namespace redis usage (#2869)

* add redis-namespace gem

* namespace redis usage

* refactor redis namespace code to be less intrusive

previously : would be prepended to keys when the
REDIS_NAMESPACE env var was not set

now if it is not set the namespacing functions are
not used at all, which should prevent disruptions
when instances update.

* fix redis namespace variable style in streaming js

* remove trailing space

* final redis namespace style fix

1 files changed, 9 insertions, 2 deletions

diff --git a/config/initializers/sidekiq.rb b/config/initializers/sidekiq.rb
index 3d2e4741d..b70784d79 100644
--- a/config/initializers/sidekiq.rb
+++ b/config/initializers/sidekiq.rb
@@ -1,9 +1,16 @@
 # frozen_string_literal: true
 
+namespace = ENV.fetch('REDIS_NAMESPACE') { nil }
+redis_params = { url: ENV['REDIS_URL'] }
+
+if namespace
+  redis_params [:namespace] = namespace
+end
+
 Sidekiq.configure_server do |config|
-  config.redis = { url: ENV['REDIS_URL'] }
+  config.redis = redis_params
 end
 
 Sidekiq.configure_client do |config|
-  config.redis = { url: ENV['REDIS_URL'] }
+  config.redis = redis_params
 end