Class: HTMLProofer::Cache

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/html-proofer/cache.rb

Constant Summary collapse

DEFAULT_STORAGE_DIR = 
File.join('tmp', '.htmlproofer')
DEFAULT_CACHE_FILE_NAME = 
'cache.log'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

clean_content, create_nokogiri, #pluralize, swap

Constructor Details

#initialize(logger, options) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/html-proofer/cache.rb', line 19

def initialize(logger, options)
  @logger = logger
  @cache_log = {}

  if options.nil? || options.empty?
    define_singleton_method('use_cache?') { false }
  else
    define_singleton_method('use_cache?') { true }
    setup_cache!(options)
    @parsed_timeframe = parsed_timeframe(options[:timeframe])
  end

  @cache_time = Time.now
end

Instance Attribute Details

#cache_file ⇒ Object (readonly)

Returns the value of attribute cache_file.



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# File 'lib/html-proofer/cache.rb', line 17

def cache_file
  @cache_file
end

#cache_log ⇒ Object (readonly)

Returns the value of attribute cache_log.



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# File 'lib/html-proofer/cache.rb', line 17

def cache_log
  @cache_log
end

#exists ⇒ Object (readonly)

Returns the value of attribute exists.



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# File 'lib/html-proofer/cache.rb', line 17

def exists
  @exists
end

#storage_dir ⇒ Object (readonly)

Returns the value of attribute storage_dir.



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# File 'lib/html-proofer/cache.rb', line 17

def storage_dir
  @storage_dir
end

Instance Method Details

#add(url, filenames, status, msg = '') ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 63

def add(url, filenames, status, msg = '')
  data = {
    time: @cache_time,
    filenames: filenames,
    status: status,
    message: msg
  }

  @cache_log[clean_url(url)] = data
end

#clean_url(url) ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 142

def clean_url(url)
  unescape_url(url)
end

#detect_url_changes(found) ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 74

def detect_url_changes(found)
  existing_urls = @cache_log.keys.map { |url| clean_url(url) }
  found_urls = found.keys.map { |url| clean_url(url) }

  # prepare to add new URLs detected
  additions = found.reject do |url, _|
    url = clean_url(url)
    if existing_urls.include?(url)
      true
    else
      @logger.log :debug, "Adding #{url} to cache check"
      false
    end
  end

  new_link_count = additions.length
  new_link_text = pluralize(new_link_count, 'link', 'links')
  @logger.log :info, "Adding #{new_link_text} to the cache..."

  # remove from cache URLs that no longer exist
  del = 0
  @cache_log.delete_if do |url, _|
    url = clean_url(url)
    if !found_urls.include?(url)
      @logger.log :debug, "Removing #{url} from cache check"
      del += 1
      true
    else
      false
    end
  end

  del_link_text = pluralize(del, 'link', 'links')
  @logger.log :info, "Removing #{del_link_text} from the cache..."

  additions
end

#load? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/html-proofer/cache.rb', line 116

def load?
  @load.nil?
end

#parsed_timeframe(timeframe) ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 46

def parsed_timeframe(timeframe)
  time, date = timeframe.match(/(\d+)(\D)/).captures
  time = time.to_f
  case date
  when 'M'
    time.months.ago
  when 'w'
    time.weeks.ago
  when 'd'
    time.days.ago
  when 'h'
    time.hours.ago
  else
    raise ArgumentError, "#{date} is not a valid timeframe!"
  end
end

#retrieve_urls(external_urls) ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 120

def retrieve_urls(external_urls)
  urls_to_check = detect_url_changes(external_urls)
  @cache_log.each_pair do |url, cache|
    if within_timeframe?(cache['time'])
      next if cache['message'].empty? # these were successes to skip
      urls_to_check[url] = cache['filenames'] # these are failures to retry
    else
      urls_to_check[url] = cache['filenames'] # pass or fail, recheck expired links
    end
  end
  urls_to_check
end

#setup_cache!(options) ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 146

def setup_cache!(options)
  @storage_dir = if options[:storage_dir]
                   options[:storage_dir]
                 else
                   DEFAULT_STORAGE_DIR
                 end

  FileUtils.mkdir_p(storage_dir) unless Dir.exist?(storage_dir)

  cache_file_name = if options[:cache_file]
                      options[:cache_file]
                    else
                      DEFAULT_CACHE_FILE_NAME
                    end

  @cache_file = File.join(storage_dir, cache_file_name)

  return unless File.exist?(cache_file)
  contents = File.read(cache_file)
  @cache_log = contents.empty? ? {} : JSON.parse(contents)
end

#size ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 42

def size
  @cache_log.length
end

#unescape_url(url) ⇒ Object

FIXME: it seems that Typhoeus actually acts on escaped URLs, but there’s no way to get at that information, and the cache stores unescaped URLs. Because of this, some links, such as github.com/search/issues?q=is:open+is:issue+fig are not matched as github.com/search/issues?q=is%3Aopen+is%3Aissue+fig



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# File 'lib/html-proofer/cache.rb', line 138

def unescape_url(url)
  Addressable::URI.unescape(url)
end

#urls ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 38

def urls
  @cache_log['urls'] || []
end

#within_timeframe?(time) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/html-proofer/cache.rb', line 34

def within_timeframe?(time)
  (@parsed_timeframe..@cache_time).cover?(time)
end

#write ⇒ Object 



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# File 'lib/html-proofer/cache.rb', line 112

def write
  File.write(cache_file, @cache_log.to_json)
end