Module: Diffend::Request

Defined in:
lib/diffend/request.rb

Overview

Module responsible for doing request to Diffend

Constant Summary collapse

CONNECTION_MESSAGE =

Message displayed when connection issue occured and we will retry

'We experienced a connection issue, retrying...'
CONNECTION_EXCEPTIONS =

List of connection exceptions

[
  Errno::ECONNRESET,
  Errno::ENETUNREACH,
  Errno::EHOSTUNREACH,
  Errno::ECONNREFUSED,
  SocketError
].freeze
TIMEOUT_MESSAGE =

Message displayed when timeout occured and we will retry

'We experienced a connection issue, retrying...'
TIMEOUT_EXCEPTIONS =

List of timeout exceptions

[
  Net::OpenTimeout,
  Net::ReadTimeout
].freeze
SERVER_ERROR_MESSAGE =

Message displayed when server issue occured and we will retry

'We experienced a server-side issue, retrying...'
SERVER_ERRORS =

List of server issues

500 - Internal Server Error 502 - Bad Gateway 503 - Service Unavailable 504 - Gateway Timeout

[500, 502, 503, 504].freeze
RETRIES =

Number of retries

3

Class Method Summary collapse

Class Method Details

.assign_auth(request, config) ⇒ Object

Assigns basic authorization if provided in the config

Parameters:

  • request (Net::HTTP::Post) —

    prepared http post

  • config (Diffend::Config) 


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# File 'lib/diffend/request.rb', line 165

def assign_auth(request, config)
  return unless config.shareable_id
  return unless config.shareable_key

  request.basic_auth(config.shareable_id, config.shareable_key)
end

.assign_payload(request, payload) ⇒ Object

Assigns payload as json

Parameters:

  • request (Net::HTTP::Post) —

    prepared http post

  • payload (Hash) —

    with versions to check



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# File 'lib/diffend/request.rb', line 176

def assign_payload(request, payload)
  request.body = JSON.dump(payload: payload)
end

.build_http(url) ⇒ Object

Builds http connection object

Parameters:

  • url (String) —

    command endpoint url



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# File 'lib/diffend/request.rb', line 120

def build_http(url)
  uri = URI(url)

  Net::HTTP.start(
    uri.host,
    uri.port,
    use_ssl: uri.scheme == 'https',
    open_timeout: 15,
    read_timeout: 15
  ) { |http| yield(http, uri) }
end

.build_request(uri, request_method, config, payload) ⇒ Net::HTTP::Post, Net::HTTP::Put

Build http post request and assigns headers and payload

Parameters:

  • uri (URI::HTTPS)
  • request_method (Symbol)
  • config (Diffend::Config)
  • payload (Hash) —

    with versions to check

Returns:

  • (Net::HTTP::Post, Net::HTTP::Put) 


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# File 'lib/diffend/request.rb', line 140

def build_request(uri, request_method, config, payload)
  pick_request_method(request_method)
    .new(uri.request_uri, HEADERS)
    .tap { |request| assign_auth(request, config) }
    .tap { |request| assign_payload(request, payload) }
end

.call(request_object) ⇒ Net::HTTPResponse

Execute request

Parameters:

Returns:

  • (Net::HTTPResponse) —

    response from Diffend



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# File 'lib/diffend/request.rb', line 49

def call(request_object)
  retry_count ||= -1

  build_http(request_object.url) do |http, uri|
    response = http.request(
      build_request(
        uri,
        request_object.request_method,
        request_object.config,
        request_object.payload
      )
    )

    if SERVER_ERRORS.include?(response.code.to_i)
      raise Diffend::Errors::RequestServerError, response.code.to_i
    end

    response
  end
rescue Diffend::Errors::RequestServerError => e
  retry_count += 1

  retry if handle_retry(request_object.config, SERVER_ERROR_MESSAGE, retry_count)

  Diffend::HandleErrors::Report.call(
    exception: e,
    payload: request_object.payload,
    config: request_object.config,
    message: :request_error
  )
rescue *CONNECTION_EXCEPTIONS => e
  retry_count += 1

  retry if handle_retry(request_object.config, CONNECTION_MESSAGE, retry_count)

  Diffend::HandleErrors::Report.call(
    exception: e,
    payload: request_object.payload,
    config: request_object.config,
    message: :request_error
  )
rescue *TIMEOUT_EXCEPTIONS => e
  retry_count += 1

  retry if handle_retry(request_object.config, TIMEOUT_MESSAGE, retry_count)

  Diffend::HandleErrors::Report.call(
    exception: e,
    payload: request_object.payload,
    config: request_object.config,
    message: :request_error
  )
end

.exponential_backoff(retry_count) ⇒ Object 



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# File 'lib/diffend/request.rb', line 180

def exponential_backoff(retry_count)
  2**(retry_count + 1)
end

.handle_retry(config, message, retry_count) ⇒ Object

Handle retry

Parameters:

  • config (Diffend::Config)
  • message (String) —

    message we want to display

  • retry_count (Integer) 


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# File 'lib/diffend/request.rb', line 108

def handle_retry(config, message, retry_count)
  return false if retry_count == RETRIES

  config.logger.warn(message)
  sleep(exponential_backoff(retry_count))

  retry_count < RETRIES
end

.pick_request_method(request_method) ⇒ Net::HTTP::Post, Net::HTTP::Put

Pick request method

Parameters:

  • request_method (Symbol)

Returns:

  • (Net::HTTP::Post, Net::HTTP::Put) 


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# File 'lib/diffend/request.rb', line 152

def pick_request_method(request_method)
  case request_method
  when :post
    Net::HTTP::Post
  when :put
    Net::HTTP::Put
  end
end