Class: OpenStax::Utilities::Assets::Manifest

Inherits:
Object
  • Object
show all
Defined in:
lib/openstax/utilities/assets/manifest.rb

Overview

Reads and parses the assets manifest

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Manifest

Returns a new instance of Manifest.



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# File 'lib/openstax/utilities/assets/manifest.rb', line 10

def initialize
  @assets = HashWithIndifferentAccess.new

  url = OpenStax::Utilities::Assets.url_for('assets.json')

  begin
    response = self.class.client.get url

    if response.success?
      contents = JSON.parse response.body

      @version = contents['version']

      if contents['entrypoints'].blank?
        Rails.logger.error { "failed to parse manifest from #{url}" }
      else
        contents['entrypoints'].each do |entry_key, chunks|
          @assets[entry_key] = chunks['js'].map do |chunk|
            OpenStax::Utilities::Assets.url_for(chunk)
          end
        end
      end
    else
      Rails.logger.error { "status #{response.status} when reading remote url: #{url}" }
    end
  rescue Faraday::ConnectionFailed, Addressable::URI::InvalidURIError, Errno::ECONNREFUSED
  end

  Rails.logger.info do
    "running in development mode with assets served by webpack at #{
      OpenStax::Utilities::Assets.url
    }"
  end if @assets.blank?
end

Instance Attribute Details

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/openstax/utilities/assets/manifest.rb', line 8

def version
  @version
end

Class Method Details

.client ⇒ Object

Faraday is probably thread-safe but makes no guarantees github.com/lostisland/faraday/issues/370 We could potentially reuse the client object However, bugs happen: github.com/lostisland/faraday/issues/1068



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# File 'lib/openstax/utilities/assets/manifest.rb', line 57

def self.client
  Faraday.new do |builder|
    builder.use :http_cache, store: Rails.cache

    builder.adapter Faraday.default_adapter
  end
end

Instance Method Details

#[](asset) ⇒ Object 



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# File 'lib/openstax/utilities/assets/manifest.rb', line 45

def [](asset)
  return [ OpenStax::Utilities::Assets.url_for("#{asset}.js") ] if @assets.blank?

  @assets[asset] || []
end