Start passing more context to Discourse.handle_exception

app/controllers/topics_controller.rb

@@ -385,7 +385,7 @@ class TopicsController < ApplicationController
     user_id = (current_user.id if current_user)
     track_visit = should_track_visit_to_topic?
 
-    Scheduler::Defer.later do
+    Scheduler::Defer.later "Track Visit" do
       View.create_for_parent(Topic, topic_id, ip, user_id)
       if track_visit
         TopicUser.track_visit! topic_id, user_id

app/jobs/base.rb

@@ -55,6 +55,23 @@ module Jobs
       true
     end
 
+    # Construct an error context object for Discourse.handle_exception
+    # Subclasses are encouraged to use this!
+    #
+    # `opts` is the arguments passed to execute().
+    # `code_desc` is a short string describing what the code was doing (optional).
+    # `extra` is for any other context you logged.
+    # Note that, when building your `extra`, that :opts, :job, and :code are used by this method,
+    # and :current_db and :current_hostname are used by handle_exception.
+    def error_context(opts, code_desc = nil, extra = {})
+      ctx = {}
+      ctx[:opts] = opts
+      ctx[:job] = self.class
+      ctx[:code] = code_desc if code_desc
+      ctx.merge!(extra) if extra != nil
+      ctx
+    end
+
     def self.delayed_perform(opts={})
       self.new.perform(opts)
     end
@@ -75,6 +92,7 @@ module Jobs
     end
 
     def perform(*args)
+      total_db_time = 0
       ensure_db_instrumented
       opts = args.extract_options!.with_indifferent_access
 
@@ -88,7 +106,12 @@ module Jobs
         if opts.has_key?(:current_site_id) && opts[:current_site_id] != RailsMultisite::ConnectionManagement.current_db
           raise ArgumentError.new("You can't connect to another database when executing a job synchronously.")
         else
-          return execute(opts)
+          begin
+            retval = execute(opts)
+          rescue => exc
+            Discourse.handle_exception(exc, error_context(opts))
+          end
+          return retval
         end
       end
 
@@ -100,11 +123,10 @@ module Jobs
           RailsMultisite::ConnectionManagement.all_dbs
         end
 
-      total_db_time = 0
       exceptions = []
       dbs.each do |db|
         begin
-          thread_exception = nil
+          thread_exception = {}
           # NOTE: This looks odd, in fact it looks crazy but there is a reason
           #  A bug in therubyracer means that under certain conditions running in a fiber
           #  can cause the whole v8 context to corrupt so much that it will hang sidekiq
@@ -128,9 +150,15 @@ module Jobs
             begin
               RailsMultisite::ConnectionManagement.establish_connection(db: db)
               I18n.locale = SiteSetting.default_locale
+              begin
                 execute(opts)
               rescue => e
-              thread_exception = e
+                thread_exception[:ex] = e
+              end
+            rescue => e
+              thread_exception[:ex] = e
+              thread_exception[:code] = "establishing database connection to #{db}"
+              thread_exception[:other] = { problem_db: db }
             ensure
               ActiveRecord::Base.connection_handler.clear_active_connections!
               total_db_time += Instrumenter.stats.duration_ms
@@ -138,17 +166,19 @@ module Jobs
           end
           t.join
 
-          exceptions << thread_exception if thread_exception
+          exceptions << thread_exception unless thread_exception.empty?
         end
       end
 
       if exceptions.length > 0
-        exceptions[1..-1].each do |exception|
-          Discourse.handle_exception(exception, opts)
+        exceptions.each do |exception_hash|
+          Discourse.handle_exception(exception_hash[:ex],
+                error_context(opts, exception_hash[:code], exception_hash[:other]))
         end
-        raise exceptions[0]
+        raise HandledExceptionWrapper.new exceptions[0][:ex]
       end
 
+      nil
     ensure
       ActiveRecord::Base.connection_handler.clear_active_connections!
       @db_duration = total_db_time
@@ -156,6 +186,14 @@ module Jobs
 
   end
 
+  class HandledExceptionWrapper < Exception
+    attr_accessor :wrapped
+    def initialize(ex)
+      super("Wrapped #{ex.class}: #{ex.message}")
+      @wrapped = ex
+    end
+  end
+
   class Scheduled < Base
     extend Scheduler::Schedule
   end

app/jobs/scheduled/periodical_updates.rb

@@ -29,7 +29,10 @@ module Jobs
 
       # Forces rebake of old posts where needed, as long as no system avatars need updating
       unless UserAvatar.where("last_gravatar_download_attempt IS NULL").limit(1).first
-        Post.rebake_old(250)
+        problems = Post.rebake_old(250)
+        problems.each do |hash|
+          Discourse.handle_exception(hash[:ex], error_context(args, "Rebaking post id #{hash[:post].id}", post_id: hash[:post].id))
+        end
       end
 
     end

app/jobs/scheduled/poll_mailbox.rb

@@ -13,6 +13,7 @@ module Jobs
     include Email::BuildEmailHelper
 
     def execute(args)
+      @args = args
       if SiteSetting.pop3s_polling_enabled?
         poll_pop3s
       end
@@ -47,7 +48,7 @@ module Jobs
           client_message = RejectionMailer.send_rejection(message.from, message.body, message.to, message_template)
           Email::Sender.new(client_message, message_template).send
         else
-          Discourse.handle_exception(e, { code: "unknown error for incoming email", mail: mail_string} )
+          Discourse.handle_exception(e, error_context(@args, "unknown error when processing incoming email", mail: mail_string))
         end
       ensure
         mail.delete
@@ -70,7 +71,7 @@ module Jobs
         pop.finish
       end
     rescue Net::POPAuthenticationError => e
-      Discourse.handle_exception(e, { code: "signing in for incoming email" } )
+      Discourse.handle_exception(e, error_context(@args, "Signing in to poll incoming email"))
     end
 
   end

app/models/post.rb

@@ -319,14 +319,16 @@ class Post < ActiveRecord::Base
   end
 
   def self.rebake_old(limit)
+    problems = []
     Post.where('baked_version IS NULL OR baked_version < ?', BAKED_VERSION)
         .limit(limit).each do |p|
       begin
         p.rebake!
       rescue => e
-        Discourse.handle_exception(e)
+        problems << {post: p, ex: e}
       end
     end
+    problems
   end
 
   def rebake!(opts={})

config/initializers/sidekiq.rb

@@ -33,7 +33,7 @@ if Sidekiq.server?
           manager.tick
         rescue => e
           # the show must go on
-          Discourse.handle_exception(e)
+          Discourse.handle_exception(e, {code: "Ticking scheduling manager"})
         end
         sleep 1
       end
@@ -43,7 +43,7 @@ end
 
 Sidekiq.logger.level = Logger::WARN
 
-class SidekiqLogsterReporter
+class SidekiqLogsterReporter < Sidekiq::ExceptionHandler::Logger
   def call(ex, context = {})
     # Pass context to Logster
     fake_env = {}
@@ -65,6 +65,7 @@ class SidekiqLogsterReporter
   end
 end
 
+Sidekiq.error_handlers.clear
 Sidekiq.error_handlers << SidekiqLogsterReporter.new
 
 

lib/auth/default_current_user_provider.rb

@@ -34,7 +34,7 @@ class Auth::DefaultCurrentUserProvider
 
     if current_user && should_update_last_seen?
       u = current_user
-      Scheduler::Defer.later do
+      Scheduler::Defer.later "Updating Last Seen" do
         u.update_last_seen!
         u.update_ip_address!(request.ip)
       end

lib/discourse.rb

@@ -9,8 +9,11 @@ module Discourse
     extend Sidekiq::ExceptionHandler
   end
 
-  # Responsible for exceptions in Sidekiq jobs - not requests!
-  def self.handle_exception(ex, context = nil, parent_logger = nil)
+  # Log an exception.
+  #
+  # If your code is in a scheduled job, it is recommended to use the error_context() function to pass the context.
+  # See app/jobs/base.rb for the error_context function.
+  def self.handle_exception(ex, context = {}, parent_logger = nil)
     context ||= {}
     parent_logger ||= SidekiqExceptionHandler
 

lib/scheduler/defer.rb

@@ -14,10 +14,10 @@ module Scheduler
       @async = val
     end
 
-    def later(&blk)
+    def later(desc = nil, &blk)
       if @async
         start_thread unless @thread.alive?
-        @queue << [RailsMultisite::ConnectionManagement.current_db, blk]
+        @queue << [RailsMultisite::ConnectionManagement.current_db, blk, desc]
       else
         blk.call
       end
@@ -46,11 +46,15 @@ module Scheduler
     end
 
     def do_work
-      db, job = @queue.deq
+      db, job, desc = @queue.deq
+      begin
         RailsMultisite::ConnectionManagement.establish_connection(db: db)
         job.call
       rescue => ex
-      Discourse.handle_exception(ex)
+        Discourse.handle_exception(ex, {code: "Running deferred code '#{desc}'"})
+      end
+    rescue => ex
+      Discourse.handle_exception(ex, {code: "Processing deferred code queue"})
     ensure
       ActiveRecord::Base.connection_handler.clear_active_connections!
     end

lib/scheduler/manager.rb

@@ -42,13 +42,13 @@ module Scheduler
       def keep_alive
         @manager.keep_alive
       rescue => ex
-        Discourse.handle_exception(ex)
+        Discourse.handle_exception(ex, {code: "Scheduling manager keep-alive"})
       end
 
       def reschedule_orphans
         @manager.reschedule_orphans!
       rescue => ex
-        Discourse.handle_exception(ex)
+        Discourse.handle_exception(ex, {code: "Scheduling manager orphan rescheduler"})
       end
 
       def process_queue
@@ -62,8 +62,11 @@ module Scheduler
           info.prev_result = "RUNNING"
           @mutex.synchronize { info.write! }
           klass.new.perform
+        rescue Jobs::HandledExceptionWrapper
+          # Discourse.handle_exception was already called
+          failed = true
         rescue => e
-          Discourse.handle_exception(e)
+          Discourse.handle_exception(e, {code: "Running a scheduled job", job: klass})
           failed = true
         end
         duration = ((Time.now.to_f - start) * 1000).to_i
@@ -74,7 +77,7 @@ module Scheduler
           @mutex.synchronize { info.write! }
         end
       rescue => ex
-        Discourse.handle_exception(ex)
+        Discourse.handle_exception(ex, {code: "Processing scheduled job queue"})
       ensure
         @running = false
       end

spec/components/discourse_spec.rb

@@ -117,22 +117,37 @@ describe Discourse do
   end
 
   context "#handle_exception" do
-    class TempLogger
+
+    class TempSidekiqLogger < Sidekiq::ExceptionHandler::Logger
       attr_accessor :exception, :context
-      def handle_exception(exception, context)
-        self.exception = exception
-        self.context = context
+      def call(ex, ctx)
+        self.exception = ex
+        self.context = ctx
       end
     end
 
+    let!(:logger) { TempSidekiqLogger.new }
+
+    before do
+      Sidekiq.error_handlers.clear
+      Sidekiq.error_handlers << logger
+    end
+    
     it "should not fail when called" do
-      logger = TempLogger.new
       exception = StandardError.new
 
-      Discourse.handle_exception(exception, nil, logger)
+      Discourse.handle_exception(exception, nil, nil)
       logger.exception.should == exception
       logger.context.keys.should == [:current_db, :current_hostname]
     end
+
+    it "correctly passes extra context" do
+      exception = StandardError.new
+
+      Discourse.handle_exception(exception, {code: "Doing a test", post_id: 31}, nil)
+      logger.exception.should == exception
+      logger.context.keys.sort.should == [:current_db, :current_hostname, :code, :post_id].sort
+    end
   end
 
 end

spec/jobs/jobs_base_spec.rb

@@ -27,13 +27,13 @@ describe Jobs::Base do
   end
 
   it 'handles errors in multisite' do
-    RailsMultisite::ConnectionManagement.expects(:all_dbs).returns(['default','default'])
-    # just stub so logs are not noisy
-    Discourse.expects(:handle_exception).returns(nil)
+    RailsMultisite::ConnectionManagement.expects(:all_dbs).returns(['default','default','default'])
+    # one exception per database
+    Discourse.expects(:handle_exception).times(3)
 
     bad = BadJob.new 
     expect{bad.perform({})}.to raise_error
-    bad.fail_count.should == 2
+    bad.fail_count.should == 3
   end
 
   it 'delegates the process call to execute' do