Deprecate Rack::Session::Memcache in favor of Rack::Session::Dalli from dalli gem

4 files changed, 6 insertions, 416 deletions

diff --git a/Gemfile b/Gemfile
index b9d9d748..62a3494e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,7 +20,7 @@ gem "rubocop", "0.68.1", require: false
 
 group :extra do
   gem 'fcgi', platforms: c_platforms
-  gem 'memcache-client'
+  gem 'dalli'
   gem 'thin', platforms: c_platforms
 end
 
diff --git a/README.rdoc b/README.rdoc
index 0bd08a2d..74a902f4 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -145,11 +145,11 @@ installation and bacon.
 To run the test suite completely, you need:
 
   * fcgi
-  * memcache-client
+  * dalli
   * thin
 
 To test Memcache sessions, you need memcached (will be
-run on port 11211) and memcache-client installed.
+run on port 11211) and dalli installed.
 
 == Configuration
 
diff --git a/lib/rack/session/memcache.rb b/lib/rack/session/memcache.rb
index dd587633..6a601174 100644
--- a/lib/rack/session/memcache.rb
+++ b/lib/rack/session/memcache.rb
@@ -1,98 +1,10 @@
 # frozen_string_literal: true
 
-# AUTHOR: blink <blinketje@gmail.com>; blink#ruby-lang@irc.freenode.net
-
-require 'rack/session/abstract/id'
-require 'memcache'
-require 'rack/core_ext/regexp'
+require 'rack/session/dalli'
 
 module Rack
   module Session
-    # Rack::Session::Memcache provides simple cookie based session management.
-    # Session data is stored in memcached. The corresponding session key is
-    # maintained in the cookie.
-    # You may treat Session::Memcache as you would Session::Pool with the
-    # following caveats.
-    #
-    # * Setting :expire_after to 0 would note to the Memcache server to hang
-    #   onto the session data until it would drop it according to it's own
-    #   specifications. However, the cookie sent to the client would expire
-    #   immediately.
-    #
-    # Note that memcache does drop data before it may be listed to expire. For
-    # a full description of behaviour, please see memcache's documentation.
-
-    class Memcache < Abstract::ID
-      using ::Rack::RegexpExtensions
-
-      attr_reader :mutex, :pool
-
-      DEFAULT_OPTIONS = Abstract::ID::DEFAULT_OPTIONS.merge \
-        namespace: 'rack:session',
-        memcache_server: 'localhost:11211'
-
-      def initialize(app, options = {})
-        super
-
-        @mutex = Mutex.new
-        mserv = @default_options[:memcache_server]
-        mopts = @default_options.reject{|k, v| !MemCache::DEFAULT_OPTIONS.include? k }
-
-        @pool = options[:cache] || MemCache.new(mserv, mopts)
-        unless @pool.active? and @pool.servers.any?(&:alive?)
-          raise 'No memcache servers'
-        end
-      end
-
-      def generate_sid
-        loop do
-          sid = super
-          break sid unless @pool.get(sid, true)
-        end
-      end
-
-      def get_session(env, sid)
-        with_lock(env) do
-          unless sid and session = @pool.get(sid)
-            sid, session = generate_sid, {}
-            unless /^STORED/.match?(@pool.add(sid, session))
-              raise "Session collision on '#{sid.inspect}'"
-            end
-          end
-          [sid, session]
-        end
-      end
-
-      def set_session(env, session_id, new_session, options)
-        expiry = options[:expire_after]
-        expiry = expiry.nil? ? 0 : expiry + 1
-
-        with_lock(env) do
-          @pool.set session_id, new_session, expiry
-          session_id
-        end
-      end
-
-      def destroy_session(env, session_id, options)
-        with_lock(env) do
-          @pool.delete(session_id)
-          generate_sid unless options[:drop]
-        end
-      end
-
-      def with_lock(env)
-        @mutex.lock if env[RACK_MULTITHREAD]
-        yield
-      rescue MemCache::MemCacheError, Errno::ECONNREFUSED
-        if $VERBOSE
-          warn "#{self} is unable to find memcached server."
-          warn $!.inspect
-        end
-        raise
-      ensure
-        @mutex.unlock if @mutex.locked?
-      end
-
-    end
+    warn "Rack::Session::Memcache is deprecated, please use Rack::Session::Dalli from 'dalli' gem instead."
+    Memcache = Dalli
   end
 end
diff --git a/test/spec_session_memcache.rb b/test/spec_session_memcache.rb
deleted file mode 100644
index a015cee6..00000000
--- a/test/spec_session_memcache.rb
+++ /dev/null
@@ -1,322 +0,0 @@
-# frozen_string_literal: true
-
-require 'minitest/global_expectations/autorun'
-begin
-  require 'rack/session/memcache'
-  require 'rack/lint'
-  require 'rack/mock'
-  require 'thread'
-
-  describe Rack::Session::Memcache do
-    session_key = Rack::Session::Memcache::DEFAULT_OPTIONS[:key]
-    session_match = /#{session_key}=([0-9a-fA-F]+);/
-    incrementor = lambda do |env|
-      env["rack.session"]["counter"] ||= 0
-      env["rack.session"]["counter"] += 1
-      Rack::Response.new(env["rack.session"].inspect).to_a
-    end
-    drop_session = Rack::Lint.new(proc do |env|
-      env['rack.session.options'][:drop] = true
-      incrementor.call(env)
-    end)
-    renew_session = Rack::Lint.new(proc do |env|
-      env['rack.session.options'][:renew] = true
-      incrementor.call(env)
-    end)
-    defer_session = Rack::Lint.new(proc do |env|
-      env['rack.session.options'][:defer] = true
-      incrementor.call(env)
-    end)
-    skip_session = Rack::Lint.new(proc do |env|
-      env['rack.session.options'][:skip] = true
-      incrementor.call(env)
-    end)
-    incrementor = Rack::Lint.new(incrementor)
-
-    # test memcache connection
-    Rack::Session::Memcache.new(incrementor)
-
-    it "faults on no connection" do
-      lambda {
-        Rack::Session::Memcache.new(incrementor, memcache_server: 'nosuchserver')
-      }.must_raise(RuntimeError).message.must_equal 'No memcache servers'
-    end
-
-    it "connects to existing server" do
-      test_pool = MemCache.new(incrementor, namespace: 'test:rack:session')
-      test_pool.namespace.must_equal 'test:rack:session'
-    end
-
-    it "passes options to MemCache" do
-      pool = Rack::Session::Memcache.new(incrementor, namespace: 'test:rack:session')
-      pool.pool.namespace.must_equal 'test:rack:session'
-    end
-
-    it "creates a new cookie" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      res = Rack::MockRequest.new(pool).get("/")
-      res["Set-Cookie"].must_include "#{session_key}="
-      res.body.must_equal '{"counter"=>1}'
-    end
-
-    it "determines session from a cookie" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-      res = req.get("/")
-      cookie = res["Set-Cookie"]
-      req.get("/", "HTTP_COOKIE" => cookie).
-        body.must_equal '{"counter"=>2}'
-      req.get("/", "HTTP_COOKIE" => cookie).
-        body.must_equal '{"counter"=>3}'
-    end
-
-    it "determines session only from a cookie by default" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-      res = req.get("/")
-      sid = res["Set-Cookie"][session_match, 1]
-      req.get("/?rack.session=#{sid}").
-        body.must_equal '{"counter"=>1}'
-      req.get("/?rack.session=#{sid}").
-        body.must_equal '{"counter"=>1}'
-    end
-
-    it "determines session from params" do
-      pool = Rack::Session::Memcache.new(incrementor, cookie_only: false)
-      req = Rack::MockRequest.new(pool)
-      res = req.get("/")
-      sid = res["Set-Cookie"][session_match, 1]
-      req.get("/?rack.session=#{sid}").
-        body.must_equal '{"counter"=>2}'
-      req.get("/?rack.session=#{sid}").
-        body.must_equal '{"counter"=>3}'
-    end
-
-    it "survives nonexistant cookies" do
-      bad_cookie = "rack.session=blarghfasel"
-      pool = Rack::Session::Memcache.new(incrementor)
-      res = Rack::MockRequest.new(pool).
-        get("/", "HTTP_COOKIE" => bad_cookie)
-      res.body.must_equal '{"counter"=>1}'
-      cookie = res["Set-Cookie"][session_match]
-      cookie.wont_match(/#{bad_cookie}/)
-    end
-
-    it "maintains freshness" do
-      pool = Rack::Session::Memcache.new(incrementor, expire_after: 3)
-      res = Rack::MockRequest.new(pool).get('/')
-      res.body.must_include '"counter"=>1'
-      cookie = res["Set-Cookie"]
-      res = Rack::MockRequest.new(pool).get('/', "HTTP_COOKIE" => cookie)
-      res["Set-Cookie"].must_equal cookie
-      res.body.must_include '"counter"=>2'
-      puts 'Sleeping to expire session' if $DEBUG
-      sleep 4
-      res = Rack::MockRequest.new(pool).get('/', "HTTP_COOKIE" => cookie)
-      res["Set-Cookie"].wont_equal cookie
-      res.body.must_include '"counter"=>1'
-    end
-
-    it "does not send the same session id if it did not change" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-
-      res0 = req.get("/")
-      cookie = res0["Set-Cookie"][session_match]
-      res0.body.must_equal '{"counter"=>1}'
-
-      res1 = req.get("/", "HTTP_COOKIE" => cookie)
-      res1["Set-Cookie"].must_be_nil
-      res1.body.must_equal '{"counter"=>2}'
-
-      res2 = req.get("/", "HTTP_COOKIE" => cookie)
-      res2["Set-Cookie"].must_be_nil
-      res2.body.must_equal '{"counter"=>3}'
-    end
-
-    it "deletes cookies with :drop option" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-      drop = Rack::Utils::Context.new(pool, drop_session)
-      dreq = Rack::MockRequest.new(drop)
-
-      res1 = req.get("/")
-      session = (cookie = res1["Set-Cookie"])[session_match]
-      res1.body.must_equal '{"counter"=>1}'
-
-      res2 = dreq.get("/", "HTTP_COOKIE" => cookie)
-      res2["Set-Cookie"].must_be_nil
-      res2.body.must_equal '{"counter"=>2}'
-
-      res3 = req.get("/", "HTTP_COOKIE" => cookie)
-      res3["Set-Cookie"][session_match].wont_equal session
-      res3.body.must_equal '{"counter"=>1}'
-    end
-
-    it "provides new session id with :renew option" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-      renew = Rack::Utils::Context.new(pool, renew_session)
-      rreq = Rack::MockRequest.new(renew)
-
-      res1 = req.get("/")
-      session = (cookie = res1["Set-Cookie"])[session_match]
-      res1.body.must_equal '{"counter"=>1}'
-
-      res2 = rreq.get("/", "HTTP_COOKIE" => cookie)
-      new_cookie = res2["Set-Cookie"]
-      new_session = new_cookie[session_match]
-      new_session.wont_equal session
-      res2.body.must_equal '{"counter"=>2}'
-
-      res3 = req.get("/", "HTTP_COOKIE" => new_cookie)
-      res3.body.must_equal '{"counter"=>3}'
-
-      # Old cookie was deleted
-      res4 = req.get("/", "HTTP_COOKIE" => cookie)
-      res4.body.must_equal '{"counter"=>1}'
-    end
-
-    it "omits cookie with :defer option but still updates the state" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      count = Rack::Utils::Context.new(pool, incrementor)
-      defer = Rack::Utils::Context.new(pool, defer_session)
-      dreq = Rack::MockRequest.new(defer)
-      creq = Rack::MockRequest.new(count)
-
-      res0 = dreq.get("/")
-      res0["Set-Cookie"].must_be_nil
-      res0.body.must_equal '{"counter"=>1}'
-
-      res0 = creq.get("/")
-      res1 = dreq.get("/", "HTTP_COOKIE" => res0["Set-Cookie"])
-      res1.body.must_equal '{"counter"=>2}'
-      res2 = dreq.get("/", "HTTP_COOKIE" => res0["Set-Cookie"])
-      res2.body.must_equal '{"counter"=>3}'
-    end
-
-    it "omits cookie and state update with :skip option" do
-      pool = Rack::Session::Memcache.new(incrementor)
-      count = Rack::Utils::Context.new(pool, incrementor)
-      skip = Rack::Utils::Context.new(pool, skip_session)
-      sreq = Rack::MockRequest.new(skip)
-      creq = Rack::MockRequest.new(count)
-
-      res0 = sreq.get("/")
-      res0["Set-Cookie"].must_be_nil
-      res0.body.must_equal '{"counter"=>1}'
-
-      res0 = creq.get("/")
-      res1 = sreq.get("/", "HTTP_COOKIE" => res0["Set-Cookie"])
-      res1.body.must_equal '{"counter"=>2}'
-      res2 = sreq.get("/", "HTTP_COOKIE" => res0["Set-Cookie"])
-      res2.body.must_equal '{"counter"=>2}'
-    end
-
-    it "updates deep hashes correctly" do
-      hash_check = proc do |env|
-        session = env['rack.session']
-        unless session.include? 'test'
-          session.update :a => :b, :c => { d: :e },
-            :f => { g: { h: :i } }, 'test' => true
-        else
-          session[:f][:g][:h] = :j
-        end
-        [200, {}, [session.inspect]]
-      end
-      pool = Rack::Session::Memcache.new(hash_check)
-      req = Rack::MockRequest.new(pool)
-
-      res0 = req.get("/")
-      session_id = (cookie = res0["Set-Cookie"])[session_match, 1]
-      ses0 = pool.pool.get(session_id, true)
-
-      req.get("/", "HTTP_COOKIE" => cookie)
-      ses1 = pool.pool.get(session_id, true)
-
-      ses1.wont_equal ses0
-    end
-
-    # anyone know how to do this better?
-    it "cleanly merges sessions when multithreaded" do
-      skip unless $DEBUG
-
-      warn 'Running multithread test for Session::Memcache'
-      pool = Rack::Session::Memcache.new(incrementor)
-      req = Rack::MockRequest.new(pool)
-
-      res = req.get('/')
-      res.body.must_equal '{"counter"=>1}'
-      cookie = res["Set-Cookie"]
-      session_id = cookie[session_match, 1]
-
-      delta_incrementor = lambda do |env|
-        # emulate disconjoinment of threading
-        env['rack.session'] = env['rack.session'].dup
-        Thread.stop
-        env['rack.session'][(Time.now.usec * rand).to_i] = true
-        incrementor.call(env)
-      end
-      tses = Rack::Utils::Context.new pool, delta_incrementor
-      treq = Rack::MockRequest.new(tses)
-      tnum = rand(7).to_i + 5
-      r = Array.new(tnum) do
-        Thread.new(treq) do |run|
-          run.get('/', "HTTP_COOKIE" => cookie, 'rack.multithread' => true)
-        end
-      end.reverse.map{|t| t.run.join.value }
-      r.each do |request|
-        request['Set-Cookie'].must_equal cookie
-        request.body.must_include '"counter"=>2'
-      end
-
-      session = pool.pool.get(session_id)
-      session.size.must_equal tnum + 1 # counter
-      session['counter'].must_equal 2 # meeeh
-
-      tnum = rand(7).to_i + 5
-      r = Array.new(tnum) do
-        app = Rack::Utils::Context.new pool, time_delta
-        req = Rack::MockRequest.new app
-        Thread.new(req) do |run|
-          run.get('/', "HTTP_COOKIE" => cookie, 'rack.multithread' => true)
-        end
-      end.reverse.map{|t| t.run.join.value }
-      r.each do |request|
-        request['Set-Cookie'].must_equal cookie
-        request.body.must_include '"counter"=>3'
-      end
-
-      session = pool.pool.get(session_id)
-      session.size.must_equal tnum + 1
-      session['counter'].must_equal 3
-
-      drop_counter = proc do |env|
-        env['rack.session'].delete 'counter'
-        env['rack.session']['foo'] = 'bar'
-        [200, { 'Content-Type' => 'text/plain' }, env['rack.session'].inspect]
-      end
-      tses = Rack::Utils::Context.new pool, drop_counter
-      treq = Rack::MockRequest.new(tses)
-      tnum = rand(7).to_i + 5
-      r = Array.new(tnum) do
-        Thread.new(treq) do |run|
-          run.get('/', "HTTP_COOKIE" => cookie, 'rack.multithread' => true)
-        end
-      end.reverse.map{|t| t.run.join.value }
-      r.each do |request|
-        request['Set-Cookie'].must_equal cookie
-        request.body.must_include '"foo"=>"bar"'
-      end
-
-      session = pool.pool.get(session_id)
-      session.size.must_equal r.size + 1
-      session['counter'].must_be_nil?
-      session['foo'].must_equal 'bar'
-    end
-  end
-rescue RuntimeError
-  $stderr.puts "Skipping Rack::Session::Memcache tests. Start memcached and try again."
-rescue LoadError
-  $stderr.puts "Skipping Rack::Session::Memcache tests (Memcache is required). `gem install memcache-client` and try again."
-end