Minha palestra apresentando minha jornada sobre um código Ruby feito com otimização prematura, passando por Elixir, Crystal e de volta ao Ruby, escrito da forma arquiteturalmente mais "correta" e que no final se tornou até mais performática. Esta é a minha palestra "Premature Optimization" versão "Code-Only". #THECONFBR

1. PREMATURE
OPTIMIZATION
The Root of ALL Evil
@akitaonrails
(CODE VERSION)

2. @akitaonrails

11. manga-downloadr
-u http://www.mangareader.net/onepunch-man
-d /tmp/manga/one-punch-man
-n one-punch-man

12. #!/usr/bin/env ruby
$LOAD_PATH.unshift File.join(File.dirname(__FILE__), '..', 'lib')
require 'optparse'
options = { test: false }
option_parser = OptionParser.new do |opts|
opts.banner = "Usage: manga-downloadr [options]"
opts.on("-t", "--test", "Test routine") do |t|
options[:url] = "http://www.mangareader.net/onepunch-man"
options[:name] = "one-punch-man"
options[:directory] = "/tmp/manga-downloadr/one-punch-man"
options[:test] = true
end
opts.on("-u URL", "--url URL",
"Full MangaReader.net manga homepage URL - required") do |v|
options[:url] = v
end
opts.on("-n NAME", "--name NAME",
"slug to be used for the sub-folder to store all manga files - required") do |n|
options[:name] = n
end
opts.on("-d DIRECTORY", "--directory DIRECTORY",
"main folder where all mangas will be stored - required") do |d|
options[:directory] = d
end
opts.on("-h", "--help", "Show this message") do
puts opts
exit
end
end

13. require 'manga-downloadr'
generator = MangaDownloadr::Workflow.create(options[:url], options[:name],
options[:directory])
generator.fetch_chapter_urls!
generator.fetch_page_urls!
generator.fetch_image_urls!
generator.fetch_images!
generator.compile_ebooks!

14. require 'manga-downloadr'
generator = MangaDownloadr::Workflow.create(options[:url], options[:name],
options[:directory])
puts "Massive parallel scanning of all chapters "
generator.fetch_chapter_urls!
puts "nMassive parallel scanning of all pages "
generator.fetch_page_urls!
puts "nMassive parallel scanning of all images "
generator.fetch_image_urls!
puts "nTotal page links found: #{generator.chapter_pages_count}"
puts "nMassive parallel download of all page images "
generator.fetch_images!
puts "nCompiling all images into PDF volumes "
generator.compile_ebooks!
puts "nProcess finished."

15. require 'manga-downloadr'
generator = MangaDownloadr::Workflow.create(options[:url], options[:name],
options[:directory])
unless generator.state?(:chapter_urls)
puts "Massive parallel scanning of all chapters "
generator.fetch_chapter_urls!
end
unless generator.state?(:page_urls)
puts "nMassive parallel scanning of all pages "
generator.fetch_page_urls!
end
unless generator.state?(:image_urls)
puts "nMassive parallel scanning of all images "
generator.fetch_image_urls!
puts "nTotal page links found: #{generator.chapter_pages_count}"
end
unless generator.state?(:images)
puts "nMassive parallel download of all page images "
generator.fetch_images!
end
unless options[:test]
puts "nCompiling all images into PDF volumes "
generator.compile_ebooks!
end
puts "nProcess finished."
MangaDownloadr::Workflow

16. MangaDownloadr::Workflowmodule MangaDownloadr
ImageData = Struct.new(:folder, :filename, :url)
class Workflow
def initialize(root_url = nil, manga_name = nil, manga_root = nil, options = {})
end
def fetch_chapter_urls!
end
def fetch_page_urls!
end
def fetch_image_urls!
end
def fetch_images!
end
def compile_ebooks!
end
def state?(state)
end
private
def current_state(state)
end
end
end
fetch_chapter_urls!

17. module MangaDownloadr
ImageData = Struct.new(:folder, :filename, :url)
class Workflow
def initialize(root_url = nil, manga_name = nil, manga_root = nil, options = {})
end
def fetch_chapter_urls!
end
def fetch_page_urls!
end
def fetch_image_urls!
end
def fetch_images!
end
def compile_ebooks!
end
def state?(state)
end
private
def current_state(state)
end
end
end
fetch_chapter_urls!

18. fetch_chapter_urls!def fetch_chapter_urls!
doc = Nokogiri::HTML(open(manga_root_url))
self.chapter_list = doc.css("#listing a").map { |l| l['href']}
self.manga_title = doc.css("#mangaproperties h1").first.text
current_state :chapter_urls
end

19. fetch_chapter_urls!def fetch_chapter_urls!
doc = Nokogiri::HTML(open(manga_root_url))
self.chapter_list = doc.css("#listing a").map { |l| l['href']}
self.manga_title = doc.css("#mangaproperties h1").first.text
current_state :chapter_urls
end

20. def fetch_page_urls!
chapter_list.each do |chapter_link|
response = Typhoeus.get "http://www.mangareader.net#{chapter_link}"
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

21. def fetch_page_urls!
chapter_list.each do |chapter_link|
begin
response = Typhoeus.get "http://www.mangareader.net#{chapter_link}"
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
rescue => e
puts e
end
end
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

22. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

23. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

24. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

25. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

26. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

27. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

28. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

29. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{chapter_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
pages = chapter_doc.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
chapter_pages.merge!(chapter_link => pages.map { |p| p['value'] })
print '.'
rescue => e
self.fetch_page_urls_errors << { url: chapter_link, error: e, body: response.body }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty?
puts "n Errors fetching page urls:"
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_pages.values.inject(0) { |total, list| total += list.size }
current_state :page_urls
end

30. def fetch_page_urls!
hydra = Typhoeus::Hydra.new(max_con
chapter_list.each do |chapter_link|
begin
request = Typhoeus::Request.new
request.on_complete do |respons
begin
chapter_doc = Nokogiri::HTM
pages = chapter_doc.xpath("
chapter_pages.merge!(chapte
print '.'
rescue => e
self.fetch_page_urls_errors
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
hydra.run
unless fetch_page_urls_errors.empty
puts "n Errors fetching page url
puts fetch_page_urls_errors
end
self.chapter_pages_count = chapter_
current_state :page_urls
end

31. def fetch_image_urls!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each do |chapter_key|
chapter_pages[chapter_key].each do |page_link|
begin
request = Typhoeus::Request.new "http://www.mangareader.net#{page_link}"
request.on_complete do |response|
begin
chapter_doc = Nokogiri::HTML(response.body)
image = chapter_doc.css('#img').first
tokens = image['alt'].match("^(.*?)s-s(.*?)$")
extension = File.extname(URI.parse(image['src']).path)
chapter_images.merge!(chapter_key => []) if chapter_images[chapter_key].nil?
chapter_images[chapter_key] << ImageData.new( tokens[1], "#{tokens[2]}#{extension}", image['src'] )
print '.'
rescue => e
self.fetch_image_urls_errors << { url: page_link, error: e }
print 'x'
end
end
hydra.queue request
rescue => e
puts e
end
end
end
hydra.run
unless fetch_image_urls_errors.empty?
puts "nErrors fetching image urls:"
puts fetch_image_urls_errors
end
current_state :image_urls
end

32. def fetch_images!
hydra = Typhoeus::Hydra.new(max_concurrency: hydra_concurrency)
chapter_list.each_with_index do |chapter_key, chapter_index|
chapter_images[chapter_key].each do |file|
downloaded_filename = File.join(manga_root_folder, file.folder, file.filename)
next if File.exists?(downloaded_filename) # effectively resumes the download list without re-downloading eve
request = Typhoeus::Request.new file.url
request.on_complete do |response|
begin
# download
FileUtils.mkdir_p(File.join(manga_root_folder, file.folder))
File.open(downloaded_filename, "wb+") { |f| f.write response.body }
unless is_test
# resize
image = Magick::Image.read( downloaded_filename ).first
resized = image.resize_to_fit(600, 800)
resized.write( downloaded_filename ) { self.quality = 50 }
GC.start # to avoid a leak too big (ImageMagick is notorious for that, specially on resizes)
end
print '.'
rescue => e
self.fetch_images_errors << { url: file.url, error: e }
print '#'
end
end
hydra.queue request
end
end
hydra.run
unless fetch_images_errors.empty?
puts "nErrors downloading images:"
puts fetch_images_errors
end
current_state :images
end

33. def compile_ebooks!
folders = Dir[manga_root_folder + "/*/"].sort_by { |element| ary = element.split(" ").last.to_i }
self.download_links = folders.inject([]) do |list, folder|
list += Dir[folder + "*.*"].sort_by { |element| ary = element.split(" ").last.to_i }
end
# concatenating PDF files (250 pages per volume)
chapter_number = 0
while !download_links.empty?
chapter_number += 1
pdf_file = File.join(manga_root_folder, "#{manga_title} #{chapter_number}.pdf")
list = download_links.slice!(0..pages_per_volume)
Prawn::Document.generate(pdf_file, page_size: page_size) do |pdf|
list.each do |image_file|
begin
pdf.image image_file, position: :center, vposition: :center
rescue => e
puts "Error in #{image_file} - #{e}"
end
end
end
print '.'
end
current_state :ebooks
end

34. manga-downloadr -t
199.69s user 10.30s system 124% cpu 2:48.14 total

35. manga-downloadr -t
199.69s user 10.30s system 124% cpu 2:48.14 total

37. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
mix.exs

38. mix.exsdefmodule ExMangaDownloadr.Mixfile do
use Mix.Project
def project do
[app: :ex_manga_downloadr,
version: "1.0.1",
elixir: "~> 1.1",
build_embedded: Mix.env == :prod,
start_permanent: Mix.env == :prod,
escript: [main_module: ExMangaDownloadr.CLI],
deps: deps]
end
# Configuration for the OTP application
#
# Type "mix help compile.app" for more information
def application do
[applications: [:logger, :httpotion, :porcelain],
mod: {PoolManagement, []}]
end
defp deps do
[
{:ibrowse, "~> 4.2.2"},
{:httpotion, "~> 3.0.0"},
{:floki, "~> 0.9.0"},
{:porcelain, "~> 2.0.1"},
{:poolboy, "~> 1.5.1"},
{:mock, "~> 0.1.3", only: :test}
]
end
end
PoolManagement

39. PoolManagement
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
pool_management.ex

40. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
pool_management.ex

41. pool_management.exdefmodule PoolManagement do
use Application
def start(_type, _args) do
PoolManagement.Supervisor.start_link
end
end
Supervisor

42. Supervisor
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
supervisor.ex

43. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
supervisor.ex

44. supervisor.exdefmodule PoolManagement.Supervisor do
use Supervisor
def start_link do
Supervisor.start_link(__MODULE__, [])
end
def init([]) do
pool_size = System.get_env("POOL_SIZE") || "50"
pool_options = [
name: {:local, :worker_pool},
worker_module: PoolManagement.Worker,
size: String.to_integer(pool_size),
max_overflow: 0
]
children = [
supervisor(Task.Supervisor, [[name: Fetcher.TaskSupervisor,
strategy: :transient, max_restarts: 10]]),
:poolboy.child_spec(:worker_pool, pool_options, [])
]
supervise(children, strategy: :one_for_one)
end
end
Worker

45. supervisor.exdefmodule PoolManagement.Supervisor do
use Supervisor
def start_link do
Supervisor.start_link(__MODULE__, [])
end
def init([]) do
pool_size = System.get_env("POOL_SIZE") || "50"
pool_options = [
name: {:local, :worker_pool},
worker_module: PoolManagement.Worker,
size: String.to_integer(pool_size),
max_overflow: 0
]
children = [
supervisor(Task.Supervisor, [[name: Fetcher.TaskSupervisor,
strategy: :transient, max_restarts: 10]]),
:poolboy.child_spec(:worker_pool, pool_options, [])
]
supervise(children, strategy: :one_for_one)
end
end
Worker

46. supervisor.exdefmodule PoolManagement.Supervisor do
use Supervisor
def start_link do
Supervisor.start_link(__MODULE__, [])
end
def init([]) do
pool_size = System.get_env("POOL_SIZE") || "50"
pool_options = [
name: {:local, :worker_pool},
worker_module: PoolManagement.Worker,
size: String.to_integer(pool_size),
max_overflow: 0
]
children = [
supervisor(Task.Supervisor, [[name: Fetcher.TaskSupervisor,
strategy: :transient, max_restarts: 10]]),
:poolboy.child_spec(:worker_pool, pool_options, [])
]
supervise(children, strategy: :one_for_one)
end
end
Worker

47. supervisor.exdefmodule PoolManagement.Supervisor do
use Supervisor
def start_link do
Supervisor.start_link(__MODULE__, [])
end
def init([]) do
pool_size = System.get_env("POOL_SIZE") || "50"
pool_options = [
name: {:local, :worker_pool},
worker_module: PoolManagement.Worker,
size: String.to_integer(pool_size),
max_overflow: 0
]
children = [
supervisor(Task.Supervisor, [[name: Fetcher.TaskSupervisor,
strategy: :transient, max_restarts: 10]]),
:poolboy.child_spec(:worker_pool, pool_options, [])
]
supervise(children, strategy: :one_for_one)
end
end
Worker

48. Worker
Supervisor
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
worker.ex

49. Supervisor
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
worker.ex

50. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

51. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

52. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

53. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

54. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

55. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end

56. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files

57. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files

58. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files

59. worker.exdefmodule PoolManagement.Worker do
use GenServer
# Public APIs
def index_page(url, source) do
end
def chapter_page([chapter_link, source]) do
end
def page_image([page_link, source]) do
end
def page_download_image(image_data, directory) do
end
# internal GenServer implementation
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
end
def handle_call({:page_image, page_link, source}, _from, state) do
end
def handle_call({:page_download_image, image_data, directory}, _from, state)
end
## Helper functions
defp manga_source(source, module) do
case source do
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
end
end
defp download_image({image_src, image_filename}, directory) do
end
end
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files

61. POOL

62. defmodule PoolManagement.Worker do
use GenServer
...
def chapter_page([chapter_link, source]) do
Task.Supervisor.async(Fetcher.TaskSupervisor, fn ->
:poolboy.transaction :worker_pool, fn(server) ->
GenServer.call(server, {:chapter_page, chapter_link, source},
@genserver_call_timeout)
end, @task_async_timeout
end)
end
...
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
links = source
|> manga_source("ChapterPage")
|> apply(:pages, [chapter_link])
{:reply, links, state}
end
...
defp manga_source(source, module) do
case source do
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
end
end
end
ChapterPage

63. defmodule PoolManagement.Worker do
use GenServer
...
def chapter_page([chapter_link, source]) do
Task.Supervisor.async(Fetcher.TaskSupervisor, fn ->
:poolboy.transaction :worker_pool, fn(server) ->
GenServer.call(server, {:chapter_page, chapter_link, source},
@genserver_call_timeout)
end, @task_async_timeout
end)
end
...
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
links = source
|> manga_source("ChapterPage")
|> apply(:pages, [chapter_link])
{:reply, links, state}
end
...
defp manga_source(source, module) do
case source do
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
end
end
end
ChapterPage

64. defmodule PoolManagement.Worker do
use GenServer
...
def chapter_page([chapter_link, source]) do
Task.Supervisor.async(Fetcher.TaskSupervisor, fn ->
:poolboy.transaction :worker_pool, fn(server) ->
GenServer.call(server, {:chapter_page, chapter_link, source},
@genserver_call_timeout)
end, @task_async_timeout
end)
end
...
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
links = source
|> manga_source("ChapterPage")
|> apply(:pages, [chapter_link])
{:reply, links, state}
end
...
defp manga_source(source, module) do
case source do
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
end
end
end
ChapterPage

65. defmodule PoolManagement.Worker do
use GenServer
...
def chapter_page([chapter_link, source]) do
Task.Supervisor.async(Fetcher.TaskSupervisor, fn ->
:poolboy.transaction :worker_pool, fn(server) ->
GenServer.call(server, {:chapter_page, chapter_link, source},
@genserver_call_timeout)
end, @task_async_timeout
end)
end
...
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
links = source
|> manga_source("ChapterPage")
|> apply(:pages, [chapter_link])
{:reply, links, state}
end
...
defp manga_source(source, module) do
case source do
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
end
end
end
ChapterPage

66. defmodule PoolManagement.Worker do
use GenServer
...
def chapter_page([chapter_link, source]) do
Task.Supervisor.async(Fetcher.TaskSupervisor, fn ->
:poolboy.transaction :worker_pool, fn(server) ->
GenServer.call(server, {:chapter_page, chapter_link, source},
@genserver_call_timeout)
end, @task_async_timeout
end)
end
...
def handle_call({:chapter_page, chapter_link, source}, _from, state) do
links = source
|> manga_source("ChapterPage")
|> apply(:pages, [chapter_link])
{:reply, links, state}
end
...
defp manga_source(source, module) do
case source do
"mangareader" -> :"Elixir.ExMangaDownloadr.MangaReader.#{module}"
"mangafox" -> :"Elixir.ExMangaDownloadr.Mangafox.#{module}"
end
end
end
ChapterPage

67. defmodule ExMangaDownloadr.Mangafox.ChapterPage do
require Logger
require ExMangaDownloadr
def pages(chapter_link) do
ExMangaDownloadr.fetch chapter_link, do: fetch_pages(chapter_link)
end
defp fetch_pages(html, chapter_link) do
[_page|link_template] = chapter_link |> String.split("/") |>
Enum.reverse
html
|> Floki.find("div[id='top_center_bar'] option")
|> Floki.attribute("value")
|> Enum.reject(fn page_number -> page_number == "0" end)
|> Enum.map(fn page_number ->
["#{page_number}.html"|link_template]
|> Enum.reverse
|> Enum.join("/")
end)
end
end
ChapterPage

68. ChapterPage
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
cli.ex

69. cli.exdefmodule ExMangaDownloadr.CLI do
alias ExMangaDownloadr.Workflow
require ExMangaDownloadr
def main(args) do
args
|> parse_args
|> process
end
...
defp parse_args(args) do
end
defp process(:help) do
end
defp process(directory, url) do
File.mkdir_p!(directory)
File.mkdir_p!("/tmp/ex_manga_downloadr_cache")
manga_name = directory |> String.split("/") |> Enum.reverse |> Enum.at(0)
url
|> Workflow.determine_source
|> Workflow.chapters
|> Workflow.pages
|> Workflow.images_sources
|> Workflow.process_downloads(directory)
|> Workflow.optimize_images
|> Workflow.compile_pdfs(manga_name)
|> finish_process
end
defp process_test(directory, url) do
end
defp finish_process(directory) do
end
end
Workflow

70. Workflow
.
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
workflow.ex

71. workflow.exdefmodule ExMangaDownloadr.Workflow do
alias PoolManagement.Worker
require Logger
def chapters({url, source}) do
end
def pages({chapter_list, source}) do
pages_list = chapter_list
|> Enum.map(&Worker.chapter_page([&1, source]))
|> Enum.map(&Task.await(&1, @await_timeout_ms))
|> Enum.reduce([], fn {:ok, list}, acc -> acc ++ list end)
{pages_list, source}
end
def images_sources({pages_list, source}) do
end
def process_downloads(images_list, directory) do
end
def optimize_images(directory) do
Porcelain.shell("mogrify -resize #{@image_dimensions} #{directory}/*.jpg")
directory
end
def compile_pdfs(directory, manga_name) do
end
end

72. workflow.exdefmodule ExMangaDownloadr.Workflow do
alias PoolManagement.Worker
require Logger
def chapters({url, source}) do
end
def pages({chapter_list, source}) do
pages_list = chapter_list
|> Enum.map(&Worker.chapter_page([&1, source]))
|> Enum.map(&Task.await(&1, @await_timeout_ms))
|> Enum.reduce([], fn {:ok, list}, acc -> acc ++ list end)
{pages_list, source}
end
def images_sources({pages_list, source}) do
end
def process_downloads(images_list, directory) do
end
def optimize_images(directory) do
Porcelain.shell("mogrify -resize #{@image_dimensions} #{directory}/*.jpg")
directory
end
def compile_pdfs(directory, manga_name) do
end
end

73. ex_manga_downloadr —test
28.36s user 15.57s system 33% cpu 2:10.28 total

74. ex_manga_downloadr —test
28.36s user 15.57s system 33% cpu 2:10.28 total

76. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
.
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr

77. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
.
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr

78. File.mkdir_p!(directory)
File.mkdir_p!("/tmp/ex_manga_downloadr_cache")
manga_name = directory |> String.split("/") |> Enum.reverse |> Enum.at(0)
url
|> Workflow.determine_source
|> Workflow.chapters
|> Workflow.pages
|> Workflow.images_sources
|> Workflow.process_downloads(directory)
|> Workflow.optimize_images
|> Workflow.compile_pdfs(manga_name)
|> finish_process
end

79. def run
Dir.mkdir_p @config.download_directory
pipe Steps.fetch_chapters(@config)
.>> Steps.fetch_pages(@config)
.>> Steps.fetch_images(@config)
.>> Steps.download_images(@config)
.>> Steps.optimize_images(@config)
.>> Steps.prepare_volumes(@config)
.>> unwrap
puts "Done!"
end
File.mkdir_p!(directory)
File.mkdir_p!("/tmp/ex_manga_downloadr_cache")
manga_name = directory |> String.split("/") |> Enum.reverse |> Enum.at(0)
url
|> Workflow.determine_source
|> Workflow.chapters
|> Workflow.pages
|> Workflow.images_sources
|> Workflow.process_downloads(directory)
|> Workflow.optimize_images
|> Workflow.compile_pdfs(manga_name)
|> finish_process
end

81. defmodule ExMangaDownloadr.MangaReader.IndexPage do
require Logger
require ExMangaDownloadr
def chapters(manga_root_url) do
ExMangaDownloadr.fetch manga_root_url, do: collect
end
defp collect(html) do
{fetch_manga_title(html), fetch_chapters(html)}
end
defp fetch_manga_title(html) do
html
|> Floki.find("#mangaproperties h1")
|> Floki.text
end
defp fetch_chapters(html) do
html
|> Floki.find("#listing a")
|> Floki.attribute("href")
end
end

82. defmodule ExMangaDownloadr.MangaReader.IndexPage do
require Logger
require ExMangaDownloadr
def chapters(manga_root_url) do
ExMangaDownloadr.fetch manga_root_url, do: collect
end
defp collect(html) do
{fetch_manga_title(html), fetch_chapters(html)}
end
defp fetch_manga_title(html) do
html
|> Floki.find("#mangaproperties h1")
|> Floki.text
end
defp fetch_chapters(html) do
html
|> Floki.find("#listing a")
|> Floki.attribute("href")
end
end

83. defmodule ExMangaDownloadr.MangaReader.IndexPage do
require Logger
require ExMangaDownloadr
def chapters(manga_root_url) do
ExMangaDownloadr.fetch manga_root_url, do: collect
end
defp collect(html) do
{fetch_manga_title(html), fetch_chapters(html)}
end
defp fetch_manga_title(html) do
html
|> Floki.find("#mangaproperties h1")
|> Floki.text
end
defp fetch_chapters(html) do
html
|> Floki.find("#listing a")
|> Floki.attribute("href")
end
end

84. require "./downloadr_client"
require "xml"
module CrMangaDownloadr
class Chapters < DownloadrClient
def initialize(@domain, @root_uri : String, @cache_http = false)
super(@domain, @cache_http)
end
def fetch
html = get(@root_uri)
nodes = html.xpath_nodes(
"//table[contains(@id, 'listing')]//td//a/@href")
nodes.map { |node| node.text.as(String) }
end
end
end
DownloadrClient

85. require "./downloadr_client"
require "xml"
module CrMangaDownloadr
class Chapters < DownloadrClient
def initialize(@domain, @root_uri : String, @cache_http = false)
super(@domain, @cache_http)
end
def fetch
html = get(@root_uri)
nodes = html.xpath_nodes(
"//table[contains(@id, 'listing')]//td//a/@href")
nodes.map { |node| node.text.as(String) }
end
end
end
DownloadrClient

86. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

87. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

88. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

89. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

90. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

91. DownloadrClient
module CrMangaDownloadr
class DownloadrClient
@http_client : HTTP::Client
def initialize(@domain : String, @cache_http = false)
end
def get(uri : String)
cache_path = "/tmp/cr_manga_downloadr_cache/#{cache_filename(uri)}"
while true
begin
response = if @cache_http && File.exists?(cache_path)
body = File.read(cache_path)
HTTP::Client::Response.new(200, body)
else
@http_client.get(uri, headers: HTTP::Headers{
"User-Agent" => CrMangaDownloadr::USER_AGENT })
end
case response.status_code
when 301
uri = response.headers["Location"]
when 200
if @cache_http && !File.exists?(cache_path)
File.open(cache_path, "w") do |f|
f.print response.body
end
end
return XML.parse_html(response.body)
end
rescue IO::Timeout
puts "Sleeping over #{uri}"
sleep 1
end
end
end
end
end

92. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

93. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

94. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

95. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

96. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

97. require "fiberpool"
module CrMangaDownloadr
struct Concurrency
def initialize(@config : Config, @turn_on_engine = true); end
def fetch(collection : Array(A)?, engine_class : E.class,
&block : A, E? -> Array(B)?) : Array(B)
results = [] of B
if collection
pool = Fiberpool.new(collection,
@config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain,
@config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
end
results
end
end
end
fetch
Concurrency

98. fetch
Concurrency
module CrMangaDownloadr
class Workflow
end
module Steps
def self.fetch_chapters(config : Config)
end
def self.fetch_pages(chapters : Array(String)?, config : Config)
puts "Fetching pages from all chapters ..."
reactor = Concurrency.new(config)
reactor.fetch(chapters, Pages) do |link, engine|
engine.try(&.fetch(link))
end
end
def self.fetch_images(pages : Array(String)?, config : Config)
end
def self.download_images(images : Array(Image)?, config : Config)
end
def self.optimize_images(downloads : Array(String), config : Config)
end
def self.prepare_volumes(downloads : Array(String), config : Config)
end
end
end

99. fetch
Concurrency
module CrMangaDownloadr
class Workflow
end
module Steps
def self.fetch_chapters(config : Config)
end
def self.fetch_pages(chapters : Array(String)?, config : Config)
puts "Fetching pages from all chapters ..."
reactor = Concurrency.new(config)
reactor.fetch(chapters, Pages) do |link, engine|
engine.try(&.fetch(link))
end
end
def self.fetch_images(pages : Array(String)?, config : Config)
end
def self.download_images(images : Array(Image)?, config : Config)
end
def self.optimize_images(downloads : Array(String), config : Config)
end
def self.prepare_volumes(downloads : Array(String), config : Config)
end
end
end

101. cr_manga_downloadr -t
0.28s user 0.53s system 0% cpu 1:52.45 total

102. cr_manga_downloadr -t
0.28s user 0.53s system 0% cpu 1:52.45 total

104. .
!"" _build
# $"" ...
!"" config
# $"" config.exs
!"" deps
# !"" ...
!"" ex_manga_downloadr
!"" lib
# !"" ex_manga_downloadr
# # !"" cli.ex
# # !"" mangafox
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" mangareader
# # # !"" chapter_page.ex
# # # !"" index_page.ex
# # # $"" page.ex
# # !"" pool_management
# # # !"" supervisor.ex
# # # $"" worker.ex
# # $"" workflow.ex
# !"" ex_manga_downloadr.ex
# $"" pool_management.ex
!"" mix.exs
!"" mix.lock
!"" README.md
$"" test
!"" ex_manga_downloadr
# !"" mangafox_test.exs
# $"" mangareader_test.exs
!"" ex_manga_downloadr_test.exs
$"" test_helper.exs
61 directories, 281 files
.
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr

105. .
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr
.
!"" bin
# $"" manga-downloadr
!"" Gemfile
!"" Gemfile.lock
!"" lib
# !"" manga-downloadr
# # !"" chapters.rb
# # !"" concurrency.rb
# # !"" downloadr_client.rb
# # !"" image_downloader.rb
# # !"" page_image.rb
# # !"" pages.rb
# # !"" records.rb
# # !"" version.rb
# # $"" workflow.rb
# $"" manga-downloadr.rb
!"" LICENSE.txt
!"" manga-downloadr.gemspec
!"" Rakefile
!"" README.md
$"" spec
!"" fixtures
# !"" ...
!"" manga-downloadr
# !"" chapters_spec.rb
# !"" concurrency_spec.rb
# !"" image_downloader_spec.rb
# !"" page_image_spec.rb
# $"" pages_spec.rb
$"" spec_helper.rb

106. .
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr
.
!"" bin
# $"" manga-downloadr
!"" Gemfile
!"" Gemfile.lock
!"" lib
# !"" manga-downloadr
# # !"" chapters.rb
# # !"" concurrency.rb
# # !"" downloadr_client.rb
# # !"" image_downloader.rb
# # !"" page_image.rb
# # !"" pages.rb
# # !"" records.rb
# # !"" version.rb
# # $"" workflow.rb
# $"" manga-downloadr.rb
!"" LICENSE.txt
!"" manga-downloadr.gemspec
!"" Rakefile
!"" README.md
$"" spec
!"" fixtures
# !"" ...
!"" manga-downloadr
# !"" chapters_spec.rb
# !"" concurrency_spec.rb
# !"" image_downloader_spec.rb
# !"" page_image_spec.rb
# $"" pages_spec.rb
$"" spec_helper.rb

107. .
!"" cr_manga_downloadr
!"" libs
# !"" ...
!"" LICENSE
!"" README.md
!"" shard.lock
!"" shard.yml
!"" spec
# !"" cr_manga_downloadr
# # !"" chapters_spec.cr
# # !"" concurrency_spec.cr
# # !"" image_downloader_spec.cr
# # !"" page_image_spec.cr
# # $"" pages_spec.cr
# !"" fixtures
# # !"" ...
# $"" spec_helper.cr
$"" src
!"" cr_manga_downloadr
# !"" chapters.cr
# !"" concurrency.cr
# !"" downloadr_client.cr
# !"" image_downloader.cr
# !"" page_image.cr
# !"" pages.cr
# !"" records.cr
# !"" version.cr
# $"" workflow.cr
$"" cr_manga_downloadr.cr
.
!"" bin
# $"" manga-downloadr
!"" Gemfile
!"" Gemfile.lock
!"" lib
# !"" manga-downloadr
# # !"" chapters.rb
# # !"" concurrency.rb
# # !"" downloadr_client.rb
# # !"" image_downloader.rb
# # !"" page_image.rb
# # !"" pages.rb
# # !"" records.rb
# # !"" version.rb
# # $"" workflow.rb
# $"" manga-downloadr.rb
!"" LICENSE.txt
!"" manga-downloadr.gemspec
!"" Rakefile
!"" README.md
$"" spec
!"" fixtures
# !"" ...
!"" manga-downloadr
# !"" chapters_spec.rb
# !"" concurrency_spec.rb
# !"" image_downloader_spec.rb
# !"" page_image_spec.rb
# $"" pages_spec.rb
$"" spec_helper.rb

108. def run
Dir.mkdir_p @config.download_directory
pipe Steps.fetch_chapters(@config)
.>> Steps.fetch_pages(@config)
.>> Steps.fetch_images(@config)
.>> Steps.download_images(@config)
.>> Steps.optimize_images(@config)
.>> Steps.prepare_volumes(@config)
.>> unwrap
puts "Done!"
end

109. def self.run(config = Config.new)
FileUtils.mkdir_p config.download_directory
CM(config, Workflow)
.fetch_chapters
.fetch_pages(config)
.fetch_images(config)
.download_images(config)
.optimize_images(config)
.prepare_volumes(config)
.unwrap
puts "Done!"
end
def run
Dir.mkdir_p @config.download_directory
pipe Steps.fetch_chapters(@config)
.>> Steps.fetch_pages(@config)
.>> Steps.fetch_images(@config)
.>> Steps.download_images(@config)
.>> Steps.optimize_images(@config)
.>> Steps.prepare_volumes(@config)
.>> unwrap
puts "Done!"
end

111. # concurrency.cr
pool = Fiberpool.new(collection, @config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain, @config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end

112. # concurrency.cr
pool = Fiberpool.new(collection, @config.download_batch_size)
pool.run do |item|
engine = if @turn_on_engine
engine_class.new(@config.domain, @config.cache_http)
end
if reply = block.call(item, engine)
results.concat(reply)
end
end
pool = Thread.pool(@config.download_batch_size)
mutex = Mutex.new
results = []
collection.each do |item|
pool.process {
engine = @turn_on_engine ? @engine_klass.new(@config.domain, @config.cache_http) : nil
reply = block.call(item, engine)&.flatten
mutex.synchronize do
results += ( reply || [] )
end
}
end
pool.shutdown

113. module CrMangaDownloadr
class Pages < DownloadrClient
def fetch(chapter_link : String)
html = get(chapter_link)
nodes = html.xpath_nodes("//div[@id='selectpage']//select[@id='pageMenu']//option")
nodes.map { |node| "#{chapter_link}/#{node.text}" }
end
end
end

114. module CrMangaDownloadr
class Pages < DownloadrClient
def fetch(chapter_link : String)
html = get(chapter_link)
nodes = html.xpath_nodes("//div[@id='selectpage']//select[@id='pageMenu']//option")
nodes.map { |node| "#{chapter_link}/#{node.text}" }
end
end
end
module MangaDownloadr
class Pages < DownloadrClient
def fetch(chapter_link)
get chapter_link do |html|
nodes = html.xpath("//div[@id='selectpage']//select[@id='pageMenu']//option")
nodes.map { |node| [chapter_link, node.children.to_s].join("/") }
end
end
end
end

115. manga-downloadr -t
16.55s user 6.65s system 17% cpu 2:13.86 total

116. manga-downloadr -t
16.55s user 6.65s system 17% cpu 2:13.86 total

118. Ruby/Typhoeus 124% CPU 2:38 min

119. Ruby/Typhoeus 124% CPU 2:38 min
Elixir 33% CPU 2:10 min

120. Ruby/Typhoeus 124% CPU 2:38 min
Elixir 33% CPU 2:10 min
Crystal 0% CPU 1:52 min

121. Ruby/Typhoeus 124% CPU 2:38 min
Elixir 33% CPU 2:10 min
Crystal 0% CPU 1:52 min
Ruby 17% CPU 2:13 min

123. Ruby Typhoeus libcurl

124. Ruby Typhoeus libcurl
Elixir OTP Poolboy

125. Ruby Typhoeus libcurl
Elixir OTP Poolboy
Crystal Fibers Fiberpool

126. Ruby Typhoeus libcurl
Elixir OTP Poolboy
Crystal Fibers Fiberpool
Ruby Thread Thread/Pool

129. manga-downloadr
ex_manga_downloadr
cr_manga_downloadr

130. manga-downloadr
ex_manga_downloadr
cr_manga_downloadr
fiberpool
cr_chainable_methods
chainable_methods

135. PREMATURE
OPTIMIZATION
The Root of ALL Evil

136. THANKS
@akitaonrails
slideshare.net/akitaonrails