private static unsafe string CombineHashesFromMultipleRanges(Dictionary <string, List <TimeSeriesRangeResult> > ranges)
{
// init hash
var size = Sodium.crypto_generichash_bytes();
Debug.Assert((int)size == 32);
var cryptoGenerichashStatebytes = (int)Sodium.crypto_generichash_statebytes();
var state = stackalloc byte[cryptoGenerichashStatebytes];
if (Sodium.crypto_generichash_init(state, null, UIntPtr.Zero, size) != 0)
{
ComputeHttpEtags.ThrowFailToInitHash();
}
ComputeHttpEtags.HashNumber(state, ranges.Count);
foreach (var kvp in ranges)
{
foreach (var range in kvp.Value)
{
ComputeHttpEtags.HashChangeVector(state, range.Hash);
}
}
return(ComputeHttpEtags.FinalizeHash(size, state));
}
internal static unsafe TimeSeriesRangeResult GetTimeSeriesRange(DocumentsOperationContext context, string docId, string name, DateTime from, DateTime to, ref int start, ref int pageSize)
{
if (pageSize == 0)
{
return(new TimeSeriesRangeResult());
}
List <TimeSeriesEntry> values = new List <TimeSeriesEntry>();
var reader = new TimeSeriesReader(context, docId, name, from, to, offset: null);
// init hash
var size = Sodium.crypto_generichash_bytes();
Debug.Assert((int)size == 32);
var cryptoGenerichashStatebytes = (int)Sodium.crypto_generichash_statebytes();
var state = stackalloc byte[cryptoGenerichashStatebytes];
if (Sodium.crypto_generichash_init(state, null, UIntPtr.Zero, size) != 0)
{
ComputeHttpEtags.ThrowFailToInitHash();
}
var oldStart = start;
var lastResult = true;
foreach (var(individualValues, segmentResult) in reader.SegmentsOrValues())
{
if (individualValues == null &&
start > segmentResult.Summary.Span[0].Count)
{
start -= segmentResult.Summary.Span[0].Count;
continue;
}
var enumerable = individualValues ?? segmentResult.Values;
foreach (var singleResult in enumerable)
{
if (start-- > 0)
{
continue;
}
if (pageSize-- <= 0)
{
lastResult = false;
break;
}
values.Add(new TimeSeriesEntry
{
Timestamp = singleResult.Timestamp,
Tag = singleResult.Tag,
Values = singleResult.Values.ToArray(),
IsRollup = singleResult.Type == SingleResultType.RolledUp
});
}
ComputeHttpEtags.HashChangeVector(state, segmentResult?.ChangeVector);
if (pageSize <= 0)
{
break;
}
}
if ((oldStart > 0) && (values.Count == 0))
{
return(new TimeSeriesRangeResult());
}
return(new TimeSeriesRangeResult
{
From = (oldStart > 0) ? values[0].Timestamp : from,
To = lastResult ? to : values.Last().Timestamp,
Entries = values.ToArray(),
Hash = ComputeHttpEtags.FinalizeHash(size, state)
});
}
internal static unsafe TimeSeriesRangeResult GetTimeSeriesRange(DocumentsOperationContext context, string docId, string name, DateTime from, DateTime to, ref int start, ref int pageSize)
{
if (pageSize == 0)
{
return(null);
}
List <TimeSeriesEntry> values = new List <TimeSeriesEntry>();
var reader = new TimeSeriesReader(context, docId, name, from, to, offset: null);
// init hash
var size = Sodium.crypto_generichash_bytes();
Debug.Assert((int)size == 32);
var cryptoGenerichashStatebytes = (int)Sodium.crypto_generichash_statebytes();
var state = stackalloc byte[cryptoGenerichashStatebytes];
if (Sodium.crypto_generichash_init(state, null, UIntPtr.Zero, size) != 0)
{
ComputeHttpEtags.ThrowFailToInitHash();
}
var initialStart = start;
var hasMore = false;
DateTime lastSeenEntry = from;
foreach (var(individualValues, segmentResult) in reader.SegmentsOrValues())
{
if (individualValues == null &&
start > segmentResult.Summary.NumberOfLiveEntries)
{
lastSeenEntry = segmentResult.End;
start -= segmentResult.Summary.NumberOfLiveEntries;
continue;
}
var enumerable = individualValues ?? segmentResult.Values;
foreach (var singleResult in enumerable)
{
lastSeenEntry = segmentResult.End;
if (start-- > 0)
{
continue;
}
if (pageSize-- <= 0)
{
hasMore = true;
break;
}
values.Add(new TimeSeriesEntry
{
Timestamp = singleResult.Timestamp,
Tag = singleResult.Tag,
Values = singleResult.Values.ToArray(),
IsRollup = singleResult.Type == SingleResultType.RolledUp
});
}
ComputeHttpEtags.HashChangeVector(state, segmentResult.ChangeVector);
if (pageSize <= 0)
{
break;
}
}
var hash = ComputeHttpEtags.FinalizeHash(size, state);
if ((initialStart > 0) && (values.Count == 0))
{
// this is a special case, because before the 'start' we might have values
return new TimeSeriesRangeResult
{
From = lastSeenEntry,
To = to,
Entries = values.ToArray(),
Hash = hash
}
}
;
return(new TimeSeriesRangeResult
{
From = (initialStart > 0) ? values[0].Timestamp : from,
To = hasMore ? values.Last().Timestamp : to,
Entries = values.ToArray(),
Hash = hash
});
}
