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module Users
# Service class for caching and retrieving the last push event of a user.
class LastPushEventService
EXPIRATION = 2.hours
def initialize(user)
@user = user
end
# Caches the given push event for the current user in the Rails cache.
#
# event - An instance of PushEvent to cache.
def cache_last_push_event(event)
keys = [
project_cache_key(event.project),
user_cache_key
]
if forked_from = event.project.forked_from_project
keys << project_cache_key(forked_from)
end
keys.each { |key| set_key(key, event.id) }
end
# Returns the last PushEvent for the current user.
#
# This method will return nil if no event was found.
def last_event_for_user
find_cached_event(user_cache_key)
end
# Returns the last PushEvent for the current user and the given project.
#
# project - An instance of Project for which to retrieve the PushEvent.
#
# This method will return nil if no event was found.
def last_event_for_project(project)
find_cached_event(project_cache_key(project))
end
def find_cached_event(cache_key)
event_id = get_key(cache_key)
return unless event_id
unless (event = find_event_in_database(event_id))
# We don't want to keep querying the same data over and over when a
# merge request has been created, thus we remove the key if no event
# (meaning an MR was created) is returned.
Rails.cache.delete(cache_key)
end
event
end
private
def find_event_in_database(id)
PushEvent
.without_existing_merge_requests
.find_by(id: id)
end
def user_cache_key
"last-push-event/#{@user.id}"
end
def project_cache_key(project)
"last-push-event/#{@user.id}/#{project.id}"
end
def get_key(key)
Rails.cache.read(key, raw: true)
end
def set_key(key, value)
# We're using raw values here since this takes up less space and we don't
# store complex objects.
Rails.cache.write(key, value, raw: true, expires_in: EXPIRATION)
end
end
end
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