Class: FaradayDynamicTimeout::Middleware

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/faraday_dynamic_timeout/middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/faraday_dynamic_timeout/middleware.rb', line 5

def initialize(*)
  super

  @redis_client = option(:redis)
  if @redis_client.nil? && !(options.include?(:redis) || options.include?("redis"))
    @redis_client = Redis.new
  end

  @memoized_buckets = []
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/faraday_dynamic_timeout/middleware.rb', line 16

def call(env)
  # A Redis outage must never take down HTTP traffic, so if building the bucket
  # configuration touches Redis (e.g. a capacity based strategy) and it is
  # unavailable, fail open and let the request through with no dynamic timeout.
  buckets = safe_redis { sorted_buckets }
  redis = redis_client
  return app.call(env) if !enabled?(env) || buckets.nil? || buckets.empty? || redis.nil?

  error = nil
  bucket_timeout = nil
  callback = option(:callback)
  start_time = monotonic_time if callback

  count_request(env.url, redis, buckets, callback) do |request_count|
    execute_with_timeout(env.url, buckets, request_count, redis) do |timeout|
      bucket_timeout = timeout
      set_timeout(env, timeout) if timeout

      # Resetting the start time to more accurately reflect the time spent in the request.
      start_time = monotonic_time if callback
      app.call(env)
    end
  rescue => e
    error = e
    raise
  ensure
    if callback
      duration = monotonic_time - start_time
      request_info = RequestInfo.new(env: env, duration: duration, timeout: bucket_timeout, request_count: request_count, error: error)
      callback.call(request_info)
    end
  end
end