Custom formatter

lib/custom_log_formatter.rb

@@ -0,0 +1,18 @@
+class CustomLogFormatter < ActiveSupport::Logger::SimpleFormatter
+  SEVERITY_TO_COLOR_MAP = {'DEBUG'=>'0;37', 'INFO'=>'32', 'WARN'=>'33', 'ERROR'=>'31', 'FATAL'=>'31', 'UNKNOWN'=>'37'}
+
+  IPRegexp = /\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b/
+  FilteredString = '**FILTERED**'
+
+  def call(severity, time, progname, msg)
+    formatted_severity = sprintf("%-5s","#{severity}")
+    formatted_time = time.strftime("%Y-%m-%d %H:%M:%S.") << time.usec.to_s[0..2].rjust(3)
+    color = SEVERITY_TO_COLOR_MAP[severity]
+
+    "\033[0;37m#{formatted_time}\033[0m [\033[#{color}m#{formatted_severity}\033[0m] #{filter_ip(msg.strip)} (pid:#{$$})\n"
+  end
+
+  def filter_ip(msg)
+    msg.gsub(IPRegexp, FilteredString)
+  end
+end