feat: add Redis integration for sitemap refresh

- Include Redis gem in the Gemfile and update Gemfile.lock
- Implement locking mechanism in the RefreshSitemapWorker to prevent concurrent executions
- Use Redis to manage distributed locks for the sitemap generation process

This change introduces Redis for managing access controls in the sitemap
refresh workflow. It prevents multiple simultaneous jobs from running,
improving stability and performance when generating sitemaps.

Gemfile

@@ -65,6 +65,8 @@ gem "image_processing", "~> 1.13"
 # gem "ruby-vips", "~> 2.2"
 gem "mini_magick", "~> 4.13.2"
 
+gem "redis", "~> 5.3"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"

Gemfile.lock

@@ -365,6 +365,8 @@ GEM
       i18n
     rdoc (6.11.0)
       psych (>= 4.0.0)
+    redis (5.3.0)
+      redis-client (>= 0.22.0)
     redis-client (0.23.2)
       connection_pool
     regexp_parser (2.10.0)
@@ -541,6 +543,7 @@ DEPENDENCIES
   puma (>= 5.0)
   rack-mini-profiler (~> 3.3)
   rails (~> 8.0.1)
+  redis (~> 5.3)
   rubocop-rails-omakase
   ruby-openai (~> 7.3)
   selenium-webdriver

app/workers/refresh_sitemap_worker.rb

@@ -1,7 +1,27 @@
 class RefreshSitemapWorker
   include Sidekiq::Worker
+  require "redis"
 
   def perform
+    lock_key = "refresh_sitemap_lock"
+    lock_ttl = 60 # 锁的生存时间，单位为秒
+
+    redis = Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/1"))
+
+    if redis.set(lock_key, Time.current.to_s, nx: true, ex: lock_ttl)
+      begin
+        generate_sitemap
+      ensure
+        redis.del(lock_key)
+      end
+    else
+      Rails.logger.info "Sitemap refresh is already in progress"
+    end
+  end
+
+  private
+
+  def generate_sitemap
     host = Rails.env.production? ? "https://todayaiweather.com" : "http://127.0.0.1:3000"
     Rails.application.routes.default_url_options[:host] = host
     SitemapGenerator::Sitemap.default_host = ENV.fetch("RAILS_SITEMAP_DEFAULT_HOST", host)