private async Task <QueryStream> ExecuteAsync(
graphql.ExecutionOptions options,
CancellationToken cancellationToken)
{
var result = await Executor.ExecuteAsync(options, cancellationToken);
var channel = Channel.CreateBounded <ExecutionResult>(1);
await channel.Writer.WriteAsync(result, cancellationToken);
channel.Writer.TryComplete();
_logger.Executed(options.OperationName, options.VariableValues, null);
return(new QueryStream(channel));
}
private async Task <QueryStream> SubscribeAsync(
graphql.ExecutionOptions options,
CancellationToken cancellationToken)
{
if (!cancellationToken.CanBeCanceled)
{
throw new InvalidOperationException(
"Invalid cancellation token. To unsubscribe the provided cancellation token must be cancellable.");
}
var unsubscribeSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var result = await Executor.SubscribeAsync(options, unsubscribeSource.Token);
_logger.Subscribed(options.OperationName, options.VariableValues, null);
unsubscribeSource.Token.Register(() =>
{
_logger?.Unsubscribed(
options.OperationName,
options.VariableValues,
null);
});
if (result.Errors != null && result.Errors.Any())
{
var channel = Channel.CreateBounded <ExecutionResult>(1);
await channel.Writer.WriteAsync(new ExecutionResult
{
Errors = result.Errors,
Extensions = result.Extensions
}, CancellationToken.None);
channel.Writer.TryComplete();
// unsubscribe
unsubscribeSource.Cancel();
return(new QueryStream(channel.Reader));
}
var stream = new QueryStream(result.Source);
return(stream);
}
