public static async Task <Stream> QueryContinuousWithFilterAsync <TSource>(this IFlurlRequest request, CouchOptions options, ChangesFeedFilter filter, CancellationToken cancellationToken)
where TSource : CouchDocument
{
if (filter is DocumentIdsChangesFeedFilter documentIdsFilter)
{
return(await request
.SetQueryParam("filter", "_doc_ids")
.PostJsonStreamAsync(new ChangesFeedFilterDocuments(documentIdsFilter.Value), cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is SelectorChangesFeedFilter <TSource> selectorFilter)
{
MethodCallExpression whereExpression = Expression.Call(typeof(Queryable), nameof(Queryable.Where),
new[] { typeof(TSource) }, Expression.Constant(Array.Empty <TSource>().AsQueryable()), selectorFilter.Value);
var optimizer = new QueryOptimizer();
Expression optimizedQuery = optimizer.Optimize(whereExpression);
var jsonSelector = new QueryTranslator(options).Translate(optimizedQuery);
return(await request
.WithHeader("Content-Type", "application/json")
.SetQueryParam("filter", "_selector")
.PostStringStreamAsync(jsonSelector, cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is DesignChangesFeedFilter)
{
return(await request
.SetQueryParam("filter", "_design")
.GetStreamAsync(cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is ViewChangesFeedFilter viewFilter)
{
return(await request
.SetQueryParam("filter", "_view")
.SetQueryParam("view", viewFilter.Value)
.GetStreamAsync(cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
throw new InvalidOperationException($"Filter of type {filter.GetType().Name} not supported.");
}
public static async Task <Stream> QueryContinuousWithFilterAsync <TSource>(this IFlurlRequest request, IAsyncQueryProvider queryProvider, ChangesFeedFilter filter, CancellationToken cancellationToken)
where TSource : CouchDocument
{
if (filter is DocumentIdsChangesFeedFilter documentIdsFilter)
{
return(await request
.SetQueryParam("filter", "_doc_ids")
.PostJsonStreamAsync(new ChangesFeedFilterDocuments(documentIdsFilter.Value), cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is SelectorChangesFeedFilter <TSource> selectorFilter)
{
MethodCallExpression whereExpression = selectorFilter.Value.WrapInWhereExpression();
var jsonSelector = queryProvider.ToString(whereExpression);
return(await request
.WithHeader("Content-Type", "application/json")
.SetQueryParam("filter", "_selector")
.PostStringStreamAsync(jsonSelector, cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is DesignChangesFeedFilter)
{
return(await request
.SetQueryParam("filter", "_design")
.GetStreamAsync(cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
if (filter is ViewChangesFeedFilter viewFilter)
{
return(await request
.SetQueryParam("filter", "_view")
.SetQueryParam("view", viewFilter.Value)
.GetStreamAsync(cancellationToken, HttpCompletionOption.ResponseHeadersRead)
.ConfigureAwait(false));
}
throw new InvalidOperationException($"Filter of type {filter.GetType().Name} not supported.");
}