internal IAsyncEnumerable <DocumentSnapshot> StreamAsync(ByteString transactionId, CancellationToken cancellationToken) => StreamResponsesAsync(transactionId, cancellationToken) .Where(resp => resp.Document != null) .Select(resp => DocumentSnapshot.ForDocument(Database, resp.Document, Timestamp.FromProto(resp.ReadTime)));
internal async Task <QuerySnapshot> SnapshotAsync(ByteString transactionId, CancellationToken cancellationToken)
{
var responses = StreamResponsesAsync(transactionId, cancellationToken);
Timestamp?readTime = null;
List <DocumentSnapshot> snapshots = new List <DocumentSnapshot>();
await responses.ForEachAsync(response =>
{
if (response.Document != null)
{
snapshots.Add(DocumentSnapshot.ForDocument(Database, response.Document, Timestamp.FromProto(response.ReadTime)));
}
if (readTime == null && response.ReadTime != null)
{
readTime = Timestamp.FromProto(response.ReadTime);
}
}, cancellationToken).ConfigureAwait(false);
GaxPreconditions.CheckState(readTime != null, "The stream returned from RunQuery did not provide a read timestamp.");
return(new QuerySnapshot(this, snapshots.AsReadOnly(), readTime.Value));
}
internal static WriteResult FromProto(V1Beta1.WriteResult result, wkt::Timestamp commitTime)
{
GaxPreconditions.CheckNotNull(result, nameof(result));
GaxPreconditions.CheckNotNull(commitTime, nameof(commitTime));
return(new WriteResult(Timestamp.FromProto(result.UpdateTime ?? commitTime)));
}
/// <summary>
/// Creates a precondition that the document has the specified last update time.
/// </summary>
public static Precondition LastUpdated(Timestamp timestamp) =>
new Precondition(new V1Beta1.Precondition {
UpdateTime = timestamp.ToProto()
});
private WriteResult(Timestamp updateTime)
{
UpdateTime = updateTime;
}