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POShould I be using EM::Synchrony::Multi or EM::Synchrony::FiberIterator with Goliath?
 

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  1. POShould I be using EM::Synchrony::Multi or EM::Synchrony::FiberIterator with Goliath?
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    <p>Maybe this is the wrong approach, but I'm <a href="https://github.com/postrank-labs/goliath/wiki/Asynchronous-Processing" rel="nofollow">trying to parallelize</a> <a href="https://github.com/igrigorik/em-synchrony/blob/master/lib/em-synchrony/em-hiredis.rb" rel="nofollow">em-hiredis</a> puts and lookups in Goliath with <code>EM::Synchrony::Multi</code> or <code>EM::Synchrony::FiberIterator</code>. However, I can't seem to access basic values <a href="https://github.com/postrank-labs/goliath/wiki/Configuration" rel="nofollow">initialized in the config</a>. I keep getting <code>method_missing</code> errors.</p> <p>Here's the basic watered down version of what I'm trying to do:</p> <pre><code>/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." </code></pre> <p>Here's the basic Goliath Setup</p> <pre><code>/try.rb require "goliath" require "em-hiredis" require "em-synchrony/fiber_iterator" require "em-synchrony/em-hiredis" require "em-synchrony/em-multi" class Try &lt; 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 </code></pre> <p>However, I keep getting errors where Goliath doesn't know what <code>user_agent</code> is or <code>redis_db</code> which were initialized in the config.</p> <pre><code>[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 #&lt;Try:0x007ff5a431c4e0 @opts={}&gt; (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' ... ... ... </code></pre> <p>Ideally I'd be able to get <code>FiberIterator</code> working, because I have additional conditionals to check for:</p> <pre><code>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 </code></pre>
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