Class: Rack::MiniProfiler::FileStore

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

Defined Under Namespace

Classes: CacheCleanupThread, FileCache

Constant Summary collapse

EXPIRES_IN_SECONDS = 
60 * 60 * 24

Constants inherited from AbstractStore

AbstractStore::MAX_TOKEN_AGE

Instance Method Summary collapse

Methods inherited from AbstractStore

#diagnostics

Constructor Details

#initialize(args = nil) ⇒ FileStore

Returns a new instance of FileStore.



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
 
# File 'lib/mini_profiler/storage/file_store.rb', line 42

def initialize(args = nil)
  args ||= {}
  @path = args[:path]
  @expires_in_seconds = args[:expires_in] || EXPIRES_IN_SECONDS
  raise ArgumentError.new :path unless @path
  FileUtils.mkdir_p(@path) unless ::File.exist?(@path)

  @timer_struct_cache = FileCache.new(@path, "mp_timers")
  @timer_struct_lock  = Mutex.new
  @user_view_cache    = FileCache.new(@path, "mp_views")
  @user_view_lock     = Mutex.new

  @auth_token_cache    = FileCache.new(@path, "tokens")
  @auth_token_lock     = Mutex.new

  me = self
  t = CacheCleanupThread.new do
    interval = 10
    cleanup_cache_cycle = 3600
    cycle_count = 1

    begin
      until Thread.current[:should_exit] do
        # TODO: a sane retry count before bailing

        # We don't want to hit the filesystem every 10s to clean up the cache so we need to do a bit of
        # accounting to avoid sleeping that entire time.  We don't want to sleep for the entire period because
        # it means the thread will stay live in hot deployment scenarios, keeping a potentially large memory
        # graph from being garbage collected upon undeploy.
        if cycle_count * interval >= cleanup_cache_cycle
          cycle_count = 1
          me.cleanup_cache
        end

        sleep(interval)
        cycle_count += 1
      end
    rescue
      # don't crash the thread, we can clean up next time
    end
  end

  at_exit { t[:should_exit] = true }

  t
end

Instance Method Details

#allowed_tokens ⇒ Object 



138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
 
# File 'lib/mini_profiler/storage/file_store.rb', line 138

def allowed_tokens
  @auth_token_lock.synchronize {
    token1, token2, cycle_at = @auth_token_cache[""]

    unless cycle_at && (Float === cycle_at) && (cycle_at > Process.clock_gettime(Process::CLOCK_MONOTONIC))
      token2 = token1
      token1 = SecureRandom.hex
      cycle_at = Process.clock_gettime(Process::CLOCK_MONOTONIC) + Rack::MiniProfiler::AbstractStore::MAX_TOKEN_AGE
    end

    @auth_token_cache[""] = [token1, token2, cycle_at]

    [token1, token2].compact
  }
end

#cleanup_cache ⇒ Object 



154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
 
# File 'lib/mini_profiler/storage/file_store.rb', line 154

def cleanup_cache
  files = Dir.entries(@path)
  @timer_struct_lock.synchronize {
    files.each do |f|
      f = @path + '/' + f
      ::File.delete f if ::File.basename(f) =~ /^mp_timers/ and (Time.now - ::File.mtime(f)) > @expires_in_seconds
    end
  }
  @user_view_lock.synchronize {
    files.each do |f|
      f = @path + '/' + f
      ::File.delete f if ::File.basename(f) =~ /^mp_views/ and (Time.now - ::File.mtime(f)) > @expires_in_seconds
    end
  }
end

#flush_tokens ⇒ Object 



132
133
134
135
136
 
# File 'lib/mini_profiler/storage/file_store.rb', line 132

def flush_tokens
  @auth_token_lock.synchronize {
    @auth_token_cache[""] = nil
  }
end

#get_unviewed_ids(user) ⇒ Object 



126
127
128
129
130
 
# File 'lib/mini_profiler/storage/file_store.rb', line 126

def get_unviewed_ids(user)
  @user_view_lock.synchronize {
    @user_view_cache[user]
  }
end

#load(id) ⇒ Object 



95
96
97
98
99
 
# File 'lib/mini_profiler/storage/file_store.rb', line 95

def load(id)
  @timer_struct_lock.synchronize {
    @timer_struct_cache[id]
  }
end

#save(page_struct) ⇒ Object 



89
90
91
92
93
 
# File 'lib/mini_profiler/storage/file_store.rb', line 89

def save(page_struct)
  @timer_struct_lock.synchronize {
    @timer_struct_cache[page_struct[:id]] = page_struct
  }
end

#set_all_unviewed(user, ids) ⇒ Object 



120
121
122
123
124
 
# File 'lib/mini_profiler/storage/file_store.rb', line 120

def set_all_unviewed(user, ids)
  @user_view_lock.synchronize {
    @user_view_cache[user] = ids.uniq
  }
end

#set_unviewed(user, id) ⇒ Object 



101
102
103
104
105
106
107
108
 
# File 'lib/mini_profiler/storage/file_store.rb', line 101

def set_unviewed(user, id)
  @user_view_lock.synchronize {
    current = @user_view_cache[user]
    current = [] unless Array === current
    current << id
    @user_view_cache[user] = current.uniq
  }
end

#set_viewed(user, id) ⇒ Object 



110
111
112
113
114
115
116
117
118
 
# File 'lib/mini_profiler/storage/file_store.rb', line 110

def set_viewed(user, id)
  @user_view_lock.synchronize {
    @user_view_cache[user] ||= []
    current = @user_view_cache[user]
    current = [] unless Array === current
    current.delete(id)
    @user_view_cache[user] = current.uniq
  }
end