// Alternate method for getting metrics by passing in the definitions
public async Task <MetricListResponse> GetMetricsAsync(
string resourceUri, string filterString, IEnumerable <MetricDefinition> definitions, CancellationToken cancellationToken)
{
if (definitions == null)
{
throw new ArgumentNullException("definitions");
}
if (resourceUri == null)
{
throw new ArgumentNullException("resourceUri");
}
// Remove any '/' characters from the start since these are handled by the hydra (thin) client
// Don't encode Uri segments here since this will mess up the SAS retrievers (they use the resourceUri directly)
resourceUri = resourceUri.TrimStart('/');
MetricListResponse result;
string invocationId = TracingAdapter.NextInvocationId.ToString(CultureInfo.InvariantCulture);
// If no definitions provided, return empty collection
if (!definitions.Any())
{
this.LogStartGetMetrics(invocationId, resourceUri, filterString, definitions);
result = new MetricListResponse()
{
RequestId = Guid.NewGuid().ToString("D"),
StatusCode = HttpStatusCode.OK,
MetricCollection = new MetricCollection()
{
Value = new Metric[0]
}
};
this.LogEndGetMetrics(invocationId, result);
return(result);
}
// Parse MetricFilter
MetricFilter filter = MetricFilterExpressionParser.Parse(filterString);
// Names in filter must match the names in the definitions
if (filter.DimensionFilters != null && filter.DimensionFilters.Any())
{
IEnumerable <string> filterNames = filter.DimensionFilters.Select(df => df.Name);
IEnumerable <string> definitionNames = definitions.Select(d => d.Name.Value);
IEnumerable <string> filterOnly = filterNames.Where(fn => !definitionNames.Contains(fn, StringComparer.InvariantCultureIgnoreCase));
IEnumerable <string> definitionOnly = definitionNames.Where(df => !filterNames.Contains(df, StringComparer.InvariantCultureIgnoreCase));
if (filterOnly.Any() || definitionOnly.Any())
{
throw new ArgumentException("Set of names specified in filter string must match set of names in provided definitions", "filterString");
}
// "Filter out" metrics with unsupported dimensions
definitions = definitions.Where(d => SupportsRequestedDimensions(d, filter));
}
else
{
filter = new MetricFilter()
{
TimeGrain = filter.TimeGrain,
StartTime = filter.StartTime,
EndTime = filter.EndTime,
DimensionFilters = definitions.Select(d => new MetricDimension()
{
Name = d.Name.Value
})
};
}
// Parse out provider name and determine if provider is storage
string providerName = this.GetProviderFromResourceId(resourceUri);
bool isStorageProvider =
string.Equals(providerName, "Microsoft.Storage", StringComparison.OrdinalIgnoreCase) ||
string.Equals(providerName, "Microsoft.ClassicStorage", StringComparison.OrdinalIgnoreCase);
// Create supported MetricRetrievers
IMetricRetriever proxyRetriever = new ProxyMetricRetriever(this);
IMetricRetriever shoeboxRetriever = new ShoeboxMetricRetriever();
IMetricRetriever storageRetriever = new StorageMetricRetriever();
IMetricRetriever blobShoeboxMetricRetriever = new BlobShoeboxMetricRetriever();
IMetricRetriever emptyRetriever = EmptyMetricRetriever.Instance;
// Create the selector function here so it has access to the retrievers, filter, and providerName
Func <MetricDefinition, IMetricRetriever> retrieverSelector = (d) =>
{
if (!d.MetricAvailabilities.Any())
{
return(emptyRetriever);
}
if (isStorageProvider)
{
return(storageRetriever);
}
if (IsBlobSasMetric(d, filter.TimeGrain))
{
return(blobShoeboxMetricRetriever);
}
if (IsTableSasMetric(d, filter.TimeGrain))
{
return(shoeboxRetriever);
}
return(proxyRetriever);
};
// Group definitions by retriever so we can make one request to each retriever
IEnumerable <IGrouping <IMetricRetriever, MetricDefinition> > groups = definitions.GroupBy(retrieverSelector);
// Get Metrics from each retriever (group)
IEnumerable <Task <MetricListResponse> > locationTasks = groups.Select(g =>
g.Key.GetMetricsAsync(resourceUri, GetFilterStringForDefinitions(filter, g), g, invocationId));
// Aggregate metrics from all groups
this.LogStartGetMetrics(invocationId, resourceUri, filterString, definitions);
MetricListResponse[] results = (await Task.Factory.ContinueWhenAll(locationTasks.ToArray(), tasks => tasks.Select(t => t.Result))).ToArray();
IEnumerable <Metric> metrics = results.Aggregate <MetricListResponse, IEnumerable <Metric> >(
new List <Metric>(), (list, response) => list.Union(response.MetricCollection.Value));
this.LogMetricCountFromResponses(invocationId, metrics.Count());
// Fill in values (resourceUri, displayName, unit) from definitions
CompleteShoeboxMetrics(metrics, definitions, resourceUri);
// Add empty objects for metrics that had no values come back, ensuring a metric is returned for each definition
IEnumerable <Metric> emptyMetrics = (await emptyRetriever.GetMetricsAsync(
resourceUri,
filterString,
definitions.Where(d => !metrics.Any(m => string.Equals(m.Name.Value, d.Name.Value, StringComparison.OrdinalIgnoreCase))),
invocationId)).MetricCollection.Value;
// Create response (merge and wrap metrics)
result = new MetricListResponse()
{
RequestId = Guid.NewGuid().ToString("D"),
StatusCode = HttpStatusCode.OK,
MetricCollection = new MetricCollection()
{
Value = metrics.Union(emptyMetrics).ToList()
}
};
this.LogEndGetMetrics(invocationId, result);
return(result);
}
private void ProcessMetricRequests()
{
_logger.Debug("Beginning to process metric requests");
var storageEngine = new SqliteStorageEngine(ApplicationSettings.DatabaseName);
// Start the webserver
_logger.Debug("Beginning webserver on port {0}", _webPortNumber);
var bootstrapper = new OverlookBootStrapper(storageEngine);
var uri = new Uri("http://localhost:" + _webPortNumber);
var webServer = new NancyHost(uri, bootstrapper);
webServer.Start();
_logger.Debug("Web server started");
var retrievers = new IMetricRetriever[]
{
new OpenProcessMetricRetriever(),
new OpenHardwareMonitorMetricRetriever()
};
UpdateDisplays(storageEngine);
var lastSnapshotTime = DateTime.MinValue;
var secondsBetweenChecks = ApplicationSettings.SecondsBetweenSnapshots;
while (!_cancellationTokenSource.Token.IsCancellationRequested)
{
if ((DateTime.Now - lastSnapshotTime).TotalSeconds > secondsBetweenChecks)
{
_logger.Debug("Generating snapshot");
var snapshot = new Snapshot
{
Date = DateTime.Now,
MetricValues = retrievers.SelectMany(x => x.GetCurrentMetricValues())
.ToArray()
};
_logger.Debug("Storing Snapshot");
storageEngine.StoreSnapshot(snapshot);
_logger.Debug("Snapshot stored");
UpdateDisplays(storageEngine);
lastSnapshotTime = DateTime.Now;
}
else
{
Thread.Sleep(100);
}
}
_logger.Debug("Stopping webserver");
webServer.Stop();
_logger.Debug("Webserver stopped");
}
