public async Task QueueBackgroundDiagnosticsEventsTablePurge_PurgesTables()
{
IEnvironment testEnvironment = new TestEnvironment();
testEnvironment.SetEnvironmentVariable(EnvironmentSettingNames.AzureWebsitePlaceholderMode, "0");
DiagnosticEventTableStorageRepository repository =
new DiagnosticEventTableStorageRepository(_configuration, _hostIdProvider, testEnvironment, _logger);
// delete any existing non-current diagnostics events tables
string tablePrefix = DiagnosticEventTableStorageRepository.TableNamePrefix;
var currentTable = repository.GetDiagnosticEventsTable();
var tables = await TableStorageHelpers.ListOldTablesAsync(currentTable, repository.TableClient, tablePrefix);
foreach (var table in tables)
{
await table.DeleteIfExistsAsync();
}
// create 3 old tables
for (int i = 0; i < 3; i++)
{
var table = repository.TableClient.GetTableReference($"{tablePrefix}Test{i}");
await TableStorageHelpers.CreateIfNotExistsAsync(table, 2);
}
// verify tables were created
tables = await TableStorageHelpers.ListOldTablesAsync(currentTable, repository.TableClient, tablePrefix);
Assert.Equal(3, tables.Count());
// queue the background purge
TableStorageHelpers.QueueBackgroundTablePurge(currentTable, repository.TableClient, tablePrefix, NullLogger.Instance, 0);
// wait for the purge to complete
await TestHelpers.Await(async() =>
{
tables = await TableStorageHelpers.ListOldTablesAsync(currentTable, repository.TableClient, tablePrefix);
return(tables.Count() == 0);
}, timeout : 5000);
}
internal virtual async Task FlushLogs(CloudTable table = null)
{
if (_environment.IsPlaceholderModeEnabled())
{
return;
}
table = table ?? GetDiagnosticEventsTable();
try
{
bool tableCreated = await TableStorageHelpers.CreateIfNotExistsAsync(table, _tableCreationRetries);
if (tableCreated)
{
TableStorageHelpers.QueueBackgroundTablePurge(table, TableClient, TableNamePrefix, _logger);
}
}
catch (Exception ex)
{
_logger.LogError(ex, $"Unable to create table '{table.Name}' after {_tableCreationRetries} retries. Aborting write operation {ex}");
// Clearing the memory cache to avoid memory build up.
_events.Clear();
return;
}
// Assigning a new empty directory to reset the event count in the new duration window.
// All existing events are logged to other logging pipelines already.
ConcurrentDictionary <string, DiagnosticEvent> tempDictionary = _events;
_events = new ConcurrentDictionary <string, DiagnosticEvent>();
if (tempDictionary.Count > 0)
{
await ExecuteBatchAsync(tempDictionary, table);
}
}