From afde6fdd5ef3e6b0693a7e330777e85ef4cffddb Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 19 Oct 2011 12:59:33 -0500
Subject: Added X-Request-Id tracking and TaggedLogging to easily log that and
 other production concerns

---
 activesupport/lib/active_support.rb                |  1 +
 activesupport/lib/active_support/tagged_logging.rb | 68 ++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 activesupport/lib/active_support/tagged_logging.rb

(limited to 'activesupport/lib')

diff --git a/activesupport/lib/active_support.rb b/activesupport/lib/active_support.rb
index cc9ea5cffa..ff78e718f2 100644
--- a/activesupport/lib/active_support.rb
+++ b/activesupport/lib/active_support.rb
@@ -71,6 +71,7 @@ module ActiveSupport
     autoload :OrderedOptions
     autoload :Rescuable
     autoload :StringInquirer
+    autoload :TaggedLogging
     autoload :XmlMini
   end
 
diff --git a/activesupport/lib/active_support/tagged_logging.rb b/activesupport/lib/active_support/tagged_logging.rb
new file mode 100644
index 0000000000..0d8504bc1f
--- /dev/null
+++ b/activesupport/lib/active_support/tagged_logging.rb
@@ -0,0 +1,68 @@
+module ActiveSupport
+  # Wraps any standard Logger class to provide tagging capabilities. Examples:
+  #
+  #   Logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))
+  #   Logger.tagged("BCX") { Logger.info "Stuff" }                            # Logs "[BCX] Stuff"
+  #   Logger.tagged("BCX", "Jason") { Logger.info "Stuff" }                   # Logs "[BCX] [Jason] Stuff"
+  #   Logger.tagged("BCX") { Logger.tagged("Jason") { Logger.info "Stuff" } } # Logs "[BCX] [Jason] Stuff"
+  #
+  # This is used by the default Rails.logger as configured by Railties to make it easy to stamp log lines
+  # with subdomains, request ids, and anything else to aid debugging of multi-user production applications.
+  class TaggedLogging
+    def initialize(logger)
+      @logger = logger
+      @tags   = []
+    end
+
+    def tagged(*tags)
+      new_tags = Array.wrap(tags).flatten
+      @tags += new_tags
+      yield
+    ensure
+      new_tags.size.times { @tags.pop }
+    end
+
+
+    def add(severity, message = nil, progname = nil, &block)
+      @logger.add(severity, "#{tags}#{message}", progname, &block)
+    end
+
+
+    def fatal(progname = nil, &block)
+      add(@logger.class::FATAL, progname, &block)
+    end
+
+    def error(progname = nil, &block)
+      add(@logger.class::ERROR, progname, &block)
+    end
+
+    def warn(progname = nil, &block)
+      add(@logger.class::WARN, progname, &block)
+    end
+
+    def info(progname = nil, &block)
+      add(@logger.class::INFO, progname, &block)
+    end
+
+    def debug(progname = nil, &block)
+      add(@logger.class::DEBUG, progname, &block)
+    end
+
+    def unknown(progname = nil, &block)
+      add(@logger.class::UNKNOWN, progname, &block)
+    end
+
+
+    def method_missing(method, *args)
+      @logger.send(method, *args)
+    end
+    
+
+    private
+      def tags
+        if @tags.any?
+          @tags.collect { |tag| "[#{tag}]" }.join(" ") + " "
+        end
+      end
+  end
+end
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