Application limits development

This document provides a development guide for contributors to add application limits to GitLab.

Documentation

First of all, you have to gather information and decide which are the different limits that will be set for the different GitLab tiers. You also need to coordinate with others to document and communicate those limits.

There is a guide about introducing application limits.

Development

Insert database plan limits

In the plan_limits table, you have to create a new column and insert the limit values. It's recommended to create separate migration script files.

Add new column to the plan_limits table with non-null default value 0, eg:
```
add_column(:plan_limits, :project_hooks, :integer, default: 0, null: false)
```
NOTE: Note: Plan limits entries set to 0 mean that limits are not enabled.

Insert plan limits values into the database using create_or_update_plan_limit migration helper, eg:

def up
  return unless Gitlab.com?

  create_or_update_plan_limit('project_hooks', 'free', 100)
  create_or_update_plan_limit('project_hooks', 'bronze', 100)
  create_or_update_plan_limit('project_hooks', 'silver', 100)
  create_or_update_plan_limit('project_hooks', 'gold', 100)
end

def down
  return unless Gitlab.com?

  create_or_update_plan_limit('project_hooks', 'free', 0)
  create_or_update_plan_limit('project_hooks', 'bronze', 0)
  create_or_update_plan_limit('project_hooks', 'silver', 0)
  create_or_update_plan_limit('project_hooks', 'gold', 0)
end

NOTE: Note: Some plans exist only on GitLab.com. You can check if the migration is running on GitLab.com with Gitlab.com?.

Plan limits validation

Get current limit

Access to the current limit can be done through the project or the namespace, eg:

project.actual_limits.project_hooks

Check current limit

There is one method PlanLimits#exceeded? to check if the current limit is being exceeded. You can use either an ActiveRecord object or an Integer.

Ensures that the count of the records does not exceed the defined limit, eg:

project.actual_limits.exceeded?(:project_hooks, ProjectHook.where(project: project))

Ensures that the number does not exceed the defined limit, eg:

project.actual_limits.exceeded?(:project_hooks, 10)

`Limitable` concern

The Limitable concern can be used to validate that a model does not exceed the limits. It ensures that the count of the records for the current model does not exceed the defined limit.

NOTE: Note: You must specify the limit scope of the object being validated and the limit name if it's different from the pluralized model name.

class ProjectHook
  include Limitable

  self.limit_name = 'project_hooks' # Optional as ProjectHook corresponds with project_hooks
  self.limit_scope = :project
end

To test the model, you can include the shared examples.

it_behaves_like 'includes Limitable concern' do
  subject { build(:project_hook, project: create(:project)) }
end

Subscription Plans

Self-managed:

default - Everyone

GitLab.com:

free - Everyone
bronze- Namespaces with a Bronze subscription
silver - Namespaces with a Silver subscription
gold - Namespaces with a Gold subscription

NOTE: Note: The test environment doesn't have any plans.

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