Module: SL::Util

Defined in:
lib/searchlink/util.rb

Overview

Utilities

Class Method Summary collapse

Class Method Details

.cache_file_for(filename) ⇒ String

Get the path for a cache file

Parameters:

  • filename (String) —

    The filename to generate the cache for

Returns:

  • (String) —

    path to new cache file



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# File 'lib/searchlink/util.rb', line 83

def cache_file_for(filename)
  cache_folder = File.expand_path('~/.config/searchlink/cache')
  FileUtils.mkdir_p(cache_folder) unless File.directory?(cache_folder)
  File.join(cache_folder, filename.sub(/(\.cache)?$/, '.cache'))
end

.exec_with_timeout(cmd, timeout) ⇒ String

Execute system command with deadman’s switch

<stackoverflow.com/questions/8292031/ruby-timeouts-and-system-commands> <stackoverflow.com/questions/12189904/fork-child-process-with-timeout-and-capture-output>

Parameters:

  • cmd —

    The command to execute

  • timeout —

    The timeout

Returns:



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# File 'lib/searchlink/util.rb', line 17

def exec_with_timeout(cmd, timeout)
  begin
    # stdout, stderr pipes
    rout, wout = IO.pipe
    rerr, werr = IO.pipe
    stdout, stderr = nil

    pid = Process.spawn(cmd, pgroup: true, out: wout, err: werr)

    Timeout.timeout(timeout) do
      Process.waitpid(pid)

      # close write ends so we can read from them
      wout.close
      werr.close

      stdout = rout.readlines.join
      stderr = rerr.readlines.join
    end
  rescue Timeout::Error
    Process.kill(-9, pid)
    Process.detach(pid)
  ensure
    wout.close unless wout.closed?
    werr.close unless werr.closed?
    # dispose the read ends of the pipes
    rout.close
    rerr.close
  end

  stdout&.strip
end

.search_with_timeout(search, timeout) ⇒ Array

Execute a search with deadman’s switch

Parameters:

  • search (Proc) —

    The search command

  • timeout (Number) —

    The timeout

Returns:

  • (Array) —

    url, title, link_text



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# File 'lib/searchlink/util.rb', line 58

def search_with_timeout(search, timeout)
  url = nil
  title = nil
  link_text = nil

  begin
    Timeout.timeout(timeout) do
      url, title, link_text = search.call
    end
  rescue Timeout::Error
    SL.add_error('Timeout', 'Search timed out')
    url, title, link_text = false
  end

  [url, title, link_text]
end