old_contents: #!/usr/bin/env python
  
  """
  Rate Limiting for RED, the Resource Expert Droid.
  """
  
  from collections import defaultdict
  
  import thor.loop
  
  
  class RateLimiter:
      limits = {}
      counts = {}
      periods = {}
      watching = set()
  
      def __init__(self) -> None:
          self.loop = thor.loop
  
      def setup(self, metric_name: str, limit: int, period: int) -> None:
          """
          Set up a metric with a limit and a period.
          Can be called multiple times.
          """
          if not metric_name in self.watching:
              self.limits[metric_name] = limit
              self.counts[metric_name] = defaultdict(int)
              self.periods[metric_name] = period
              self.loop.schedule(period, self.clear, metric_name)
              self.watching.add(metric_name)
  
      def increment(self, metric_name, discriminator) -> None:
          """
          Increment a metric for a discriminator.
          If the metric isn't set up, it will be ignored.
          Raises RateLimitViolation if this discriminator is over the limit.
          """
          if not metric_name in self.watching:
              return
          self.counts[metric_name][discriminator] += 1
          if self.counts[metric_name][discriminator] > self.limits[metric_name]:
              raise RateLimitViolation
  
      def clear(self, metric_name):
          """
          Clear a metric's counters.
          """
          self.counts[metric_name] = defaultdict(int)
          self.loop.schedule(self.periods[metric_name], self.clear, metric_name)
  
  
  ratelimiter = RateLimiter()
  
  
  class RateLimitViolation(Exception):
      pass
  
new_contents: #!/usr/bin/env python
  
  """
  Rate Limiting for RED, the Resource Expert Droid.
  """
  
  from collections import defaultdict
  from typing import Dict, Set
  
  import thor.loop
  
  
  class RateLimiter:
      limits = {}  # type: Dict[str, int]
      counts = {}  # type: Dict[str, Dict[str, int]]
      periods = {} # type: Dict[str, int]
      watching = set() # type: Set[str]
  
      def __init__(self) -> None:
          self.loop = thor.loop
  
      def setup(self, metric_name: str, limit: int, period: int) -> None:
          """
          Set up a metric with a limit and a period.
          Can be called multiple times.
          """
          if not metric_name in self.watching:
              self.limits[metric_name] = limit
              self.counts[metric_name] = defaultdict(int)
              self.periods[metric_name] = period
              self.loop.schedule(period, self.clear, metric_name)
              self.watching.add(metric_name)
  
      def increment(self, metric_name: str, discriminator: str) -> None:
          """
          Increment a metric for a discriminator.
          If the metric isn't set up, it will be ignored.
          Raises RateLimitViolation if this discriminator is over the limit.
          """
          if not metric_name in self.watching:
              return
          self.counts[metric_name][discriminator] += 1
          if self.counts[metric_name][discriminator] > self.limits[metric_name]:
              raise RateLimitViolation
  
      def clear(self, metric_name: str) -> None:
          """
          Clear a metric's counters.
          """
          self.counts[metric_name] = defaultdict(int)
          self.loop.schedule(self.periods[metric_name], self.clear, metric_name)
  
  
  ratelimiter = RateLimiter()
  
  
  class RateLimitViolation(Exception):
      pass
  
subject: add types to ratelimit