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)
  # assume valid json from Lambda
  @event = JSON.parse(event)
  @context = JSON.parse(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 14

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 = instance_eval(deducer.code, deducer.path)
    # result = PostsController.process(event, context, "create")

    Jets.increase_call_count
    if result.is_a?(Hash) && result["headers"]
      result["headers"]["x-jets-call-count"] = Jets.call_count
      result["headers"]["x-jets-prewarm-count"] = Jets.prewarm_count
    end

    # Puts the return value of project code to stdout because this is
    # what eventually gets used by API Gateway.
    # Explicitly using $stdout since puts has been redirected to $stderr.
    #
    # JSON.dump is pretty robust.  If it cannot dump the structure into a
    # json string, it just dumps it to a plain text string.
    Jets::Util.normalize_result(result) # resp is a String
  rescue Exception => e
    # 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.

    raise # raise error to ruby_server.rb to rescue and handle

    # $stderr.puts("END OF RUBY OUTPUT") # uncomment for debugging
  end
end