ruby - 我应该在 Goliath 中使用 EM::Synchrony::Multi 还是 EM::Synchrony::FiberIterator？

Question

也许这是错误的方法，但我是 trying to parallelize em-hiredis使用 EM::Synchrony::Multi 或 EM::Synchrony::FiberIterator 在 Goliath 中放置和查找。但是，我似乎无法访问基本值 initialized in the config .我不断收到 method_missing 错误。

这是我正在尝试做的基本的淡化版本:

/lib/config/try.rb

config['redisUri'] = 'redis://localhost:6379/0'
config['redis_db'] ||= EM::Hiredis.connect
config['user_agent'] = "MyCrawler Mozilla/5.0 Compat etc."

这是歌利亚的基本设置

/try.rb

require "goliath"
require "em-hiredis"
require "em-synchrony/fiber_iterator"
require "em-synchrony/em-hiredis"
require "em-synchrony/em-multi"

class Try < Goliath::API
  use Goliath::Rack::Params
  use Goliath::Rack::DefaultMimeType

  def response(env)
    case env['REQUEST_PATH']
    when "/start" then
      start_crawl()
      body = "STARTING"
      [200, {}, body]
    end 
  end 

  def start_crawl
    urls = ["http://www.example.com/",
      "http://www.example.com/photos/",
      "http://www.example.com/video/",
    ]

    EM::Synchrony::FiberIterator.new(urls, 3).each do |url|
      p "#{user_agent}"
      redis_db.sadd 'test_queue', url
    end

    # multi = EM::Synchrony::Multi.new
    # urls.each_with_index do |url, index|
    #  p "#{user_agent}"
    #  multi.add index, redis_db.sadd('test_queue', url)
    # end
  end
end

但是，我不断收到错误消息，其中 Goliath 不知道 user_agent 是什么，或者 redis_db 是在配置中初始化的。

[936:INFO] 2012-09-21 23:47:10 :: Starting server on 0.0.0.0:9000 in development mode. Watch out for stones.
/Users/ewu/.rvm/gems/ruby-1.9.3-p194@crawler/gems/goliath-1.0.0/lib/goliath/api.rb:143:in `method_missing': undefined local variable or method `user_agent' for #<Try:0x007ff5a431c4e0 @opts={}> (NameError)
from ./lib/try.rb:27:in `block in start_crawl'
from /Users/ewu/.rvm/gems/ruby-1.9.3-p194@crawler/gems/em-synchrony-1.0.2/lib/em-synchrony/fiber_iterator.rb:10:in `call'
from /Users/ewu/.rvm/gems/ruby-1.9.3-p194@crawler/gems/em-synchrony-1.0.2/lib/em-synchrony/fiber_iterator.rb:10:in `block (2 levels) in each'
...
...
...

理想情况下，我能够让 FiberIterator 正常工作，因为我有额外的条件要检查:

EM::Synchrony::FiberIterator.new(urls, 3).each do |new_url}
  is_member = redis_db.sismember('crawled_urls', new_url)
  is_member += redis_db.sismember('queued_urls', new_url)
  if is_member == 0
    redis_db.lpush 'crawl_queue', new_url
    redis_db.sadd 'queued_urls', new_url
  end
end

Answer 1

我认为您的配置文件没有加载。 try.rb的名字需要和config目录下的robojin.rb文件的名字一致。