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# 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](../administration/instance_limits.md)
and communicate those limits.
There is a guide about [introducing application
limits](https://about.gitlab.com/handbook/product/#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.
1. Add new column to the `plan_limits` table with non-null default value
that represents desired limit, eg:
```ruby
add_column(:plan_limits, :project_hooks, :integer, default: 100, null: false)
```
NOTE: **Note:** Plan limits entries set to `0` mean that limits are not
enabled. You should use this setting only in special and documented circumstances.
1. (Optionally) Create the database migration that fine-tunes each level with
a desired limit using `create_or_update_plan_limit` migration helper, eg:
```ruby
class InsertProjectHooksPlanLimits < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
def up
create_or_update_plan_limit('project_hooks', 'default', 0)
create_or_update_plan_limit('project_hooks', 'free', 10)
create_or_update_plan_limit('project_hooks', 'bronze', 20)
create_or_update_plan_limit('project_hooks', 'silver', 30)
create_or_update_plan_limit('project_hooks', 'gold', 100)
end
def down
create_or_update_plan_limit('project_hooks', 'default', 0)
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
end
```
NOTE: **Note:** Some plans exist only on GitLab.com. This will be no-op
for plans that do not exist.
### Plan limits validation
#### Get current limit
Access to the current limit can be done through the project or the namespace,
eg:
```ruby
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:
```ruby
project.actual_limits.exceeded?(:project_hooks, ProjectHook.where(project: project))
```
Ensures that the number does not exceed the defined limit, eg:
```ruby
project.actual_limits.exceeded?(:project_hooks, 10)
```
#### `Limitable` concern
The [`Limitable` concern](https://gitlab.com/gitlab-org/gitlab/blob/master/ee/app/models/concerns/ee/limitable.rb)
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.
```ruby
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.
```ruby
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.
|
