class ClientWithStreamingSupport

This class subclasses Databasedotcom Client object and added steaming downloading and retryable authentication and retryable query.

Public Instance Methods

retryable_authenticate(options = {}) click to toggle source

This helper method is called whenever we need to initaialize the client object or whenever the client token expires. It will attempt 3 times with a 30 second delay between each retry. On the 3th try, if it fails the exception will be raised.

# File lib/logstash/inputs/elf-se/client_with_streaming_support.rb, line 33
def retryable_authenticate(options = {})
  1.upto(options[:retry_attempts]) do |count|
    begin
      # If exception is not thrown, then break out of loop.
      authenticate(username: options[:username], password: options[:password])
      break
    rescue StandardError => e
      # Sleep for 30 seconds 2 times. On the 3th time if it fails raise the exception without sleeping.
      if (count == options[:retry_attempts])
        raise e
      else
        sleep(30)
      end
    end
  end
end

retryable_query(options = {}) click to toggle source

# File lib/logstash/inputs/elf-se/client_with_streaming_support.rb, line 51
def retryable_query(options = {})
  query(options[:soql_expr])
rescue Databasedotcom::SalesForceError => e
  # Session has expired. Force user logout, then re-authenticate.
  if e.message == 'Session expired or invalid'
    retryable_authenticate(options)
  else
    raise e
  end
end

streaming_download(path, output_stream) click to toggle source

Constants LOG_KEY = 'SFDC - ClientWithStreamingSupport'

def initialize

@logger = Cabin::Channel.get(LogStash)

end

# File lib/logstash/inputs/elf-se/client_with_streaming_support.rb, line 14
def streaming_download(path, output_stream)
  connection = Net::HTTP.new(URI.parse(instance_url).host, 443)
  connection.use_ssl = true
  encoded_path = URI.escape(path)

  req = Net::HTTP::Get.new(encoded_path, 'Authorization' => "OAuth #{oauth_token}")
  connection.request(req) do |response|
    raise SalesForceError.new(response) unless response.is_a?(Net::HTTPSuccess)
    response.read_body do |chunk|
      output_stream.write chunk
    end
  end
end