/// <summary>
/// Initialize the buffered range reader stream provided request URL.
/// </summary>
/// <param name="requestUri">The request URL.</param>
/// <returns>The buffered range reader stream.</returns>
public async Task <Stream> GetStreamAsync(Uri requestUri)
{
// Determine if the exists endpoint's length and whether it supports range requests.
using (var request = new HttpRequestMessage(HttpMethod.Head, requestUri))
using (var response = await _httpClient.SendAsync(request))
{
if (!response.IsSuccessStatusCode)
{
throw new MiniZipException(string.Format(
Strings.UnsuccessfulHttpStatusCodeWhenGettingLength,
(int)response.StatusCode,
response.ReasonPhrase));
}
if (response.Content?.Headers?.ContentLength == null)
{
throw new MiniZipException(Strings.ContentLengthHeaderNotFound);
}
if (response.Headers.AcceptRanges == null ||
!response.Headers.AcceptRanges.Contains(HttpConstants.BytesUnit))
{
throw new MiniZipException(string.Format(
Strings.AcceptRangesBytesValueNotFoundFormat,
HttpConstants.BytesUnit));
}
var length = response.Content.Headers.ContentLength.Value;
var etagBehavior = ETagBehavior;
var etag = response.Headers?.ETag;
if (etag != null && (etag.IsWeak || etagBehavior == ETagBehavior.Ignore))
{
etag = null;
}
if (etag == null && etagBehavior == ETagBehavior.Required)
{
throw new MiniZipException(string.Format(
Strings.MissingETagHeader,
nameof(MiniZip.ETagBehavior),
nameof(ETagBehavior.Required)));
}
var httpRangeReader = new HttpRangeReader(_httpClient, requestUri, length, etag);
var bufferSizeProvider = new ZipBufferSizeProvider(FirstBufferSize, SecondBufferSize, BufferGrowthExponent);
var stream = new BufferedRangeStream(httpRangeReader, length, bufferSizeProvider);
return(stream);
}
}
public void GivesExpectedSequence()
{
// Arrange
var target = new ZipBufferSizeProvider(100, 5000, 25);
// Act
var values = Enumerable
.Range(0, 8)
.Select(x => target.GetNextBufferSize())
.ToList();
// Assert
Assert.Equal(
new[] { 100, 5000, 125000, 3125000, 78125000, 1953125000, int.MaxValue, int.MaxValue },
values);
}
public async Task WithSelfUsingFileRangeReader(string path)
{
// Arrange
using (var memoryStream = TestUtility.BufferTestData(path))
{
var fullPath = Path.Combine(TestUtility.TestDataDirectory, path);
var length = new FileInfo(fullPath).Length;
var fileRangeReader = new FileRangeReader(fullPath);
var bufferSizeProvider = new ZipBufferSizeProvider(firstBufferSize: 1, secondBufferSize: 1, exponent: 2);
using (var bufferedRangeStream = new BufferedRangeStream(fileRangeReader, length, bufferSizeProvider))
{
// Act
var a = await TestUtility.ReadWithMiniZipAsync(memoryStream);
var b = await TestUtility.ReadWithMiniZipAsync(bufferedRangeStream);
// Assert
TestUtility.VerifyJsonEquals(a.Data, b.Data);
Assert.Equal(a.Success, b.Success);
Assert.Equal(a.Exception?.Message, b.Exception?.Message);
Assert.Equal(a.Exception?.GetType(), b.Exception?.GetType());
}
}
}
