/usr/lib/ruby/vendor_ruby/rack/cache/entitystore.rb is in ruby-rack-cache 1.2-4.
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module Rack::Cache
# Entity stores are used to cache response bodies across requests. All
# Implementations are required to calculate a SHA checksum of the data written
# which becomes the response body's key.
class EntityStore
# Read body calculating the SHA1 checksum and size while
# yielding each chunk to the block. If the body responds to close,
# call it after iteration is complete. Return a two-tuple of the form:
# [ hexdigest, size ].
def slurp(body)
digest, size = Digest::SHA1.new, 0
body.each do |part|
size += bytesize(part)
digest << part
yield part
end
body.close if body.respond_to? :close
[digest.hexdigest, size]
end
if ''.respond_to?(:bytesize)
def bytesize(string); string.bytesize; end
else
def bytesize(string); string.size; end
end
private :slurp, :bytesize
# Stores entity bodies on the heap using a Hash object.
class Heap < EntityStore
# Create the store with the specified backing Hash.
def initialize(hash={})
@hash = hash
end
# Determine whether the response body with the specified key (SHA1)
# exists in the store.
def exist?(key)
@hash.include?(key)
end
# Return an object suitable for use as a Rack response body for the
# specified key.
def open(key)
(body = @hash[key]) && body.dup
end
# Read all data associated with the given key and return as a single
# String.
def read(key)
(body = @hash[key]) && body.join
end
# Write the Rack response body immediately and return the SHA1 key.
def write(body, ttl=nil)
buf = []
key, size = slurp(body) { |part| buf << part }
@hash[key] = buf
[key, size]
end
# Remove the body corresponding to key; return nil.
def purge(key)
@hash.delete(key)
nil
end
def self.resolve(uri)
new
end
end
HEAP = Heap
MEM = Heap
# Stores entity bodies on disk at the specified path.
class Disk < EntityStore
# Path where entities should be stored. This directory is
# created the first time the store is instansiated if it does not
# already exist.
attr_reader :root
def initialize(root)
@root = root
FileUtils.mkdir_p root, :mode => 0755
end
def exist?(key)
File.exist?(body_path(key))
end
def read(key)
File.open(body_path(key), 'rb') { |f| f.read }
rescue Errno::ENOENT
nil
end
class Body < ::File #:nodoc:
def each
while part = read(8192)
yield part
end
end
alias_method :to_path, :path
end
# Open the entity body and return an IO object. The IO object's
# each method is overridden to read 8K chunks instead of lines.
def open(key)
Body.open(body_path(key), 'rb')
rescue Errno::ENOENT
nil
end
def write(body, ttl=nil)
filename = ['buf', $$, Thread.current.object_id].join('-')
temp_file = storage_path(filename)
key, size =
File.open(temp_file, 'wb') { |dest|
slurp(body) { |part| dest.write(part) }
}
path = body_path(key)
if File.exist?(path)
File.unlink temp_file
else
FileUtils.mkdir_p File.dirname(path), :mode => 0755
FileUtils.mv temp_file, path
end
[key, size]
end
def purge(key)
File.unlink body_path(key)
nil
rescue Errno::ENOENT
nil
end
protected
def storage_path(stem)
File.join root, stem
end
def spread(key)
key = key.dup
key[2,0] = '/'
key
end
def body_path(key)
storage_path spread(key)
end
def self.resolve(uri)
path = File.expand_path(uri.opaque || uri.path)
new path
end
end
DISK = Disk
FILE = Disk
# Base class for memcached entity stores.
class MemCacheBase < EntityStore
# The underlying Memcached instance used to communicate with the
# memcached daemon.
attr_reader :cache
extend Rack::Utils
def open(key)
data = read(key)
data && [data]
end
def self.resolve(uri)
if uri.respond_to?(:scheme)
server = "#{uri.host}:#{uri.port || '11211'}"
options = parse_query(uri.query)
options.keys.each do |key|
value =
case value = options.delete(key)
when 'true' ; true
when 'false' ; false
else value.to_sym
end
options[key.to_sym] = value
end
options[:namespace] = uri.path.sub(/^\//, '')
new server, options
else
# if the object provided is not a URI, pass it straight through
# to the underlying implementation.
new uri
end
end
end
# Uses the Dalli ruby library. This is the default unless
# the memcached library has already been required.
class Dalli < MemCacheBase
def initialize(server="localhost:11211", options={})
@cache =
if server.respond_to?(:stats)
server
else
require 'dalli'
::Dalli::Client.new(server, options)
end
end
def exist?(key)
!cache.get(key).nil?
end
def read(key)
data = cache.get(key)
data.force_encoding('BINARY') if data.respond_to?(:force_encoding)
data
end
def write(body, ttl=nil)
buf = StringIO.new
key, size = slurp(body){|part| buf.write(part) }
[key, size] if cache.set(key, buf.string, ttl)
end
def purge(key)
cache.delete(key)
nil
end
end
# Uses the memcached client library. The ruby based memcache-client is used
# in preference to this store unless the memcached library has already been
# required.
class MemCached < MemCacheBase
def initialize(server="localhost:11211", options={})
options[:prefix_key] ||= options.delete(:namespace) if options.key?(:namespace)
@cache =
if server.respond_to?(:stats)
server
else
require 'memcached'
::Memcached.new(server, options)
end
end
def exist?(key)
cache.append(key, '')
true
rescue ::Memcached::NotStored
false
end
def read(key)
cache.get(key, false)
rescue ::Memcached::NotFound
nil
end
def write(body, ttl=0)
buf = StringIO.new
key, size = slurp(body){|part| buf.write(part) }
cache.set(key, buf.string, ttl, false)
[key, size]
end
def purge(key)
cache.delete(key)
nil
rescue ::Memcached::NotFound
nil
end
end
MEMCACHE =
if defined?(::Memcached)
MemCached
else
Dalli
end
MEMCACHED = MEMCACHE
class GAEStore < EntityStore
attr_reader :cache
def initialize(options = {})
require 'rack/cache/appengine'
@cache = Rack::Cache::AppEngine::MemCache.new(options)
end
def exist?(key)
cache.contains?(key)
end
def read(key)
cache.get(key)
end
def open(key)
if data = read(key)
[data]
else
nil
end
end
def write(body, ttl=nil)
buf = StringIO.new
key, size = slurp(body){|part| buf.write(part) }
cache.put(key, buf.string, ttl)
[key, size]
end
def purge(key)
cache.delete(key)
nil
end
def self.resolve(uri)
self.new(:namespace => uri.host)
end
end
GAECACHE = GAEStore
GAE = GAEStore
end
end
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