private static byte[] GetSha256Hash(PutRequest request)
{
byte[] hash;
using (var sha256 = SHA256.Create())
{
hash = sha256.ComputeHash(request.Bytes);
}
return hash;
}
private PutResult[] PutInternal(PutRequest[] valuesToAdd, int backupIndex)
{
var results = new PutResult[valuesToAdd.Length];
var groupedByEndpoint = from req in valuesToAdd
let er = new
{
OriginalIndex = Array.IndexOf(valuesToAdd, req),
Put = new ExtendedPutRequest
{
Bytes = req.Bytes,
ExpiresAt = req.ExpiresAt,
IsReadOnly = req.IsReadOnly,
Key = req.Key,
OptimisticConcurrency = req.OptimisticConcurrency,
ParentVersions = req.ParentVersions,
Segment = GetSegmentFromKey(req.Key),
}
}
group er by GetEndpointByBackupIndex(topology.Segments[er.Put.Segment], backupIndex) into g
select g;
foreach (var endpoint in groupedByEndpoint)
{
if (endpoint.Key == null)
throw new NoMoreBackupsException();
var requests = endpoint.ToArray();
var putRequests = requests.Select(x => x.Put).ToArray();
var putsResults = GetPutsResults(endpoint.Key, putRequests, backupIndex);
for (var i = 0; i < putsResults.Length; i++)
{
results[requests[i].OriginalIndex] = putsResults[i];
}
}
return results;
}
public PutResult Put(PutRequest request)
{
var hash = GetSha256Hash(request);
var versions = GatherActiveVersions(request.Key);
if (versions.Length == 1)
{
// Test that the key doesn't already exist with matching value
var values = Get(new GetRequest { Key = request.Key, SpecifiedVersion = versions[0] });
if (values.Length == 1 && values[0].Sha256Hash.SequenceEqual(hash))
{
return new PutResult
{
ConflictExists = false,
Version = versions[0]
};
}
}
// we always accept read only put requests, because
// we assume that there can never be a conflict with them
// since they are read only values.
var doesAllVersionsMatch =
request.IsReadOnly ?
request.IsReadOnly :
DoesAllVersionsMatch(request.Key, request.ParentVersions);
if (doesAllVersionsMatch == false &&
request.OptimisticConcurrency)
{
return new PutResult
{
ConflictExists = true,
Version = null
};
}
// always remove the active versions from the cache
commitSyncronization.Add(() => cache.Remove(GetKey(request.Key)));
if (doesAllVersionsMatch)
{
// we only remove existing versions from the
// cache if we delete them from the database
foreach (var parentVersion in versions)
{
var copy = parentVersion;
commitSyncronization.Add(() => cache.Remove(GetKey(request.Key, copy)));
}
DeleteAllKeyValuesForVersions(request.Key, versions);
}
var instanceIdForRow = instanceId;
if (request.ReplicationVersion != null)
instanceIdForRow = request.ReplicationVersion.InstanceId;
int versionNumber = request.ReplicationVersion == null ?
GenerateVersionNumber() :
request.ReplicationVersion.Number;
using (var update = new Update(session, keys, JET_prep.Insert))
{
Api.SetColumn(session, keys, keysColumns["key"], request.Key, Encoding.Unicode);
Api.SetColumn(session, keys, keysColumns["version_instance_id"], instanceIdForRow.ToByteArray());
Api.SetColumn(session, keys, keysColumns["version_number"], versionNumber);
if (request.ExpiresAt.HasValue)
Api.SetColumn(session, keys, keysColumns["expiresAt"], request.ExpiresAt.Value.ToOADate());
update.Save();
}
using (var update = new Update(session, data, JET_prep.Insert))
{
Api.SetColumn(session, data, dataColumns["key"], request.Key, Encoding.Unicode);
Api.SetColumn(session, data, dataColumns["version_number"], versionNumber);
Api.SetColumn(session, data, dataColumns["version_instance_id"], instanceIdForRow.ToByteArray());
Api.SetColumn(session, data, dataColumns["data"], request.Bytes);
Api.SetColumn(session, data, dataColumns["sha256_hash"], hash);
Api.SetColumn(session, data, dataColumns["readonly"], request.IsReadOnly);
var timestamp = DateTime.Now.ToOADate();
if (request.ReplicationTimeStamp.HasValue)
timestamp = request.ReplicationTimeStamp.Value.ToOADate();
Api.SetColumn(session, data, dataColumns["timestamp"], timestamp);
if (request.ExpiresAt.HasValue)
Api.SetColumn(session, data, dataColumns["expiresAt"], request.ExpiresAt.Value.ToOADate());
WriteAllParentVersions(request.ParentVersions);
update.Save();
}
return new PutResult
{
ConflictExists = doesAllVersionsMatch == false,
Version = new ValueVersion
{
InstanceId = instanceIdForRow,
Number = versionNumber
}
};
}
