Class: LogStash::Outputs::AzureEventHubs

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/outputs/azure_event_hubs.rb

Overview

Output plugin to send events to an Azure Event Hub.

Instance Method Summary collapse

Instance Method Details

#close ⇒ Object 



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# File 'lib/logstash/outputs/azure_event_hubs.rb', line 137

def close
  @eventhub_client.closeSync();
  @executor_service.shutdown();
end

#receive(event) ⇒ Object 



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# File 'lib/logstash/outputs/azure_event_hubs.rb', line 143

def receive(event)
  begin
    @codec.encode(event)
  rescue => e
    @logger.warn("Error encoding event", :exception => e, :event => event)
  end
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/azure_event_hubs.rb', line 78

def register
  # Build Event Hubs client connection string

  connection_builder = ConnectionStringBuilder.new()
  connection_builder.setNamespaceName(@service_namespace)
  connection_builder.setEventHubName(@event_hub)
  connection_builder.setSasKeyName(@sas_key_name)
  connection_builder.setSasKey(@sas_key)

  # Configure for national cloud

  if (!@service_domain.nil?)
    connection_builder.setEndpoint(@service_namespace, @service_domain)
  end

  # The Executor handles all the asynchronous tasks and this is passed to the EventHubClient.

  # The gives the user control to segregate their thread pool based on the work load.

  # This pool can then be shared across multiple EventHubClient instances.

  @executor_service = Executors.newScheduledThreadPool(@client_threads)

  # Handle Transient errors when creating the Event Hubs Client

  try = 0
  retry_interval = 2
  begin
    # Each EventHubClient instance spins up a new TCP/SSL connection, which is expensive.

    # It is always a best practice to reuse these instances.

    @eventhub_client = EventHubClient.createSync(connection_builder.toString(), @executor_service)

  rescue EventHubException, ExecutionException, InterruptedException, IOException => e
    # Log error, no retry

    if e.getIsTransient() != true or e == IOException or try >= @connection_retry_count
      @logger.error(
        "Unable to establish connection to Azure Event Hubs.",
        :error_message => e.getMessage(),
        :class => e.class.name
        )
      close()
      exit(1)
    end

    # Log error with retry

    @logger.error(
      "Connection to Event Hubs failed, will attempt connection again.",
      :error_message => e.getMessage(),
      :class => e.class.name,
      :retry_in_seconds => retry_interval
    )

    # Wait for interval

    sleep(retry_interval)
    
    # Add attempt and retry

    try += 1
    retry
  end

  # Pass event to sender on encode 

  @codec.on_event(&method(:send_record))
end