/// <summary>
/// The Service Manifest can specify a label with value <c>[AppParamName]</c>, in which case we replace it
/// with the value of an application parameter with the given name <c>AppParamName</c>.
/// Application parameter names are case insensitive in Service Fabric.
/// If no such app param exists, we replace with empty string.
/// </summary>
private void ApplyAppParamReplacements(Dictionary <string, string> labels, ApplicationWrapper app, ServiceWrapper service)
{
var replacements = new List <KeyValuePair <string, string> >();
foreach (var label in labels)
{
var value = label.Value;
if (value.Length > 2 && value[0] == '[' && value[value.Length - 1] == ']')
{
var appParamName = value.Substring(1, value.Length - 2);
if (app.ApplicationParameters == null ||
!app.ApplicationParameters.TryGetValue(appParamName, out var appParamValue))
{
// TODO: This should trigger a Warning or Error health report on the faulty service.
// This is not critical because if the absence of the setting leads to invalid configs, we *do* already report error
// (for example, if a route's rule were missing).
Log.InvalidApplicationParameter(_logger, app.ApplicationName, app.ApplicationTypeName, app.ApplicationTypeVersion, service.ServiceName, label.Key, appParamName);
appParamValue = string.Empty;
}
replacements.Add(KeyValuePair.Create(label.Key, appParamValue));
}
}
foreach (var replacement in replacements)
{
labels[replacement.Key] = replacement.Value;
}
}
/// <inheritdoc/>
public async Task <Dictionary <string, string> > GetExtensionLabelsAsync(ApplicationWrapper application, ServiceWrapper service, CancellationToken cancellationToken)
{
_ = application ?? throw new ArgumentNullException(nameof(application));
_ = service ?? throw new ArgumentNullException(nameof(service));
_ = application.ApplicationTypeName ?? throw new ArgumentNullException($"{nameof(application)}.{nameof(application.ApplicationTypeName)}");
_ = application.ApplicationTypeVersion ?? throw new ArgumentNullException($"{nameof(application)}.{nameof(application.ApplicationTypeVersion)}");
_ = service.ServiceTypeName ?? throw new ArgumentNullException($"{nameof(service)}.{nameof(service.ServiceTypeName)}");
_ = service.ServiceName ?? throw new ArgumentNullException($"{nameof(service)}.{nameof(service.ServiceName)}");
string serviceManifestName;
try
{
serviceManifestName = await _serviceFabricCaller.GetServiceManifestName(application.ApplicationTypeName, application.ApplicationTypeVersion, service.ServiceTypeName, cancellationToken);
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
throw;
}
catch (Exception ex) // TODO: davidni: not fatal?
{
throw new ServiceFabricIntegrationException($"Failed to get service manifest name for service type {service.ServiceTypeName} of application type {application.ApplicationTypeName} {application.ApplicationTypeVersion} from Service Fabric: {ex}.");
}
if (serviceManifestName == null)
{
throw new ServiceFabricIntegrationException($"No service manifest name was found for service type {service.ServiceTypeName} of application type {application.ApplicationTypeName} {application.ApplicationTypeVersion}.");
}
string rawServiceManifest;
try
{
rawServiceManifest = await _serviceFabricCaller.GetServiceManifestAsync(application.ApplicationTypeName, application.ApplicationTypeVersion, serviceManifestName, cancellationToken);
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
throw;
}
catch (Exception ex) // TODO: davidni: not fatal?
{
throw new ServiceFabricIntegrationException($"Failed to get service manifest {serviceManifestName} of service type {service.ServiceTypeName} of application type {application.ApplicationTypeName} {application.ApplicationTypeVersion} from Service Fabric: {ex}.");
}
if (rawServiceManifest == null)
{
throw new ServiceFabricIntegrationException($"No service manifest named '{serviceManifestName}' was found for service type {service.ServiceTypeName} of application type {application.ApplicationTypeName} {application.ApplicationTypeVersion}.");
}
// TODO: gathering labels from multiple servicetypes within the same service would result in multiple
// calls to the SF client and multiple XML parses. We should consider creating an instance of this class
// per application type to reuse that data. Since this is uncommon, for now we follow the na�ve implementation.
var result = ExtractLabels(rawServiceManifest, service.ServiceTypeName);
ApplyAppParamReplacements(result, application, service);
if (result.GetValueOrDefault("YARP.EnableDynamicOverrides", null)?.ToLower() == "true")
{
// Override with properties
IDictionary <string, string> properties;
try
{
properties = await _serviceFabricCaller.EnumeratePropertiesAsync(service.ServiceName, cancellationToken);
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
throw;
}
catch (Exception ex)
{
throw new ServiceFabricIntegrationException($"Failed to get properties for {service.ServiceName}.", ex);
}
OverrideLabels(ref result, properties);
}
return(result);
}