Clean up redis configuration. Allow using REDIS_URL to set advanced (#2732)

connection options instead of setting REDIS_HOST etc individually

Close #1986

.env.production.sample

@@ -1,7 +1,8 @@
 # Service dependencies
+# You may set REDIS_URL instead for more advanced options
 REDIS_HOST=redis
 REDIS_PORT=6379
-# REDIS_DB=0
+# You may set DB_URL instead for more advanced options
 DB_HOST=db
 DB_USER=postgres
 DB_NAME=postgres

config/cable.yml

@@ -1,10 +0,0 @@
-development:
-  adapter: redis
-  url: redis://localhost:6379/1
-
-test:
-  adapter: async
-
-production:
-  adapter: redis
-  url: redis://<%= ENV['REDIS_PASSWORD'] ? ':' + ENV['REDIS_PASSWORD'] + '@' : '' %><%= ENV['REDIS_HOST'] || 'localhost' %>:<%= ENV['REDIS_PORT'] || 6379 %>/1

config/environments/development.rb

@@ -16,14 +16,6 @@ Rails.application.configure do
   if Rails.root.join('tmp/caching-dev.txt').exist?
     config.action_controller.perform_caching = true
 
-    config.cache_store = :redis_store, {
-      host: ENV['REDIS_HOST'] || 'localhost',
-      port: ENV['REDIS_PORT'] || 6379,
-      db: 0,
-      namespace: 'cache',
-      expires_in: 1.minute,
-    }
-
     config.public_file_server.headers = {
       'Cache-Control' => 'public, max-age=172800',
     }

config/environments/production.rb

@@ -45,27 +45,6 @@ Rails.application.configure do
   # Use a different logger for distributed setups.
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
-  # Parse and split the REDIS_URL if passed (used with hosting platforms such as Heroku).
-  # Set ENV variables because they are used elsewhere.
-  if ENV['REDIS_URL']
-    redis_url = URI.parse(ENV['REDIS_URL'])
-    ENV['REDIS_HOST'] = redis_url.host
-    ENV['REDIS_PORT'] = redis_url.port.to_s
-    ENV['REDIS_PASSWORD'] = redis_url.password
-    db_num = redis_url.path[1..-1]
-    ENV['REDIS_DB'] = db_num if db_num.present?
-  end
-
-  # Use a different cache store in production.
-  config.cache_store = :redis_store, {
-    host: ENV.fetch('REDIS_HOST') { 'localhost' },
-    port: ENV.fetch('REDIS_PORT') { 6379 },
-    password: ENV.fetch('REDIS_PASSWORD') { false },
-    db: ENV.fetch('REDIS_DB') { 0 },
-    namespace: 'cache',
-    expires_in: 10.minutes,
-  }
-
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.action_controller.asset_host = 'http://assets.example.com'
 

config/initializers/ostatus.rb

@@ -15,7 +15,6 @@ Rails.application.configure do
   config.x.streaming_api_base_url          = 'http://localhost:4000'
 
   if Rails.env.production?
-    config.action_cable.allowed_request_origins = ["http#{https ? 's' : ''}://#{web_host}"]
     config.x.streaming_api_base_url = ENV.fetch('STREAMING_API_BASE_URL') { "http#{https ? 's' : ''}://#{web_host}" }
   end
 end

config/initializers/redis.rb

@@ -1,8 +1,22 @@
 # frozen_string_literal: true
 
+if ENV['REDIS_URL'].blank?
+  password = ENV.fetch('REDIS_PASSWORD') { '' }
+  host     = ENV.fetch('REDIS_HOST') { 'localhost' }
+  port     = ENV.fetch('REDIS_PORT') { 6379 }
+  db       = ENV.fetch('REDIS_DB') { 0 }
+
+  ENV['REDIS_URL'] = "redis://#{password.blank? ? '' : ":#{password}@"}#{host}:#{port}/#{db}"
+end
+
 Redis.current = Redis.new(
-  host: ENV.fetch('REDIS_HOST') { 'localhost' },
+  url: ENV['REDIS_URL'],
-  port: ENV.fetch('REDIS_PORT') { 6379 },
-  password: ENV.fetch('REDIS_PASSWORD') { false },
   driver: :hiredis
 )
+
+Rails.application.configure do
+  config.cache_store = :redis_store, ENV['REDIS_URL'], {
+    namespace: 'cache',
+    expires_in: 10.minutes,
+  }
+end

config/initializers/sidekiq.rb

@@ -1,12 +1,9 @@
-host = ENV.fetch('REDIS_HOST') { 'localhost' }
+# frozen_string_literal: true
-port = ENV.fetch('REDIS_PORT') { 6379 }
-password = ENV.fetch('REDIS_PASSWORD') { false }
-db = ENV.fetch('REDIS_DB') { 0 }
 
 Sidekiq.configure_server do |config|
-  config.redis = { host: host, port: port, db: db, password: password }
+  config.redis = { url: ENV['REDIS_URL'] }
 end
 
 Sidekiq.configure_client do |config|
-  config.redis = { host: host, port: port, db: db, password: password }
+  config.redis = { url: ENV['REDIS_URL'] }
 end

streaming/index.js

@@ -16,23 +16,42 @@ dotenv.config({
   path: env === 'production' ? '.env.production' : '.env'
 })
 
-if (cluster.isMaster) {
+const dbUrlToConfig = (dbUrl) => {
-  // cluster master
+  if (!dbUrl) {
+    return {}
+  }
 
+  const params = url.parse(dbUrl)
+  const auth   = params.auth ? params.auth.split(':') : []
+
+  return {
+    user: auth[0],
+    password: auth[1],
+    host: params.hostname,
+    port: params.port,
+    database: params.pathname ? params.pathname.split('/')[1] : null,
+    ssl: true
+  }
+}
+
+if (cluster.isMaster) {
+  // Cluster master
   const core = +process.env.STREAMING_CLUSTER_NUM || (env === 'development' ? 1 : Math.max(os.cpus().length - 1, 1))
+
   const fork = () => {
     const worker = cluster.fork();
+
     worker.on('exit', (code, signal) => {
       log.error(`Worker died with exit code ${code}, signal ${signal} received.`);
       setTimeout(() => fork(), 0);
     });
   };
+
   for (let i = 0; i < core; i++) fork();
+
   log.info(`Starting streaming API server master with ${core} workers`)
-
 } else {
-  // cluster worker
+  // Cluster worker
-
   const pgConfigs = {
     development: {
       database: 'mastodon_development',
@@ -51,14 +70,15 @@ if (cluster.isMaster) {
   }
 
   const app    = express()
-  const pgPool = new pg.Pool(pgConfigs[env])
+  const pgPool = new pg.Pool(Object.assign(dbUrlToConfig(process.env.DB_URL), pgConfigs[env]))
   const server = http.createServer(app)
   const wss    = new WebSocket.Server({ server })
 
   const redisClient = redis.createClient({
     host:     process.env.REDIS_HOST     || '127.0.0.1',
     port:     process.env.REDIS_PORT     || 6379,
-    password: process.env.REDIS_PASSWORD
+    password: process.env.REDIS_PASSWORD,
+    url:      process.env.REDIS_URL      || null
   })
 
   const subs = {}