//[Fact(Skip = "Disabled IIS Express tests because they fail to initialize")]
public async Task ABlockedReceivedCallbackWillTriggerAnError()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
host.Initialize();
using (var connection = CreateConnection(host, "/echo"))
{
var wh = new ManualResetEventSlim();
Exception ex = null;
connection.DeadlockErrorTimeout = TimeSpan.FromSeconds(1);
connection.Received += _ => wh.Wait(TimeSpan.FromSeconds(5));
connection.Error += error =>
{
ex = error;
wh.Set();
};
await connection.Start();
// Ensure the received callback is actually called
await connection.Send("");
Assert.True(wh.Wait(TimeSpan.FromSeconds(10)));
Assert.IsType <SlowCallbackException>(ex);
}
}
}
protected HubConnection CreateAuthHubConnection(ITestHost host, string user, string password)
{
var path = "/cookieauth/signalr";
var useDefaultUrl = false;
var query = new Dictionary <string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var handler = new HttpClientHandler();
handler.CookieContainer = new CookieContainer();
using (var httpClient = new HttpClient(handler))
{
var content = string.Format("UserName={0}&Password={1}", user, password);
var response = httpClient.PostAsync(host.Url + "/cookieauth/Account/Login", new StringContent(content, Encoding.UTF8, "application/x-www-form-urlencoded")).Result;
}
var connection = new HubConnection(host.Url + path, query, useDefaultUrl);
connection.TransportConnectTimeout = TimeSpan.FromSeconds(10); // Adds 10 seconds to the server's connect timeout (5 seconds) for a total of 15 seconds.
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
connection.CookieContainer = handler.CookieContainer;
return(connection);
}
public async Task TestLocalRcpEndpointRuntimeVersion(string runtimeVersion, bool enabledExpected)
{
INameResolver nameResolver = new SimpleNameResolver(
new Dictionary <string, string>
{
{ "FUNCTIONS_WORKER_RUNTIME", runtimeVersion },
});
using (ITestHost host = TestHelpers.GetJobHost(
this.loggerProvider,
nameof(this.TestLocalRcpEndpointRuntimeVersion),
enableExtendedSessions: false,
localRpcEndpointEnabled: null /* use FUNCTIONS_WORKER_RUNTIME to decide */,
nameResolver: nameResolver))
{
await host.StartAsync();
// Check to see whether the local RPC endpoint has been opened
IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
IPEndPoint[] endpoints = ipGlobalProperties.GetActiveTcpListeners();
const string LocalRcpAddress = "127.0.0.1:17071";
if (enabledExpected)
{
Assert.Contains(LocalRcpAddress, endpoints.Select(ep => ep.ToString()));
}
else
{
Assert.DoesNotContain(LocalRcpAddress, endpoints.Select(ep => ep.ToString()));
}
await host.StopAsync();
}
}
public async Task TestLocalRcpEndpointRuntimeVersion(string runtimeVersion, bool enabledExpected)
{
INameResolver nameResolver = new SimpleNameResolver(
new Dictionary <string, string>
{
{ "FUNCTIONS_WORKER_RUNTIME", runtimeVersion },
});
using (ITestHost host = TestHelpers.GetJobHost(
this.loggerProvider,
nameof(this.TestLocalRcpEndpointRuntimeVersion),
enableExtendedSessions: false,
localRpcEndpointEnabled: null /* use FUNCTIONS_WORKER_RUNTIME to decide */,
nameResolver: nameResolver))
{
await host.StartAsync();
// Validate if we opened local RPC endpoint by looking at log statements.
var logger = this.loggerProvider.CreatedLoggers.Single(l => l.Category == TestHelpers.LogCategory);
var logMessages = logger.LogMessages.ToList();
bool enabledRpcEndpoint = logMessages.Any(msg => msg.Level == Microsoft.Extensions.Logging.LogLevel.Information && msg.FormattedMessage.StartsWith("Opened local RPC endpoint:"));
Assert.Equal(enabledExpected, enabledRpcEndpoint);
await host.StopAsync();
}
}
public static async Task <TestDurableClient> StartOrchestratorAsync(
this ITestHost host,
string functionName,
object input,
ITestOutputHelper output,
string instanceId = null,
bool useTaskHubFromAppSettings = false)
{
var startFunction = useTaskHubFromAppSettings ?
typeof(ClientFunctions).GetMethod(nameof(ClientFunctions.StartFunctionWithTaskHub)) :
typeof(ClientFunctions).GetMethod(nameof(ClientFunctions.StartFunction));
var clientRef = new TestDurableClient[1];
var args = new Dictionary <string, object>
{
{ "functionName", functionName },
{ "instanceId", instanceId },
{ "input", input },
{ "clientRef", clientRef },
};
await host.CallAsync(startFunction, args);
TestDurableClient client = clientRef[0];
output.WriteLine($"Started {functionName}, Instance ID = {client.InstanceId}");
return(client);
}
public CustomTestInstance(CustomTestHost host, TestPath path, TestInstance parent, Type hostType, bool useFixtureInstance)
: base(host, path, parent)
{
HostType = hostType;
UseFixtureInstance = useFixtureInstance;
customHost = host.Attribute as ITestHost <ITestInstance>;
}
//[Fact(Skip = "Disabled IIS Express tests because they fail to initialize")]
public async Task ABlockedReceivedCallbackWillTriggerAnError()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
host.Initialize();
using (var connection = CreateConnection(host, "/echo"))
{
var wh = new TaskCompletionSource <object>();
connection.DeadlockErrorTimeout = TimeSpan.FromSeconds(1);
connection.Error += error =>
{
wh.TrySetResult(error);
};
await connection.Start();
// Ensure the received callback is actually called
await connection.Send("");
Assert.IsType <SlowCallbackException>(await wh.Task.OrTimeout(TimeSpan.FromSeconds(10)));
}
}
}
protected void SetHostData(ITestHost host, Dictionary <string, string> query)
{
foreach (var item in host.ExtraData)
{
query[item.Key] = item.Value;
}
}
public async Task BindToBlobViaPOCO(string storageProviderType)
{
using (ITestHost host = TestHelpers.GetJobHost(this.loggerProvider, nameof(this.BindToBlobViaPOCO), false, storageProviderType))
{
await host.StartAsync();
string connectionString = TestHelpers.GetStorageConnectionString();
CloudStorageAccount account = CloudStorageAccount.Parse(connectionString);
this.output.WriteLine($"Using storage account: {account.Credentials.AccountName}");
// Blob and container names need to be kept in sync with the activity code.
var data = new
{
InputPrefix = "Input",
OutputPrefix = "Output",
Suffix = 42,
};
const string ContainerName = "test";
string inputBlobName = $"{data.InputPrefix}-{data.Suffix}";
string outputBlobName = $"{data.OutputPrefix}-{data.Suffix}";
CloudBlobClient blobClient = account.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference(ContainerName);
if (await container.CreateIfNotExistsAsync())
{
this.output.WriteLine($"Created container '{container.Name}'.");
}
string randomData = Guid.NewGuid().ToString("N");
this.output.WriteLine($"Creating blob named {outputBlobName}...");
CloudBlockBlob blob = container.GetBlockBlobReference(inputBlobName);
await blob.UploadTextAsync(randomData);
this.output.WriteLine($"Uploaded text '{randomData}' to {blob.Name}.");
// Using StartOrchestrationArgs to start an activity function because it's easier than creating a new type.
var startArgs = new StartOrchestrationArgs();
startArgs.FunctionName = nameof(TestActivities.BindToBlobViaJsonPayload);
startArgs.Input = data;
var client = await host.StartOrchestratorAsync(nameof(TestOrchestrations.CallActivity), startArgs, this.output);
var status = await client.WaitForCompletionAsync(this.output);
Assert.Equal(OrchestrationRuntimeStatus.Completed, status?.RuntimeStatus);
this.output.WriteLine($"Searching for blob named {outputBlobName}...");
CloudBlockBlob newBlob = container.GetBlockBlobReference(outputBlobName);
string copiedData = await newBlob.DownloadTextAsync();
this.output.WriteLine($"Downloaded text '{copiedData}' from {newBlob.Name}.");
Assert.Equal(randomData, copiedData);
await host.StopAsync();
}
}
public CustomTestHost(string name, Type type, Type hostType, TestFlags flags,
TestHostAttribute attr, ITestHost <ITestInstance> staticHost, bool useFixtureInstance)
: base(TestPathType.Parameter, name, name, type, hostType, flags)
{
HostType = hostType;
Attribute = attr;
StaticHost = staticHost;
UseFixtureInstance = useFixtureInstance;
}
protected Client.Connection CreateConnection(ITestHost host, string path)
{
var query = new Dictionary<string, string>();
query["test"] = GetTestName();
SetHostData(host, query);
var connection = new Client.Connection(host.Url + path, query);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return connection;
}
protected Client.Connection CreateConnection(ITestHost host, string path)
{
var query = new Dictionary <string, string>();
query["test"] = GetTestName();
SetHostData(host, query);
var connection = new Client.Connection(host.Url + path, query);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return(connection);
}
protected HubConnection CreateHubConnection(ITestHost host, string url = null, bool useDefaultUrl = true)
{
var query = new Dictionary <string, string>();
query["test"] = GetTestName();
SetHostData(host, query);
var connection = new HubConnection(url ?? host.Url, query, useDefaultUrl);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return(connection);
}
protected HubConnection CreateHubConnection(ITestHost host, string path = null, bool useDefaultUrl = true)
{
var query = new Dictionary <string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var connection = new HubConnection(host.Url + path, query, useDefaultUrl);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return(connection);
}
protected Client.Connection CreateConnection(ITestHost host, string path)
{
var query = new Dictionary <string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var connection = new Client.Connection(host.Url + path, query);
connection.TransportConnectTimeout = TimeSpan.FromSeconds(10); // Adds 10 seconds to the server's connect timeout (5 seconds) for a total of 15 seconds.
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return(connection);
}
//[Fact(Skip = "Disabled IIS Express tests because they fail to initialize")]
public void WebSocketsTransportFailsIfOnConnectedThrows()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
host.Initialize();
var connection = CreateConnection(host, "/fall-back-throws");
using (connection)
{
Assert.Throws <AggregateException>(() => connection.Start(new WebSocketTransport()).Wait());
}
}
}
public void ConnectionCanBeEstablishedWithPreSendRequestHeadersEventAttached()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
((IISExpressTestHost)host).AttachToPreSendRequestHeaders = true;
host.Initialize();
var connection = CreateConnection(host, "/async-on-connected");
using (connection)
{
Assert.True(connection.Start().Wait(TimeSpan.FromSeconds(10)), "The connection failed to start.");
}
}
}
public void SelectingDefaultStorageProviderWhenNoTypeIsProvided()
{
var orchestrationServiceClientMock = new Mock <IOrchestrationServiceClient>();
Mock <IDurabilityProviderFactory> azureStorageMock = GetAzureStorageStorageProviderMock(orchestrationServiceClientMock);
Mock <IDurabilityProviderFactory> microsoftSQLMock = GetMicrosoftSQLStorageProviderMock(orchestrationServiceClientMock);
Mock <IDurabilityProviderFactory> netheriteMock = GetNetheriteStorageProviderMock(orchestrationServiceClientMock);
IEnumerable <IDurabilityProviderFactory> durabilityProviderFactories = new[] { azureStorageMock.Object, microsoftSQLMock.Object, netheriteMock.Object };
using (ITestHost host = TestHelpers.GetJobHostWithMultipleDurabilityProviders(
durabilityProviderFactories: durabilityProviderFactories))
{
netheriteMock.Verify(n => n.GetDurabilityProvider(), Times.Never());
azureStorageMock.Verify(a => a.GetDurabilityProvider(), Times.Once());
microsoftSQLMock.Verify(m => m.GetDurabilityProvider(), Times.Never());
}
}
public void TransportConnectTimeoutDoesNotAddupOverNegotiateRequests()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
host.Initialize();
var connection = CreateConnection(host, "/signalr");
connection.TransportConnectTimeout = TimeSpan.FromSeconds(5);
using (connection)
{
connection.Start().Wait();
var totalTransportConnectTimeout = ((Client.IConnection)connection).TotalTransportConnectTimeout;
connection.Stop();
connection.Start().Wait();
Assert.Equal(((Client.IConnection)connection).TotalTransportConnectTimeout, totalTransportConnectTimeout);
}
}
}
/// <summary>
/// Helper function for the IDurableOrchestrationClientBinding test. Gets an IDurableOrchestrationClient.
/// </summary>
public static async Task <IDurableOrchestrationClient> GetOrchestrationClientBindingTest(
this ITestHost host,
ITestOutputHelper output)
{
var startFunction = typeof(ClientFunctions)
.GetMethod(nameof(ClientFunctions.GetOrchestrationClientBindingTest));
var clientRef = new IDurableOrchestrationClient[1];
var args = new Dictionary <string, object>
{
{ "clientRef", clientRef },
};
await host.CallAsync(startFunction, args);
IDurableOrchestrationClient client = clientRef[0];
return(client);
}
public async Task TimerLengthLessThanMaxTime(bool extendedSessions)
{
using (ITestHost host = TestHelpers.GetJobHost(
this.loggerProvider,
nameof(this.TimerLengthLessThanMaxTime),
extendedSessions,
storageProviderType: "azure_storage",
durabilityProviderFactoryType: typeof(AzureStorageShortenedTimerDurabilityProviderFactory)))
{
await host.StartAsync();
var fireAt = DateTime.UtcNow.AddSeconds(30);
var client = await host.StartOrchestratorAsync(nameof(TestOrchestrations.Timer), fireAt, this.output);
var status = await client.WaitForCompletionAsync(this.output, timeout : TimeSpan.FromMinutes(2));
Assert.Equal(OrchestrationRuntimeStatus.Completed, status.RuntimeStatus);
await host.StopAsync();
}
}
public override async Task Initialize(TestContext ctx, CancellationToken cancellationToken)
{
if (customHost == null)
{
if (UseFixtureInstance)
{
customHost = (ITestHost <ITestInstance>)GetFixtureInstance().Instance;
}
else if (HostType != null)
{
customHost = (ITestHost <ITestInstance>)Activator.CreateInstance(HostType);
}
else
{
throw new InternalErrorException();
}
}
instance = customHost.CreateInstance(ctx);
await instance.Initialize(ctx, cancellationToken);
}
public static async Task <TestEntityClient> GetEntityClientAsync(
this ITestHost host,
EntityId entityId,
ITestOutputHelper output)
{
var startFunction = typeof(ClientFunctions)
.GetMethod(nameof(ClientFunctions.GetEntityClient));
var clientRef = new TestEntityClient[1];
var args = new Dictionary <string, object>
{
{ "entityId", entityId },
{ "clientRef", clientRef },
};
await host.CallAsync(startFunction, args);
TestEntityClient client = clientRef[0];
return(client);
}
public async Task WaitForExternalEventAboveMaximumTimerLength()
{
using (ITestHost host = TestHelpers.GetJobHost(
this.loggerProvider,
nameof(this.WaitForExternalEventAboveMaximumTimerLength),
enableExtendedSessions: false,
storageProviderType: "azure_storage",
durabilityProviderFactoryType: typeof(AzureStorageShortenedTimerDurabilityProviderFactory)))
{
await host.StartAsync();
var fireAt = TimeSpan.FromSeconds(90);
var client = await host.StartOrchestratorAsync(nameof(TestOrchestrations.ApprovalWithTimeout), (fireAt, "throw"), this.output);
var status = await client.WaitForCompletionAsync(this.output, timeout : TimeSpan.FromMinutes(2));
Assert.Equal(OrchestrationRuntimeStatus.Completed, status?.RuntimeStatus);
Assert.Equal("TimeoutException", status?.Output);
await host.StopAsync();
}
}
public async Task InvokeLocalRpcEndpoint()
{
using (ITestHost host = TestHelpers.GetJobHost(
this.loggerProvider,
nameof(this.InvokeLocalRpcEndpoint),
enableExtendedSessions: false,
localRpcEndpointEnabled: true,
notificationUrl: null))
{
await host.StartAsync();
using (var client = new WebClient())
{
string jsonString = client.DownloadString("http://localhost:17071/durabletask/instances");
// The result is expected to be an empty array
JArray array = JArray.Parse(jsonString);
}
await host.StopAsync();
}
}
public void StorageProviderTypeSpecified_CorrectStorageProviderFactoryUsed(string storageProvider)
{
var orchestrationServiceClientMock = new Mock <IOrchestrationServiceClient>();
Mock <IDurabilityProviderFactory> azureStorageMock = GetAzureStorageStorageProviderMock(orchestrationServiceClientMock);
Mock <IDurabilityProviderFactory> microsoftSQLMock = GetMicrosoftSQLStorageProviderMock(orchestrationServiceClientMock);
Mock <IDurabilityProviderFactory> netheriteMock = GetNetheriteStorageProviderMock(orchestrationServiceClientMock);
IEnumerable <IDurabilityProviderFactory> durabilityProviderFactories = new[] { azureStorageMock.Object, microsoftSQLMock.Object, netheriteMock.Object };
DurableTaskOptions options = new DurableTaskOptions();
options.StorageProvider["type"] = storageProvider;
using (ITestHost host = TestHelpers.GetJobHostWithMultipleDurabilityProviders(
options: options,
durabilityProviderFactories: durabilityProviderFactories))
{
azureStorageMock.Verify(a => a.GetDurabilityProvider(), string.Equals(storageProvider, "AzureStorage") ? Times.Once() : Times.Never());
microsoftSQLMock.Verify(m => m.GetDurabilityProvider(), string.Equals(storageProvider, "MicrosoftSQL") ? Times.Once() : Times.Never());
netheriteMock.Verify(n => n.GetDurabilityProvider(), string.Equals(storageProvider, "Netherite") ? Times.Once() : Times.Never());
}
}
public async Task ActivityTriggerAsNumber(string storageProviderType)
{
using (ITestHost host = TestHelpers.GetJobHost(this.loggerProvider, nameof(this.ActivityTriggerAsNumber), false, storageProviderType))
{
await host.StartAsync();
// Using StartOrchestrationArgs to start an activity function because it's easier than creating a new type.
var startArgs = new StartOrchestrationArgs();
startArgs.FunctionName = nameof(TestActivities.BindToDouble);
startArgs.Input = 3.14;
var client = await host.StartOrchestratorAsync(nameof(TestOrchestrations.CallActivity), startArgs, this.output);
var status = await client.WaitForCompletionAsync(this.output);
// The function echos back the input value
Assert.Equal(OrchestrationRuntimeStatus.Completed, status?.RuntimeStatus);
Assert.Equal((double)startArgs.Input, status?.Output);
await host.StopAsync();
}
}
protected Client.Connection CreateAuthConnection(ITestHost host, string path, string user, string password)
{
var query = new Dictionary <string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var handler = new HttpClientHandler();
handler.CookieContainer = new CookieContainer();
using (var httpClient = new HttpClient(handler))
{
var content = string.Format("UserName={0}&Password={1}", user, password);
var response = httpClient.PostAsync(host.Url + "/cookieauth/Account/Login", new StringContent(content, Encoding.UTF8, "application/x-www-form-urlencoded")).Result;
}
var connection = new Client.Connection(host.Url + "/cookieauth" + path, query);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
connection.CookieContainer = handler.CookieContainer;
return(connection);
}
protected ITestHost CreateHost(HostType hostType, TransportType transportType)
{
ITestHost host = null;
switch (hostType)
{
case HostType.IISExpress:
host = new IISExpressTestHost();
host.Transport = CreateTransport(transportType);
break;
case HostType.Memory:
var mh = new MemoryHost();
host = new MemoryTestHost(mh);
host.Transport = CreateTransport(transportType, mh);
break;
default:
break;
}
return(host);
}
private async Task ActivityTriggerAsJObject(string storageProviderType)
{
using (ITestHost host = TestHelpers.GetJobHost(this.loggerProvider, nameof(this.ActivityTriggerAsJObject), false, storageProviderType))
{
await host.StartAsync();
// Using StartOrchestrationArgs to start an activity function because it's easier than creating a new type.
var startArgs = new StartOrchestrationArgs();
startArgs.FunctionName = nameof(TestActivities.BindToJObject);
startArgs.Input = new { Foo = "Bar" };
var client = await host.StartOrchestratorAsync(nameof(TestOrchestrations.CallActivity), startArgs, this.output);
var status = await client.WaitForCompletionAsync(this.output);
// The function checks to see if there is a property called "Foo" which is set to a value
// called "Bar" and returns true if this is the case. Otherwise returns false.
Assert.Equal(OrchestrationRuntimeStatus.Completed, status?.RuntimeStatus);
Assert.True((bool)status?.Output);
await host.StopAsync();
}
}
public void FallbackToLongPollingIIS()
{
using (ITestHost host = CreateHost(HostType.IISExpress))
{
// Reduce transportConnectionTimeout to 5 seconds
host.Initialize(transportConnectTimeout: 5);
var connection = CreateConnection(host, "/fall-back");
using (connection)
{
var tcs = new TaskCompletionSource <object>();
connection.StateChanged += change =>
{
if (change.NewState == ConnectionState.Reconnecting)
{
tcs.TrySetException(new Exception("The connection should not be reconnecting"));
}
};
var client = new DefaultHttpClient();
var transports = new IClientTransport[] {
new ServerSentEventsTransport(client),
new LongPollingTransport(client)
};
var transport = new AutoTransport(client, transports);
connection.Start(transport).Wait();
Assert.Equal(connection.Transport.Name, "longPolling");
Assert.False(tcs.Task.Wait(TimeSpan.FromSeconds(5)));
}
}
}
protected HubConnection CreateHubConnection(ITestHost host)
{
var query = new Dictionary<string, string>();
query["test"] = GetTestName();
return new HubConnection(host.Url, query);
}
protected void SetHostData(ITestHost host, Dictionary<string, string> query)
{
foreach (var item in host.ExtraData)
{
query[item.Key] = item.Value;
}
}
protected Client.Connection CreateAuthConnection(ITestHost host, string path, string user, string password)
{
var query = new Dictionary<string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var handler = new HttpClientHandler();
handler.CookieContainer = new CookieContainer();
using (var httpClient = new HttpClient(handler))
{
var content = string.Format("UserName={0}&Password={1}", user, password);
var response = httpClient.PostAsync(host.Url + "/cookieauth/Account/Login", new StringContent(content, Encoding.UTF8, "application/x-www-form-urlencoded")).Result;
}
var connection = new Client.Connection(host.Url + "/cookieauth" + path, query);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
connection.CookieContainer = handler.CookieContainer;
return connection;
}
protected HubConnection CreateHubConnection(ITestHost host, string path = null, bool useDefaultUrl = true)
{
var query = new Dictionary<string, string>();
query["test"] = GetTestName() + "." + Interlocked.Increment(ref _id);
SetHostData(host, query);
var connection = new HubConnection(host.Url + path, query, useDefaultUrl);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return connection;
}
protected HubConnection CreateHubConnection(ITestHost host, string url = null, bool useDefaultUrl = true)
{
var query = new Dictionary<string, string>();
query["test"] = GetTestName();
SetHostData(host, query);
var connection = new HubConnection(url ?? host.Url, query, useDefaultUrl);
connection.TraceWriter = host.ClientTraceOutput ?? connection.TraceWriter;
return connection;
}