FIX: Always unpause Sidekiq after backup and restore

* Logs exceptions during the cleanup phase, but doesn't stop executing subsequent cleanup tasks.
* Notifies the user at the end of the cleanup phase, so that the log contains possible errors during that phase.

lib/backup_restore/backuper.rb

@@ -54,13 +54,10 @@ module BackupRestore
       @success = true
       File.join(@archive_directory, @backup_filename)
     ensure
-      begin
-        notify_user
-        remove_old
-        clean_up
-      rescue => ex
-        Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n"))
-      end
+      remove_old
+      clean_up
+      notify_user
+      log "Finished!"
 
       @success ? log("[SUCCESS]") : log("[FAILED]")
     end
@@ -255,6 +252,8 @@ module BackupRestore
     def remove_old
       log "Removing old backups..."
       Backup.remove_old
+    rescue => ex
+      log "Something went wrong while removing old backups.", ex
     end
 
     def notify_user
@@ -270,6 +269,8 @@ module BackupRestore
       end
 
       post
+    rescue => ex
+      log "Something went wrong while notifying user.", ex
     end
 
     def clean_up
@@ -279,42 +280,49 @@ module BackupRestore
       disable_readonly_mode if Discourse.readonly_mode?
       mark_backup_as_not_running
       refresh_disk_space
-      log "Finished!"
     end
 
     def refresh_disk_space
-      log "Refreshing disk cache..."
+      log "Refreshing disk stats..."
       DiskSpace.reset_cached_stats
+    rescue => ex
+      log "Something went wrong while refreshing disk stats.", ex
     end
 
     def remove_tar_leftovers
       log "Removing '.tar' leftovers..."
       Dir["#{@archive_directory}/*.tar"].each { |filename| File.delete(filename) }
+    rescue => ex
+      log "Something went wrong while removing '.tar' leftovers.", ex
     end
 
     def remove_tmp_directory
       log "Removing tmp '#{@tmp_directory}' directory..."
       FileUtils.rm_rf(@tmp_directory) if Dir[@tmp_directory].present?
-    rescue
-      log "Something went wrong while removing the following tmp directory: #{@tmp_directory}"
+    rescue => ex
+      log "Something went wrong while removing the following tmp directory: #{@tmp_directory}", ex
     end
 
     def unpause_sidekiq
       log "Unpausing sidekiq..."
       Sidekiq.unpause!
-    rescue
-      log "Something went wrong while unpausing Sidekiq."
+    rescue => ex
+      log "Something went wrong while unpausing Sidekiq.", ex
     end
 
     def disable_readonly_mode
       return if @readonly_mode_was_enabled
       log "Disabling readonly mode..."
       Discourse.disable_readonly_mode
+    rescue => ex
+      log "Something went wrong while disabling readonly mode.", ex
     end
 
     def mark_backup_as_not_running
       log "Marking backup as finished..."
       BackupRestore.mark_as_not_running!
+    rescue => ex
+      log "Something went wrong while marking backup as finished.", ex
     end
 
     def ensure_directory_exists(directory)
@@ -322,11 +330,12 @@ module BackupRestore
       FileUtils.mkdir_p(directory)
     end
 
-    def log(message)
+    def log(message, ex = nil)
       timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
       puts(message)
       publish_log(message, timestamp)
       save_log(message, timestamp)
+      Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n")) if ex
     end
 
     def publish_log(message, timestamp)

lib/backup_restore/restorer.rb

@@ -103,12 +103,9 @@ module BackupRestore
     else
       @success = true
     ensure
-      begin
-        notify_user
-        clean_up
-      rescue => ex
-        Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n"))
-      end
+      clean_up
+      notify_user
+      log "Finished!"
 
       @success ? log("[SUCCESS]") : log("[FAILED]")
     end
@@ -459,6 +456,8 @@ module BackupRestore
       else
         log "Could not send notification to '#{@user_info[:username]}' (#{@user_info[:email]}), because the user does not exists..."
       end
+    rescue => ex
+      log "Something went wrong while notifying user.", ex
     end
 
     def clean_up
@@ -467,32 +466,35 @@ module BackupRestore
       unpause_sidekiq
       disable_readonly_mode if Discourse.readonly_mode?
       mark_restore_as_not_running
-      log "Finished!"
     end
 
     def remove_tmp_directory
       log "Removing tmp '#{@tmp_directory}' directory..."
       FileUtils.rm_rf(@tmp_directory) if Dir[@tmp_directory].present?
-    rescue
-      log "Something went wrong while removing the following tmp directory: #{@tmp_directory}"
+    rescue => ex
+      log "Something went wrong while removing the following tmp directory: #{@tmp_directory}", ex
     end
 
     def unpause_sidekiq
       log "Unpausing sidekiq..."
       Sidekiq.unpause!
-    rescue
-      log "Something went wrong while unpausing Sidekiq."
+    rescue => ex
+      log "Something went wrong while unpausing Sidekiq.", ex
     end
 
     def disable_readonly_mode
       return if @readonly_mode_was_enabled
       log "Disabling readonly mode..."
       Discourse.disable_readonly_mode
+    rescue => ex
+      log "Something went wrong while disabling readonly mode.", ex
     end
 
     def mark_restore_as_not_running
       log "Marking restore as finished..."
       BackupRestore.mark_as_not_running!
+    rescue => ex
+      log "Something went wrong while marking restore as finished.", ex
     end
 
     def ensure_directory_exists(directory)
@@ -500,11 +502,12 @@ module BackupRestore
       FileUtils.mkdir_p(directory)
     end
 
-    def log(message)
+    def log(message, ex = nil)
       timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
       puts(message)
       publish_log(message, timestamp)
       save_log(message, timestamp)
+      Rails.logger.error("#{ex}\n" + ex.backtrace.join("\n")) if ex
     end
 
     def publish_log(message, timestamp)