In RoR, how do I recover from a “Failed to open TCP connection … (general SOCKS server failure)” error?

问题

I’m using Rails 4.2.7. Currently Im’ requesting web pages through a SOCKS proxy like so

begin
   ...
    res1 = Net::HTTP.SOCKSProxy('127.0.0.1', 50001).start(uri.host, uri.port) do |http|
      puts "launching #{uri}"
      resp = http.get(uri)
      status = resp.code
      content = resp.body
      content_type = resp['content-type']
      content_encoding = resp['content-encoding']
    end
  ...
rescue OpenURI::HTTPError => ex
   ...
rescue SocketError, Net::OpenTimeout, Zlib::BufError => e
   ...
end

and occasionally I will get the following error ..

Error during processing: Failed to open TCP connection to otherwebsite.com:80 (general SOCKS server failure)
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:882:in `rescue in block in connect'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:879:in `block in connect'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/timeout.rb:91:in `block in timeout'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/timeout.rb:101:in `timeout'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:878:in `connect'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:863:in `do_start'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:852:in `start'
/Users/mikeb/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/net/http.rb:584:in `start'
/Users/mikeb/Documents/workspace/runtrax/app/helpers/webpage_helper.rb:96:in `get_content'
/Users/mikeb/Documents/workspace/runtrax/app/helpers/webpage_helper.rb:32:in `get_url'
/Users/mikeb/Documents/workspace/runtrax/app/services/onlinerr_race_finder_service.rb:42:in `get_race_list'
/Users/mikeb/Documents/workspace/runtrax/app/services/abstract_race_finder_service.rb:26:in `process_data'
/Users/mikeb/Documents/workspace/runtrax/app/services/run_crawlers_service.rb:18:in `block in run_all_crawlers'
/Users/mikeb/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/relation/delegation.rb:46:in `each'
/Users/mikeb/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/relation/delegation.rb:46:in `each'

How do I catch this error and retry my request?

Edit: How is my question different than what was asked? The duplicate is referring to a buffer error, this quesiton deals with a socket error.

回答1:

You can retry:

retries = 0
begin
  res1 = Net::HTTP.SOCKSProxy('127.0.0.1', 50001).start(uri.host, uri.port) do |http|
    puts "launching #{uri}"
    resp = http.get(uri)
    status = resp.code
    content = resp.body
    content_type = resp['content-type']
    content_encoding = resp['content-encoding']
  end
rescue => e
  retries += 1
  if retries < 3
    retry # <-- Jumps to begin
  else
    # Error handling code, e.g.
    logger.warn "Couldn't connect to proxy: #{e}"
  end
end

来源：https://stackoverflow.com/questions/39965192/in-ror-how-do-i-recover-from-a-failed-to-open-tcp-connection-general-sock