Class: Fluent::Plugin::MemcachedStorage

Inherits:
Storage
  • Object
show all
Defined in:
lib/fluent/plugin/storage_memcached.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MemcachedStorage

Returns a new instance of MemcachedStorage.



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# File 'lib/fluent/plugin/storage_memcached.rb', line 24

def initialize
  super

  @store = {}
end

Instance Attribute Details

#store ⇒ Object (readonly)

for test



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# File 'lib/fluent/plugin/storage_memcached.rb', line 22

def store
  @store
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 30

def configure(conf)
  super

  unless @path
    if conf && !conf.arg.empty?
      @path = conf.arg
    else
      raise Fluent::ConfigError, "path or conf.arg for <storage> is required."
    end
  end

  @serializer = case @serializer
               when :yajl
                 Yajl
               when :json
                 JSON
               when :marshal
                 Marshal
               end

  options = {
    threadsafe: true,
    namespace: @namespace,
    compress: @compress,
    serializer: @serializer,
    expires_in: @expires_in,
    failover: @failover
  }
  options[:username] = @username if @username
  options[:password] = @password if @password

  @memcached = Dalli::Client.new(@hosts, options)

  object = @memcached.get(@path)
  if object
    begin
      data = @serializer.load(object)
      raise Fluent::ConfigError, "Invalid contents (not object) in plugin memcached storage: '#{@path}'" unless data.is_a?(Hash) unless data.is_a?(Hash)
    rescue => e
      log.error "failed to read data from plugin memcached storage", path: @path, error: e
      raise Fluent::ConfigError, "Unexpected error: failed to read data from plugin memcached storage: '#{@path}'"
    end
  end
end

#delete(key) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 119

def delete(key)
  @store.delete(key.to_s)
end

#fetch(key, defval) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 111

def fetch(key, defval)
  @store.fetch(key.to_s, defval)
end

#get(key) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 107

def get(key)
  @store[key.to_s]
end

#load ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 83

def load
  begin
    json_string = @memcached.get(@path)
    json = @serializer.load(json_string)
    unless json.is_a?(Hash)
      log.error "broken content for plugin storage (Hash required: ignored)", type: json.class
      log.debug "broken content", content: json_string
      return
    end
    @store = json
  rescue => e
    log.error "failed to load data for plugin storage from memcached", path: @path, error: e
  end
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/storage_memcached.rb', line 75

def multi_workers_ready?
  true
end

#persistent_always? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/storage_memcached.rb', line 79

def persistent_always?
  true
end

#put(key, value) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 115

def put(key, value)
  @store[key.to_s] = value
end

#save ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 98

def save
  begin
    json_string = @serializer.dump(@store)
    @memcached.set(@path, json_string)
  rescue => e
    log.error "failed to save data for plugin storage to memcached", path: @path, error: e
  end
end

#update(key, &block) ⇒ Object 



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# File 'lib/fluent/plugin/storage_memcached.rb', line 123

def update(key, &block)
  @store[key.to_s] = block.call(@store[key.to_s])
end