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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace Grpc.Core.Utils
{
/// <summary>
/// Extension methods that simplify work with gRPC streaming calls.
/// </summary>
public static class AsyncStreamExtensions
{
/// <summary>
/// Reads the entire stream and executes an async action for each element.
/// </summary>
public static async Task ForEachAsync<T>(this IAsyncStreamReader<T> streamReader, Func<T, Task> asyncAction)
where T : class
{
while (await streamReader.MoveNext().ConfigureAwait(false))
{
await asyncAction(streamReader.Current).ConfigureAwait(false);
}
}
/// <summary>
/// Reads the entire stream and creates a list containing all the elements read.
/// </summary>
public static async Task<List<T>> ToListAsync<T>(this IAsyncStreamReader<T> streamReader)
where T : class
{
var result = new List<T>();
while (await streamReader.MoveNext().ConfigureAwait(false))
{
result.Add(streamReader.Current);
}
return result;
}
/// <summary>
/// Writes all elements from given enumerable to the stream.
/// Completes the stream afterwards unless close = false.
/// </summary>
public static async Task WriteAllAsync<T>(this IClientStreamWriter<T> streamWriter, IEnumerable<T> elements, bool complete = true)
where T : class
{
foreach (var element in elements)
{
await streamWriter.WriteAsync(element).ConfigureAwait(false);
}
if (complete)
{
await streamWriter.CompleteAsync().ConfigureAwait(false);
}
}
/// <summary>
/// Writes all elements from given enumerable to the stream.
/// </summary>
public static async Task WriteAllAsync<T>(this IServerStreamWriter<T> streamWriter, IEnumerable<T> elements)
where T : class
{
foreach (var element in elements)
{
await streamWriter.WriteAsync(element).ConfigureAwait(false);
}
}
}
}
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