Class: Fme::Api::FaradayFollowNextLinks

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/fme/api/faraday_follow_next_links.rb

Constant Summary collapse

ENV_TO_CLEAR = 
%i[status response response_headers].to_set.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, max_pages = nil) ⇒ FaradayFollowNextLinks

Returns a new instance of FaradayFollowNextLinks.



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 9

def initialize(app, max_pages = nil)
  super(app)
  @max_pages = max_pages
end

Instance Attribute Details

#max_pages ⇒ Object (readonly)

Returns the value of attribute max_pages.



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 7

def max_pages
  @max_pages
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 14

def call(env)
  @app.call(env) && return unless :get == env[:method]
  perform_with_next_links(env, max_pages)
end

#handle_response(env, request_body, response_env, max_pages_left) ⇒ Object 



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 35

def handle_response(env, request_body, response_env, max_pages_left)
  return unless env[:body].is_a?(Array)
  new_request_env = update_env(response_env.dup, request_body, next_link(env))
  max_pages_left -= 1 unless max_pages_left.nil?
  env[:body] += perform_with_next_links(new_request_env, max_pages_left).body
end

#next_link(env) ⇒ Object 



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 31

def next_link(env)
  env.response.headers.fetch('x-link-next', nil)
end

#perform_with_next_links(env, max_pages_left) ⇒ Object 



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 19

def perform_with_next_links(env, max_pages_left)
  request_body = env[:body]
  response = @app.call(env)
  response.on_complete do |response_env|
    if next_link(env).present?
      raise FaradayMiddleware::RedirectLimitReached, response if max_pages_left == 0
      handle_response(env, request_body, response_env, max_pages_left)
    end
  end
  response
end

#update_env(env, request_body, next_link) ⇒ Object 



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# File 'lib/fme/api/faraday_follow_next_links.rb', line 42

def update_env(env, request_body, next_link)
  env[:url] = URI.parse(next_link)
  env[:body] = request_body
  ENV_TO_CLEAR.each { |key| env.delete key }
  env
end