private Type0CommandMessageSection <BsonDocument> CreateType0Section(ConnectionDescription connectionDescription)
{
var extraElements = new List <BsonElement>();
AddIfNotAlreadyAdded("$db", _databaseNamespace.DatabaseName);
if (connectionDescription?.IsMasterResult.ServerType != ServerType.Standalone &&
_readPreference != null &&
_readPreference != ReadPreference.Primary)
{
var readPreferenceDocument = QueryHelper.CreateReadPreferenceDocument(_readPreference);
AddIfNotAlreadyAdded("$readPreference", readPreferenceDocument);
}
if (_session.Id != null)
{
if (IsSessionAcknowledged())
{
AddIfNotAlreadyAdded("lsid", _session.Id);
}
else
{
if (_session.IsImplicit)
{
// do not set sessionId if session is implicit and write is unacknowledged
}
else
{
throw new InvalidOperationException("Explicit session must not be used with unacknowledged writes.");
}
}
}
var snapshotReadConcernDocument = ReadConcernHelper.GetReadConcernForSnapshotSesssion(_session, connectionDescription);
if (snapshotReadConcernDocument != null)
{
extraElements.Add(new BsonElement("readConcern", snapshotReadConcernDocument));
}
if (_session.ClusterTime != null)
{
AddIfNotAlreadyAdded("$clusterTime", _session.ClusterTime);
}
#pragma warning disable 618
Action <BsonWriterSettings> writerSettingsConfigurator = null;
if (BsonDefaults.GuidRepresentationMode == GuidRepresentationMode.V2)
{
writerSettingsConfigurator = s => s.GuidRepresentation = GuidRepresentation.Unspecified;
}
#pragma warning restore 618
_session.AboutToSendCommand();
if (_session.IsInTransaction)
{
var transaction = _session.CurrentTransaction;
AddIfNotAlreadyAdded("txnNumber", transaction.TransactionNumber);
if (transaction.State == CoreTransactionState.Starting)
{
AddIfNotAlreadyAdded("startTransaction", true);
var readConcern = ReadConcernHelper.GetReadConcernForFirstCommandInTransaction(_session, connectionDescription);
if (readConcern != null)
{
AddIfNotAlreadyAdded("readConcern", readConcern);
}
}
AddIfNotAlreadyAdded("autocommit", false);
}
if (_serverApi != null)
{
AddIfNotAlreadyAdded("apiVersion", _serverApi.Version.ToString());
if (_serverApi.Strict.HasValue)
{
AddIfNotAlreadyAdded("apiStrict", _serverApi.Strict.Value);
}
if (_serverApi.DeprecationErrors.HasValue)
{
AddIfNotAlreadyAdded("apiDeprecationErrors", _serverApi.DeprecationErrors.Value);
}
}
var elementAppendingSerializer = new ElementAppendingSerializer <BsonDocument>(BsonDocumentSerializer.Instance, extraElements, writerSettingsConfigurator);
return(new Type0CommandMessageSection <BsonDocument>(_command, elementAppendingSerializer));
void AddIfNotAlreadyAdded(string key, BsonValue value)
{
if (!_command.Contains(key))
{
extraElements.Add(new BsonElement(key, value));
}
}
bool IsSessionAcknowledged()
{
if (_command.TryGetValue("writeConcern", out var writeConcernDocument))
{
var writeConcern = WriteConcern.FromBsonDocument(writeConcernDocument.AsBsonDocument);
return(writeConcern.IsAcknowledged);
}
else
{
return(true);
}
}
}
public static List <BsonElement> _elements <TDocument>(this ElementAppendingSerializer <TDocument> instance)
{
var fieldInfo = typeof(ElementAppendingSerializer <TDocument>).GetField("_elements", BindingFlags.NonPublic | BindingFlags.Instance);
return((List <BsonElement>)fieldInfo.GetValue(instance));
}
private BsonDocument WrapCommandForQueryMessage(BsonDocument command, ConnectionDescription connectionDescription, out bool messageContainsSessionId, out bool secondaryOk)
{
messageContainsSessionId = false;
var extraElements = new List <BsonElement>();
if (_session.Id != null)
{
var areSessionsSupported = connectionDescription.IsMasterResult.LogicalSessionTimeout.HasValue;
if (areSessionsSupported)
{
var lsid = new BsonElement("lsid", _session.Id);
extraElements.Add(lsid);
messageContainsSessionId = true;
}
else
{
if (!_session.IsImplicit)
{
throw new MongoClientException("Sessions are not supported.");
}
}
}
if (_serverApi != null)
{
extraElements.Add(new BsonElement("apiVersion", _serverApi.Version.ToString()));
if (_serverApi.Strict.HasValue)
{
extraElements.Add(new BsonElement("apiStrict", _serverApi.Strict.Value));
}
if (_serverApi.DeprecationErrors.HasValue)
{
extraElements.Add(new BsonElement("apiDeprecationErrors", _serverApi.DeprecationErrors.Value));
}
}
if (_session.ClusterTime != null)
{
var clusterTime = new BsonElement("$clusterTime", _session.ClusterTime);
extraElements.Add(clusterTime);
}
#pragma warning disable 618
Action <BsonWriterSettings> writerSettingsConfigurator = null;
if (BsonDefaults.GuidRepresentationMode == GuidRepresentationMode.V2)
{
writerSettingsConfigurator = s => s.GuidRepresentation = GuidRepresentation.Unspecified;
}
#pragma warning restore 618
var appendExtraElementsSerializer = new ElementAppendingSerializer <BsonDocument>(BsonDocumentSerializer.Instance, extraElements, writerSettingsConfigurator);
var commandWithExtraElements = new BsonDocumentWrapper(command, appendExtraElementsSerializer);
var serverType = connectionDescription != null ? connectionDescription.IsMasterResult.ServerType : ServerType.Unknown;
var readPreferenceDocument = QueryHelper.CreateReadPreferenceDocument(serverType, _readPreference, out secondaryOk);
var wrappedCommand = new BsonDocument
{
{ "$query", commandWithExtraElements },
{ "$readPreference", readPreferenceDocument, readPreferenceDocument != null }
};
if (_additionalOptions != null)
{
wrappedCommand.Merge(_additionalOptions, overwriteExistingElements: false);
}
if (wrappedCommand.ElementCount == 1)
{
return(wrappedCommand["$query"].AsBsonDocument);
}
else
{
return(wrappedCommand);
}
}