private void SetMaxAge()
{
var metaStreamId = SystemStreams.MetastreamOf(SystemStreams.ScavengesStream);
_ioDispatcher.ReadBackward(metaStreamId, -1, 1, false, SystemAccount.Principal, readResult =>
{
if (readResult.Result == ReadStreamResult.Success || readResult.Result == ReadStreamResult.NoStream)
{
if (readResult.Events.Length == 1)
{
var currentMetadata = StreamMetadata.FromJsonBytes(readResult.Events[0].Event.Data);
if (currentMetadata.MaxAge == _scavengeHistoryMaxAge)
{
Log.Debug("Max age already set for the {0} stream.", SystemStreams.ScavengesStream);
return;
}
}
Log.Debug("Setting max age for the {0} stream to {1}.", SystemStreams.ScavengesStream, _scavengeHistoryMaxAge);
var metadata = new StreamMetadata(maxAge: _scavengeHistoryMaxAge);
var metaStreamEvent = new Event(Guid.NewGuid(), SystemEventTypes.StreamMetadata, isJson: true, data: metadata.ToJsonBytes(), metadata: null);
_ioDispatcher.WriteEvent(metaStreamId, ExpectedVersion.Any, metaStreamEvent, SystemAccount.Principal, m => {
if (m.Result != OperationResult.Success)
{
Log.Error("Failed to write the $maxAge of {0} days metadata for the {1} stream. Reason: {2}", _scavengeHistoryMaxAge.TotalDays, SystemStreams.ScavengesStream, m.Result);
}
});
}
});
}
public Task<StreamMetadataResult> GetStreamMetadataAsync(string stream, UserCredentials userCredentials = null)
{
return GetStreamMetadataAsRawBytesAsync(stream, userCredentials).ContinueWith(t =>
{
if (t.Exception != null)
throw t.Exception.InnerException;
var res = t.Result;
if (res.StreamMetadata == null || res.StreamMetadata.Length == 0)
return new StreamMetadataResult(res.Stream, res.IsStreamDeleted, res.MetastreamVersion, StreamMetadata.Create());
var metadata = StreamMetadata.FromJsonBytes(res.StreamMetadata);
return new StreamMetadataResult(res.Stream, res.IsStreamDeleted, res.MetastreamVersion, metadata);
});
}
private void SetScavengeStreamMetadata()
{
var metaStreamId = SystemStreams.MetastreamOf(SystemStreams.ScavengesStream);
_ioDispatcher.ReadBackward(metaStreamId, -1, 1, false, SystemAccount.Principal, readResult => {
if (readResult.Result == ReadStreamResult.Success || readResult.Result == ReadStreamResult.NoStream)
{
if (readResult.Events.Length == 1)
{
var currentMetadata = StreamMetadata.FromJsonBytes(readResult.Events[0].Event.Data);
var hasProperACL = currentMetadata.Acl != null &&
currentMetadata.Acl.ReadRoles != null &&
currentMetadata.Acl.ReadRoles.Contains(x => x.Equals("$ops"));
if (currentMetadata.MaxAge == _scavengeHistoryMaxAge && hasProperACL)
{
Log.Debug("Max age and $ops read permission already set for the {stream} stream.", SystemStreams.ScavengesStream);
return;
}
}
Log.Debug("Setting max age for the {stream} stream to {maxAge}.", SystemStreams.ScavengesStream,
_scavengeHistoryMaxAge);
Log.Debug("Setting $ops read permission for the {stream} stream", SystemStreams.ScavengesStream);
var acl = new StreamAcl(
new string[] { "$ops" },
new string[] {},
new string[] {},
new string[] {},
new string[] {}
);
var metadata = new StreamMetadata(maxAge: _scavengeHistoryMaxAge, acl: acl);
var metaStreamEvent = new Event(Guid.NewGuid(), SystemEventTypes.StreamMetadata, isJson: true,
data: metadata.ToJsonBytes(), metadata: null);
_ioDispatcher.WriteEvent(metaStreamId, ExpectedVersion.Any, metaStreamEvent,
SystemAccount.Principal, m => {
if (m.Result != OperationResult.Success)
{
Log.Error(
"Failed to write the $maxAge of {days} days and set $ops permission for the {stream} stream. Reason: {reason}",
_scavengeHistoryMaxAge.TotalDays, SystemStreams.ScavengesStream, m.Result);
}
});
}
});
}
GetStreamMetadataAsync(string stream, UserCredentials userCredentials = null)
{
return(GetStreamMetadataAsRawBytesAsync(stream, userCredentials).ContinueWith(t => {
ThrowIfNotNull(t.Exception);
var res = t.Result;
if (res.StreamMetadata == null || res.StreamMetadata.Length == 0)
{
return new StreamMetadataResult(res.Stream, res.IsStreamDeleted, res.MetastreamVersion,
StreamMetadata.Create(), res.MetaEventCreated);
}
var metadata = StreamMetadata.FromJsonBytes(res.StreamMetadata);
return new StreamMetadataResult(res.Stream, res.IsStreamDeleted, res.MetastreamVersion, metadata, res.MetaEventCreated);
}));
}
