/// <summary>
/// Asynchronously retrieves logs from storage and flags them to avoid duplicate retrievals on subsequent calls
/// </summary>
/// <param name="channelName">Name of the channel to retrieve logs from</param>
/// <param name="limit">The maximum number of logs to retrieve</param>
/// <param name="logs">A list to which the retrieved logs will be added</param>
/// <returns>A batch ID for the set of returned logs; null if no logs are found</returns>
/// <exception cref="StorageException"/>
public Task <string> GetLogsAsync(string channelName, int limit, List <Log> logs)
{
return(AddTaskToQueue(() =>
{
logs?.Clear();
var retrievedLogs = new List <Log>();
AppCenterLog.Debug(AppCenterLog.LogTag,
$"Trying to get up to {limit} logs from storage for {channelName}");
var idPairs = new List <Tuple <Guid?, long> >();
var failedToDeserializeALog = false;
var retrievedEntries =
_storageAdapter.GetAsync <LogEntry>(entry => entry.Channel == channelName, limit)
.GetAwaiter().GetResult();
foreach (var entry in retrievedEntries)
{
if (_pendingDbIdentifiers.Contains(entry.Id))
{
continue;
}
try
{
var log = LogSerializer.DeserializeLog(entry.Log);
retrievedLogs.Add(log);
idPairs.Add(Tuple.Create(log.Sid, Convert.ToInt64(entry.Id)));
}
catch (JsonException e)
{
AppCenterLog.Error(AppCenterLog.LogTag, "Cannot deserialize a log in storage", e);
failedToDeserializeALog = true;
_storageAdapter.DeleteAsync <LogEntry>(row => row.Id == entry.Id)
.GetAwaiter().GetResult();
}
}
if (failedToDeserializeALog)
{
AppCenterLog.Warn(AppCenterLog.LogTag, "Deleted logs that could not be deserialized");
}
if (idPairs.Count == 0)
{
AppCenterLog.Debug(AppCenterLog.LogTag,
$"No available logs in storage for channel '{channelName}'");
return null;
}
// Process the results
var batchId = Guid.NewGuid().ToString();
ProcessLogIds(channelName, batchId, idPairs);
logs?.AddRange(retrievedLogs);
return batchId;
}));
}
/// <summary>
/// Asynchronously retrieves logs from storage and flags them to avoid duplicate retrievals on subsequent calls
/// </summary>
/// <param name="channelName">Name of the channel to retrieve logs from</param>
/// <param name="limit">The maximum number of logs to retrieve</param>
/// <param name="logs">A list to which the retrieved logs will be added</param>
/// <returns>A batch ID for the set of returned logs; null if no logs are found</returns>
/// <exception cref="StorageException"/>
public async Task <string> GetLogsAsync(string channelName, int limit, List <Log> logs)
{
var task = new Task <string>(() =>
{
logs?.Clear();
var retrievedLogs = new List <Log>();
MobileCenterLog.Debug(MobileCenterLog.LogTag,
$"Trying to get up to {limit} logs from storage for {channelName}");
var idPairs = new List <Tuple <Guid?, long> >();
var failedToDeserializeALog = false;
var retrievedEntries =
_storageAdapter.GetAsync <LogEntry>(entry => entry.Channel == channelName, limit)
.Result;
foreach (var entry in retrievedEntries)
{
if (_pendingDbIdentifiers.Contains(entry.Id))
{
continue;
}
try
{
var log = LogSerializer.DeserializeLog(entry.Log);
retrievedLogs.Add(log);
idPairs.Add(Tuple.Create(log.Sid, Convert.ToInt64(entry.Id)));
}
catch (JsonException e)
{
MobileCenterLog.Error(MobileCenterLog.LogTag, "Cannot deserialize a log in storage", e);
failedToDeserializeALog = true;
_storageAdapter.DeleteAsync <LogEntry>(row => row.Id == entry.Id)
.Wait();
}
}
if (failedToDeserializeALog)
{
MobileCenterLog.Warn(MobileCenterLog.LogTag, "Deleted logs that could not be deserialized");
}
if (idPairs.Count == 0)
{
MobileCenterLog.Debug(MobileCenterLog.LogTag,
$"No available logs in storage for channel '{channelName}'");
return(null);
}
// Process the results
var batchId = Guid.NewGuid().ToString();
ProcessLogIds(channelName, batchId, idPairs);
logs?.AddRange(retrievedLogs);
return(batchId);
});
try
{
_queue.Add(task);
}
catch (InvalidOperationException)
{
throw new StorageException("The operation has been cancelled");
}
_flushSemaphore.Release();
return(await task.ConfigureAwait(false));
}