Fix 90 day data collection for Azure Service Bus

src/AppCommon/Commands/AzureServiceBusCommand.cs

@@ -1,11 +1,16 @@
 using System.CommandLine;
+using Azure.Monitor.Query.Metrics.Models;
 using Particular.EndpointThroughputCounter.Infra;
 using Particular.LicensingComponent.Report;
 using Particular.ThroughputQuery;
 using Particular.ThroughputQuery.AzureServiceBus;
 
 class AzureServiceBusCommand : BaseCommand
 {
+    // ASB keeps 90 days of data but will only return 30 days in a single query
+    const int MaxDaysToCollect = 90;
+    const int MaxDaysToCollectInOneQuery = 30;
+
     public static Command CreateCommand()
     {
         var command = new Command("azureservicebus", "Measure endpoints and throughput using Azure Service Bus metrics");
@@ -54,12 +59,17 @@ public static Command CreateCommand()
             var cancellationToken = context.GetCancellationToken();
 
 #if DEBUG
+            // So we don't have to keep an Azure Service Bus resource id and region in launchSettings.json
+            // Create a local.settings.json file with the keys below.
             if (resourceId == "LOAD_FROM_CONFIG")
             {
-                // So we don't have to keep an Azure Service Bus resource id in launchSettings.json
-                // Create a local.settings.json file with the key below.
                 resourceId = AppConfig.Get<string>("AZURESERVICEBUS_RESOURCE_ID");
             }
+
+            if (region == "LOAD_FROM_CONFIG")
+            {
+                region = AppConfig.Get<string>("AZURESERVICEBUS_REGION");
+            }
 #endif
 
             var runner = new AzureServiceBusCommand(shared, resourceId, serviceBusDomain, region, metricsDomain);
@@ -85,7 +95,7 @@ protected override async Task<QueueDetails> GetData(CancellationToken cancellati
         try
         {
             var endTime = DateOnly.FromDateTime(DateTime.UtcNow);
-            var startTime = endTime.AddDays(-90); // Azure Monitor only gives a data for a month back, but we ask for more just in case
+            var startTime = endTime.AddDays(-MaxDaysToCollect);
             var results = new List<QueueThroughput>();
 
             azure.ResetConnectionQueue();
@@ -97,7 +107,7 @@ protected override async Task<QueueDetails> GetData(CancellationToken cancellati
 
                 Out.Write($"Gathering metrics for queue {i + 1}/{queueNames.Length}: {queueName}");
 
-                var metricValues = (await azure.GetMetrics(queueName, startTime, endTime, cancellationToken)).OrderBy(m => m.TimeStamp).ToArray();
+                var metricValues = await GetMetricValues(queueName, startTime, endTime, cancellationToken);
 
                 var maxThroughput = metricValues.Select(timeEntry => timeEntry.Total).Max();
                 var start = DateOnly.FromDateTime(metricValues.First().TimeStamp.UtcDateTime);
@@ -159,6 +169,18 @@ protected override async Task<QueueDetails> GetData(CancellationToken cancellati
         }
     }
 
+    async Task<MetricValue[]> GetMetricValues(string queueName, DateOnly start, DateOnly end, CancellationToken cancellationToken)
+    {
+        var metricValues = new List<MetricValue>();
+
+        foreach (var (startTime, endTime) in ReportingWindow.GetReportingWindow(start, end, MaxDaysToCollectInOneQuery))
+        {
+            metricValues.AddRange(await azure.GetMetrics(queueName, startTime, endTime, cancellationToken));
+        }
+
+        return [.. metricValues.OrderBy(x => x.TimeStamp)];
+    }
+
     protected override async Task<EnvironmentDetails> GetEnvironment(CancellationToken cancellationToken = default)
     {
         Out.WriteLine($"Getting data from {azure.FullyQualifiedNamespace}...");

src/AppCommon/Infra/ReportingWindow.cs

@@ -0,0 +1,17 @@
+public static class ReportingWindow
+{
+    public static IEnumerable<(DateOnly Start, DateOnly End)> GetReportingWindow(DateOnly startDate, DateOnly endDate, int maxDaysPerPeriod)
+    {
+        DateOnly currentStart = startDate;
+        while (currentStart <= endDate)
+        {
+            DateOnly currentEnd = currentStart.AddDays(maxDaysPerPeriod);
+            if (currentEnd > endDate)
+            {
+                currentEnd = endDate;
+            }
+            yield return (currentStart, currentEnd);
+            currentStart = currentEnd.AddDays(1);
+        }
+    }
+}

src/Tool/Properties/launchSettings.json

@@ -30,7 +30,7 @@
     },
     "ThroughputTool-ASB": {
       "commandName": "Project",
-      "commandLineArgs": "azureservicebus --resourceId LOAD_FROM_CONFIG --queueNameMasks Samples --customerName \"Particular Software\" --unattended",
+      "commandLineArgs": "azureservicebus --resourceId LOAD_FROM_CONFIG --region LOAD_FROM_CONFIG --queueNameMasks Samples --customerName \"Particular Software\" --unattended",
       "environmentVariables": {
         "IS_DEVELOPMENT": "true"
       }