/// <summary>
/// Compares this activity to other activity and returns list of changed properties.
/// </summary>
/// <param name="Other">Other activity to compare to.</param>
/// <returns>Bit mask information about which properties are different.</returns>
public ActivityChange CompareChangeTo(NeighborActivity Other)
{
ActivityChange res = base.CompareChangeTo(Other);
if (!ByteArrayComparer.Equals(this.PrimaryServerId, Other.PrimaryServerId))
{
res |= ActivityChange.PrimaryServerId;
}
return(res);
}
/// <summary>
/// Compares this activity to other activity and returns list of changed properties.
/// </summary>
/// <param name="Other">Other activity to compare to.</param>
/// <returns>Bit mask information about which properties are different.</returns>
public ActivityChange CompareChangeTo(ActivityBase Other)
{
ActivityChange res = ActivityChange.None;
SemVer thisVersion = new SemVer(this.Version);
SemVer otherVersion = new SemVer(Other.Version);
if (!thisVersion.Equals(otherVersion))
{
res |= ActivityChange.Version;
}
if (this.ActivityId != Other.ActivityId)
{
res |= ActivityChange.ActivityId;
}
if (!ByteArrayComparer.Equals(this.OwnerIdentityId, Other.OwnerIdentityId))
{
res |= ActivityChange.OwnerIdentityId;
}
if (!ByteArrayComparer.Equals(this.OwnerPublicKey, Other.OwnerPublicKey))
{
res |= ActivityChange.OwnerPublicKey;
}
if (!ByteArrayComparer.Equals(this.OwnerProfileServerId, Other.OwnerProfileServerId))
{
res |= ActivityChange.OwnerProfileServerId;
}
if (!ByteArrayComparer.Equals(this.OwnerProfileServerIpAddress, Other.OwnerProfileServerIpAddress))
{
res |= ActivityChange.OwnerProfileServerIpAddress;
}
if (this.OwnerProfileServerPrimaryPort != Other.OwnerProfileServerPrimaryPort)
{
res |= ActivityChange.OwnerProfileServerPrimaryPort;
}
if (this.Type != Other.Type)
{
res |= ActivityChange.Type;
}
if (this.LocationLatitude != Other.LocationLatitude)
{
res |= ActivityChange.LocationLatitude;
}
if (this.LocationLongitude != Other.LocationLongitude)
{
res |= ActivityChange.LocationLongitude;
}
if (this.PrecisionRadius != Other.PrecisionRadius)
{
res |= ActivityChange.PrecisionRadius;
}
if (this.StartTime != Other.StartTime)
{
res |= ActivityChange.StartTime;
}
if (this.ExpirationTime != Other.ExpirationTime)
{
res |= ActivityChange.ExpirationTime;
}
if (this.ExtraData != Other.ExtraData)
{
res |= ActivityChange.ExtraData;
}
return(res);
}
/// <summary>
/// Updates an existing activity in the database. Then a new neighborhood action is created to propagate the changes to the neighborhood
/// if this is required. If the update is rejected, the action is deleted from the database and this is propagated to the neighborhood.
/// <para>Note that the change in activity is not propagated if the client sets no propagation flag in the request, or if only the activity
/// expiration date or its location is changed.</para>
/// </summary>
/// <param name="UpdateRequest">Update request received from the client.</param>
/// <param name="Signature">Signature of the updated activity data from the client.</param>
/// <param name="OwnerIdentityId">Network ID of the client who requested the update.</param>
/// <param name="CloserServerId">If the result is Status.ErrorRejected, this is filled with network identifier of a neighbor server that is closer to the target location.</param>
/// <returns>Status.Ok if the function succeeds,
/// Status.ErrorNotFound if the activity to update does not exist,
/// Status.ErrorRejected if the update was rejected and the client should migrate the activity to closest proximity server,
/// Status.ErrorInvalidValue if the update attempted to change activity's type,
/// Status.ErrorInternal otherwise.</returns>
public async Task <Status> UpdateAndPropagateAsync(UpdateActivityRequest UpdateRequest, byte[] Signature, byte[] OwnerIdentityId, StrongBox <byte[]> CloserServerId)
{
log.Trace("(UpdateRequest.Activity.Id:{0},OwnerIdentityId:'{1}')", UpdateRequest.Activity.Id, OwnerIdentityId.ToHex());
Status res = Status.ErrorInternal;
bool success = false;
bool signalNeighborhoodAction = false;
bool migrateActivity = false;
ActivityInformation activityInformation = UpdateRequest.Activity;
DatabaseLock[] lockObjects = new DatabaseLock[] { UnitOfWork.PrimaryActivityLock, UnitOfWork.FollowerLock, UnitOfWork.NeighborhoodActionLock };
using (IDbContextTransaction transaction = await unitOfWork.BeginTransactionWithLockAsync(lockObjects))
{
try
{
PrimaryActivity existingActivity = (await GetAsync(a => (a.ActivityId == activityInformation.Id) && (a.OwnerIdentityId == OwnerIdentityId))).FirstOrDefault();
if (existingActivity != null)
{
// First, we check whether the activity should be migrated to closer proximity server.
GpsLocation oldLocation = existingActivity.GetLocation();
GpsLocation newLocation = new GpsLocation(activityInformation.Latitude, activityInformation.Longitude);
bool locationChanged = !oldLocation.Equals(newLocation);
bool error = false;
if (locationChanged)
{
List <byte[]> ignoreServerIds = new List <byte[]>(UpdateRequest.IgnoreServerIds.Select(i => i.ToByteArray()));
if (!await unitOfWork.NeighborRepository.IsServerNearestToLocationAsync(newLocation, ignoreServerIds, CloserServerId, ProxMessageBuilder.ActivityMigrationDistanceTolerance))
{
if (CloserServerId.Value != null)
{
migrateActivity = true;
log.Debug("Activity's new location is outside the reach of this proximity server, the activity will be deleted from the database.");
}
else
{
error = true;
}
}
// else No migration needed
}
if (!error)
{
// If it should not be migrated, we update the activity in our database.
if (!migrateActivity)
{
SignedActivityInformation signedActivityInformation = new SignedActivityInformation()
{
Activity = activityInformation,
Signature = ProtocolHelper.ByteArrayToByteString(Signature)
};
PrimaryActivity updatedActivity = ActivityBase.FromSignedActivityInformation <PrimaryActivity>(signedActivityInformation);
ActivityChange changes = existingActivity.CompareChangeTo(updatedActivity);
if ((changes & ActivityChange.Type) == 0)
{
bool propagateChange = false;
if (!UpdateRequest.NoPropagation)
{
// If only changes in the activity are related to location or expiration time, the activity update is not propagated to the neighborhood.
propagateChange = (changes & ~(ActivityChange.LocationLatitude | ActivityChange.LocationLongitude | ActivityChange.PrecisionRadius | ActivityChange.ExpirationTime)) != 0;
}
existingActivity.CopyFromSignedActivityInformation(signedActivityInformation);
Update(existingActivity);
if (propagateChange)
{
// The activity has to be propagated to all our followers we create database actions that will be processed by dedicated thread.
signalNeighborhoodAction = await unitOfWork.NeighborhoodActionRepository.AddActivityFollowerActionsAsync(NeighborhoodActionType.ChangeActivity, existingActivity.ActivityId, existingActivity.OwnerIdentityId);
}
else
{
log.Trace("Change of activity ID {0}, owner identity ID '{1}' won't be propagated to neighborhood.", existingActivity.ActivityId, existingActivity.OwnerIdentityId.ToHex());
}
await unitOfWork.SaveThrowAsync();
transaction.Commit();
success = true;
}
else
{
log.Debug("Activity ID {0}, owner identity ID '{1}' attempt to change type.", activityInformation.Id, OwnerIdentityId.ToHex());
res = Status.ErrorInvalidValue;
}
}
// else this is handled below separately, out of locked section
}
// else Internal error
}
else
{
log.Debug("Activity ID {0}, owner identity ID '{1}' does not exist.", activityInformation.Id, OwnerIdentityId.ToHex());
res = Status.ErrorNotFound;
}
}
catch (Exception e)
{
log.Error("Exception occurred: {0}", e.ToString());
}
if (!success)
{
log.Warn("Rolling back transaction.");
unitOfWork.SafeTransactionRollback(transaction);
}
unitOfWork.ReleaseLock(lockObjects);
}
if (migrateActivity)
{
// If activity should be migrated, we delete it from our database and inform our neighbors.
StrongBox <bool> notFound = new StrongBox <bool>(false);
if (await DeleteAndPropagateAsync(activityInformation.Id, OwnerIdentityId, notFound))
{
if (!notFound.Value)
{
// The activity was deleted from the database and this change will be propagated to the neighborhood.
log.Debug("Update rejected, activity ID {0}, owner identity ID '{1}' deleted.", activityInformation.Id, OwnerIdentityId.ToHex());
res = Status.ErrorRejected;
}
else
{
// Activity of given ID not found among activities created by the client.
res = Status.ErrorNotFound;
}
}
}
if (success)
{
// Send signal to neighborhood action processor to process the new series of actions.
if (signalNeighborhoodAction)
{
Network.NeighborhoodActionProcessor neighborhoodActionProcessor = (Network.NeighborhoodActionProcessor)Base.ComponentDictionary[Network.NeighborhoodActionProcessor.ComponentName];
neighborhoodActionProcessor.Signal();
}
res = Status.Ok;
}
log.Trace("(-):{0}", res);
return(res);
}
