private async Task <bool> Validate(
IStreamStore from,
IStreamStore to,
string branchId,
bool failOnNoStream = false)
{
await _messageQueue.UncompletedMessagesOnBranch(branchId).FirstAsync(s => s == 0)
.Timeout(Configuration.Timeout);
var page = await from.ListStreams();
while (page.StreamIds.Length > 0)
{
foreach (var s in page.StreamIds.Where(x => !x.StartsWith("$")))
{
var source = await from.GetStream(s, _serializer);
if (source.Timeline != branchId)
{
continue;
}
var target = await to.GetStream(s, _serializer);
if (target == null) // stream exists but some of the ancestors do not
{
return(false);
}
if (failOnNoStream && target.Version == ExpectedVersion.NoStream)
{
_log.Warn($"Stream {s} does not exist on target, probably due to missing ancestors", this);
return(false);
}
if (source.Version <= target.Version && source.Version > ExpectedVersion.EmptyStream)
{
var fromMessage = (await from.ReadStreamBackwards(s, StreamVersion.End, 1)).Messages.SingleOrDefault();
var toMessage = (await to.ReadStreamForwards(s, source.ReadPosition(source.Version), 1)).Messages.SingleOrDefault();
if (fromMessage.MessageId == toMessage.MessageId)
{
return(true);
}
_log.Warn(
$"Message doesn't match with remote for stream {s}@{source.Version} : " +
$"{fromMessage.MessageId} != {toMessage.MessageId}", this);
return(false);
}
var parent = source.Parent;
while (parent != null && parent.Version > ExpectedVersion.EmptyStream)
{
if (!await Validate(from, to, parent.Timeline, true))
{
return(false);
}
parent = parent.Parent;
}
}
page = await page.Next();
}
return(true);
}