/// <summary>
/// Calls <see cref="AzureServiceBus{TAuthenticationToken}.InstantiateReceiving()"/>
/// then uses a <see cref="Task"/> to apply the <see cref="FilterKey"/> as a <see cref="RuleDescription"/>
/// to the <see cref="SubscriptionClient"/> instances in <paramref name="serviceBusReceivers"/>.
/// </summary>
/// <param name="namespaceManager">The <see cref="NamespaceManager"/>.</param>
/// <param name="serviceBusReceivers">The receivers collection to place <see cref="SubscriptionClient"/> instances into.</param>
/// <param name="topicName">The topic name.</param>
/// <param name="topicSubscriptionName">The topic subscription name.</param>
protected override void InstantiateReceiving(NamespaceManager namespaceManager, IDictionary <int, SubscriptionClient> serviceBusReceivers, string topicName, string topicSubscriptionName)
{
base.InstantiateReceiving(namespaceManager, serviceBusReceivers, topicName, topicSubscriptionName);
Task.Factory.StartNewSafely
(() =>
{
// Because refreshing the rule can take a while, we only want to do this when the value changes
string filter;
if (!ConfigurationManager.TryGetSetting(FilterKeyConfigurationKey, out filter))
{
return;
}
if (FilterKey.ContainsKey(topicName) && FilterKey[topicName] == filter)
{
return;
}
FilterKey[topicName] = filter;
// https://docs.microsoft.com/en-us/azure/application-insights/app-insights-analytics-reference#summarize-operator
// http://www.summa.com/blog/business-blog/everything-you-need-to-know-about-azure-service-bus-brokered-messaging-part-2#rulesfiltersactions
// https://github.com/Azure-Samples/azure-servicebus-messaging-samples/tree/master/TopicFilters
SubscriptionClient client = serviceBusReceivers[0];
bool reAddRule = false;
try
{
IEnumerable <RuleDescription> rules = namespaceManager.GetRules(client.TopicPath, client.Name).ToList();
RuleDescription ruleDescription = rules.SingleOrDefault(rule => rule.Name == "CqrsConfiguredFilter");
if (ruleDescription != null)
{
var sqlFilter = ruleDescription.Filter as SqlFilter;
if (sqlFilter == null && !string.IsNullOrWhiteSpace(filter))
{
reAddRule = true;
}
else if (sqlFilter != null && sqlFilter.SqlExpression != filter)
{
reAddRule = true;
}
if (sqlFilter != null && reAddRule)
{
client.RemoveRule("CqrsConfiguredFilter");
}
}
else if (!string.IsNullOrWhiteSpace(filter))
{
reAddRule = true;
}
ruleDescription = rules.SingleOrDefault(rule => rule.Name == "$Default");
// If there is a default rule and we have a rule, it will cause issues
if (!string.IsNullOrWhiteSpace(filter) && ruleDescription != null)
{
client.RemoveRule("$Default");
}
// If we don't have a rule and there is no longer a default rule, it will cause issues
else if (string.IsNullOrWhiteSpace(filter) && !rules.Any())
{
ruleDescription = new RuleDescription
(
"$Default",
new SqlFilter("1=1")
);
client.AddRule(ruleDescription);
}
}
catch (MessagingEntityNotFoundException)
{
}
if (!reAddRule)
{
return;
}
int loopCounter = 0;
while (loopCounter < 10)
{
try
{
RuleDescription ruleDescription = new RuleDescription
(
"CqrsConfiguredFilter",
new SqlFilter(filter)
);
client.AddRule(ruleDescription);
break;
}
catch (MessagingEntityAlreadyExistsException exception)
{
loopCounter++;
// Still waiting for the delete to complete
Thread.Sleep(1000);
if (loopCounter == 9)
{
Logger.LogError("Setting the filter failed as it already exists.", exception: exception);
TelemetryHelper.TrackException(exception);
}
}
catch (Exception exception)
{
Logger.LogError("Setting the filter failed.", exception: exception);
TelemetryHelper.TrackException(exception);
break;
}
}
});
}
/// <summary>
/// Calls <see cref="AzureServiceBus{TAuthenticationToken}.InstantiateReceiving()"/>
/// then uses a <see cref="Task"/> to apply the <see cref="FilterKey"/> as a <see cref="RuleDescription"/>
/// to the <see cref="IMessageReceiver"/> instances in <paramref name="serviceBusReceivers"/>.
/// </summary>
/// <param name="manager">The <see cref="Manager"/>.</param>
/// <param name="serviceBusReceivers">The receivers collection to place <see cref="IMessageReceiver"/> instances into.</param>
/// <param name="topicName">The topic name.</param>
/// <param name="topicSubscriptionName">The topic subscription name.</param>
protected override void InstantiateReceiving(Manager manager, IDictionary <int, IMessageReceiver> serviceBusReceivers, string topicName, string topicSubscriptionName)
{
base.InstantiateReceiving(manager, serviceBusReceivers, topicName, topicSubscriptionName);
Task.Factory.StartNewSafely
(() =>
{
// Because refreshing the rule can take a while, we only want to do this when the value changes
string filter;
if (!ConfigurationManager.TryGetSetting(FilterKeyConfigurationKey, out filter))
{
return;
}
if (FilterKey.ContainsKey(topicName) && FilterKey[topicName] == filter)
{
return;
}
FilterKey[topicName] = filter;
// https://docs.microsoft.com/en-us/azure/application-insights/app-insights-analytics-reference#summarize-operator
// http://www.summa.com/blog/business-blog/everything-you-need-to-know-about-azure-service-bus-brokered-messaging-part-2#rulesfiltersactions
// https://github.com/Azure-Samples/azure-servicebus-messaging-samples/tree/master/TopicFilters
#if NET452
SubscriptionClient client = serviceBusReceivers[0];
#endif
#if NETSTANDARD2_0
// Since the IMessageReceiver and it's concrete implementation doesn't allow for the management of rules, we're creating a SubscriptionClient just to do the rules... it gets cleaned up somewhat below.
SubscriptionClient client = new SubscriptionClient(ConnectionString, topicName, topicSubscriptionName);
#endif
bool reAddRule = false;
try
{
#if NET452
IEnumerable <RuleDescription> rules = manager.GetRules(client.TopicPath, client.Name).ToList();
#endif
#if NETSTANDARD2_0
Task <IList <RuleDescription> > getRulesTask = manager.GetRulesAsync(client.TopicPath, client.SubscriptionName);
getRulesTask.Wait();
IEnumerable <RuleDescription> rules = getRulesTask.Result;
#endif
RuleDescription ruleDescription = rules.SingleOrDefault(rule => rule.Name == "CqrsConfiguredFilter");
if (ruleDescription != null)
{
var sqlFilter = ruleDescription.Filter as SqlFilter;
if (sqlFilter == null && !string.IsNullOrWhiteSpace(filter))
{
reAddRule = true;
}
else if (sqlFilter != null && sqlFilter.SqlExpression != filter)
{
reAddRule = true;
}
if (sqlFilter != null && reAddRule)
{
#if NET452
client.RemoveRule("CqrsConfiguredFilter");
#endif
#if NETSTANDARD2_0
client.RemoveRuleAsync("CqrsConfiguredFilter").Wait();
#endif
}
}
else if (!string.IsNullOrWhiteSpace(filter))
{
reAddRule = true;
}
ruleDescription = rules.SingleOrDefault(rule => rule.Name == "$Default");
// If there is a default rule and we have a rule, it will cause issues
if (!string.IsNullOrWhiteSpace(filter) && ruleDescription != null)
{
#if NET452
client.RemoveRule("$Default");
#endif
#if NETSTANDARD2_0
client.RemoveRuleAsync("$Default").Wait();
#endif
}
// If we don't have a rule and there is no longer a default rule, it will cause issues
else if (string.IsNullOrWhiteSpace(filter) && !rules.Any())
{
ruleDescription = new RuleDescription
(
"$Default",
new SqlFilter("1=1")
);
#if NET452
client.AddRule(ruleDescription);
#endif
#if NETSTANDARD2_0
client.AddRuleAsync(ruleDescription).Wait();
#endif
}
}
catch (AggregateException ex)
{
if (!(ex.InnerException is MessagingEntityNotFoundException))
{
throw;
}
}
catch (MessagingEntityNotFoundException)
{
}
if (!reAddRule)
{
return;
}
int loopCounter = 0;
while (loopCounter < 10)
{
try
{
RuleDescription ruleDescription = new RuleDescription
(
"CqrsConfiguredFilter",
new SqlFilter(filter)
);
#if NET452
client.AddRule(ruleDescription);
#endif
#if NETSTANDARD2_0
client.AddRuleAsync(ruleDescription).Wait();
#endif
break;
}
catch (MessagingEntityAlreadyExistsException exception)
{
loopCounter++;
// Still waiting for the delete to complete
Thread.Sleep(1000);
if (loopCounter == 9)
{
Logger.LogError("Setting the filter failed as it already exists.", exception: exception);
TelemetryHelper.TrackException(exception);
}
}
catch (Exception exception)
{
Logger.LogError("Setting the filter failed.", exception: exception);
TelemetryHelper.TrackException(exception);
break;
}
}
#if NETSTANDARD2_0
client.CloseAsync();
#endif
});
}