Avoid storing backtraces from Bitbucket Cloud imports in the database

We noticed in
https://gitlab.com/gitlab-com/gl-infra/production/issues/908 some
Bitbucket imports took over a second to load their projects row because
`import_error` was huge due to errors. To prevent this, we now:

1. Clean the backtraces
2. Log the details into importer.log
3. Omit the details from the database

1 files changed, 27 insertions, 1 deletions

diff --git a/lib/gitlab/bitbucket_import/importer.rb b/lib/gitlab/bitbucket_import/importer.rb
index c9f0ed66a54..8047ef4fa15 100644
--- a/lib/gitlab/bitbucket_import/importer.rb
+++ b/lib/gitlab/bitbucket_import/importer.rb
@@ -11,6 +11,7 @@ module Gitlab
                 { title: 'task', color: '#7F8C8D' }].freeze
 
       attr_reader :project, :client, :errors, :users
+      attr_accessor :logger
 
       def initialize(project)
         @project = project
@@ -19,6 +20,7 @@ module Gitlab
         @labels = {}
         @errors = []
         @users = {}
+        @logger = Gitlab::Import::Logger.build
       end
 
       def execute
@@ -41,6 +43,18 @@ module Gitlab
         }.to_json)
       end
 
+      def store_pull_request_error(pull_request, ex)
+        backtrace = Gitlab::Profiler.clean_backtrace(ex.backtrace)
+        error = { type: :pull_request, iid: pull_request.iid, errors: ex.message, trace: backtrace, raw_response: pull_request.raw }
+
+        log_error(error)
+        # Omit the details from the database to avoid blowing up usage in the error column
+        error.delete(:trace)
+        error.delete(:raw_response)
+
+        errors << error
+      end
+
       def gitlab_user_id(project, username)
         find_user_id(username) || project.creator_id
       end
@@ -176,7 +190,7 @@ module Gitlab
 
           import_pull_request_comments(pull_request, merge_request) if merge_request.persisted?
         rescue StandardError => e
-          errors << { type: :pull_request, iid: pull_request.iid, errors: e.message, trace: e.backtrace.join("\n"), raw_response: pull_request.raw }
+          store_pull_request_error(pull_request, e)
         end
       end
 
@@ -254,6 +268,18 @@ module Gitlab
           updated_at: comment.updated_at
         }
       end
+
+      def log_error(details)
+        logger.error(log_base_data.merge(details))
+      end
+
+      def log_base_data
+        {
+          class: self.class.name,
+          project_id: project.id,
+          project_path: project.full_path
+        }
+      end
     end
   end
 end