Class: LambdaRunner::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/lambda_runner.rb

Overview

abstract for running the program

Instance Method Summary collapse

Constructor Details

#initialize(module_path, name, port = 8897) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/lambda_runner.rb', line 11

def initialize(module_path, name, port = 8897)
  @module_path = module_path
  @name = name
  @port = port
end

Instance Method Details

#add_aws_sdk ⇒ Object 



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# File 'lib/lambda_runner.rb', line 25

def add_aws_sdk
  STDOUT.puts("Copying aws-sdk into the lambda function's node_modules.")
  FileUtils.cp_r File.expand_path('../../js/node_modules/aws-sdk', __FILE__), "#{File.dirname(@module_path)}/node_modules"
end

#install_deps ⇒ Object 



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# File 'lib/lambda_runner.rb', line 17

def install_deps
  @npm_cwd = File.expand_path('../../js/', __FILE__)
  STDOUT.puts("trying to use npm install in #{@npm_cwd}")
  npm_install_pid = spawn('npm', 'install', chdir: @npm_cwd)
  Process.wait(npm_install_pid)
  fail 'failed to install the lambda startup' if ($CHILD_STATUS.exitstatus != 0)
end

#process_event(event, context = {}) ⇒ Object 



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# File 'lib/lambda_runner.rb', line 51

def process_event(event, context = {})
  payload = JSON.generate({ event: event, context: context })
  id = RestClient.post(url, payload, content_type: :json).to_str
  loop do
    response = RestClient.get(url, params: { id: id }) {|response, request, res| response}
    data = JSON.parse('['+response.body+']').first

    case response.code
    when 200 then sleep(0.1)
    when 201 then return data
    when 500 then fail data
    when 502 then fail data
    when 504 then fail 'timeout'
    else fail "unknown response #{response.code}"
    end
  end
end

#start(opts = { cover: true }) ⇒ Object 



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# File 'lib/lambda_runner.rb', line 30

def start(opts = { cover: true })
  if opts[:timeout] == nil
    opts[:timeout] = '30000'
  end
  install_deps
  #copy over aws sdk only if it is not already there
  if !File.directory?("#{File.dirname(@module_path)}/node_modules/aws-sdk")
    add_aws_sdk
  end
  # start node in a way that emulates how it's run in production
  cmd = ['node']
  cmd = [File.join(@npm_cwd, 'node_modules/.bin/istanbul'), 'cover', '--root', File.dirname(@module_path), '--'] if opts[:cover]
  cmd += [File.join(@npm_cwd, 'startup.js'), '-p', @port.to_s, '-m', @module_path, '-h', @name, '-t', opts[:timeout]]
  @proc = ProcessHelper::ProcessHelper.new(print_lines: true)
  @proc.start(cmd, 'Server running at http')
end

#stop ⇒ Object 



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# File 'lib/lambda_runner.rb', line 69

def stop
  RestClient.delete(url)
end

#url ⇒ Object 



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# File 'lib/lambda_runner.rb', line 47

def url
  "http://localhost:#{@port}/"
end