/// <inheritdoc />
public MaybeResponse <ReadJournalResponse> ReadJournal(ReadJournalRequest request, Action <UsnRecord> onUsnRecordReceived)
{
Contract.Assert(request.VolumeGuidPath.IsValid);
SafeFileHandle volumeHandle;
OpenFileResult volumeOpenResult = OpenVolumeHandle(request.VolumeGuidPath, out volumeHandle);
using (volumeHandle)
{
if (!volumeOpenResult.Succeeded)
{
string message = I($"Failed to open a volume handle for the volume '{request.VolumeGuidPath.Path}'");
return(new MaybeResponse <ReadJournalResponse>(
new ErrorResponse(ErrorStatus.FailedToOpenVolumeHandle, message)));
}
Usn startUsn = request.StartUsn;
Usn endUsn = request.EndUsn ?? Usn.Zero;
int extraReadCount = request.ExtraReadCount ?? -1;
long timeLimitInTicks = request.TimeLimit?.Ticks ?? -1;
var sw = new StopwatchVar();
using (var swRun = sw.Start())
{
byte[] buffer = new byte[JournalReadBufferSize];
while (true)
{
if (timeLimitInTicks >= 0 && timeLimitInTicks < swRun.ElapsedTicks)
{
return(new MaybeResponse <ReadJournalResponse>(
new ReadJournalResponse(status: ReadUsnJournalStatus.Success, nextUsn: startUsn, timeout: true)));
}
ReadUsnJournalResult result = FileUtilities.TryReadUsnJournal(
volumeHandle,
buffer,
request.JournalId,
startUsn,
isJournalUnprivileged: IsJournalUnprivileged);
if (!result.Succeeded)
{
// Bug #1164760 shows that the next USN can be non-zero.
return(new MaybeResponse <ReadJournalResponse>(new ReadJournalResponse(status: result.Status, nextUsn: result.NextUsn)));
}
if (result.Records.Count == 0)
{
return
(new MaybeResponse <ReadJournalResponse>(
new ReadJournalResponse(status: ReadUsnJournalStatus.Success, nextUsn: result.NextUsn)));
}
foreach (var record in result.Records)
{
onUsnRecordReceived(record);
}
Contract.Assume(startUsn < result.NextUsn);
startUsn = result.NextUsn;
if (!endUsn.IsZero)
{
if (startUsn >= endUsn && (--extraReadCount) < 0)
{
return(new MaybeResponse <ReadJournalResponse>(
new ReadJournalResponse(status: ReadUsnJournalStatus.Success, nextUsn: result.NextUsn)));
}
}
}
}
}
}
public async Task <RpcCallResult <Unit> > CallAsync(
Func <CallOptions, AsyncUnaryCall <RpcResponse> > func,
string operationName,
CancellationToken cancellationToken = default(CancellationToken),
bool waitForConnection = false)
{
TimeSpan waitForConnectionDuration = TimeSpan.Zero;
if (waitForConnection)
{
var waitForConnectionSw = new StopwatchVar();
using (waitForConnectionSw.Start())
{
try
{
Logger.Log.DistributionTrace(m_loggingContext, $"Attempt to connect to '{Channel.Target}' for operation {operationName}. ChannelState '{Channel.State}'");
await Channel.ConnectAsync(DateTime.UtcNow.Add(InactiveTimeout));
Logger.Log.DistributionTrace(m_loggingContext, $"Connected to '{Channel.Target}' for operation {operationName}. Duration {waitForConnectionSw.TotalElapsed.TotalMilliseconds}ms.");
}
catch (OperationCanceledException e)
{
var duration = waitForConnectionSw.TotalElapsed;
Logger.Log.DistributionTrace(m_loggingContext, $"Failed to connect to '{Channel.Target}' for operation {operationName}. Duration {duration.TotalMilliseconds}ms. Failure {e.Message}");
return(new RpcCallResult <Unit>(RpcCallResultState.Cancelled, attempts: 1, duration: TimeSpan.Zero, waitForConnectionDuration: duration));
}
}
waitForConnectionDuration = waitForConnectionSw.TotalElapsed;
}
var callDurationSw = new StopwatchVar();
using (callDurationSw.Start())
{
try
{
var callOptions = new CallOptions(
deadline: DateTime.UtcNow.Add(CallTimeout),
cancellationToken: cancellationToken);
Logger.Log.DistributionTrace(m_loggingContext, $"Attempt to call '{Channel.Target}' for operation {operationName}. ChannelState '{Channel.State}'");
await func(callOptions);
Logger.Log.DistributionTrace(m_loggingContext, $"Called '{Channel.Target}' for operation {operationName}. Duration {callDurationSw.TotalElapsed.TotalMilliseconds}ms.");
}
catch (RpcException e)
{
RpcCallResultState state = e.Status.StatusCode == StatusCode.Cancelled ? RpcCallResultState.Cancelled : RpcCallResultState.Failed;
Logger.Log.DistributionTrace(m_loggingContext, $"Failed to call '{Channel.Target}' for operation {operationName}. Duration {callDurationSw.TotalElapsed.TotalMilliseconds}ms. Failure {e.Message}");
return(new RpcCallResult <Unit>(
state,
attempts: 1,
duration: callDurationSw.TotalElapsed,
waitForConnectionDuration: waitForConnectionDuration,
lastFailure: state == RpcCallResultState.Failed
? new RecoverableExceptionFailure(new BuildXLException(e.Message, e))
: null));
}
}
return(new RpcCallResult <Unit>(Unit.Void, attempts: 1, duration: callDurationSw.TotalElapsed, waitForConnectionDuration: waitForConnectionDuration));
}
