Class: Sprockets::Manifest

Inherits:
Object
  • Object
show all
Includes:
ManifestUtils
Defined in:
lib/sprockets/manifest.rb

Overview

The Manifest logs the contents of assets compiled to a single directory. It records basic attributes about the asset for fast lookup without having to compile. A pointer from each logical path indicates which fingerprinted asset is the current one.

The JSON is part of the public API and should be considered stable. This should make it easy to read from other programming languages and processes that don’t have sprockets loaded. See ‘#assets` and `#files` for more information about the structure.

Constant Summary

Constants included from ManifestUtils

Sprockets::ManifestUtils::MANIFEST_RE

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ManifestUtils

#find_directory_manifest, #generate_manifest_path

Constructor Details

#initialize(*args) ⇒ Manifest

Create new Manifest associated with an ‘environment`. `filename` is a full path to the manifest json file. The file may or may not already exist. The dirname of the `filename` will be used to write compiled assets to. Otherwise, if the path is a directory, the filename will default a random “.sprockets-manifest-*.json” file in that directory.

Manifest.new(environment, "./public/assets/manifest.json")



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# File 'lib/sprockets/manifest.rb', line 32

def initialize(*args)
  if args.first.is_a?(Base) || args.first.nil?
    @environment = args.shift
  end

  @directory, @filename = args[0], args[1]

  # Whether the manifest file is using the old manifest-*.json naming convention
  @legacy_manifest = false

  # Expand paths
  @directory = File.expand_path(@directory) if @directory
  @filename  = File.expand_path(@filename) if @filename

  # If filename is given as the second arg
  if @directory && File.extname(@directory) != ""
    @directory, @filename = nil, @directory
  end

  # Default dir to the directory of the filename
  @directory ||= File.dirname(@filename) if @filename

  # If directory is given w/o filename, pick a random manifest location
  if @directory && @filename.nil?
    @filename = find_directory_manifest(@directory, logger)
  end

  unless @directory && @filename
    raise ArgumentError, "manifest requires output filename"
  end

  data = {}

  begin
    if File.exist?(@filename)
      data = json_decode(File.read(@filename))
    end
  rescue JSON::ParserError => e
    logger.error "#{@filename} is invalid: #{e.class} #{e.message}"
  end

  @data = data
end

Instance Attribute Details

#directory ⇒ Object (readonly) Also known as: dir

Returns the value of attribute directory.



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# File 'lib/sprockets/manifest.rb', line 80

def directory
  @directory
end

#environment ⇒ Object (readonly)

Returns the value of attribute environment.



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# File 'lib/sprockets/manifest.rb', line 22

def environment
  @environment
end

#filename ⇒ Object (readonly) Also known as: path

Returns String path to manifest.json file.



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# File 'lib/sprockets/manifest.rb', line 77

def filename
  @filename
end

Instance Method Details

#assets ⇒ Object

Returns internal assets mapping. Keys are logical paths which map to the latest fingerprinted filename.

Logical path (String): Fingerprint path (String)

{ "application.js" => "application-2e8e9a7c6b0aafa0c9bdeec90ea30213.js",
  "jquery.js"      => "jquery-ae0908555a245f8266f77df5a8edca2e.js" }



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# File 'lib/sprockets/manifest.rb', line 91

def assets
  @data['assets'] ||= {}
end

#clean(count = 2, age = 3600) ⇒ Object

Cleanup old assets in the compile directory. By default it will keep the latest version, 2 backups and any created within the past hour.

Examples

To force only 1 backup to be kept, set count=1 and age=0.

To only keep files created within the last 10 minutes, set count=0 and
age=600.



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# File 'lib/sprockets/manifest.rb', line 246

def clean(count = 2, age = 3600)
  asset_versions = files.group_by { |_, attrs| attrs['logical_path'] }

  asset_versions.each do |logical_path, versions|
    current = assets[logical_path]

    versions.reject { |path, _|
      path == current
    }.sort_by { |_, attrs|
      # Sort by timestamp
      Time.parse(attrs['mtime'])
    }.reverse.each_with_index.drop_while { |(_, attrs), index|
      _age = [0, Time.now - Time.parse(attrs['mtime'])].max
      # Keep if under age or within the count limit
      _age < age || index < count
    }.each { |(path, _), _|
       # Remove old assets
      remove(path)
    }
  end
end

#clobber ⇒ Object

Wipe directive



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# File 'lib/sprockets/manifest.rb', line 269

def clobber
  FileUtils.rm_r(directory) if File.exist?(directory)
  logger.info "Removed #{directory}"
  # if we have an environment clear the cache too
  environment.cache.clear if environment
  nil
end

#compile(*args) ⇒ Object

Compile asset to directory. The asset is written to a fingerprinted filename like ‘application-2e8e9a7c6b0aafa0c9bdeec90ea30213.js`. An entry is also inserted into the manifest file.

compile("application.js")



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# File 'lib/sprockets/manifest.rb', line 161

def compile(*args)
  unless environment
    raise Error, "manifest requires environment for compilation"
  end

  filenames            = []
  concurrent_exporters = []

  assets_to_export = Concurrent::Array.new
  find(*args) do |asset|
    assets_to_export << asset
  end

  assets_to_export.each do |asset|
    mtime = Time.now.iso8601
    files[asset.digest_path] = {
      'logical_path' => asset.logical_path,
      'mtime'        => mtime,
      'size'         => asset.bytesize,
      'digest'       => asset.hexdigest,

      # Deprecated: Remove beta integrity attribute in next release.
      # Callers should DigestUtils.hexdigest_integrity_uri to compute the
      # digest themselves.
      'integrity'    => DigestUtils.hexdigest_integrity_uri(asset.hexdigest)
    }
    assets[asset.logical_path] = asset.digest_path

    filenames << asset.filename

    promise      = nil
    exporters_for_asset(asset) do |exporter|
      next if exporter.skip?(logger)

      if promise.nil?
        promise = Concurrent::Promise.new(executor: executor) { exporter.call }
        concurrent_exporters << promise.execute
      else
        concurrent_exporters << promise.then { exporter.call }
      end
    end
  end

  # make sure all exporters have finished before returning the main thread
  concurrent_exporters.each(&:wait!)
  save

  filenames
end

#files ⇒ Object

Returns internal file directory listing. Keys are filenames which map to an attributes array.

 Fingerprint path (String):
   logical_path: Logical path (String)
   mtime: ISO8601 mtime (String)
   digest: Base64 hex digest (String)

{ "application-2e8e9a7c6b0aafa0c9bdeec90ea30213.js" =>
    { 'logical_path' => "application.js",
      'mtime' => "2011-12-13T21:47:08-06:00",
      'digest' => "2e8e9a7c6b0aafa0c9bdeec90ea30213" } }



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# File 'lib/sprockets/manifest.rb', line 108

def files
  @data['files'] ||= {}
end

#find(*args, &block) ⇒ Object

Public: Find all assets matching pattern set in environment.

Returns Enumerator of Assets.



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# File 'lib/sprockets/manifest.rb', line 115

def find(*args, &block)
  unless environment
    raise Error, "manifest requires environment for compilation"
  end

  return to_enum(__method__, *args) unless block_given?

  environment = self.environment.cached
  promises = args.flatten.map do |path|
    Concurrent::Promise.execute(executor: executor) do
      environment.find_all_linked_assets(path).to_a
    end
  end

  promises.each do |promise|
    promise.value!.each(&block)
  end

  nil
end

#find_sources(*args) ⇒ Object

Public: Find the source of assets by paths.

Returns Enumerator of assets file content.



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# File 'lib/sprockets/manifest.rb', line 139

def find_sources(*args)
  return to_enum(__method__, *args) unless block_given?

  if environment
    find(*args).each do |asset|
      yield asset.source
    end
  else
    args.each do |path|
      asset = assets[path]
      yield File.binread(File.join(dir, asset)) if asset
    end
  end
end

#remove(filename) ⇒ Object

Removes file from directory and from manifest. ‘filename` must be the name with any directory path.

manifest.remove("application-2e8e9a7c6b0aafa0c9bdeec90ea30213.js")



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# File 'lib/sprockets/manifest.rb', line 216

def remove(filename)
  path = File.join(dir, filename)
  gzip = "#{path}.gz"
  logical_path = files[filename]['logical_path']

  if assets[logical_path] == filename
    assets.delete(logical_path)
  end

  files.delete(filename)
  FileUtils.rm(path) if File.exist?(path)
  FileUtils.rm(gzip) if File.exist?(gzip)

  save

  logger.info "Removed #{filename}"

  nil
end

#save ⇒ Object

Persist manifest back to FS



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# File 'lib/sprockets/manifest.rb', line 278

def save
  data = json_encode(@data)
  FileUtils.mkdir_p File.dirname(@filename)
  PathUtils.atomic_write(@filename) do |f|
    f.write(data)
  end
end