public async Task Tries_to_access_cache_on_failure_but_returns_error_if_not_in_cache(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler(HttpStatusCode.InternalServerError);
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
var cacheTime = TimeSpan.FromSeconds(123);
cache.Setup(c => c.GetAsync(method + url)).ReturnsAsync(default(byte[]));
var client = new HttpClient(new RedisCacheFallbackHandler(testMessageHandler, TimeSpan.FromDays(1), cacheTime, cache.Object));
// execute
var result = await client.SendAsync(new HttpRequestMessage(method, url));
// validate
result.StatusCode.Should().Be(HttpStatusCode.InternalServerError);
}
public async Task Only_caches_get_results()
{
// setup
var testMessageHandler = new TestMessageHandler();
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), (IDistributedCache) null));
// execute twice for different methods
await client.PostAsync("http://unittest", new StringContent(string.Empty));
await client.PostAsync("http://unittest", new StringContent(string.Empty));
await client.PutAsync("http://unittest", new StringContent(string.Empty));
await client.PutAsync("http://unittest", new StringContent(string.Empty));
await client.DeleteAsync("http://unittest");
await client.DeleteAsync("http://unittest");
// validate
testMessageHandler.NumberOfCalls.Should().Be(6);
}
public async Task Caches_per_url()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock<IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(It.IsAny<string>())).ReturnsAsync(null);
cache.Setup(c => c.SetAsync(It.IsAny<string>(), It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), cache.Object));
// execute for different URLs
await client.GetAsync("http://unittest1");
await client.GetAsync("http://unittest2");
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
cache.Verify(c => c.SetAsync(It.IsAny<string>(), It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>()), Times.Exactly(2));
}
public async Task Gets_the_data_again_after_entry_is_gone_from_cache()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock<IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync("http://unittest/")).ReturnsAsync(null);
cache.Setup(c => c.SetAsync("http://unittest/", It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
await client.GetAsync("http://unittest");
await client.GetAsync("http://unittest");
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
cache.Verify(c => c.GetAsync("http://unittest/"), Times.Exactly(2));
}
public async Task Never_updates_the_cache_on_failure(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler(HttpStatusCode.InternalServerError);
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
var cacheTime = TimeSpan.FromSeconds(123);
cache.Setup(c => c.SetAsync(It.IsAny <string>(), It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
cache.Setup(c => c.GetAsync(method + url)).ReturnsAsync(default(byte[]));
var client = new HttpClient(new RedisCacheFallbackHandler(testMessageHandler, TimeSpan.FromDays(1), cacheTime, cache.Object));
// execute
await client.SendAsync(new HttpRequestMessage(method, url));
// validate
cache.Verify(c => c.SetAsync(It.IsAny <string>(), It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>()), Times.Never);
}
public async Task Always_calls_the_http_handler(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.SetAsync(RedisCacheFallbackHandler.CacheFallbackKeyPrefix + method + url, It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheFallbackHandler(testMessageHandler, TimeSpan.FromDays(1), TimeSpan.FromDays(1), cache.Object));
// execute twice
await client.SendAsync(new HttpRequestMessage(method, url));
cache.Verify(c => c.SetAsync(RedisCacheFallbackHandler.CacheFallbackKeyPrefix + method + url, It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>()), Times.Once); // ensure it's cached before the 2nd call
await client.SendAsync(new HttpRequestMessage(method, url));
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
}
public void Ignores_set_cache_exceptions()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock<IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync("http://unittest/")).ReturnsAsync(null);
cache.Setup(c => c.SetAsync("http://unittest/", It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>())).Throws<Exception>();
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
Func<Task<HttpResponseMessage>> func = async () => await client.GetAsync("http://unittest");
func.ShouldNotThrow();
// validate
testMessageHandler.NumberOfCalls.Should().Be(1);
cache.Verify(c => c.GetAsync("http://unittest/"), Times.Once);
cache.Verify(c => c.SetAsync("http://unittest/", It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>()), Times.Once);
}
public async Task Always_updates_the_cache_on_success(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
var cacheTime = TimeSpan.FromSeconds(123);
cache.Setup(c => c.SetAsync(method + url, It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheFallbackHandler(testMessageHandler, TimeSpan.FromDays(1), cacheTime, cache.Object));
// execute twice, validate cache is called each time
await client.SendAsync(new HttpRequestMessage(method, url));
cache.Verify(c => c.SetAsync(RedisCacheFallbackHandler.CacheFallbackKeyPrefix + method + url, It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>()), Times.Once);
await client.SendAsync(new HttpRequestMessage(method, url));
cache.Verify(c => c.SetAsync(RedisCacheFallbackHandler.CacheFallbackKeyPrefix + method + url, It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>()), Times.Exactly(2));
}
public async Task Caches_per_url_and_method(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(It.IsAny <string>(), It.IsAny <CancellationToken>())).ReturnsAsync(default(byte[]));
cache.Setup(c => c.SetAsync(It.IsAny <string>(), It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), cache.Object));
// execute for different URLs
await client.SendAsync(new HttpRequestMessage(method, "http://unittest1"));
await client.SendAsync(new HttpRequestMessage(method, "http://unittest2"));
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
cache.Verify(c => c.SetAsync(It.IsAny <string>(), It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>()), Times.Exactly(2));
}
public async Task Gets_the_data_again_after_entry_is_gone_from_cache(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync("http://unittest/", It.IsAny <CancellationToken>())).ReturnsAsync(default(byte[]));
cache.Setup(c => c.SetAsync("http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>())).Returns(Task.CompletedTask);
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
await client.SendAsync(new HttpRequestMessage(method, "http://unittest"));
await client.SendAsync(new HttpRequestMessage(method, "http://unittest"));
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
cache.Verify(c => c.GetAsync(method + "http://unittest/", It.IsAny <CancellationToken>()), Times.Exactly(2));
}
public async Task Caches_the_result()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock<IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync("http://unittest/")).ReturnsAsync(null);
cache.Setup(c => c.SetAsync("http://unittest/", It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
await client.GetAsync("http://unittest");
cache.Setup(c => c.GetAsync("http://unittest/")).ReturnsAsync(new SerializableCacheData(new byte[0], new HttpResponseMessage(HttpStatusCode.OK)).Serialize());
await client.GetAsync("http://unittest");
// validate
testMessageHandler.NumberOfCalls.Should().Be(1);
cache.Verify(c => c.GetAsync("http://unittest/"), Times.Exactly(2));
cache.Verify(c => c.SetAsync("http://unittest/", It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>()), Times.Once);
}
public void Gets_the_underlying_data_on_get_error()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(HttpMethod.Get + "http://unittest/")).ThrowsAsync(new Exception("unittest"));
cache.Setup(c => c.SetAsync(HttpMethod.Get + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), cache.Object));
// execute
Func <Task <HttpResponseMessage> > func = async() => await client.GetAsync("http://unittest");
func.ShouldNotThrow();
// validate
testMessageHandler.NumberOfCalls.Should().Be(1);
cache.Verify(c => c.GetAsync(HttpMethod.Get + "http://unittest/"), Times.Once);
cache.Verify(c => c.SetAsync(HttpMethod.Get + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>()), Times.Once);
}
public void Ignores_set_cache_exceptions()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(HttpMethod.Get + "http://unittest/", default(CancellationToken))).ReturnsAsync(default(byte[]));
cache.Setup(c => c.SetAsync(HttpMethod.Get + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>())).Throws <Exception>();
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
Func <Task <HttpResponseMessage> > func = async() => await client.GetAsync("http://unittest");
func.ShouldNotThrow();
// validate
testMessageHandler.NumberOfCalls.Should().Be(1);
cache.Verify(c => c.GetAsync(HttpMethod.Get + "http://unittest/", It.IsAny <CancellationToken>()), Times.Once);
cache.Verify(c => c.SetAsync(HttpMethod.Get + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>()), Times.Once);
}
public async Task Caches_the_result(HttpMethod method)
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(method + "http://unittest/", It.IsAny <CancellationToken>())).ReturnsAsync(default(byte[]));
cache.Setup(c => c.SetAsync(method + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>())).Returns(Task.CompletedTask);
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice
await client.SendAsync(new HttpRequestMessage(method, "http://unittest"));
cache.Setup(c => c.GetAsync(method + "http://unittest/", It.IsAny <CancellationToken>())).ReturnsAsync(() => new CacheData(new byte[0], new HttpResponseMessage(HttpStatusCode.OK), null, null).Serialize());
await client.SendAsync(new HttpRequestMessage(method, "http://unittest"));
// validate
testMessageHandler.NumberOfCalls.Should().Be(1);
cache.Verify(c => c.GetAsync(method + "http://unittest/", It.IsAny <CancellationToken>()), Times.Exactly(2));
cache.Verify(c => c.SetAsync(method + "http://unittest/", It.IsAny <byte[]>(), It.IsAny <DistributedCacheEntryOptions>(), It.IsAny <CancellationToken>()), Times.Once);
}
public async Task Only_caches_get_and_head_results()
{
// setup
var testMessageHandler = new TestMessageHandler();
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary <HttpStatusCode, TimeSpan>(), (IDistributedCache)null));
// execute twice for different methods
await client.PostAsync("http://unittest", new StringContent(string.Empty));
await client.PostAsync("http://unittest", new StringContent(string.Empty));
await client.PutAsync("http://unittest", new StringContent(string.Empty));
await client.PutAsync("http://unittest", new StringContent(string.Empty));
await client.DeleteAsync("http://unittest");
await client.DeleteAsync("http://unittest");
// validate
testMessageHandler.NumberOfCalls.Should().Be(6);
}
public void Invalidates_cache_per_method()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock <IDistributedCache>(MockBehavior.Strict);
var url = "http://unittest/";
var getKey = HttpMethod.Get + url;
var headKey = HttpMethod.Head + url;
cache.Setup(c => c.RemoveAsync(headKey, default(CancellationToken))).Returns(Task.FromResult(true));
cache.Setup(c => c.RemoveAsync(getKey, default(CancellationToken))).Throws <Exception>();
var cacheExpirationPerStatusCode = new Dictionary <HttpStatusCode, TimeSpan> {
{ (HttpStatusCode)200, TimeSpan.FromHours(1) }
};
var handler = new RedisCacheHandler(testMessageHandler, cacheExpirationPerStatusCode, cache.Object);
// execute
Func <Task> func = async() => await handler.InvalidateCache(new Uri(url), HttpMethod.Head);
// validate
func.ShouldNotThrow();
cache.Verify(c => c.RemoveAsync(headKey, default(CancellationToken)), Times.Once);
}
public async Task Data_from_call_matches_data_from_cache()
{
// setup
var testMessageHandler = new TestMessageHandler();
var cache = new Mock<IDistributedCache>(MockBehavior.Strict);
cache.Setup(c => c.GetAsync(It.IsAny<string>())).ReturnsAsync(new SerializableCacheData(Encoding.UTF8.GetBytes(TestMessageHandler.DefaultContent), new HttpResponseMessage(HttpStatusCode.OK)).Serialize());
cache.Setup(c => c.SetAsync(It.IsAny<string>(), It.IsAny<byte[]>(), It.IsAny<DistributedCacheEntryOptions>())).Returns(Task.FromResult(true));
var client = new HttpClient(new RedisCacheHandler(testMessageHandler, new Dictionary<HttpStatusCode, TimeSpan>(), cache.Object));
// execute twice for different methods
var originalResult = await client.GetAsync("http://unittest");
var cachedResult = await client.GetAsync("http://unittest");
var originalResultString = await originalResult.Content.ReadAsStringAsync();
var cachedResultString = await cachedResult.Content.ReadAsStringAsync();
// validate
originalResultString.ShouldBeEquivalentTo(cachedResultString);
originalResultString.ShouldBeEquivalentTo(TestMessageHandler.DefaultContent);
}