EXPERIMENTAL: Allow app to Logstash directly.

Gemfile

@@ -172,7 +172,8 @@ gem 'memory_profiler', require: false, platform: :mri
 
 gem 'cppjieba_rb', require: false
 
-gem 'lograge'
+gem 'lograge', require: false
+gem 'logstash-logger', require: false
 gem 'logster'
 
 gem 'sassc', require: false

Gemfile.lock

@@ -155,6 +155,9 @@ GEM
       activesupport (>= 4, < 5.2)
       railties (>= 4, < 5.2)
       request_store (~> 1.0)
+    logstash-event (1.2.02)
+    logstash-logger (0.25.1)
+      logstash-event (~> 1.2)
     logster (1.2.8)
     loofah (2.1.1)
       crass (~> 1.0.2)
@@ -438,6 +441,7 @@ DEPENDENCIES
   http_accept_language (~> 2.0.5)
   listen
   lograge
+  logstash-logger
   logster
   lru_redux
   mail

config/initializers/100-lograge.rb

@@ -1,10 +1,27 @@
 if (Rails.env.production? && SiteSetting.logging_provider == 'lograge') || ENV["ENABLE_LOGRAGE"]
+  require 'lograge'
+
   Rails.application.configure do
     config.lograge.enabled = true
 
     config.lograge.custom_options = lambda do |event|
       exceptions = %w(controller action format id)
-      { params: event.payload[:params].except(*exceptions) }
+
+      {
+        params: event.payload[:params].except(*exceptions),
+        type: :rails
+      }
+    end
+
+    if (logstash_uri = ENV["LOGSTASH_URI"].present?)
+      require 'logstash-logger'
+
+      config.lograge.formatter = Lograge::Formatters::Logstash.new
+
+      config.lograge.logger = LogStashLogger.new(
+        type: :tcp,
+        uri: logstash_uri
+      )
     end
   end
 end