Class: Pod::CDNSource

Inherits:
Source
  • Object
show all
Includes:
Concurrent
Defined in:
lib/cocoapods-core/cdn_source.rb

Overview

Subclass of Pod::Source to provide support for CDN-based Specs repositories

Direct Known Subclasses

TrunkSource

Constant Summary collapse

MAX_CONCURRENCY = 
(ENV['COCOAPODS_CDN_MAX_CONCURRENCY'] || 200).to_i
MAX_NUMBER_OF_RETRIES = 
(ENV['COCOAPODS_CDN_MAX_NUMBER_OF_RETRIES'] || 5).to_i
HYDRA_EXECUTOR =

Single thread executor for all network activity.

Concurrent::SingleThreadExecutor.new

Constants inherited from Source

Source::DEFAULT_SPECS_BRANCH

Instance Attribute Summary

Attributes inherited from Source

#metadata, #repo

Querying the source collapse

Searching the source collapse

Instance Method Summary collapse

Methods inherited from Source

#<=>, #diff_until_commit_hash, #fuzzy_search, #git_commit_hash, #git_tracking_branch, #inspect, #load_spec_gracefully, #metadata_path, #name, #pod_path, #pods_for_specification_paths, #repo_git, #set, #specification, #to_hash, #to_yaml, #unchanged_github_repo?, #update_git_repo, #verify_compatibility!

Constructor Details

#initialize(repo) ⇒ CDNSource

Returns a new instance of CDNSource.

Parameters:

  • repo (String) —

    The name of the repository



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# File 'lib/cocoapods-core/cdn_source.rb', line 22

def initialize(repo)
  @check_existing_files_for_update = false
  # Optimization: we initialize startup_time when the source is first initialized
  # and then test file modification dates against it. Any file that was touched
  # after the source was initialized, is considered fresh enough.
  @startup_time = Time.new

  @version_arrays_by_fragment_by_name = {}

  super(repo)
end

Instance Method Details

#algolia_search_index ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 302

def algolia_search_index
  @index ||= begin
    require 'algoliasearch'

    raise Informative, "Cannot perform full-text search in repo #{name} because it's missing Algolia config" if download_file('AlgoliaSearch.yml').nil?
    algolia_config = YAMLHelper.load_string(local_file('AlgoliaSearch.yml', &:read))

    client = Algolia::Client.new(:application_id => algolia_config['application_id'], :api_key => algolia_config['api_key'])
    Algolia::Index.new(algolia_config['index'], client)
  end
end

#all_specs ⇒ Array<Specification>

Returns all the specifications contained by the source.

Returns:

  • (Array<Specification>) —

    all the specifications contained by the source.

Raises:



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# File 'lib/cocoapods-core/cdn_source.rb', line 178

def all_specs
  raise Informative, "Can't retrieve all the specs for a CDN-backed source, it will take forever"
end

#backoff_time(retries) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 435

def backoff_time(retries)
  current_retry = MAX_NUMBER_OF_RETRIES - retries
  4 * 2**current_retry
end

#concurrent_requests_catching_errors ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 484

def concurrent_requests_catching_errors
  yield
rescue MultipleErrors => e
  # aggregated error message from `Concurrent`
  errors = e.errors
  raise Informative, "CDN: #{name} Repo update failed - #{e.errors.size} error(s):\n#{errors.join("\n")}"
end

#debug(message) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 476

def debug(message)
  if defined?(Pod::UI)
    Pod::UI.message(message)
  else
    CoreUI.puts(message)
  end
end

#deprecated_local_podspecs ⇒ Object 



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# File 'lib/cocoapods-core/cdn_source.rb', line 78

def deprecated_local_podspecs
  download_file('deprecated_podspecs.txt')
  local_file('deprecated_podspecs.txt', &:to_a).
    map { |f| Pathname.new(f.chomp) }.
    select { |f| repo.join(f).exist? }
end

#download_and_save_with_retries_async(partial_url, file_remote_url, etag, retries = MAX_NUMBER_OF_RETRIES) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 374

def download_and_save_with_retries_async(partial_url, file_remote_url, etag, retries = MAX_NUMBER_OF_RETRIES)
  path = repo + partial_url
  etag_path = path.sub_ext(path.extname + '.etag')

  download_task = download_typhoeus_impl_async(file_remote_url, etag).then do |response|
    case response.response_code
    when 301, 302
      redirect_location = response.headers['location']
      debug "CDN: #{name} Redirecting from #{file_remote_url} to #{redirect_location}"
      download_and_save_with_retries_async(partial_url, redirect_location, etag)
    when 304
      debug "CDN: #{name} Relative path not modified: #{partial_url}"
      # We need to update the file modification date, as it is later used for freshness
      # optimization. See #initialize for more information.
      FileUtils.touch path
      partial_url
    when 200
      File.open(path, 'w') { |f| f.write(response.response_body.force_encoding('UTF-8')) }

      etag_new = response.headers['etag'] unless response.headers.nil?
      debug "CDN: #{name} Relative path downloaded: #{partial_url}, save ETag: #{etag_new}"
      File.open(etag_path, 'w') { |f| f.write(etag_new) } unless etag_new.nil?
      partial_url
    when 404
      debug "CDN: #{name} Relative path couldn't be downloaded: #{partial_url} Response: #{response.response_code}"
      nil
    when 502, 503, 504
      # Retryable HTTP errors, usually related to server overloading
      if retries <= 1
        raise Informative, "CDN: #{name} URL couldn't be downloaded: #{file_remote_url} Response: #{response.response_code} #{response.response_body}"
      else
        debug "CDN: #{name} URL couldn't be downloaded: #{file_remote_url} Response: #{response.response_code} #{response.response_body}, retries: #{retries - 1}"
        exponential_backoff_async(retries).then do
          download_and_save_with_retries_async(partial_url, file_remote_url, etag, retries - 1)
        end
      end
    when 0
      # Non-HTTP errors, usually network layer
      if retries <= 1
        raise Informative, "CDN: #{name} URL couldn't be downloaded: #{file_remote_url} Response: #{response.return_message}"
      else
        debug "CDN: #{name} URL couldn't be downloaded: #{file_remote_url} Response: #{response.return_message}, retries: #{retries - 1}"
        exponential_backoff_async(retries).then do
          download_and_save_with_retries_async(partial_url, file_remote_url, etag, retries - 1)
        end
      end
    else
      raise Informative, "CDN: #{name} URL couldn't be downloaded: #{file_remote_url} Response: #{response.response_code} #{response.response_body}"
    end
  end

  # Calling `Future#run` flattens the chained futures created by retries or redirects
  #
  # Does not, in fact, run the task - that is already happening in Hydra at this point
  download_task.run
end

#download_file(partial_url) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 340

def download_file(partial_url)
  # Block the main thread waiting for Hydra to finish
  #
  # Used for single-file downloads
  download_file_async(partial_url).wait!
end

#download_file_async(partial_url) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 347

def download_file_async(partial_url)
  file_remote_url = Addressable::URI.encode(url + partial_url.to_s)
  path = repo + partial_url

  file_okay = local_file_okay?(partial_url)
  if file_okay
    if @startup_time < File.mtime(path)
      debug "CDN: #{name} Relative path: #{partial_url} modified during this run! Returning local"
      return Promises.fulfilled_future(partial_url, HYDRA_EXECUTOR)
    end

    unless @check_existing_files_for_update
      debug "CDN: #{name} Relative path: #{partial_url} exists! Returning local because checking is only performed in repo update"
      return Promises.fulfilled_future(partial_url, HYDRA_EXECUTOR)
    end
  end

  path.dirname.mkpath

  etag_path = path.sub_ext(path.extname + '.etag')

  etag = File.read(etag_path) if file_okay && File.exist?(etag_path)
  debug "CDN: #{name} Relative path: #{partial_url}, has ETag? #{etag}" unless etag.nil?

  download_and_save_with_retries_async(partial_url, file_remote_url, etag)
end

#download_typhoeus_impl_async(file_remote_url, etag) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 445

def download_typhoeus_impl_async(file_remote_url, etag)
  require 'typhoeus'

  # Create a prefereably HTTP/2 request - the protocol is ultimately responsible for picking
  # the maximum supported protocol
  # When debugging with proxy, use the following extra options:
  # :proxy => 'http://localhost:8888',
  # :ssl_verifypeer => false,
  # :ssl_verifyhost => 0,
  request = Typhoeus::Request.new(
    file_remote_url,
    :method => :get,
    :http_version => :httpv2_0,
    :timeout => 10,
    :connecttimeout => 10,
    :accept_encoding => 'gzip',
    :netrc => :optional,
    :netrc_file => Netrc.default_path,
    :headers => etag.nil? ? {} : { 'If-None-Match' => etag },
  )

  future = Promises.resolvable_future_on(HYDRA_EXECUTOR)
  queue_request(request)
  request.on_complete do |response|
    future.fulfill(response)
  end

  # This `Future` should never reject, network errors are exposed on `Typhoeus::Response`
  future
end

#ensure_versions_file_loaded(fragment) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 279

def ensure_versions_file_loaded(fragment)
  return if !@version_arrays_by_fragment_by_name[fragment].nil? && !@check_existing_files_for_update

  # Index file that contains all the versions for all the pods in the shard.
  # We use those because you can't get a directory listing from a CDN.
  index_file_name = index_file_name_for_fragment(fragment)
  download_file(index_file_name)
  file_okay = local_file_okay?(index_file_name)
  if file_okay
    versions_raw = local_file(index_file_name, &:to_a).map(&:chomp)
    @version_arrays_by_fragment_by_name[fragment] = versions_raw.reduce({}) do |hash, row|
      row = row.split('/')
      pod = row.shift
      versions = row

      hash[pod] = versions
      hash
    end
  else
    debug "CDN: #{name} Relative path: #{index_file_name} not available in this source set"
  end
end

#exponential_backoff_async(retries) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 431

def exponential_backoff_async(retries)
  sleep_async(backoff_time(retries))
end

#files_definitely_to_update ⇒ Object 



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# File 'lib/cocoapods-core/cdn_source.rb', line 74

def files_definitely_to_update
  Pathname.glob(repo.join('**/*.{txt,yml}')).map { |f| f.relative_path_from(repo).to_s }
end

#git? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 269

def git?
  false
end

#index_file_name_for_fragment(fragment) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 314

def index_file_name_for_fragment(fragment)
  fragment_joined = fragment.join('_')
  fragment_joined = '_' + fragment_joined unless fragment.empty?
  "all_pods_versions#{fragment_joined}.txt"
end

#indexable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 273

def indexable?
  false
end

#local_file(partial_url) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 329

def local_file(partial_url)
  file_path = repo.join(partial_url)
  File.open(file_path) do |file|
    yield file if block_given?
  end
end

#local_file_okay?(partial_url) ⇒ Boolean (private)

Returns:

  • (Boolean) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 324

def local_file_okay?(partial_url)
  file_path = repo.join(partial_url)
  File.exist?(file_path) && File.size(file_path) > 0
end

#pod_sets ⇒ Array<Sets>

Returns the sets of all the Pods.

Returns:

  • (Array<Sets>) —

    the sets of all the Pods.

Raises:



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# File 'lib/cocoapods-core/cdn_source.rb', line 184

def pod_sets
  raise Informative, "Can't retrieve all the pod sets for a CDN-backed source, it will take forever"
end

#pod_shard_fragment(pod_name) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 320

def pod_shard_fragment(pod_name)
  metadata.path_fragment(pod_name)[0..-2]
end

#pods ⇒ Array<String>

Returns the list of the name of all the Pods.

Returns:

  • (Array<String>) —

    the list of the name of all the Pods.



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# File 'lib/cocoapods-core/cdn_source.rb', line 96

def pods
  download_file('all_pods.txt')
  local_file('all_pods.txt', &:to_a).map(&:chomp)
end

#preheat_existing_files ⇒ Object 



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# File 'lib/cocoapods-core/cdn_source.rb', line 60

def preheat_existing_files
  files_to_update = files_definitely_to_update + deprecated_local_podspecs - ['deprecated_podspecs.txt']
  debug "CDN: #{name} Going to update #{files_to_update.count} files"

  concurrent_requests_catching_errors do
    # Queue all tasks first
    loaders = files_to_update.map do |file|
      download_file_async(file)
    end
    # Block and wait for all to complete running on Hydra
    Promises.zip_futures_on(HYDRA_EXECUTOR, *loaders).wait!
  end
end

#queue_request(request) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 492

def queue_request(request)
  @hydra ||= Typhoeus::Hydra.new(:max_concurrency => MAX_CONCURRENCY)

  # Queue the request into the Hydra (libcurl reactor).
  @hydra.queue(request)

  # Cycle the reactor on a separate thread
  #
  # The way it works is that if more requests are queued while Hydra is in the `#run`
  # method, it will keep executing them
  #
  # The upcoming calls to `#run` will simply run empty.
  HYDRA_EXECUTOR.post(@hydra, &:run)
end

#refresh_metadata ⇒ Object 



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# File 'lib/cocoapods-core/cdn_source.rb', line 46

def refresh_metadata
  if metadata.nil?
    unless repo.exist?
      debug "CDN: Repo #{name} does not exist!"
      return
    end

    specs_dir.mkpath
    download_file('CocoaPods-version.yml')
  end

  super
end

#relative_pod_path(pod_name) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 336

def relative_pod_path(pod_name)
  pod_path(pod_name).relative_path_from(repo)
end

#search(query) ⇒ Set

TODO:

Rename to #load_set

Note:

This method is optimized for fast lookups by name, i.e. it does not require iterating through #pod_sets

Returns a set for a given dependency. The set is identified by the name of the dependency and takes into account subspecs.

Returns:

  • (Set) —

    a set for a given dependency. The set is identified by the name of the dependency and takes into account subspecs.



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# File 'lib/cocoapods-core/cdn_source.rb', line 199

def search(query)
  unless specs_dir
    raise Informative, "Unable to find a source named: `#{name}`"
  end
  if query.is_a?(Dependency)
    query = query.root_name
  end

  fragment = pod_shard_fragment(query)

  ensure_versions_file_loaded(fragment)

  version_arrays_by_name = @version_arrays_by_fragment_by_name[fragment] || {}

  found = version_arrays_by_name[query].nil? ? nil : query

  if found
    set = set(query)
    set if set.specification_name == query
  end
end

#search_by_name(query, full_text_search = false) ⇒ Array<Set>

Note:

full text search requires to load the specification for each pod, and therefore not supported.

Returns The list of the sets that contain the search term.

Parameters:

  • query (String) —

    the search term. Can be a regular expression.

  • full_text_search (Boolean) (defaults to: false) —

    performed using Algolia

Returns:

  • (Array<Set>) —

    The list of the sets that contain the search term.



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# File 'lib/cocoapods-core/cdn_source.rb', line 232

def search_by_name(query, full_text_search = false)
  if full_text_search
    require 'algoliasearch'
    begin
      algolia_result = algolia_search_index.search(query, :attributesToRetrieve => 'name')
      names = algolia_result['hits'].map { |r| r['name'] }
      names.map { |n| set(n) }.reject { |s| s.versions.compact.empty? }
    rescue Algolia::AlgoliaError => e
      raise Informative, "CDN: #{name} - Cannot perform full-text search because Algolia returned an error: #{e}"
    end
  else
    super(query)
  end
end

#sleep_async(seconds) ⇒ Object (private) 



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# File 'lib/cocoapods-core/cdn_source.rb', line 440

def sleep_async(seconds)
  # Async sleep to avoid blocking either the main or the Hydra thread
  Promises.schedule_on(HYDRA_EXECUTOR, seconds)
end

#specification_path(name, version) ⇒ Pathname

Returns the path of the specification with the given name and version.

Parameters:

  • name (String) —

    the name of the Pod.

  • version (Version, String) —

    the version for the specification.

Returns:

  • (Pathname) —

    The path of the specification.

Raises:

  • (ArgumentError) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 161

def specification_path(name, version)
  raise ArgumentError, 'No name' unless name
  raise ArgumentError, 'No version' unless version
  unless versions(name).include?(Version.new(version))
    raise StandardError, "Unable to find the specification #{name} " \
      "(#{version}) in the #{self.name} source."
  end

  podspec_version_path_relative = Pathname.new(version.to_s).join("#{name}.podspec.json")
  relative_podspec = relative_pod_path(name).join(podspec_version_path_relative).to_s
  download_file(relative_podspec)
  pod_path(name).join(podspec_version_path_relative)
end

#specs_dir ⇒ Pathname

Returns The directory where the specs are stored.

Returns:

  • (Pathname) —

    The directory where the specs are stored.



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# File 'lib/cocoapods-core/cdn_source.rb', line 87

def specs_dir
  @specs_dir ||= repo + 'Specs'
end

#type ⇒ String

Returns The type of the source.

Returns:

  • (String) —

    The type of the source.



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# File 'lib/cocoapods-core/cdn_source.rb', line 42

def type
  'CDN'
end

#update(_show_output) ⇒ Array<String>

Check update dates for all existing files. Does not download non-existing specs, since CDN-backed repo is updated live.

Parameters:

  • show_output (Boolean)

Returns:

  • (Array<String>) —

    Always returns empty array, as it cannot know everything that actually changed.



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# File 'lib/cocoapods-core/cdn_source.rb', line 255

def update(_show_output)
  @check_existing_files_for_update = true
  begin
    preheat_existing_files
  ensure
    @check_existing_files_for_update = false
  end
  []
end

#updateable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 265

def updateable?
  true
end

#url ⇒ String

Returns The URL of the source.

Returns:

  • (String) —

    The URL of the source.



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# File 'lib/cocoapods-core/cdn_source.rb', line 36

def url
  @url ||= File.read(repo.join('.url')).chomp.chomp('/') + '/'
end

#versions(name) ⇒ Array<Version>

Returns all the available versions for the Pod, sorted from highest to lowest.

Parameters:

  • name (String) —

    the name of the Pod.

Returns:

  • (Array<Version>) —

    all the available versions for the Pod, sorted from highest to lowest.

Raises:

  • (ArgumentError) 


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# File 'lib/cocoapods-core/cdn_source.rb', line 107

def versions(name)
  return nil unless specs_dir
  raise ArgumentError, 'No name' unless name

  fragment = pod_shard_fragment(name)

  ensure_versions_file_loaded(fragment)

  return @versions_by_name[name] unless @versions_by_name[name].nil?

  pod_path_actual = pod_path(name)
  pod_path_relative = relative_pod_path(name)

  return nil if @version_arrays_by_fragment_by_name.dig(fragment, name).nil?

  concurrent_requests_catching_errors do
    loaders = []

    @versions_by_name[name] ||= @version_arrays_by_fragment_by_name[fragment][name].map do |version|
      # Optimization: ensure all the podspec files at least exist. The correct one will get refreshed
      # in #specification_path regardless.
      podspec_version_path_relative = Pathname.new(version).join("#{name}.podspec.json")

      unless pod_path_actual.join(podspec_version_path_relative).exist?
        # Queue all podspec download tasks first
        loaders << download_file_async(pod_path_relative.join(podspec_version_path_relative).to_s)
      end

      begin
        Version.new(version) if version[0, 1] != '.'
      rescue ArgumentError
        raise Informative, 'An unexpected version directory ' \
        "`#{version}` was encountered for the " \
        "`#{pod_path_actual}` Pod in the `#{name}` repository."
      end
    end.compact.sort.reverse

    # Block and wait for all to complete running on Hydra
    Promises.zip_futures_on(HYDRA_EXECUTOR, *loaders).wait!
  end

  @versions_by_name[name]
end