Class: Mantle::CatchUp

Inherits:
Object
  • Object
show all
Defined in:
lib/mantle/catch_up.rb

Constant Summary collapse

KEY = 
"mantle:catch_up"
HOURS_TO_KEEP = 
1
CLEANUP_EVERY_MINUTES = 
5

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CatchUp

Returns a new instance of CatchUp.



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# File 'lib/mantle/catch_up.rb', line 10

def initialize
  @redis = Mantle.configuration.message_bus_redis
  @message_bus_channels = Mantle.channels
  @key = KEY
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/mantle/catch_up.rb', line 8

def key
  @key
end

#message_bus_channels ⇒ Object

Returns the value of attribute message_bus_channels.



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# File 'lib/mantle/catch_up.rb', line 7

def message_bus_channels
  @message_bus_channels
end

#redis ⇒ Object

Returns the value of attribute redis.



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# File 'lib/mantle/catch_up.rb', line 7

def redis
  @redis
end

Instance Method Details

#add_message(channel, message, now = Time.now.utc.to_f) ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 16

def add_message(channel, message, now = Time.now.utc.to_f)
  json = serialize_payload(channel, message)
  redis.zadd(key, now, json)
  Mantle.logger.debug("Added message to catch up list for channel: #{channel}")
  now
end

#catch_up ⇒ Object

Raises:



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# File 'lib/mantle/catch_up.rb', line 38

def catch_up
  raise Mantle::Error::MissingRedisConnection unless redis

  if last_success_time.nil?
    Mantle.logger.info("Skipping catch up because of missing last processed time...")
    return
  end

  Mantle.logger.info("Catching up from time: #{last_success_time}")

  payloads_with_time = redis.zrangebyscore(key, last_success_time, 'inf', with_scores: true)
  route_messages(payloads_with_time) if payloads_with_time.any?
end

#clear_expired ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 33

def clear_expired
  max_time_to_clear = hours_ago_in_seconds(HOURS_TO_KEEP)
  redis.zremrangebyscore(key, 0, max_time_to_clear)
end

#deserialize_payload(payload) ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 67

def deserialize_payload(payload)
  JSON(payload).values_at 'channel', 'message'
end

#enqueue_clear_if_ready ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 23

def enqueue_clear_if_ready
  now = Time.now.utc.to_f
  five_minutes_ago = now - (CLEANUP_EVERY_MINUTES * 60.0)
  last_cleanup = Mantle::LocalRedis.last_catch_up_cleanup_at

  if last_cleanup.nil? || last_cleanup < five_minutes_ago
    Mantle::Workers::CatchUpCleanupWorker.perform_async
  end
end

#hours_ago_in_seconds(hours) ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 71

def hours_ago_in_seconds(hours)
  hour_seconds = 60 * 60 * hours
  Time.now.utc.to_f - hour_seconds
end

#last_success_time ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 52

def last_success_time
  LocalRedis.last_message_successfully_received_at
end

#route_messages(payloads_with_time) ⇒ Object 



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# File 'lib/mantle/catch_up.rb', line 56

def route_messages(payloads_with_time)
  payloads_with_time.each do |payload_with_time|
    payload, time = payload_with_time
    channel, message = deserialize_payload(payload)

    if message_bus_channels.include?(channel)
      Mantle::MessageRouter.new(channel, message).route
    end
  end
end