/// <summary>
/// Allows to forcefully initialize the endpoint if it hasn't been initialized yet.
/// </summary>
/// <param name="executionContext">The execution context.</param>
/// <param name="token">The cancellation token or default cancellation token.</param>
private async Task InitializeEndpointIfNecessary(FunctionExecutionContext executionContext, CancellationToken token = default)
{
if (pipeline == null)
{
await semaphoreLock.WaitAsync(token).ConfigureAwait(false);
try
{
if (pipeline == null)
{
LogManager.GetLogger("Previews").Info(
"NServiceBus.AzureFunctions.ServiceBus is a preview package. Preview packages are licensed separately from the rest of the Particular Software platform and have different support guarantees. You can view the license at https://particular.net/eula/previews and the support policy at https://docs.particular.net/previews/support-policy. Customer adoption drives whether NServiceBus.AzureFunctions.ServiceBus will be incorporated into the Particular Software platform. Let us know you are using it, if you haven't already, by emailing us at [email protected].");
endpoint = await endpointFactory(executionContext).ConfigureAwait(false);
pipeline = configuration.PipelineInvoker;
hackForLearning = configuration.HackForLearning;
}
}
finally
{
semaphoreLock.Release();
}
}
}
private async Task InitializeEndpointUsedOutsideHandlerIfNecessary(ExecutionContext executionContext, ILogger functionsLogger)
{
FunctionsLoggerFactory.Instance.SetCurrentLogger(functionsLogger);
var functionExecutionContext = new FunctionExecutionContext(executionContext, functionsLogger);
await InitializeEndpointIfNecessary(functionExecutionContext).ConfigureAwait(false);
}
/// <summary>
/// Processes a message received from an AzureStorageQueue trigger using the NServiceBus message pipeline.
/// </summary>
public async Task Process(CloudQueueMessage message, ExecutionContext executionContext, ILogger functionsLogger = null)
{
FunctionsLoggerFactory.Instance.SetCurrentLogger(functionsLogger);
MessageWrapper wrapper;
// Read message content via StreamReader to handle BOM correctly.
using (var memoryStream = new MemoryStream(message.AsBytes))
using (var reader = new StreamReader(memoryStream))
{
wrapper = JsonSerializer.Deserialize <MessageWrapper>(new JsonTextReader(reader));
}
var messageContext = CreateMessageContext(wrapper);
var functionExecutionContext = new FunctionExecutionContext(executionContext, functionsLogger);
await InitializeEndpointIfNecessary(functionExecutionContext).ConfigureAwait(false);
try
{
await pipeline.PushMessage(messageContext).ConfigureAwait(false);
}
catch (Exception exception)
{
var errorContext = new ErrorContext(
exception,
wrapper.GetHeaders(),
messageContext.MessageId,
messageContext.Body,
new TransportTransaction(),
message.DequeueCount);
var errorHandleResult = await pipeline.PushFailedMessage(errorContext).ConfigureAwait(false);
if (errorHandleResult == ErrorHandleResult.Handled)
{
// return to signal to the Functions host it can complete the incoming message
return;
}
throw;
}
MessageContext CreateMessageContext(MessageWrapper originalMessage)
{
return(new MessageContext(
originalMessage.GetMessageId(),
originalMessage.GetHeaders(),
originalMessage.Body,
new TransportTransaction(),
new CancellationTokenSource(),
new ContextBag()));
}
}
/// <summary>
/// Processes a message received from an AzureServiceBus trigger using the NServiceBus message pipeline.
/// </summary>
public async Task Process(Message message, ExecutionContext executionContext, ILogger functionsLogger = null)
{
FunctionsLoggerFactory.Instance.SetCurrentLogger(functionsLogger);
var messageContext = CreateMessageContext(message);
var functionExecutionContext = new FunctionExecutionContext(executionContext, functionsLogger);
await InitializeEndpointIfNecessary(functionExecutionContext,
messageContext.ReceiveCancellationTokenSource.Token).ConfigureAwait(false);
try
{
await pipeline.PushMessage(messageContext).ConfigureAwait(false);
}
catch (Exception exception)
{
var errorContext = new ErrorContext(
exception,
message.GetHeaders(),
messageContext.MessageId,
messageContext.Body,
new TransportTransaction(),
message.SystemProperties.DeliveryCount);
var errorHandleResult = await pipeline.PushFailedMessage(errorContext).ConfigureAwait(false);
if (errorHandleResult == ErrorHandleResult.Handled)
{
// return to signal to the Functions host it can complete the incoming message
return;
}
throw;
}
MessageContext CreateMessageContext(Message originalMessage)
{
return(new MessageContext(
originalMessage.GetMessageId(),
originalMessage.GetHeaders(),
originalMessage.Body,
new TransportTransaction(),
new CancellationTokenSource(),
new ContextBag()));
}
}
internal async Task InitializeEndpointIfNecessary(ExecutionContext executionContext, ILogger logger, CancellationToken cancellationToken)
{
if (pipeline == null)
{
await semaphoreLock.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (pipeline == null)
{
var functionExecutionContext = new FunctionExecutionContext(executionContext, logger);
endpoint = await endpointFactory(functionExecutionContext).ConfigureAwait(false);
pipeline = configuration.PipelineInvoker;
}
}
finally
{
semaphoreLock.Release();
}
}
}