Bump version and update changelog.

Add support for pooled memcached clients by using #with

.rubocop.yml

@@ -74,7 +74,7 @@ Style/SpaceInsideBrackets:
 Style/AndOr:
   Enabled: false
 
-Style/TrailingComma:
+Style/TrailingCommaInLiteral:
   Enabled: true
 
 Style/SpaceBeforeComma:
@@ -98,7 +98,7 @@ Style/SpaceAfterColon:
 Style/SpaceAfterComma:
   Enabled: true
 
-Style/SpaceAfterControlKeyword:
+Style/SpaceAroundKeyword:
   Enabled: true
 
 Style/SpaceAfterNot:
@@ -163,7 +163,7 @@ Style/StringLiterals:
   EnforcedStyle: double_quotes
 
 Metrics/CyclomaticComplexity:
-  Max: 8
+  Max: 10
 
 Metrics/LineLength:
   Max: 128
@@ -214,3 +214,6 @@ Metrics/ParameterLists:
 
 Metrics/PerceivedComplexity:
   Enabled: false
+
+Style/Documentation:
+  Enabled: false

.travis.yml

@@ -1,6 +1,9 @@
 language: ruby
 rvm:
-  - 2.2.0
+  - 2.2.6
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1
 services:
   - memcached
   - redis-server

CHANGELOG.md

@@ -1,3 +1,16 @@
+## 0.3.4
+
+- Support for connection pooling when using memcached locks, via `with` blocks using Dalli (thanks to Lev).
+
+## 0.3.3
+
+- Default TTL for keys to allow for short-lived locking keys (thanks to Ian Remillard) without leaking memory.
+- Vastly improve initial lock acquisition, especially on Redis (thanks to Jeremy Wadscak).
+
+## 0.3.2
+
+- Custom lock tokens (thanks to avokhmin).
+
 ## 0.3.1
 
 - Slight memory leak fix.

README.md

@@ -72,6 +72,15 @@ suo.lock do |token|
 end
 ```
 
+### Time To Live
+
+```ruby
+Suo::Client::Redis.new("bar_resource", ttl: 60) #ttl in seconds
+```
+
+A key representing a set of lockable resources is removed once the last resource lock is released and the `ttl` time runs out. When another lock is acquired and the key has been removed the key has to be recreated.
+
+
 ## TODO
  - more race condition tests
 

lib/suo/client/base.rb

@@ -5,7 +5,8 @@ module Suo
         acquisition_timeout: 0.1,
         acquisition_delay: 0.01,
         stale_lock_expiration: 3600,
-        resources: 1
+        resources: 1,
+        ttl: 60,
       }.freeze
 
       BLANK_STR = "".freeze
@@ -26,8 +27,8 @@ module Suo
         super() # initialize Monitor mixin for thread safety
       end
 
-      def lock
+      def lock(custom_token = nil)
-        token = acquire_lock
+        token = acquire_lock(custom_token)
 
         if block_given? && token
           begin
@@ -55,16 +56,13 @@ module Suo
         retry_with_timeout do
           val, cas = get
 
-          if val.nil?
+          cas = initial_set if val.nil?
-            initial_set
-            next
-          end
 
           cleared_locks = deserialize_and_clear_locks(val)
 
           refresh_lock(cleared_locks, token)
 
-          break if set(serialize_locks(cleared_locks), cas)
+          break if set(serialize_locks(cleared_locks), cas, expire: cleared_locks.empty?)
         end
       end
 
@@ -81,7 +79,7 @@ module Suo
           acquisition_lock = remove_lock(cleared_locks, token)
 
           break unless acquisition_lock
-          break if set(serialize_locks(cleared_locks), cas)
+          break if set(serialize_locks(cleared_locks), cas, expire: cleared_locks.empty?)
         end
       rescue LockClientError => _ # rubocop:disable Lint/HandleExceptions
         # ignore - assume success due to optimistic locking
@@ -95,16 +93,13 @@ module Suo
 
       attr_accessor :retry_count
 
-      def acquire_lock
+      def acquire_lock(token = nil)
-        token = SecureRandom.base64(16)
+        token ||= SecureRandom.base64(16)
 
         retry_with_timeout do
           val, cas = get
 
-          if val.nil?
+          cas = initial_set if val.nil?
-            initial_set
-            next
-          end
 
           cleared_locks = deserialize_and_clear_locks(val)
 

lib/suo/client/memcached.rb

@@ -7,21 +7,29 @@ module Suo
       end
 
       def clear
-        @client.delete(@key)
+        @client.with { |client| client.delete(@key) }
       end
 
       private
 
       def get
-        @client.get_cas(@key)
+        @client.with { |client| client.get_cas(@key) }
       end
 
-      def set(newval, cas)
+      def set(newval, cas, expire: false)
-        @client.set_cas(@key, newval, cas)
+        if expire
+          @client.with { |client| client.set_cas(@key, newval, cas, @options[:ttl]) }
+        else
+          @client.with { |client| client.set_cas(@key, newval, cas) }
+        end
       end
 
       def initial_set(val = BLANK_STR)
-        @client.set(@key, val)
+        @client.with do |client|
+          client.set(@key, val)
+          _val, cas = client.get_cas(@key)
+          cas
+        end
       end
     end
   end

lib/suo/client/redis.rb

@@ -18,9 +18,13 @@ module Suo
         [@client.get(@key), nil]
       end
 
-      def set(newval, _)
+      def set(newval, _, expire: false)
         ret = @client.multi do |multi|
-          multi.set(@key, newval)
+          if expire
+            multi.setex(@key, @options[:ttl], newval)
+          else
+            multi.set(@key, newval)
+          end
         end
 
         ret && ret[0] == OK_STR
@@ -35,7 +39,8 @@ module Suo
       end
 
       def initial_set(val = BLANK_STR)
-        @client.set(@key, val)
+        set(val, nil)
+        nil
       end
     end
   end

lib/suo/version.rb

@@ -1,3 +1,3 @@
 module Suo
-  VERSION = "0.3.1"
+  VERSION = "0.3.4".freeze
 end

suo.gemspec

@@ -16,7 +16,6 @@ Gem::Specification.new do |spec|
 
   spec.files         = `git ls-files -z`.split("\x0")
   spec.bindir        = "bin"
-  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
@@ -26,9 +25,9 @@ Gem::Specification.new do |spec|
   spec.add_dependency "redis"
   spec.add_dependency "msgpack"
 
-  spec.add_development_dependency "bundler", "~> 1.5"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rubocop", "~> 0.30.0"
+  spec.add_development_dependency "rubocop", "~> 0.49.0"
   spec.add_development_dependency "minitest", "~> 5.5.0"
   spec.add_development_dependency "codeclimate-test-reporter", "~> 0.4.7"
 end

test/client_test.rb

@@ -31,6 +31,12 @@ module ClientTests
     assert_equal false, locked
   end
 
+  def test_lock_with_custom_token
+    token = 'foo-bar'
+    lock  = @client.lock token
+    assert_equal lock, token
+  end
+
   def test_empty_lock_on_invalid_data
     @client.send(:initial_set, "bad value")
     assert_equal false, @client.locked?