Class: Treblle

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

Overview

Treblle middleware for request interception and gathering.

Constant Summary collapse

TREBLLE_URI = 
'https://rocknrolla.treblle.com'
TREBLLE_VERSION = 
'0.6'

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Treblle

Returns a new instance of Treblle.



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# File 'lib/treblle.rb', line 12

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/treblle.rb', line 16

def call(env)
  request = ActionDispatch::Request.new(env)
  started_at = Time.now

  begin
    status, headers, response = @app.call(env)
    to_parse = response.clone
    to_parse = to_parse.try(:body) if to_parse.respond_to?(:body)

    begin
      json_response = JSON.parse(to_parse)
    rescue JSON::ParserError, TypeError
      # continue with original values when unable to parse reponse to json
      return [status, headers, response]
    end

    params = {
      ended_at: Time.now,
      env: env,
      headers: headers,
      json_response: json_response,
      request: request,
      started_at: started_at,
      status: status
    }
    capture(params)
  rescue Exception => e
    status = status_code_for_exception(e)
    params = {
      ended_at: Time.now,
      env: env,
      exception: e,
      headers: headers,
      request: request,
      started_at: started_at,
      status: status
    }
    # send error payload to treblle, but raise exception as well
    capture(params)
    raise e
  end

  [status, headers, response]
end

#capture(params) ⇒ Object

Creates data to send in a format that Treblle expects and does the sending in a new thread for perfomance reasons.

Parameters:

  • params (Object) 


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# File 'lib/treblle.rb', line 64

def capture(params)
  data = DataBuilder.new(params).call
  return if data&.bytesize.to_i > 2.megabytes # ignore the capture for unnaturally large requests

  Thread.new do
    send_to_treblle(data)
  end
rescue Exception => e
  Rails.logger.error(e.message)
end

#send_to_treblle(data) ⇒ Object 



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# File 'lib/treblle.rb', line 75

def send_to_treblle(data)
  uri = URI(TREBLLE_URI)
  req = Net::HTTP::Post.new(uri)
  req['Content-Type'] = 'application/json'
  req['x-api-key'] = ENV.fetch('TREBLLE_API_KEY') { '' }
  req.body = data
  puts data
  res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
    http.request(req)
  end
  puts res.try(:body)
end

#status_code_for_exception(exception) ⇒ Object 



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# File 'lib/treblle.rb', line 88

def status_code_for_exception(exception)
  exception_wrapper = ActionDispatch::ExceptionWrapper.new(nil, exception)
  exception_wrapper.status_code
rescue
  500
end