public IEnumerable<QueriedMetricResult> ExecuteQuery(Query query)
{
if (query.Metrics == null)
yield break;
lock(_sqliteEngineLock)
{
foreach (var metric in query.Metrics)
{
yield return
DatabaseQueries.GetMetricValuesBetweenDates(_db, metric, query.StartDate, query.EndDate,
query.Resolution);
}
}
}
public MetricsModule(IStorageEngine storageEngine)
: base("/metrics")
{
_storageEngine = storageEngine;
Get["/list"] = parameters =>
{
var metrics = _storageEngine.GetKnownMetrics();
return Response.AsJson(metrics.ToArray());
};
Get["/query"] = parameters =>
{
DateTime start, end;
DateTime.TryParse(Request.Query.start, out start);
if (!DateTime.TryParse(Request.Query.end, out end))
end = DateTime.MaxValue;
string rawMetrics = Convert.ToString(Request.Query.metric.Value);
var metrics = new Metric[0];
if (rawMetrics != null)
{
var splitRawMetrics = rawMetrics.Split(',');
metrics = splitRawMetrics.Select(Metric.Create).ToArray();
}
var query = new Query
{
StartDate = start,
EndDate = end,
Metrics = metrics
};
var results = _storageEngine.ExecuteQuery(query);
return Response.AsJson(results.ToArray());
};
}
public void Query_Results_Returned_As_Average_Per_Year()
{
const string device = "device";
const string category = "category";
const string name1 = "name1";
const string suffix = "suffix";
const decimal metricValue1 = 0m;
const decimal metricValue2 = 50m;
const decimal metricValue3 = 75m;
const decimal expectedAverage = (metricValue1 + metricValue2) / 2;
var metric1 = new Metric(device, category, name1, suffix);
var snapshot1 = new Snapshot
{
Date = new DateTime(2013, 5, 1, 0, 0, 0),
MetricValues = new[] { new KeyValuePair<Metric, decimal>(metric1, metricValue1) }
};
var snapshot2 = new Snapshot
{
Date = snapshot1.Date.AddMonths(6),
MetricValues = new[] { new KeyValuePair<Metric, decimal>(metric1, metricValue2) }
};
var snapshot3 = new Snapshot
{
Date = snapshot1.Date.AddMonths(12),
MetricValues = new[] { new KeyValuePair<Metric, decimal>(metric1, metricValue3) }
};
_storageEngine.StoreSnapshot(snapshot1);
_storageEngine.StoreSnapshot(snapshot2);
_storageEngine.StoreSnapshot(snapshot3);
var query = new Query
{
StartDate = snapshot1.Date.AddDays(-1),
EndDate = snapshot3.Date.AddDays(1),
Metrics = new[] { metric1 },
Resolution = QueryResolution.Year
};
var results = _storageEngine.ExecuteQuery(query);
var expectedDate1 = snapshot1.Date.AddMonths(-snapshot1.Date.Month + 1);
var expectedDate2 = snapshot3.Date.AddMonths(-snapshot3.Date.Month + 1);
Assert.IsNotNull(results, "Null results returned");
var resultsArray = results.ToArray();
Assert.AreEqual(1, resultsArray.Length, "Incorrect number of results were returned");
Assert.AreEqual(metric1, resultsArray[0].Metric, "Returned metric was not correct");
Assert.IsNotNull(resultsArray[0].Values, "Returned metric values array was null");
Assert.AreEqual(2, resultsArray[0].Values.Length, "Incorrect number of metric values returned");
Assert.AreEqual(expectedDate1, resultsArray[0].Values[0].Key, "Incorrect metric date for first result");
Assert.AreEqual(expectedAverage, resultsArray[0].Values[0].Value, "Incorrect metric value for first result");
Assert.AreEqual(expectedDate2, resultsArray[0].Values[1].Key, "Incorrect metric date for second result");
Assert.AreEqual(metricValue3, resultsArray[0].Values[1].Value, "Incorrect metric value for second result");
}
public void Multiple_Values_Returned_In_Order_Of_Snapshot_Date()
{
const string device = "device";
const string category = "category";
const string name1 = "name1";
const string suffix = "suffix";
const decimal metricValue1 = 123.4m;
const decimal metricValue2 = 50m;
var metric1 = new Metric(device, category, name1, suffix);
var snapshot1 = new Snapshot
{
Date = DateTime.Now.ToComparableDateTime(),
MetricValues = new KeyValuePair<Metric, decimal>[]
{
new KeyValuePair<Metric, decimal>(metric1, metricValue1),
}
};
var snapshot2 = new Snapshot
{
Date = DateTime.Now.AddMinutes(-5).ToComparableDateTime(),
MetricValues = new KeyValuePair<Metric, decimal>[]
{
new KeyValuePair<Metric, decimal>(metric1, metricValue2),
}
};
_storageEngine.StoreSnapshot(snapshot1);
_storageEngine.StoreSnapshot(snapshot2);
var query = new Query
{
StartDate = snapshot2.Date.AddMinutes(-1),
EndDate = snapshot1.Date.AddMinutes(1),
Metrics = new[] { metric1 }
};
var results = _storageEngine.ExecuteQuery(query);
Assert.IsNotNull(results, "Null results returned");
var resultsArray = results.ToArray();
Assert.AreEqual(1, resultsArray.Length, "Incorrect number of results were returned");
Assert.AreEqual(metric1, resultsArray[0].Metric, "Returned metric was not correct");
Assert.IsNotNull(resultsArray[0].Values, "Returned metric values array was null");
Assert.AreEqual(2, resultsArray[0].Values.Length, "Incorrect number of metric values returned");
Assert.AreEqual(snapshot2.Date, resultsArray[0].Values[0].Key, "Incorrect metric date for first result");
Assert.AreEqual(metricValue2, resultsArray[0].Values[0].Value, "Incorrect metric value for first result");
Assert.AreEqual(snapshot1.Date, resultsArray[0].Values[1].Key, "Incorrect metric date for second result");
Assert.AreEqual(metricValue1, resultsArray[0].Values[1].Value, "Incorrect metric value for second result");
}