71 lines
2.9 KiB
Markdown
71 lines
2.9 KiB
Markdown
---
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stage: none
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group: unassigned
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
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---
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# Accessing session data
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Session data in GitLab is stored in Redis and can be accessed in a variety of ways.
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During a web request, for example:
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- Rails provides access to the session from within controllers through [`ActionDispatch::Session`](https://guides.rubyonrails.org/action_controller_overview.html#session).
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- Outside of controllers, it is possible to access the session through `Gitlab::Session`.
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Outside of a web request it is still possible to access sessions stored in Redis. For example:
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- Session IDs and contents can be [looked up directly in Redis](#redis).
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- Data about the UserAgent associated with the session can be accessed through `ActiveSession`.
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When storing values in a session it is best to:
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- Use simple primitives and avoid storing objects to avoid marshaling complications.
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- Clean up after unneeded variables to keep memory usage in Redis down.
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## GitLab::Session
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Sometimes you might want to persist data in the session instead of another store like the database. `Gitlab::Session` lets you access this without passing the session around extensively. For example, you could access it from within a policy without having to pass the session through to each place permissions are checked from.
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The session has a hash-like interface, just like when using it from a controller. There is also `NamespacedSessionStore` for storing key-value data in a hash.
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```ruby
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# Lookup a value stored in the current session
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Gitlab::Session.current[:my_feature]
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# Modify the current session stored in redis
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Gitlab::Session.current[:my_feature] = value
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# Store key-value data namespaced under a key
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Gitlab::NamespacedSessionStore.new(:my_feature)[some_key] = value
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# Set the session for a block of code, such as for tests
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Gitlab::Session.with_session(my_feature: value) do
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# Code that uses Session.current[:my_feature]
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end
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```
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## Redis
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Session data can be accessed directly through Redis. This can let you check up on a browser session when debugging.
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```ruby
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# Get a list of sessions
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session_ids = Gitlab::Redis::SharedState.with do |redis|
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redis.smembers("#{Gitlab::Redis::SharedState::USER_SESSIONS_LOOKUP_NAMESPACE}:#{user.id}")
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end
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# Retrieve a specific session
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session_data = Gitlab::Redis::SharedState.with { |redis| redis.get("#{Gitlab::Redis::SharedState::SESSION_NAMESPACE}:#{session_id}") }
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Marshal.load(session_data)
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```
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## Getting device information with ActiveSession
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The [**Active Sessions** page on a user's profile](../user/profile/active_sessions.md) displays information about the device used to access each session. The methods used there to list sessions can also be useful for development.
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```ruby
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# Get list of sessions for a given user
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# Includes session_id and data from the UserAgent
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ActiveSession.list(user)
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```
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