Setup Phabricator import

This sets up all the basics for importing Phabricator tasks into
GitLab issues.

To import all tasks from a Phabricator instance into GitLab, we'll
import all of them into a new project that will have its repository
disabled.

The import is hooked into a regular ProjectImport setup, but similar
to the GitHub parallel importer takes care of all the imports itself.

In this iteration, we're importing each page of tasks in a separate
sidekiq job.

The first thing we do when requesting a new page of tasks is schedule
the next page to be imported. But to avoid deadlocks, we only allow a
single job per worker type to run at the same time.

For now we're only importing basic Issue information, this should be
extended to richer information.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/gitlab/http.rb b/lib/gitlab/http.rb
index bcd9e2be35f..313b5df51d4 100644
--- a/lib/gitlab/http.rb
+++ b/lib/gitlab/http.rb
@@ -9,6 +9,13 @@ module Gitlab
     BlockedUrlError = Class.new(StandardError)
     RedirectionTooDeep = Class.new(StandardError)
 
+    HTTP_ERRORS = [
+      SocketError, OpenSSL::SSL::SSLError, Errno::ECONNRESET,
+      Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Net::OpenTimeout,
+      Net::ReadTimeout, Gitlab::HTTP::BlockedUrlError,
+      Gitlab::HTTP::RedirectionTooDeep
+    ].freeze
+
     include HTTParty # rubocop:disable Gitlab/HTTParty
 
     connection_adapter ProxyHTTPConnectionAdapter