Class: Rack::MiniProfiler::MemcacheStore

Inherits:
AbstractStore show all
Defined in:
lib/mini_profiler/storage/memcache_store.rb

Constant Summary collapse

EXPIRES_IN_SECONDS = 
60 * 60 * 24
MAX_RETRIES = 
10

Constants inherited from AbstractStore

AbstractStore::MAX_TOKEN_AGE

Instance Method Summary collapse

Methods inherited from AbstractStore

#diagnostics

Constructor Details

#initialize(args = nil) ⇒ MemcacheStore

Returns a new instance of MemcacheStore.



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 8

def initialize(args = nil)
  require 'dalli' unless defined? Dalli
  args ||= {}
  @prefix             = args[:prefix]     || "MPMemcacheStore"
  @prefix             += "-#{Rack::MiniProfiler::VERSION}"
  @client             = args[:client]     || Dalli::Client.new
  @expires_in_seconds = args[:expires_in] || EXPIRES_IN_SECONDS
end

Instance Method Details

#allowed_tokens ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 58

def allowed_tokens

  token_info = @client.get("#{@prefix}-tokens")
  key1, key2, cycle_at = nil


  if token_info
     key1, key2, cycle_at = Marshal::load(token_info)

     key1 = nil unless key1 && key1.length == 32
     key2 = nil unless key2 && key2.length == 32

     if key1 && cycle_at && (cycle_at > Time.now)
        return [key1,key2].compact
     end
  end

  timeout = Rack::MiniProfiler::AbstractStore::MAX_TOKEN_AGE

  # cycle keys
  key2 = key1
  key1 = SecureRandom.hex
  cycle_at = Time.now + timeout

  @client.set("#{@prefix}-tokens", Marshal::dump([key1, key2, cycle_at]))

  [key1, key2].compact
end

#flush_tokens ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 54

def flush_tokens
  @client.set("#{@prefix}-tokens", nil)
end

#get_unviewed_ids(user) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 50

def get_unviewed_ids(user)
  @client.get("#{@prefix}-#{user}-v") || []
end

#load(id) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 21

def load(id)
  raw = @client.get("#{@prefix}#{id}")
  Marshal::load(raw) if raw
end

#save(page_struct) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 17

def save(page_struct)
  @client.set("#{@prefix}#{page_struct[:id]}", Marshal::dump(page_struct), @expires_in_seconds)
end

#set_all_unviewed(user, ids) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 46

def set_all_unviewed(user, ids)
  @client.set("#{@prefix}-#{user}-v", ids, @expires_in_seconds)
end

#set_unviewed(user, id) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 26

def set_unviewed(user, id)
  @client.add("#{@prefix}-#{user}-v", [], @expires_in_seconds)
  MAX_RETRIES.times do
    break if @client.cas("#{@prefix}-#{user}-v", @expires_in_seconds) do |ids|
      ids << id unless ids.include?(id)
      ids
    end
  end
end

#set_viewed(user, id) ⇒ Object 



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# File 'lib/mini_profiler/storage/memcache_store.rb', line 36

def set_viewed(user, id)
  @client.add("#{@prefix}-#{user}-v", [], @expires_in_seconds)
  MAX_RETRIES.times do
    break if @client.cas("#{@prefix}-#{user}-v", @expires_in_seconds) do |ids|
      ids.delete id
      ids
    end
  end
end