Commit graph

16 commits

Author SHA1 Message Date
James Lopez
80112ca4ec add note to import sources 2018-01-03 09:31:32 +01:00
Yorick Peterse
6e242e8223
Replace old GH importer with the parallel importer 2017-11-07 23:25:03 +01:00
Yorick Peterse
4dfe26cd8b
Rewrite the GitHub importer from scratch
Prior to this MR there were two GitHub related importers:

* Github::Import: the main importer used for GitHub projects
* Gitlab::GithubImport: importer that's somewhat confusingly used for
  importing Gitea projects (apparently they have a compatible API)

This MR renames the Gitea importer to Gitlab::LegacyGithubImport and
introduces a new GitHub importer in the Gitlab::GithubImport namespace.
This new GitHub importer uses Sidekiq for importing multiple resources
in parallel, though it also has the ability to import data sequentially
should this be necessary.

The new code is spread across the following directories:

* lib/gitlab/github_import: this directory contains most of the importer
  code such as the classes used for importing resources.
* app/workers/gitlab/github_import: this directory contains the Sidekiq
  workers, most of which simply use the code from the directory above.
* app/workers/concerns/gitlab/github_import: this directory provides a
  few modules that are included in every GitHub importer worker.

== Stages

The import work is divided into separate stages, with each stage
importing a specific set of data. Stages will schedule the work that
needs to be performed, followed by scheduling a job for the
"AdvanceStageWorker" worker. This worker will periodically check if all
work is completed and schedule the next stage if this is the case. If
work is not yet completed this worker will reschedule itself.

Using this approach we don't have to block threads by calling `sleep()`,
as doing so for large projects could block the thread from doing any
work for many hours.

== Retrying Work

Workers will reschedule themselves whenever necessary. For example,
hitting the GitHub API's rate limit will result in jobs rescheduling
themselves. These jobs are not processed until the rate limit has been
reset.

== User Lookups

Part of the importing process involves looking up user details in the
GitHub API so we can map them to GitLab users. The old importer used
an in-memory cache, but this obviously doesn't work when the work is
spread across different threads.

The new importer uses a Redis cache and makes sure we only perform
API/database calls if absolutely necessary.  Frequently used keys are
refreshed, and lookup misses are also cached; removing the need for
performing API/database calls if we know we don't have the data we're
looking for.

== Performance & Models

The new importer in various places uses raw INSERT statements (as
generated by `Gitlab::Database.bulk_insert`) instead of using Rails
models. This allows us to bypass any validations and callbacks,
drastically reducing the number of SQL queries and Gitaly RPC calls
necessary to import projects.

To ensure the code produces valid data the corresponding tests check if
the produced rows are valid according to the model validation rules.
2017-11-07 23:24:59 +01:00
Douglas Barbosa Alexandre
29d380b03c Set the new GitHub import as import source 2017-08-07 13:06:13 -03:00
Rémy Coutable
765d57d650
Rescue from ActiveRecord::UnknownAttributeError and fallback to fake settings
Signed-off-by: Rémy Coutable <remy@rymai.me>
2017-01-23 16:58:13 +01:00
Rémy Coutable
8fc63d1f64 Improve Gitlab::ImportSources
Signed-off-by: Rémy Coutable <remy@rymai.me>
2016-12-19 17:35:51 +01:00
Rémy Coutable
103114e3d7 Rename Gogs to Gitea, DRY the controller and improve views
Signed-off-by: Rémy Coutable <remy@rymai.me>
2016-12-19 17:35:51 +01:00
Kim "BKC" Carlbäcker
5d4531db25 Gogs Importer 2016-12-19 17:35:51 +01:00
Z.J. van de Weg
4c8e9a8d27 Remove gitorious 2016-08-25 10:10:10 +01:00
Grzegorz Bizon
9e211091a8 Enable Style/EmptyLines cop, remove redundant ones 2016-07-01 21:56:17 +02:00
James Lopez
5087e10fe9 fix specs 2016-06-16 09:01:09 +02:00
James Lopez
4bde59341f lots of refactoring again based on feedback. Changed the UI slightly and also fixed a small bug 2016-06-15 17:31:00 +02:00
James Lopez
e14d1051d2 fix import feature v2 2016-05-05 11:02:22 +02:00
James Lopez
acf297955a gitlab import UI - icon, file selector, etc... Also updated font-awesome and modified import source settings. 2016-04-22 17:44:59 +02:00
Jared Szechy
e156f42079 FogBugz project import 2015-09-08 20:23:01 -04:00
Artem Sidorenko
55dca86b98 Import sources: settings in the admin interface 2015-08-20 11:28:27 +02:00