private async Task OnApplicationMessageReceived(MqttApplicationMessageReceivedEventArgs eventArgs)
{
var application = ApplicationProvider.Current;
if (application?.RequestDelegate == null)
{
eventArgs.ProcessingFailed = true;
return;
}
using (var scope = ServiceScopeFactory.CreateScope())
{
var success = false;
var context = new MqttRequestContext(scope.ServiceProvider, eventArgs.ApplicationMessage, eventArgs.ClientId);
try
{
success = await application.RequestDelegate?.Invoke(context);
}
catch (Exception exc)
{
Logger.LogError(exc, $"Request failed to process: {exc.Message}");
}
eventArgs.ProcessingFailed = !success;
}
}
public static IMqttApplicationBuilder MapProcessor <TProcessor, TTopicParameters>(
this IMqttApplicationBuilder mqttApplicationBuilder,
string topicPattern,
Func <TTopicParameters, bool> parametersPredicate = null,
Action <ITopicBinderFactoryBuilder <TTopicParameters> > topicBinderFactoryBuilderConfigurator = null,
MqttQualityOfServiceLevel?qualityOfServiceLevel = null,
bool?noLocal = null,
bool?retainAsPublished = null,
MqttRetainHandling?retainHandling = null)
where TProcessor : IMqttRequestProcessor <TTopicParameters>
where TTopicParameters : class, new()
{
var topicBinder = CreateTopicBinder(topicPattern, topicBinderFactoryBuilderConfigurator);
return(mqttApplicationBuilder.Map(
topicPattern,
async context =>
{
if (topicBinder.IsMatch(context.Topic))
{
TTopicParameters parameters;
try
{
parameters = topicBinder.Bind(context.Topic);
}
catch
{
return false;
}
if (parametersPredicate?.Invoke(parameters) ?? true)
{
var parameterizedContext = new MqttRequestContext <TTopicParameters>(context, parameters);
var processor = context.ServiceProvider.GetRequiredService <TProcessor>();
return await processor.ProcessRequest(parameterizedContext);
}
}
return false;
},
qualityOfServiceLevel,
noLocal,
retainAsPublished,
retainHandling));
}
public static IMqttApplicationBuilder Map <TTopicParameters>(
this IMqttApplicationBuilder mqttApplicationBuilder,
string topicPattern,
MqttRequestDelegate <TTopicParameters> middleware,
Func <TTopicParameters, bool> parametersPredicate = null,
Action <ITopicBinderFactoryBuilder <TTopicParameters> > topicBinderFactoryBuilderConfigurator = null,
MqttQualityOfServiceLevel?qualityOfServiceLevel = null,
bool?noLocal = null,
bool?retainAsPublished = null,
MqttRetainHandling?retainHandling = null)
where TTopicParameters : class, new()
{
var topicBinder = CreateTopicBinder(topicPattern, topicBinderFactoryBuilderConfigurator);
return(mqttApplicationBuilder.Map(
topicPattern,
async context =>
{
if (topicBinder.IsMatch(context.Topic))
{
TTopicParameters parameters;
try
{
parameters = topicBinder.Bind(context.Topic);
}
catch
{
return false;
}
if (parametersPredicate?.Invoke(parameters) ?? true)
{
var ctx = new MqttRequestContext <TTopicParameters>(context, parameters);
return await middleware.Invoke(ctx);
}
}
return false;
},
qualityOfServiceLevel,
noLocal,
retainAsPublished,
retainHandling));
}
public MqttCommandContext(MqttRequestContext context, TEntity entity, TEntityDefinition entityDefinition)
{
Entity = entity;
EntityDefinition = entityDefinition;
ContentType = context.ContentType;
CorrelationData = context.CorrelationData;
MessageExpiryInterval = context.MessageExpiryInterval;
Payload = context.Payload;
PayloadFormatIndicator = context.PayloadFormatIndicator;
QualityOfServiceLevel = context.QualityOfServiceLevel;
ResponseTopic = context.ResponseTopic;
Retain = context.Retain;
SubscriptionIdentifiers = context.SubscriptionIdentifiers;
Topic = context.Topic;
TopicAlias = context.TopicAlias;
UserProperties = context.UserProperties;
ClientId = context.ClientId;
}
