future<http.StreamedResponse> response = _client.send(request);

/// Listening to the response as a stream
response.asStream().listen((data) {
late StreamSubscription<http.StreamedResponse>
responseStreamSubscription;
responseStreamSubscription = response.asStream().listen((data) async {
if (data.headers["content-type"] != "text/event-stream") {
print("---ERROR---");
if (data.headers["connection"] != "keep-alive") {
final responseText =
await data.stream.transform(Utf8Decoder()).reduce(
(previous, element) => previous + element,
);
print(responseText);
}
_retryConnection(
method: method,
url: url,
header: header,
streamController: streamController,
);
responseStreamSubscription.cancel();
return;
}

/// Applying transforms and listening to it
data.stream
..transform(Utf8Decoder()).transform(LineSplitter()).listen(
(dataLine) {
if (dataLine.isEmpty) {
/// This means that the complete event set has been read.
/// We then add the event to the stream
streamController.add(currentSSEModel);
currentSSEModel = SSEModel(data: '', id: '', event: '');
return;
}
late StreamSubscription<String> transformedResponseStreamSubscription;
transformedResponseStreamSubscription = data.stream
.transform(Utf8Decoder())
.transform(LineSplitter())
.listen(
(dataLine) {
if (dataLine.isEmpty) {
/// This means that the complete event set has been read.
/// We then add the event to the stream
streamController.add(currentSSEModel);
currentSSEModel = SSEModel(data: '', id: '', event: '');
return;
}

/// Get the match of each line through the regex
Match match = lineRegex.firstMatch(dataLine)!;
var field = match.group(1);
if (field!.isEmpty) {
return;
}
var value = '';
if (field == 'data') {
// If the field is data, we get the data through the substring
value = dataLine.substring(
5,
);
} else {
value = match.group(2) ?? '';
}
switch (field) {
case 'event':
currentSSEModel.event = value;
break;
case 'data':
currentSSEModel.data =
(currentSSEModel.data ?? '') + value + '\n';
break;
case 'id':
currentSSEModel.id = value;
break;
case 'retry':
break;
default:
print('---ERROR---');
print(dataLine);
_retryConnection(
method: method,
url: url,
header: header,
streamController: streamController,
);
}
},
onError: (e, s) {
print('---ERROR---');
print(e);
_retryConnection(
method: method,
url: url,
header: header,
body: body,
streamController: streamController,
/// Get the match of each line through the regex
Match match = lineRegex.firstMatch(dataLine)!;
var field = match.group(1);
if (field!.isEmpty) {
return;
}
var value = '';
if (field == 'data') {
// If the field is data, we get the data through the substring
value = dataLine.substring(
5,
);
},
);
} else {
value = match.group(2) ?? '';
}
switch (field) {
case 'event':
currentSSEModel.event = value;
break;
case 'data':
currentSSEModel.data =
(currentSSEModel.data ?? '') + value + '\n';
break;
case 'id':
currentSSEModel.id = value;
break;
case 'retry':
break;
default:
print("---ERROR---");
print(dataLine);
transformedResponseStreamSubscription.cancel();
responseStreamSubscription.cancel();

_retryConnection(
method: method,
url: url,
header: header,
streamController: streamController,
);
}
},
onError: (e, s) {
print('---ERROR---');
print(e);
_retryConnection(
method: method,
url: url,
header: header,
body: body,
streamController: streamController,
);
},
);
}, onError: (e, s) {
print('---ERROR---');
print(e);
Expand Down