1 files changed, 52 insertions, 0 deletions
diff --git a/lib/gitlab_reference_counter.rb b/lib/gitlab_reference_counter.rb
new file mode 100644
index 0000000..dc08f42
--- /dev/null
+++ b/lib/gitlab_reference_counter.rb
@@ -0,0 +1,52 @@
+require_relative 'gitlab_init'
+require_relative 'gitlab_net'
+
+class GitlabReferenceCounter
+  REFERENCE_EXPIRE_TIME = 600
+
+  attr_reader :path, :key
+
+  def initialize(path)
+    @path = path
+    @key = "git-receive-pack-reference-counter:#{path}"
+  end
+
+  def value
+    (redis_client.get(key) || 0).to_i
+  end
+
+  def increase
+    redis_cmd do
+      redis_client.incr(key)
+      redis_client.expire(key, REFERENCE_EXPIRE_TIME)
+    end
+  end
+
+  def decrease
+    redis_cmd do
+      current_value = redis_client.decr(key)
+      if current_value < 0
+        $logger.warn "Reference counter for #{path} decreased when its value was less than 1. Reseting the counter."
+        redis_client.del(key)
+      end
+    end
+  end
+
+  private
+
+  def redis_client
+    @redis_client ||= GitlabNet.new.redis_client
+  end
+
+  def redis_cmd
+    begin
+      yield
+      true
+    rescue => e
+      message = "GitLab: An unexpected error occurred in writing to Redis: #{e}"
+      $stderr.puts message
+      $logger.error message
+      false
+    end
+  end
+end