Rate Limiting Ruby

  • Posted on December 8, 2007

I have decommissioned my old blog at gregspurrier.com, but, from time to time, I will re-post here some of my favorite articles from there. This article was originally posted on September 27, 2006.

My software is too fast! That’s not a frequent lament heard from programmers. Sometimes it’s true, though, and it can be just as big of a deal as when things are moving too slowly.

I found myself in this situation a couple of months ago in my work at My Digital Life. I was building a demo that integrated our platform with the web services API of a popular music site. The API’s terms of service required that requests be limited to no more than one per second. Without putting safeguards in place, our platform easily would have violated that constraint.

Ensuring that a portion of code is executed at no more than a maximum rate is not necessarily challenging, and I’d done it many times in the past. This was the first time I’d tackled the problem with Ruby, though, and I was pleased with the elegance of the solution.

The code below is the RateLimiter class that I ended up with:

class RateLimiter
  # Create a new rate limiter object that will ensure that actions are
  # executed with at least the specified minimum elapsed time between
  # successive invocations (specified in seconds or fractions thereof)
  def initialize(min_elapsed_time)
    @period = min_elapsed_time.to_f
    @last_fired = Time.now.to_f - @period
  end

  # Execute the given block of code.  If the time elapsed since the
  # last call is not sufficient to honor the rate limiter's configured
  # minimum interarrival period, the method will first block for 
  # an appropriate amount of time.
  #
  # The block's value is returned as the result.
  def limited(&block)
    # Make sure that we're obeying the limit
    now = Time.now.to_f
    if now - @last_fired < @period
      sleep @period - (now - @last_fired)
    end

    @last_fired = Time.now.to_f
    yield      
  end
end

Any code that must be rate-limited is simply passed as a block to the object’s limited() method. For example:

# Limit to once per second
rl = RateLimiter.new(1.0)
5.times do
  rl.limited do
    puts Time.now.to_s
  end
end

yields the result:

    Wed Sep 27 15:23:24 PDT 2006
    Wed Sep 27 15:23:25 PDT 2006
    Wed Sep 27 15:23:26 PDT 2006
    Wed Sep 27 15:23:27 PDT 2006
    Wed Sep 27 15:23:28 PDT 2006

The same RateLimiter instance can be used to guard multiple blocks of code that all access the same constrained resource.

The beauty of this approach is that it separates the mechanics of rate limiting from the code that is being throttled. Tomorrow I could change the RateLimiter class to allow rapid bursts of activity while still maintaining one request per second on average and I wouldn’t have to change a line of code in the application.

Things like this are why programming in Ruby frequently makes me smile.

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