Module: Labkit::HTTPClientPublisher

Defined in:
lib/labkit/httpclient_publisher.rb

Overview

Prepend to HTTPClient class to publish an ActiveSupport::Notifcation whenever a HTTP request is triggered.

Similar to Net::HTTP, this HTTP client redirects all calls to HTTPClient#do_get_block. HTTPClient is prepended with HTTPClientPublisher. Although HTTPClient supports request filter (a kind of middleware), its support is strictly limited. The request and response passed into the filter don’t contain connection information. The response doesn’t even contain any link to the request object. It’s impossible to fit this filter mechanism into our subscribing model.

For more information; github.com/nahi/httpclient/blob/d3091b095a1b29f65f4531a70a8e581e75be035e/lib/httpclient.rb#L1233

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.labkit_prepend! ⇒ Object 



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# File 'lib/labkit/httpclient_publisher.rb', line 21

def self.labkit_prepend!
  @prepend_mutex.synchronize do
    return if !defined?(HTTPClient) || @prepended

    HTTPClient.prepend(self)
    @prepended = true
  end
end

Instance Method Details

#do_get_block(req, proxy, conn, &block) ⇒ Object 



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# File 'lib/labkit/httpclient_publisher.rb', line 30

def do_get_block(req, proxy, conn, &block)
  start_time = ::Labkit::System.monotonic_time
  ActiveSupport::Notifications.instrument ::Labkit::EXTERNAL_HTTP_NOTIFICATION_TOPIC, create_request_payload(req, proxy) do |payload|
    response =
      begin
        super
      ensure
        payload[:duration] = (::Labkit::System.monotonic_time - start_time).to_f
      end
    payload[:code] = response.status_code.to_s
    response
  end
end