1 files changed, 19 insertions, 0 deletions
diff --git a/app/models/concerns/lockable.rb b/app/models/concerns/lockable.rb
new file mode 100644
index 000000000..55a9714ca
--- /dev/null
+++ b/app/models/concerns/lockable.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Lockable
+  # @param [String] lock_name
+  # @param [ActiveSupport::Duration] autorelease Automatically release the lock after this time
+  # @param [Boolean] raise_on_failure Raise an error if a lock cannot be acquired, or fail silently
+  # @raise [Mastodon::RaceConditionError]
+  def with_lock(lock_name, autorelease: 15.minutes, raise_on_failure: true)
+    with_redis do |redis|
+      RedisLock.acquire(redis: redis, key: "lock:#{lock_name}", autorelease: autorelease.seconds) do |lock|
+        if lock.acquired?
+          yield
+        elsif raise_on_failure
+          raise Mastodon::RaceConditionError, "Could not acquire lock for #{lock_name}, try again later"
+        end
+      end
+    end
+  end
+end