connection pooling

connection_pooling.rb

require 'faraday'
class ConnectionPool
  # See https://github.com/mperham/connection_pool
  def initialize(pool_size: 8, pool_timeout: 5, **connection_config)
    @connections = ConnectionPool.new(size: pool_size, timeout: pool_timeout) do
      create_connection(**connection_config)
    end
  end

  def connection(&block)
    @connections.with(&block)
  end

  def create_connection(timeout:, max_retries:, retry_interval:,
                        backoff_factor:, retry_statuses:, retry_methods:,
                        cache: false, verify: true)
    Faraday.new do |faraday|
      faraday.use Faraday::HttpCache, serializer: Marshal if cache
      faraday.use FaradayMiddleware::FollowRedirects
      faraday.use :gzip
      faraday.request :multipart
      faraday.request :url_encoded
      faraday.ssl[:ca_file] = Certifi.where
      faraday.ssl[:verify] = verify
      faraday.request :retry, max: max_retries, interval: retry_interval,
                              backoff_factor: backoff_factor,
                              retry_statuses: retry_statuses,
                              methods: retry_methods
      faraday.adapter Faraday.default_adapter
      faraday.options[:params_encoder] = Faraday::FlatParamsEncoder
      faraday.options[:timeout] = timeout if timeout.positive?
    end
  end
end