Module: LVS::JsonService::Request::ClassMethods

Defined in:
lib/lvs/json_service/request.rb

Instance Method Summary collapse

Instance Method Details

#http_request_with_timeout(service, args, options) ⇒ Object 



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# File 'lib/lvs/json_service/request.rb', line 14

def http_request_with_timeout(service, args, options)
  uri = URI.parse(service)

  req = Net::HTTP::Post.new(uri.path)
  req.form_data = { "object_request" => args.to_json }

  options[:encrypted] ||= require_ssl?
  retries = options[:retries] || 0
  hard_retries = 1 # For persistent connection failures

  begin
    retries -= 1
            
    http = LVS::JsonService::ConnectionManager.get_connection(uri.host, uri.port, options)
    response = http.request(req)
  
  rescue Errno::EPIPE, EOFError, Errno::ECONNRESET
    hard_retries -= 1
    if hard_retries >= 0
      sleep(1)
      LVS::JsonService::ConnectionManager.reset_connection(uri.host, uri.port, options)
      retry
    end
  
  rescue Timeout::Error => e
    if retries >= 0
      LVS::JsonService::Logger.debug(
        "Retrying #{service} due to TimeoutError"
      )
      retry
    end
    raise LVS::JsonService::TimeoutError.new("Backend failed to respond in time", 500, service, args)
            
  rescue Errno::ECONNREFUSED => e
    if retries >= 0
      LVS::JsonService::Logger.debug(
        "Retrying #{service} due to Errno::ECONNREFUSED"
      )
      sleep(1)  
      retry
    end
    raise LVS::JsonService::BackendUnavailableError.new("Backend unavailable", 500, service, args)
    
  rescue OpenSSL::SSL::SSLError => e
    raise LVS::JsonService::BackendUnavailableError.new("Backend unavailable #{e}", 500, service, args)
    
  end

  if response.is_a?(Net::HTTPNotFound)
    raise LVS::JsonService::NotFoundError.new("404 Found for the service", 404, service, args)
  end

  if response.is_a?(Net::HTTPNotModified)
    raise LVS::JsonService::NotModified.new("304 Data hasn't changed", 304, service, args)
  end

  response
end

#run_remote_request(service, args, options = {}) ⇒ Object 



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# File 'lib/lvs/json_service/request.rb', line 73

def run_remote_request(service, args, options = {})
  LVS::JsonService::Logger.debug "Requesting '#{service}' with #{args.to_json}"
  
  if options[:cached_for]
    timing = "CACHED"
    response, result = Rails.cache.fetch([service, args].cache_key, :expires_in => options[:cached_for]) do
      start = Time.now
      response = http_request_with_timeout(service, args, options)
      net_timing = ("%.1f" % ((Time.now - start) * 1000)) + "ms"
      start = Time.now
      result = JSON.parse(response.body)
      parse_timing = ("%.1f" % ((Time.now - start) * 1000)) + "ms"
      timing = "Net: #{net_timing}, Parse: #{parse_timing}"
      [response, result]
    end
  else
    start = Time.now
    response = http_request_with_timeout(service, args, options)
    net_timing = ("%.1f" % ((Time.now - start) * 1000)) + "ms"
    start = Time.now
    result = JSON.parse(response.body)
    parse_timing = ("%.1f" % ((Time.now - start) * 1000)) + "ms"
    timing = "Net: #{net_timing}, Parse: #{parse_timing}"
  end

  if response.body.size < 1024 || options[:debug]
    LVS::JsonService::Logger.debug "Response (#{timing}): #{response.body.gsub(/\n/, '')}"
  else
    LVS::JsonService::Logger.debug "Response Snippet (#{timing} / #{"%.1f" % (response.body.size/1024)}kB): #{response.body.gsub(/\n/, '')[0..1024]}"
  end
  if result.is_a?(Hash) && result.has_key?("PCode")
    raise LVS::JsonService::Error.new(result["message"], result["PCode"], service, args, result)
  end
  result
end