public Watcher(StreamReader streamReader, Action <WatchEventType, T> onEvent, Action <Exception> onError)
{
_streamReader = streamReader;
OnEvent += onEvent;
OnError += onError;
_cts = new CancellationTokenSource();
var token = _cts.Token;
Task.Run(async() =>
{
try
{
Watching = true;
while (!streamReader.EndOfStream)
{
if (token.IsCancellationRequested)
{
return;
}
var line = await streamReader.ReadLineAsync();
try
{
var genericEvent = SafeJsonConvert.DeserializeObject <k8s.Watcher <KubernetesObject> .WatchEvent>(line);
if (genericEvent.Object.Kind == "Status")
{
var statusEvent = SafeJsonConvert.DeserializeObject <k8s.Watcher <V1Status> .WatchEvent>(line);
var exception = new KubernetesException(statusEvent.Object);
this.OnError?.Invoke(exception);
}
else
{
var @event = SafeJsonConvert.DeserializeObject <k8s.Watcher <T> .WatchEvent>(line);
this.OnEvent?.Invoke(@event.Type, @event.Object);
}
}
catch (Exception e)
{
// error if deserialized failed or onevent throws
OnError?.Invoke(e);
}
}
}
catch (Exception e)
{
// error when transport error, IOException ect
OnError?.Invoke(e);
}
finally
{
Watching = false;
}
}, token);
}
internal static async IAsyncEnumerable <(WatchEventType, T)> CreateWatchEventEnumerator(
Func <Task <TextReader> > streamReaderCreator,
Action <Exception> onError = null,
[EnumeratorCancellation] CancellationToken cancellationToken = default)
{
Task <TR> AttachCancellationToken <TR>(Task <TR> task)
{
if (!task.IsCompleted)
{
// here to pass cancellationToken into task
return(task.ContinueWith(t => t.GetAwaiter().GetResult(), cancellationToken));
}
return(task);
}
using var streamReader = await AttachCancellationToken(streamReaderCreator ()).ConfigureAwait(false);
for (; ;)
{
// ReadLineAsync will return null when we've reached the end of the stream.
var line = await AttachCancellationToken(streamReader.ReadLineAsync()).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
if (line == null)
{
yield break;
}
WatchEvent @event = null;
try
{
var genericEvent = KubernetesJson.Deserialize <Watcher <KubernetesObject> .WatchEvent>(line);
if (genericEvent.Object.Kind == "Status")
{
var statusEvent = KubernetesJson.Deserialize <Watcher <V1Status> .WatchEvent>(line);
var exception = new KubernetesException(statusEvent.Object);
onError?.Invoke(exception);
}
else
{
@event = KubernetesJson.Deserialize <WatchEvent>(line);
}
}
catch (Exception e)
{
onError?.Invoke(e);
}
if (@event != null)
{
yield return(@event.Type, @event.Object);
}
}
}
private async Task WatcherLoop(CancellationToken cancellationToken)
{
// Make sure we run async
await Task.Yield();
try
{
Watching = true;
string line;
_streamReader = await _streamReaderCreator();
// ReadLineAsync will return null when we've reached the end of the stream.
while ((line = await _streamReader.ReadLineAsync().ConfigureAwait(false)) != null)
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
try
{
var genericEvent = SafeJsonConvert.DeserializeObject <k8s.Watcher <KubernetesObject> .WatchEvent>(line);
if (genericEvent.Object.Kind == "Status")
{
var statusEvent = SafeJsonConvert.DeserializeObject <k8s.Watcher <V1Status> .WatchEvent>(line);
var exception = new KubernetesException(statusEvent.Object);
this.OnError?.Invoke(exception);
}
else
{
var @event = SafeJsonConvert.DeserializeObject <k8s.Watcher <T> .WatchEvent>(line);
this.OnEvent?.Invoke(@event.Type, @event.Object);
}
}
catch (Exception e)
{
// error if deserialized failed or onevent throws
OnError?.Invoke(e);
}
}
}
catch (Exception e)
{
// error when transport error, IOException ect
OnError?.Invoke(e);
}
finally
{
Watching = false;
OnClosed?.Invoke();
}
}