public async Task PullAsync_Cancels_WhenCancellationTokenIsCancelled()
{
var store = new MobileServiceLocalStoreMock();
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = op => Task.Delay(TimeSpan.MaxValue).ContinueWith<JObject>(t => null); // long slow operation
var hijack = new TestHttpHandler();
hijack.OnSendingRequest = async req =>
{
await Task.Delay(1000);
return req;
};
IMobileServiceClient service = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp, hijack);
await service.SyncContext.InitializeAsync(store, handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
using (var cts = new CancellationTokenSource())
{
Task pullTask = table.PullAsync(null, null, null, cancellationToken: cts.Token);
cts.Cancel();
var ex = await ThrowsAsync<Exception>(() => pullTask);
Assert.IsTrue((ex is OperationCanceledException || ex is TaskCanceledException));
Assert.AreEqual(pullTask.Status, TaskStatus.Canceled);
}
}
public async Task PullAsync_Cancels_WhenCancellationTokenIsCancelled()
{
var store = new MobileServiceLocalStoreMock();
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = op => Task.Delay(TimeSpan.MaxValue).ContinueWith<JObject>(t => null); // long slow operation
IMobileServiceClient service = new MobileServiceClient("http://www.test.com", "secret...");
await service.SyncContext.InitializeAsync(store, handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
using (var cts = new CancellationTokenSource())
{
// now pull
Task pullTask = table.PullAsync(null, null, null, cancellationToken: cts.Token);
cts.Cancel();
var ex = await ThrowsAsync<Exception>(() => pullTask);
Assert.IsTrue((ex is OperationCanceledException || ex is TaskCanceledException));
Assert.AreEqual(pullTask.Status, TaskStatus.Canceled);
}
}
public async Task PushAsync_Succeeds_WithPendingOperations_AndOpQueueIsConsistent()
{
// Essentially async ManualResetEvents
SemaphoreSlim untilPendingOpsCreated = new SemaphoreSlim(0, 1);
SemaphoreSlim untilAboutToExecuteOp = new SemaphoreSlim(0, 1);
int pushState = 0;
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = async op =>
{
try
{
untilAboutToExecuteOp.Release();
await untilPendingOpsCreated.WaitAsync();
JObject result = await op.ExecuteAsync();
if (0 == pushState)
{
Assert.AreEqual(MobileServiceTableOperationKind.Insert, op.Kind);
Assert.AreEqual(0, op.Item.Value<int>("value"));
}
else
{
Assert.AreEqual(MobileServiceTableOperationKind.Update, op.Kind);
Assert.AreEqual(2, op.Item.Value<int>("value")); // We shouldn't see the value == 1, since it should have been collapsed
}
// We don't care what the server actually returned, as long as there was no exception raised in our Push logic
return result;
}
catch (Exception ex)
{
Assert.Fail("Things are bad: " + ex.Message);
}
return null;
};
var hijack = new TestHttpHandler();
IMobileServiceClient service = new MobileServiceClient("http://www.test.com", hijack);
LocalStoreWithDelay mockLocalStore = new LocalStoreWithDelay();
await service.SyncContext.InitializeAsync(mockLocalStore, handler);
JObject item = null;
// Add the initial operation and perform a push
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
string responseContent = @"{ ""id"": ""abc"", ""value"": ""0"", ""version"": ""v0"" }"; // Whatever is fine, since we won't use it or look at it
// Do this Insert/Push/Update+Update/Push cycle several times fast to try to hit any race conditions that would cause an error
for (int id = 0; id < 10; id++)
{
hijack.SetResponseContent(responseContent);
string idStr = "id" + id; // Generate a new Id each time in case the mock objects ever care that we insert an item that already exists
// The Operations and PushAction don't necessarily clone the JObject, so we need a fresh one for each operation or else we'll change
// the in-memory representation of the JObject stored in all operations, as well as in the "batch" the PushAction owns. This is problematic.
item = new JObject() { { "id", idStr }, { "value", 0 } };
await table.InsertAsync(item);
Task pushComplete = service.SyncContext.PushAsync();
// Make sure the PushAction has actually called into our SyncHandler, otherwise the two UpdateOperations could collapse onto it, and
// there won't necessarily even be a second PushAction
await untilAboutToExecuteOp.WaitAsync();
// Add some more operations while that push is in flight. Since these operations affect the same item in someTable, the operations
// will be stuck awaiting the PushAction since it locks on the row.
item = new JObject() { { "id", idStr }, { "value", 1 } };
Task updateOnce = table.UpdateAsync(item);
item = new JObject() { { "id", idStr }, { "value", 2 } };
Task updateTwice = table.UpdateAsync(item);
// Before we let the push finish, let's inject a delay that will cause it to take a long time deleting the operation from the queue.
// This will give the other operations, if there's an unaddressed race condition, a chance to wreak havoc on the op queue.
mockLocalStore.SetLookupDelay(500);
// Let the first push finish
untilPendingOpsCreated.Release();
await pushComplete;
mockLocalStore.SetLookupDelay(0);
await updateOnce;
await updateTwice;
// Push again, but now the operation condensed from the two updates should be executed remotely
pushState = (pushState + 1) % 2;
hijack.SetResponseContent(responseContent);
pushComplete = service.SyncContext.PushAsync();
await untilAboutToExecuteOp.WaitAsync(); // not strictly necessary other than to keep the semaphore count at 0
untilPendingOpsCreated.Release();
await pushComplete;
pushState = (pushState + 1) % 2;
}
}
public async Task PushAsync_Succeeds_WithClientWinsPolicy()
{
var hijack = new TestHttpHandler();
hijack.Responses.Add(new HttpResponseMessage(HttpStatusCode.PreconditionFailed)
{
Content = new StringContent("{\"id\":\"abc\",\"version\":\"Hey\"}")
});
hijack.AddResponseContent(@"{""id"": ""abc""}");
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = async op =>
{
for (int i = 0; i < 2; i++)
{
try
{
return await op.ExecuteAsync();
}
catch (MobileServicePreconditionFailedException ex)
{
op.Item[MobileServiceSystemColumns.Version] = ex.Value[MobileServiceSystemColumns.Version];
}
}
return null;
};
IMobileServiceClient service = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp, hijack);
await service.SyncContext.InitializeAsync(new MobileServiceLocalStoreMock(), handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
await table.UpdateAsync(new JObject() { { "id", "abc" }, { "version", "Wow" } });
await service.SyncContext.PushAsync();
}
public async Task UpdateOperationAsync_UpsertsTheItemInLocalStore_AndDeletesTheError_FromSyncHandler()
{
// Arrange
string itemId = "abc";
var hijack = new TestHttpHandler();
hijack.Responses.Add(new HttpResponseMessage(HttpStatusCode.InternalServerError));
var handler = new MobileServiceSyncHandlerMock();
handler.PushCompleteAction = async pushCompletionResult =>
{
foreach (var error in pushCompletionResult.Errors)
{
await error.UpdateOperationAsync(JObject.Parse("{\"id\":\"abc\",\"__version\":\"Hey\"}"));
}
};
var store = new MobileServiceLocalStoreMock();
IMobileServiceClient service = new MobileServiceClient("http://www.test.com", hijack);
await service.SyncContext.InitializeAsync(store, handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
await table.InsertAsync(new JObject() { { "id", "abc" }, { "__version", "Wow" } });
// Act
await (service.SyncContext as MobileServiceSyncContext).PushAsync(CancellationToken.None, MobileServiceTableKind.Table);
// Assert
var syncError = store.TableMap[MobileServiceLocalSystemTables.SyncErrors].Values;
var operation = store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Values.FirstOrDefault();
var item = JObject.Parse("{\"id\":\"abc\",\"__version\":\"Hey\"}");
JObject upserted = await store.LookupAsync("someTable", itemId);
// item is upserted
Assert.IsNotNull(upserted);
// verify if the record was updated
Assert.AreEqual(item.ToString(), upserted.ToString());
// verify if the errors were cleared
Assert.AreEqual(0, syncError.Count);
// Verify operation is still present
Assert.AreEqual(operation.Value<string>("itemId"),itemId);
}
public async Task PushAsync_InvokesHandler_WhenTableTypeIsTable()
{
var hijack = new TestHttpHandler();
hijack.Responses.Add(new HttpResponseMessage(HttpStatusCode.InternalServerError));
bool invoked = false;
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = op =>
{
invoked = true;
return Task.FromResult(JObject.Parse("{\"id\":\"abc\",\"version\":\"Hey\"}"));
};
IMobileServiceClient service = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp, hijack);
await service.SyncContext.InitializeAsync(new MobileServiceLocalStoreMock(), handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
await table.InsertAsync(new JObject() { { "id", "abc" }, { "version", "Wow" } });
await (service.SyncContext as MobileServiceSyncContext).PushAsync(CancellationToken.None, MobileServiceTableKind.Table);
Assert.IsTrue(invoked);
}
public async Task PushAsync_DoesNotRunHandler_WhenTableTypeIsNotTable()
{
var hijack = new TestHttpHandler();
hijack.AddResponseContent("{\"id\":\"abc\",\"version\":\"Hey\"}");
bool invoked = false;
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = op =>
{
invoked = true;
throw new InvalidOperationException();
};
IMobileServiceClient service = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp, hijack);
await service.SyncContext.InitializeAsync(new MobileServiceLocalStoreMock(), handler);
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
await table.InsertAsync(new JObject() { { "id", "abc" }, { "version", "Wow" } });
await (service.SyncContext as MobileServiceSyncContext).PushAsync(CancellationToken.None, (MobileServiceTableKind)1);
Assert.IsFalse(invoked);
}
/// <summary>
/// Tests that throwing an exception of type toThrow from the http handler causes the push sync to be aborted
/// </summary>
/// <param name="toThrow">The exception to simulate coming from http layer</param>
/// <param name="expectedStatus">The expected status of push operation as reported in PushCompletionResult and PushFailedException</param>
/// <returns></returns>
private async Task TestPushAbort(Exception toThrow, MobileServicePushStatus expectedStatus)
{
bool thrown = false;
var hijack = new TestHttpHandler();
hijack.OnSendingRequest = req =>
{
if (!thrown)
{
thrown = true;
throw toThrow;
}
return Task.FromResult(req);
};
var operationHandler = new MobileServiceSyncHandlerMock();
hijack.SetResponseContent("{\"id\":\"abc\",\"String\":\"Hey\"}");
IMobileServiceClient service = new MobileServiceClient("http://www.test.com", "secret...", hijack);
await service.SyncContext.InitializeAsync(new MobileServiceLocalStoreMock(), operationHandler);
IMobileServiceSyncTable<StringIdType> table = service.GetSyncTable<StringIdType>();
var item = new StringIdType() { Id = "an id", String = "what?" };
await table.InsertAsync(item);
Assert.AreEqual(service.SyncContext.PendingOperations, 1L);
MobileServicePushFailedException ex = await ThrowsAsync<MobileServicePushFailedException>(service.SyncContext.PushAsync);
Assert.AreEqual(ex.PushResult.Status, expectedStatus);
Assert.AreEqual(ex.PushResult.Errors.Count(), 0);
Assert.AreEqual(operationHandler.PushCompletionResult.Status, expectedStatus);
// the insert operation is still in queue
Assert.AreEqual(service.SyncContext.PendingOperations, 1L);
await service.SyncContext.PushAsync();
Assert.AreEqual(service.SyncContext.PendingOperations, 0L);
Assert.AreEqual(operationHandler.PushCompletionResult.Status, MobileServicePushStatus.Complete);
}
public async Task PushAsync_Succeeds_WithPendingOperations_AndOpQueueIsConsistent()
{
// Essentially async ManualResetEvents
SemaphoreSlim untilPendingOpsCreated = new SemaphoreSlim(0, 1);
SemaphoreSlim untilAboutToExecuteOp = new SemaphoreSlim(0, 1);
int pushState = 0;
var handler = new MobileServiceSyncHandlerMock();
handler.TableOperationAction = async op =>
{
try
{
untilAboutToExecuteOp.Release();
await untilPendingOpsCreated.WaitAsync();
JObject result = await op.ExecuteAsync();
if (0 == pushState)
{
Assert.AreEqual(MobileServiceTableOperationKind.Insert, op.Kind);
Assert.AreEqual(0, op.Item.Value <int>("value"));
}
else
{
Assert.AreEqual(MobileServiceTableOperationKind.Update, op.Kind);
Assert.AreEqual(2, op.Item.Value <int>("value")); // We shouldn't see the value == 1, since it should have been collapsed
}
// We don't care what the server actually returned, as long as there was no exception raised in our Push logic
return(result);
}
catch (Exception ex)
{
Assert.Fail("Things are bad: " + ex.Message);
}
return(null);
};
var hijack = new TestHttpHandler();
IMobileServiceClient service = new MobileServiceClient("http://www.test.com", "secret...", hijack);
LocalStoreWithDelay mockLocalStore = new LocalStoreWithDelay();
await service.SyncContext.InitializeAsync(mockLocalStore, handler);
JObject item = null;
// Add the initial operation and perform a push
IMobileServiceSyncTable table = service.GetSyncTable("someTable");
string responseContent = @"{ ""id"": ""abc"", ""value"": ""0"", ""__version"": ""v0"" }"; // Whatever is fine, since we won't use it or look at it
// Do this Insert/Push/Update+Update/Push cycle several times fast to try to hit any race conditions that would cause an error
for (int id = 0; id < 10; id++)
{
hijack.SetResponseContent(responseContent);
string idStr = "id" + id; // Generate a new Id each time in case the mock objects ever care that we insert an item that already exists
// The Operations and PushAction don't necessarily clone the JObject, so we need a fresh one for each operation or else we'll change
// the in-memory representation of the JObject stored in all operations, as well as in the "batch" the PushAction owns. This is problematic.
item = new JObject()
{
{ "id", idStr }, { "value", 0 }
};
await table.InsertAsync(item);
Task pushComplete = service.SyncContext.PushAsync();
// Make sure the PushAction has actually called into our SyncHandler, otherwise the two UpdateOperations could collapse onto it, and
// there won't necessarily even be a second PushAction
await untilAboutToExecuteOp.WaitAsync();
// Add some more operations while that push is in flight. Since these operations affect the same item in someTable, the operations
// will be stuck awaiting the PushAction since it locks on the row.
item = new JObject()
{
{ "id", idStr }, { "value", 1 }
};
Task updateOnce = table.UpdateAsync(item);
item = new JObject()
{
{ "id", idStr }, { "value", 2 }
};
Task updateTwice = table.UpdateAsync(item);
// Before we let the push finish, let's inject a delay that will cause it to take a long time deleting the operation from the queue.
// This will give the other operations, if there's an unaddressed race condition, a chance to wreak havoc on the op queue.
mockLocalStore.SetLookupDelay(500);
// Let the first push finish
untilPendingOpsCreated.Release();
await pushComplete;
mockLocalStore.SetLookupDelay(0);
await updateOnce;
await updateTwice;
// Push again, but now the operation condensed from the two updates should be executed remotely
pushState = (pushState + 1) % 2;
hijack.SetResponseContent(responseContent);
pushComplete = service.SyncContext.PushAsync();
await untilAboutToExecuteOp.WaitAsync(); // not strictly necessary other than to keep the semaphore count at 0
untilPendingOpsCreated.Release();
await pushComplete;
pushState = (pushState + 1) % 2;
}
}
