private static bool TryParseDoubleField(ReadOnlySpan <byte> corpus, out double value, out int bytesConsumed)
{
BackendMetricsTokenizer.TokenType equalsDelimiterToken = BackendMetricsTokenizer.Read(corpus);
if (equalsDelimiterToken != BackendMetricsTokenizer.TokenType.EqualDelimiter)
{
value = default;
bytesConsumed = default;
return(false);
}
corpus = corpus.Slice(1);
if (!Utf8Parser.TryParse(corpus, out value, out bytesConsumed))
{
value = default;
return(false);
}
bytesConsumed++;
return(true);
}
private static bool TryParseTimeSpanField(ReadOnlySpan <byte> corpus, out TimeSpan timeSpan, out int bytesConsumed)
{
BackendMetricsTokenizer.TokenType equalsDelimiterToken = BackendMetricsTokenizer.Read(corpus);
if (equalsDelimiterToken != BackendMetricsTokenizer.TokenType.EqualDelimiter)
{
timeSpan = default;
bytesConsumed = default;
return(false);
}
corpus = corpus.Slice(1);
if (!Utf8Parser.TryParse(corpus, out double milliseconds, out bytesConsumed))
{
timeSpan = default;
return(false);
}
// Can not use TimeSpan.FromMilliseconds since double has a loss of precision
timeSpan = TimeSpan.FromTicks((long)(TimeSpan.TicksPerMillisecond * milliseconds));
bytesConsumed++;
return(true);
}
public static unsafe bool TryParse(string deliminatedString, out BackendMetrics backendMetrics)
{
if (deliminatedString == null)
{
throw new ArgumentNullException(nameof(deliminatedString));
}
if (deliminatedString.Length == 0)
{
// Stack allocating a zero length buffer returns a null pointer
// so we special case the zero length string.
backendMetrics = BackendMetrics.Empty;
return(true);
}
// QueryMetrics
long retrievedDocumentCount = default;
long retrievedDocumentSize = default;
long outputDocumentCount = default;
long outputDocumentSize = default;
double indexHitRatio = default;
TimeSpan totalQueryExecutionTime = default;
// QueryPreparationTimes
TimeSpan queryCompilationTime = default;
TimeSpan logicalPlanBuildTime = default;
TimeSpan physicalPlanBuildTime = default;
TimeSpan queryOptimizationTime = default;
// QueryTimes
TimeSpan indexLookupTime = default;
TimeSpan documentLoadTime = default;
TimeSpan vmExecutionTime = default;
TimeSpan documentWriteTime = default;
// RuntimeExecutionTimes
TimeSpan systemFunctionExecutionTime = default;
TimeSpan userDefinedFunctionExecutionTime = default;
const int MaxStackAlloc = 4 * 1024;
int corpusLengthInBytes = deliminatedString.Length * 4;
ReadOnlySpan <byte> corpus = (corpusLengthInBytes <= MaxStackAlloc) ? stackalloc byte[corpusLengthInBytes] : new byte[corpusLengthInBytes];
fixed(char *deliminatedStringPointer = deliminatedString)
{
fixed(byte *corpusPointer = corpus)
{
int bytesEncoded = Encoding.UTF8.GetBytes(deliminatedStringPointer, deliminatedString.Length, corpusPointer, corpus.Length);
corpus = corpus.Slice(0, bytesEncoded);
}
}
while (!corpus.IsEmpty)
{
BackendMetricsTokenizer.TokenType token = BackendMetricsTokenizer.Read(corpus);
int bytesConsumed;
switch (token)
{
case BackendMetricsTokenizer.TokenType.DocumentLoadTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.DocumentLoadTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out documentLoadTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.DocumentWriteTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.DocumentWriteTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out documentWriteTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.IndexLookupTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.IndexLookupTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out indexLookupTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.IndexHitRatio:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.IndexHitRatio.Length);
if (!BackendMetricsParser.TryParseDoubleField(corpus, out indexHitRatio, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.LogicalPlanBuildTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.LogicalPlanBuildTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out logicalPlanBuildTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.OutputDocumentCount:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.OutputDocumentCount.Length);
if (!BackendMetricsParser.TryParseLongField(corpus, out outputDocumentCount, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.OutputDocumentSize:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.OutputDocumentSize.Length);
if (!BackendMetricsParser.TryParseLongField(corpus, out outputDocumentSize, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.PhysicalPlanBuildTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.PhysicalPlanBuildTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out physicalPlanBuildTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.QueryCompileTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.QueryCompileTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out queryCompilationTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.QueryOptimizationTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.QueryOptimizationTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out queryOptimizationTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.RetrievedDocumentCount:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.RetrievedDocumentCount.Length);
if (!BackendMetricsParser.TryParseLongField(corpus, out retrievedDocumentCount, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.RetrievedDocumentSize:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.RetrievedDocumentSize.Length);
if (!BackendMetricsParser.TryParseLongField(corpus, out retrievedDocumentSize, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.SystemFunctionExecuteTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.SystemFunctionExecuteTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out systemFunctionExecutionTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.TotalQueryExecutionTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.TotalQueryExecutionTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out totalQueryExecutionTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.UserDefinedFunctionExecutionTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.UserDefinedFunctionExecutionTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out userDefinedFunctionExecutionTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.VMExecutionTimeInMs:
corpus = corpus.Slice(BackendMetricsTokenizer.TokenBuffers.VMExecutionTimeInMs.Length);
if (!BackendMetricsParser.TryParseTimeSpanField(corpus, out vmExecutionTime, out bytesConsumed))
{
backendMetrics = default;
return(false);
}
break;
case BackendMetricsTokenizer.TokenType.Unknown:
// If the token is unknown, then just skip till the next field (';' or EOF)
// since the token must have been added recently in the service and the newer SDKs should know how to parse it
// this avoids breaking old clients
int nextTokenIndex = corpus.IndexOf((byte)';');
if (nextTokenIndex == -1)
{
// The next token does not exist, so just seek to the end
bytesConsumed = corpus.Length;
}
else
{
bytesConsumed = nextTokenIndex;
}
break;
default:
backendMetrics = default;
return(false);
}
corpus = corpus.Slice(bytesConsumed);
if (!corpus.IsEmpty)
{
BackendMetricsTokenizer.TokenType semicolonToken = BackendMetricsTokenizer.Read(corpus);
if (semicolonToken != BackendMetricsTokenizer.TokenType.SemiColonDelimiter)
{
backendMetrics = default;
return(false);
}
corpus = corpus.Slice(1);
}
}
backendMetrics = new BackendMetrics(
retrievedDocumentCount: retrievedDocumentCount,
retrievedDocumentSize: retrievedDocumentSize,
outputDocumentCount: outputDocumentCount,
outputDocumentSize: outputDocumentSize,
indexHitRatio: indexHitRatio,
totalQueryExecutionTime: totalQueryExecutionTime,
queryPreparationTimes: new QueryPreparationTimes(
queryCompilationTime: queryCompilationTime,
logicalPlanBuildTime: logicalPlanBuildTime,
physicalPlanBuildTime: physicalPlanBuildTime,
queryOptimizationTime: queryOptimizationTime),
indexLookupTime: indexLookupTime,
documentLoadTime: documentLoadTime,
vmExecutionTime: vmExecutionTime,
runtimeExecutionTimes: new RuntimeExecutionTimes(
queryEngineExecutionTime: vmExecutionTime - indexLookupTime - documentLoadTime - documentWriteTime,
systemFunctionExecutionTime: systemFunctionExecutionTime,
userDefinedFunctionExecutionTime: userDefinedFunctionExecutionTime),
documentWriteTime: documentWriteTime);
return(true);
}
