FIX: silence and quiet logger not thread safe

This caused info/warning to be consistently missing
in dev mode when using puma

Gemfile.lock

@@ -140,7 +140,7 @@ GEM
     kgio (2.10.0)
     libv8 (5.3.332.38.3)
     listen (0.7.3)
-    logster (1.2.5)
+    logster (1.2.7)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     lru_redux (1.1.0)
@@ -476,4 +476,4 @@ DEPENDENCIES
   unicorn
 
 BUNDLED WITH
-   1.13.7
+   1.14.2

config/initializers/100-quiet_logger.rb

@@ -4,14 +4,20 @@ end
 
 Rails::Rack::Logger.class_eval do
   def call_with_quiet_assets(env)
-    previous_level = Rails.logger.level
+
+    override = false
     if (env['PATH_INFO'].index("/assets/") == 0) or
        (env['PATH_INFO'].index("mini-profiler-resources") == 0)
-      Rails.logger.level = Logger::ERROR
+      if ::Logster::Logger === Rails.logger
+        override = true
+        Rails.logger.override_level = Logger::ERROR
+      end
     end
 
     call_without_quiet_assets(env).tap do
-      Rails.logger.level = previous_level
+      if override
+        Rails.logger.override_level = nil
+      end
     end
   end
   alias_method_chain :call, :quiet_assets

config/initializers/100-silence_logger.rb

@@ -12,21 +12,24 @@ class SilenceLogger < Rails::Rack::Logger
   end
 
   def call(env)
-    prev_level = Rails.logger.level
     path_info = env[PATH_INFO]
+    override = false
 
     if    env[HTTP_X_SILENCE_LOGGER] ||
           @opts[:silenced].include?(path_info) ||
           path_info.start_with?('/logs') ||
           path_info.start_with?('/user_avatar') ||
           path_info.start_with?('/letter_avatar')
-      Rails.logger.level = Logger::WARN
+      if ::Logster::Logger === Rails.logger
+        override = true
+        Rails.logger.override_level = Logger::WARN
+      end
       @app.call(env)
     else
       super(env)
     end
   ensure
-    Rails.logger.level = prev_level
+    Rails.logger.override_level = nil if override
   end
 end