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Fixing "sequence contains no elements" when querying storage #2015

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Fixing "sequence contains no elements" when querying storage #2015

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26 changes: 16 additions & 10 deletions src/ResourceManagement/Insights/Insights/Customizations/Shoebox/SasMetricRetriever.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,18 +23,24 @@ public async Task<MetricListResponse> GetMetricsAsync(string resourceId, string
{
MetricFilter filter = MetricFilterExpressionParser.Parse(filterString);

// Filter definitions by timegrain
var timegraindefinitions = from d in definitions
where d.MetricAvailabilities.Count > 0
&& d.MetricAvailabilities[0].TimeGrain == filter.TimeGrain
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@davmc davmc Jul 19, 2016

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This will not work for metrics with multiple allowed timegrains, for which the query specifies one other than the first. It needs to be able to select the appropriate availability based on the requested timegrain.

select d;

// Group definitions by location so we can make one request to each location
Dictionary<MetricAvailability, MetricFilter> groups =
definitions.GroupBy(d => d.MetricAvailabilities.First(a => a.TimeGrain == filter.TimeGrain),
new SasMetricRetriever.AvailabilityComparer()).ToDictionary(g => g.Key, g => new MetricFilter()
{
TimeGrain = filter.TimeGrain,
StartTime = filter.StartTime,
EndTime = filter.EndTime,
DimensionFilters = g.Select(d =>
filter.DimensionFilters.FirstOrDefault(df => string.Equals(df.Name, d.Name.Value, StringComparison.OrdinalIgnoreCase))
?? new MetricDimension() {Name = d.Name.Value})
});
timegraindefinitions.GroupBy(d => d.MetricAvailabilities[0]).ToDictionary(g => g.Key, g => new MetricFilter()
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@davmc davmc Jul 19, 2016

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To be safe, this call to GroupBy should include the EqualityComaparer for the Availability objects (SasMetricRetriever.AvailabilityComparer).

{
TimeGrain = filter.TimeGrain,
StartTime = filter.StartTime,
EndTime = filter.EndTime,
DimensionFilters = g.Select(d =>
filter.DimensionFilters.FirstOrDefault(df => string.Equals(df.Name, d.Name.Value, StringComparison.OrdinalIgnoreCase))
?? new MetricDimension() {Name = d.Name.Value})
});


// Verify all groups represent shoebox metrics
if (groups.Any(g => g.Key.Location == null))
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