Class: Sinatra::RedisCache::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/sinatra/redis-cache.rb

Instance Method Summary collapse

Instance Method Details

#all_keys(params = {with_namespace: true}) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 100

def all_keys(params={with_namespace: true})
  redis.keys("#{namespace}:*").map{|k| params[:with_namespace] ? k : key_without_namespace(k) }
end

#del(keys) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 104

def del(keys)
  debug_log "del #{keys.map{|k| key_without_namespace(k)}}"
  redis.del(keys)
end

#do(key, expires = config.default_expires, block) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 32

def do(key, expires=config.default_expires, block)
  debug_log "do #{key_without_namespace(key)}"
  if Sinatra::RedisCache::Config.environments.include? Sinatra::Base.settings.environment
    try = 0
    begin
      redis.watch(key = key_with_namespace(key)) do |watched|
        object = get(key)
        unless object.empty?
          if object['locked']
            raise SinatraRedisCacheKeyLocked
          end
          object['object']
        else
          lock_key(key, watched, config.lock_timeout)
          new_object = block.call
          store(key, new_object, expires)
          new_object
        end
      end
    rescue SinatraRedisCacheKeyLocked
      sleeptime = (((try += 1)*50 + rand(100).to_f)/1000)
      debug_log "key is locked, waiting #{sleeptime}s for retry ##{try}."
      sleep sleeptime
      retry
    rescue SinatraRedisCacheKeyAlreadyLocked
      sleeptime = (((try += 1)*50 + rand(100).to_f)/1000)
      debug_log "failed to obtain lock, waiting #{sleeptime}s for retry ##{try}."
      sleep sleeptime
      retry
    end
  else
    # Just run the block without cache if we're not in an allowed environment
    block.call
  end
end

#flush ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 109

def flush
  unless (keys = all_keys).empty?
    del(keys)
  end
end

#get(key) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 68

def get(key)
  debug_log "get #{key_without_namespace(key)}"
  unless (hash = redis.hgetall(key_with_namespace(key))).nil?
    hash.each{|k,v| hash[k]=deserialize(v)}
  else
    false
  end
end

#properties(key) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 90

def properties(key)
  unless (string = redis.hget(key_with_namespace(key), 'properties')).nil?
    deserialize(string)
  end
end

#store(key, object, expires = config.default_expires) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 77

def store(key, object, expires=config.default_expires)
  debug_log "store #{key_without_namespace(key)}"
  properties = { created_at: Time.now.utc.to_i }
  redis.watch(key = key_with_namespace(key)) do |watched|
    watched.multi do |multi|
      multi.hset(key, 'object',     serialize(object))
      multi.hset(key, 'properties', serialize(properties))
      multi.hdel(key, 'locked')
      multi.expire(key, expires)
    end
  end
end

#ttl(key) ⇒ Object 



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# File 'lib/sinatra/redis-cache.rb', line 96

def ttl(key)
  redis.ttl(key_with_namespace(key))
end