private async Task LoadOperationItem(MobileServiceTableOperation operation, OperationBatch batch)
{
// only read the item from store if it is not in the operation already
if (operation.Item == null)
{
await TryStoreOperation(async() =>
{
operation.Item = await this.Store.LookupAsync(operation.TableName, operation.ItemId) as JObject;
}, batch, "Failed to read the item from local store.");
// Add sync error if item is not found.
if (operation.Item == null)
{
// Create an item with only id to be able handle error properly.
var item = new JObject(new JProperty(MobileServiceSystemColumns.Id, operation.ItemId));
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
null,
operation.TableName,
item, null, null)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
}
}
private async Task TryCancelOperation(MobileServiceTableOperationError error)
{
if (!await this.opQueue.DeleteAsync(error.Id, error.OperationVersion))
{
throw new InvalidOperationException("The operation has been updated and cannot be cancelled.");
}
// delete errors for cancelled operation
await this.Store.DeleteAsync(MobileServiceLocalSystemTables.SyncErrors, error.Id);
}
public Task CancelAndUpdateItemAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value <string>(MobileServiceSystemColumns.Id);
return(this.ExecuteOperationSafeAsync(itemId, error.TableName, async() =>
{
await this.TryCancelOperation(error);
await this.Store.UpsertAsync(error.TableName, item, fromServer: true);
}));
}
public Task CancelAndDiscardItemAsync(MobileServiceTableOperationError error)
{
string itemId = error.Item.Value <string>(MobileServiceSystemColumns.Id);
return(this.ExecuteOperationSafeAsync(itemId, error.TableName, async() =>
{
await this.TryCancelOperation(error);
await this.Store.DeleteAsync(error.TableName, itemId);
}));
}
private async Task TryUpdateOperation(MobileServiceTableOperationError error, JObject item)
{
if (!await this.opQueue.UpdateAsync(error.Id, error.OperationVersion, item))
{
throw new InvalidOperationException("The operation has been updated and cannot be updated again");
}
// delete errors for updated operation
await this.Store.DeleteAsync(MobileServiceLocalSystemTables.SyncErrors, error.Id);
}
public Task UpdateOperationAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value <string>(MobileServiceSystemColumns.Id);
return(this.ExecuteOperationSafeAsync(itemId, error.TableName, async() =>
{
await this.TryUpdateOperation(error, item);
if (error.OperationKind != MobileServiceTableOperationKind.Delete)
{
await this.Store.UpsertAsync(error.TableName, item, fromServer: true);
}
}));
}
public Task CancelAndDiscardItemAsync(MobileServiceTableOperationError error)
{
string itemId = error.Item.Value <string>(MobileServiceSystemColumns.Id);
return(this.ExecuteOperationSafeAsync(itemId, error.TableName, async() =>
{
await this.TryCancelOperation(error);
using (var trackedStore = StoreChangeTrackerFactory.CreateTrackedStore(this.Store, StoreOperationSource.LocalConflictResolution, this.storeTrackingOptions, this.client.EventManager, this.settings))
{
await trackedStore.DeleteAsync(error.TableName, itemId);
}
}));
}
public Task UpdateOperationAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value <string>(MobileServiceSystemColumns.Id);
return(this.ExecuteOperationSafeAsync(itemId, error.TableName, async() =>
{
await this.TryUpdateOperation(error, item);
if (error.OperationKind != MobileServiceTableOperationKind.Delete)
{
using (var trackedStore = StoreChangeTrackerFactory.CreateTrackedStore(this.Store, StoreOperationSource.LocalConflictResolution, this.storeTrackingOptions, this.client.EventManager, this.settings))
{
await trackedStore.UpsertAsync(error.TableName, item, fromServer: true);
}
}
}));
}
/// <summary>
/// Loads all the sync errors in local store that are recorded for this batch.
/// </summary>
/// <param name="serializerSettings">the serializer settings to use for reading the errors.</param>
/// <returns>List of sync errors.</returns>
public async Task <IList <MobileServiceTableOperationError> > LoadSyncErrorsAsync(MobileServiceJsonSerializerSettings serializerSettings)
{
var errors = new List <MobileServiceTableOperationError>();
JToken result = await this.Store.ReadAsync(new MobileServiceTableQueryDescription(MobileServiceLocalSystemTables.SyncErrors));
if (result is JArray)
{
foreach (JObject error in result)
{
var obj = MobileServiceTableOperationError.Deserialize(error, serializerSettings);
obj.Context = this.context;
errors.Add(obj);
}
}
return(errors);
}
public async Task PushAsync_ReplaysStoredErrors_IfTheyAreInStore()
{
var error = new MobileServiceTableOperationError("abc",
1,
MobileServiceTableOperationKind.Update,
HttpStatusCode.PreconditionFailed,
"test",
new JObject(),
"{}",
new JObject());
var store = new MobileServiceLocalStoreMock();
await store.UpsertAsync(MobileServiceLocalSystemTables.SyncErrors, error.Serialize(), fromServer: false);
var hijack = new TestHttpHandler();
IMobileServiceClient service = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp, hijack);
await service.SyncContext.InitializeAsync(store, new MobileServiceSyncHandler());
var ex = await ThrowsAsync<MobileServicePushFailedException>(service.SyncContext.PushAsync);
}
/// <summary>
/// Defines all the system tables on the store
/// </summary>
/// <param name="store">An instance of <see cref="IMobileServiceLocalStore"/></param>
public static void DefineAll(MobileServiceLocalStore store)
{
MobileServiceTableOperation.DefineTable(store);
MobileServiceTableOperationError.DefineTable(store);
MobileServiceSyncSettingsManager.DefineTable(store);
}
private async Task TryCancelOperation(MobileServiceTableOperationError error)
{
if (!await this.opQueue.DeleteAsync(error.Id, error.OperationVersion))
{
throw new InvalidOperationException("The operation has been updated and cannot be cancelled.");
}
// delete errors for cancelled operation
await this.Store.DeleteAsync(MobileServiceLocalSystemTables.SyncErrors, error.Id);
}
public Task CancelAndDiscardItemAsync(MobileServiceTableOperationError error)
{
string itemId = error.Item.Value<string>(MobileServiceSystemColumns.Id);
return this.ExecuteOperationSafeAsync(itemId, error.TableName, async () =>
{
await this.TryCancelOperation(error);
using (var trackedStore = StoreChangeTrackerFactory.CreateTrackedStore(this.Store, StoreOperationSource.LocalConflictResolution, this.storeTrackingOptions, this.client.EventManager, this.settings))
{
await trackedStore.DeleteAsync(error.TableName, itemId);
}
});
}
public Task UpdateOperationAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value<string>(MobileServiceSystemColumns.Id);
return this.ExecuteOperationSafeAsync(itemId, error.TableName, async () =>
{
await this.TryUpdateOperation(error, item);
if (error.OperationKind != MobileServiceTableOperationKind.Delete)
{
using (var trackedStore = StoreChangeTrackerFactory.CreateTrackedStore(this.Store, StoreOperationSource.LocalConflictResolution, this.storeTrackingOptions, this.client.EventManager, this.settings))
{
await trackedStore.UpsertAsync(error.TableName, item, fromServer: true);
}
}
});
}
private async Task UpdateOperationAsync_ConflictOperation_WithNotificationsEnabled_UsesTheCorrectStoreSource()
{
var client = new MobileServiceClient("http://www.test.com");
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
await context.InitializeAsync(store, StoreTrackingOptions.NotifyLocalConflictResolutionOperations);
var manualResetEvent = new ManualResetEventSlim();
string operationId = "abc";
string itemId = "def";
string tableName = "test";
store.TableMap[MobileServiceLocalSystemTables.SyncErrors] = new Dictionary<string, JObject>() { { operationId, new JObject() { { "id", operationId }, { "version", 1 } } } };
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject() { { "id", operationId }, { "version", 1 } });
store.TableMap.Add(tableName, new Dictionary<string, JObject>() { { itemId, new JObject() } });
// operation exists before cancel
Assert.IsNotNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// item exists before upsert
Assert.IsNotNull(await store.LookupAsync(tableName, itemId));
var error = new MobileServiceTableOperationError(operationId,
1,
MobileServiceTableOperationKind.Update,
HttpStatusCode.Conflict,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
var item = new JObject() { { "id", itemId }, { "name", "unknown" } };
bool sourceIsLocalConflict = false;
IDisposable subscription = client.EventManager.Subscribe<StoreOperationCompletedEvent>(o =>
{
sourceIsLocalConflict = o.Operation.Source == StoreOperationSource.LocalConflictResolution;
manualResetEvent.Set();
});
await context.UpdateOperationAsync(error, item);
bool resetEventSignaled = manualResetEvent.Wait(1000);
subscription.Dispose();
Assert.IsTrue(resetEventSignaled);
Assert.IsTrue(sourceIsLocalConflict);
}
public async Task CancelAndDiscardItemAsync_DeletesTheItemInLocalStore_AndDeletesTheOperationAndError()
{
var client = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp);
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
await context.InitializeAsync(store);
string operationId = "abc";
string itemId = "def";
string tableName = "test";
store.TableMap[MobileServiceLocalSystemTables.SyncErrors] = new Dictionary<string, JObject>() { { operationId, new JObject() } };
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject());
store.TableMap.Add(tableName, new Dictionary<string, JObject>() { { itemId, new JObject() } });
// operation exists before cancel
Assert.IsNotNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// item exists before upsert
Assert.IsNotNull(await store.LookupAsync(tableName, itemId));
var error = new MobileServiceTableOperationError(operationId,
0,
MobileServiceTableOperationKind.Update,
HttpStatusCode.Conflict,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
await context.CancelAndDiscardItemAsync(error);
// operation is deleted
Assert.IsNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// error is deleted
Assert.IsNull(await store.LookupAsync(MobileServiceLocalSystemTables.SyncErrors, operationId));
// item is upserted
Assert.IsNull(await store.LookupAsync(tableName, itemId));
}
private async Task <bool> ExecuteOperationAsync(MobileServiceTableOperation operation, OperationBatch batch)
{
if (operation.IsCancelled || this.CancellationToken.IsCancellationRequested)
{
return(false);
}
operation.Table = await this.context.GetTable(operation.TableName, this.client);
await this.LoadOperationItem(operation, batch);
if (this.CancellationToken.IsCancellationRequested)
{
return(false);
}
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Attempted, batch);
// strip out system properties before executing the operation
operation.Item = MobileServiceSyncTable.RemoveSystemPropertiesKeepVersion(operation.Item);
JObject result = null;
Exception error = null;
try
{
result = await batch.SyncHandler.ExecuteTableOperationAsync(operation);
}
catch (Exception ex)
{
error = ex;
}
if (error != null)
{
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Failed, batch);
if (TryAbortBatch(batch, error))
{
// there is no error to save in sync error and no result to capture
// this operation will be executed again next time the push happens
return(false);
}
}
// save the result if ExecuteTableOperation did not throw
if (error == null && result.IsValidItem() && operation.CanWriteResultToStore)
{
await TryStoreOperation(() => this.Store.UpsertAsync(operation.TableName, result, fromServer: true), batch, "Failed to update the item in the local store.");
}
else if (error != null)
{
HttpStatusCode?statusCode = null;
string rawResult = null;
var iox = error as MobileServiceInvalidOperationException;
if (iox != null && iox.Response != null)
{
statusCode = iox.Response.StatusCode;
Tuple <string, JToken> content = await MobileServiceTable.ParseContent(iox.Response, this.client.SerializerSettings);
rawResult = content.Item1;
result = content.Item2.ValidItemOrNull();
}
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
statusCode,
operation.TableName,
operation.Item,
rawResult,
result)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
bool success = error == null;
return(success);
}
public Task CancelAndUpdateItemAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value<string>(MobileServiceSystemColumns.Id);
return this.ExecuteOperationSafeAsync(itemId, error.TableName, async () =>
{
await this.TryCancelOperation(error);
await this.Store.UpsertAsync(error.TableName, item, fromServer: true);
});
}
/// <summary>
/// Adds a sync error to local store for this batch
/// </summary>
/// <param name="error">The sync error that occurred.</param>
public Task AddSyncErrorAsync(MobileServiceTableOperationError error)
{
return(this.Store.UpsertAsync(MobileServiceLocalSystemTables.SyncErrors, error.Serialize(), fromServer: false));
}
private async Task<bool> ExecuteOperationAsync(MobileServiceTableOperation operation, OperationBatch batch)
{
if (operation.IsCancelled || this.CancellationToken.IsCancellationRequested)
{
return false;
}
operation.Table = await this.context.GetTable(operation.TableName, this.client);
await this.LoadOperationItem(operation, batch);
if (this.CancellationToken.IsCancellationRequested)
{
return false;
}
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Attempted, batch);
// strip out system properties before executing the operation
operation.Item = MobileServiceSyncTable.RemoveSystemPropertiesKeepVersion(operation.Item);
JObject result = null;
Exception error = null;
try
{
result = await batch.SyncHandler.ExecuteTableOperationAsync(operation);
}
catch (Exception ex)
{
error = ex;
}
if (error != null)
{
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Failed, batch);
if (TryAbortBatch(batch, error))
{
// there is no error to save in sync error and no result to capture
// this operation will be executed again next time the push happens
return false;
}
}
// save the result if ExecuteTableOperation did not throw
if (error == null && result.IsValidItem() && operation.CanWriteResultToStore)
{
await TryStoreOperation(() => this.Store.UpsertAsync(operation.TableName, result, fromServer: true), batch, "Failed to update the item in the local store.");
}
else if (error != null)
{
HttpStatusCode? statusCode = null;
string rawResult = null;
var iox = error as MobileServiceInvalidOperationException;
if (iox != null && iox.Response != null)
{
statusCode = iox.Response.StatusCode;
Tuple<string, JToken> content = await MobileServiceTable.ParseContent(iox.Response, this.client.SerializerSettings);
rawResult = content.Item1;
result = content.Item2.ValidItemOrNull();
}
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
statusCode,
operation.TableName,
operation.Item,
rawResult,
result)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
bool success = error == null;
return success;
}
public async Task UpdateOperationAsync_UpsertsTheItemInLocalStore_AndDeletesTheError_AndUpdatesTheOperation()
{
var client = new MobileServiceClient("http://www.test.com");
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
await context.InitializeAsync(store);
string operationId = "abc";
string itemId = "def";
string tableName = "test";
store.TableMap[MobileServiceLocalSystemTables.SyncErrors] = new Dictionary<string, JObject>() { { operationId, new JObject() { { "id", operationId }, { "version", 1 } } } };
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject() { { "id", operationId }, { "version", 1 } });
store.TableMap.Add(tableName, new Dictionary<string, JObject>() { { itemId, new JObject() } });
// operation exists before cancel
Assert.IsNotNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// item exists before upsert
Assert.IsNotNull(await store.LookupAsync(tableName, itemId));
var error = new MobileServiceTableOperationError(operationId,
1,
MobileServiceTableOperationKind.Update,
HttpStatusCode.Conflict,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
var item = new JObject() { { "id", itemId }, { "name", "unknown" } };
await context.UpdateOperationAsync(error, item);
// operation is updated
Assert.IsNotNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// error is deleted
Assert.IsNull(await store.LookupAsync(MobileServiceLocalSystemTables.SyncErrors, operationId));
JObject upserted = await store.LookupAsync(tableName, itemId);
// item is upserted
Assert.IsNotNull(upserted);
Assert.AreEqual(item, upserted);
}
/// <summary>
/// Adds a sync error to local store for this batch
/// </summary>
/// <param name="error">The sync error that occurred.</param>
public Task AddSyncErrorAsync(MobileServiceTableOperationError error)
{
return this.Store.UpsertAsync(MobileServiceLocalSystemTables.SyncErrors, error.Serialize(), fromServer: false);
}
public async Task UpdateOperationAsync_UpsertTheItemInOperation_AndDeletesTheError()
{
var client = new MobileServiceClient("http://www.test.com");
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
await context.InitializeAsync(store);
string operationId = "abc";
string itemId = "def";
string tableName = "test";
var item = new JObject() { { "id", itemId }, { "name", "unknown" } };
store.TableMap[MobileServiceLocalSystemTables.SyncErrors] = new Dictionary<string, JObject>() { { operationId, new JObject() { { "id", operationId }, { "version", 1 } } } };
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject() { { "id", operationId }, { "version", 1 }, { "item", item.ToString() }, { "kind", (int)MobileServiceTableOperationKind.Delete } });
// operation exists before cancel
Assert.IsNotNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
// item does not exist
Assert.IsNull(await store.LookupAsync(tableName, itemId));
var error = new MobileServiceTableOperationError(operationId,
1,
MobileServiceTableOperationKind.Delete,
HttpStatusCode.PreconditionFailed,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
var item2 = new JObject() { { "id", itemId }, { "name", "unknown" }, { "version", 2 } };
await context.UpdateOperationAsync(error, item2);
var operation = await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId);
// operation is updated
Assert.IsNotNull(operation);
// error is deleted
Assert.IsNull(await store.LookupAsync(MobileServiceLocalSystemTables.SyncErrors, operationId));
Assert.AreEqual(operation.GetValue("item").ToString(), item2.ToString(Formatting.None));
}
public Task UpdateOperationAsync(MobileServiceTableOperationError error, JObject item)
{
string itemId = error.Item.Value<string>(MobileServiceSystemColumns.Id);
return this.ExecuteOperationSafeAsync(itemId, error.TableName, async () =>
{
await this.TryUpdateOperation(error, item);
if (error.OperationKind != MobileServiceTableOperationKind.Delete)
{
await this.Store.UpsertAsync(error.TableName, item, fromServer: true);
}
});
}
private async Task TestOperationModifiedException(bool operationExists, Func<MobileServiceTableOperationError, MobileServiceSyncContext, Task> action, String errorMessage)
{
var client = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp);
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
await context.InitializeAsync(store);
string operationId = "abc";
string itemId = "def";
string tableName = "test";
if (operationExists)
{
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject() { { "version", 3 } });
}
else
{
// operation exists before cancel
Assert.IsNull(await store.LookupAsync(MobileServiceLocalSystemTables.OperationQueue, operationId));
}
var error = new MobileServiceTableOperationError(operationId,
1,
MobileServiceTableOperationKind.Update,
HttpStatusCode.Conflict,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
var ex = await ThrowsAsync<InvalidOperationException>(() => action(error, context));
Assert.AreEqual(ex.Message, errorMessage);
}
private async Task TryUpdateOperation(MobileServiceTableOperationError error, JObject item)
{
if (!await this.opQueue.UpdateAsync(error.Id, error.OperationVersion, item))
{
throw new InvalidOperationException("The operation has been updated and cannot be updated again");
}
// delete errors for updated operation
await this.Store.DeleteAsync(MobileServiceLocalSystemTables.SyncErrors, error.Id);
}
private async Task ConflictOperation_WithNotificationsEnabled_UsesTheCorrectStoreOperationSource(Func<MobileServiceSyncContext, MobileServiceTableOperationError, Task> handler)
{
var client = new MobileServiceClient(MobileAppUriValidator.DummyMobileApp);
var store = new MobileServiceLocalStoreMock();
var context = new MobileServiceSyncContext(client);
var manualResetEvent = new ManualResetEventSlim();
await context.InitializeAsync(store, StoreTrackingOptions.NotifyLocalConflictResolutionOperations);
string operationId = "abc";
string itemId = string.Empty;
string tableName = "test";
store.TableMap[MobileServiceLocalSystemTables.OperationQueue].Add(operationId, new JObject() { { "version", 1 } });
var error = new MobileServiceTableOperationError(operationId,
1,
MobileServiceTableOperationKind.Update,
HttpStatusCode.Conflict,
tableName,
item: new JObject() { { "id", itemId } },
rawResult: "{}",
result: new JObject());
bool sourceIsLocalConflict = false;
IDisposable subscription = client.EventManager.Subscribe<StoreOperationCompletedEvent>(o =>
{
sourceIsLocalConflict = o.Operation.Source == StoreOperationSource.LocalConflictResolution;
manualResetEvent.Set();
});
await handler(context, error);
bool resetEventSignaled = manualResetEvent.Wait(1000);
subscription.Dispose();
Assert.IsTrue(resetEventSignaled);
Assert.IsTrue(sourceIsLocalConflict);
}
public Task CancelAndDiscardItemAsync(MobileServiceTableOperationError error)
{
string itemId = error.Item.Value<string>(MobileServiceSystemColumns.Id);
return this.ExecuteOperationSafeAsync(itemId, error.TableName, async () =>
{
await this.TryCancelOperation(error);
await this.Store.DeleteAsync(error.TableName, itemId);
});
}
