Class: Jets::Processors::MainProcessor

Inherits:
Object
  • Object
show all
Defined in:
lib/jets/processors/main_processor.rb

Overview

Node shim calls this class to process both controllers and jobs

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(event, context, handler) ⇒ MainProcessor

Returns a new instance of MainProcessor.



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# File 'lib/jets/processors/main_processor.rb', line 7

def initialize(event, context, handler)
  @event = event
  @context = context
  @handler = handler
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/jets/processors/main_processor.rb', line 6

def context
  @context
end

#event ⇒ Object (readonly)

Returns the value of attribute event.



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# File 'lib/jets/processors/main_processor.rb', line 6

def event
  @event
end

#handler ⇒ Object (readonly)

Returns the value of attribute handler.



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# File 'lib/jets/processors/main_processor.rb', line 6

def handler
  @handler
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/jets/processors/main_processor.rb', line 13

def run
  # Use the handler to deduce app code to run.
  # Example handlers: handlers/controllers/posts.create, handlers/jobs/sleep.perform
  #
  #   deducer = Jets::Processors::Deducer.new("handlers/controllers/posts.create")
  #
  deducer = Jets::Processors::Deducer.new(handler)
  begin
    # Examples:
    #   deducer.code => PostsController.process(event, context, "show")
    #   deducer.path => app/controllers/posts_controller.rb
    #
    #   deducer.code => HardJob.process(event, context, "dig")
    #   deducer.path => app/jobs/hard_job.rb
    #
    #   deducer.code => HelloFunction.process(event, context, "world")
    #   deducer.path => app/functions/hello.rb
    deducer.load_class
    # result = PostsController.process(event, context, "create")
    result = instance_eval(deducer.code, deducer.path)
    result = HashWithIndifferentAccess.new(result) if result.is_a?(Hash)

    Jets.increase_call_count

    if result.is_a?(Hash) && result["headers"]
      # API Gateway is okay with the header values as Integers but
      # ELBs are more strict about this and require the header values to be Strings
      result["headers"]["x-jets-call-count"] = Jets.call_count.to_s
      result["headers"]["x-jets-prewarm-count"] = Jets.prewarm_count.to_s
    end

    result
  rescue Exception => e
    unless Jets.env.test?
      # Customize error message slightly so nodejs shim can process the
      # returned error message.
      # The "RubyError: " is a marker that the javascript shim scans for.
      $stderr.puts("RubyError: #{e.class}: #{e.message}") # js needs this as the first line
      backtrace = e.backtrace.map {|l| "  #{l}" }
      $stderr.puts(backtrace)
      # No need to having error in stderr above anymore because errors are handled in memory
      # at ruby_server.rb but keeping around for posterity.
    end

    Jets.on_exception(e)
    raise(e) # raise error to ruby_server.rb to rescue and handle
  end
end