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# frozen_string_literal: true
class RateLimiter
include Redisable
FAMILIES = {
follows: {
limit: 400,
period: 24.hours.freeze,
}.freeze,
statuses: {
limit: 300,
period: 3.hours.freeze,
}.freeze,
reports: {
limit: 400,
period: 24.hours.freeze,
}.freeze,
}.freeze
def initialize(by, options = {})
@by = by
@family = options[:family]
@limit = FAMILIES[@family][:limit]
@period = FAMILIES[@family][:period].to_i
end
def record!
count = redis.get(key)
if count.nil?
redis.set(key, 0)
redis.expire(key, (@period - (last_epoch_time % @period) + 1).to_i)
end
raise Mastodon::RateLimitExceededError if count.present? && count.to_i >= @limit
redis.incr(key)
end
def rollback!
redis.decr(key)
end
def to_headers(now = Time.now.utc)
{
'X-RateLimit-Limit' => @limit.to_s,
'X-RateLimit-Remaining' => (@limit - (redis.get(key) || 0).to_i).to_s,
'X-RateLimit-Reset' => (now + (@period - (now.to_i % @period))).iso8601(6),
}
end
private
def key
@key ||= "rate_limit:#{@by.id}:#{@family}:#{(last_epoch_time / @period).to_i}"
end
def last_epoch_time
@last_epoch_time ||= Time.now.to_i
end
end
|
