Class: LibyearRb::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/libyear_rb/runner.rb

Constant Summary collapse

MAX_WORKERS_PER_HOST = 
10
RATE_LIMIT =

requests per second per host

10

Instance Method Summary collapse

Instance Method Details

#run(lockfile_contents, as_of: nil) ⇒ Object 



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# File 'lib/libyear_rb/runner.rb', line 10

def run(lockfile_contents, as_of: nil)
  specs_by_host = parse_specs(lockfile_contents)
  threads = []
  replenishers = []

  specs_by_host.each do |host, specs|
    token_queue = Thread::SizedQueue.new(RATE_LIMIT)
    rate_limiter = -> { token_queue.pop }

    work_queue = Thread::Queue.new
    specs.each { |spec| work_queue << spec }
    work_queue.close

    replenishers << Thread.new do
      loop do
        sleep(1.0 / RATE_LIMIT)
        token_queue << :token
      end
    end

    [specs.size, MAX_WORKERS_PER_HOST].min.times do
      threads << Thread.new do
        fetcher = GemInfoFetcher.new(host, rate_limiter: rate_limiter)
        thread_results = []
        while (spec = work_queue.pop)
          begin
            versions = fetcher.versions_for(spec.name)
            thread_results << [spec, versions]
          rescue => e
            LibyearRb.logger.error("Error fetching #{spec.name}: #{e.message}")
          end
        end
        thread_results
      end
    end
  end

  spec_versions = threads.flat_map(&:value)
  spec_versions.filter_map { |spec, versions| analyze(spec, versions, as_of: as_of) }
rescue Exception # rubocop:disable Lint/RescueException
  threads.each { |t| t.kill unless t == Thread.current }
  raise
ensure
  replenishers.each(&:kill)
end