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module Users
# Service for refreshing the authorized projects of a user.
#
# This particular service class can not be used to update data for the same
# user concurrently. Doing so could lead to an incorrect state. To ensure this
# doesn't happen a caller must synchronize access (e.g. using
# `Gitlab::ExclusiveLease`).
#
# Usage:
#
# user = User.find_by(username: 'alice')
# service = Users::RefreshAuthorizedProjectsService.new(some_user)
# service.execute
class RefreshAuthorizedProjectsService
attr_reader :user
LEASE_TIMEOUT = 1.minute.to_i
# user - The User for which to refresh the authorized projects.
def initialize(user)
@user = user
# We need an up to date User object that has access to all relations that
# may have been created earlier. The only way to ensure this is to reload
# the User object.
user.reload
end
def execute
lease_key = "refresh_authorized_projects:#{user.id}"
lease = Gitlab::ExclusiveLease.new(lease_key, timeout: LEASE_TIMEOUT)
until uuid = lease.try_obtain
# Keep trying until we obtain the lease. If we don't do so we may end up
# not updating the list of authorized projects properly. To prevent
# hammering Redis too much we'll wait for a bit between retries.
sleep(0.1)
end
begin
execute_without_lease
ensure
Gitlab::ExclusiveLease.cancel(lease_key, uuid)
end
end
# This method returns the updated User object.
def execute_without_lease
current = current_authorizations_per_project
fresh = fresh_access_levels_per_project
remove = current.each_with_object([]) do |(project_id, row), array|
# rows not in the new list or with a different access level should be
# removed.
if !fresh[project_id] || fresh[project_id] != row.access_level
array << row.project_id
end
end
add = fresh.each_with_object([]) do |(project_id, level), array|
# rows not in the old list or with a different access level should be
# added.
if !current[project_id] || current[project_id].access_level != level
array << [user.id, project_id, level]
end
end
update_authorizations(remove, add)
end
# Updates the list of authorizations for the current user.
#
# remove - The IDs of the authorization rows to remove.
# add - Rows to insert in the form `[user id, project id, access level]`
def update_authorizations(remove = [], add = [])
return if remove.empty? && add.empty?
User.transaction do
user.remove_project_authorizations(remove) unless remove.empty?
ProjectAuthorization.insert_authorizations(add) unless add.empty?
end
# Since we batch insert authorization rows, Rails' associations may get
# out of sync. As such we force a reload of the User object.
user.reload
end
def fresh_access_levels_per_project
fresh_authorizations.each_with_object({}) do |row, hash|
hash[row.project_id] = row.access_level
end
end
def current_authorizations_per_project
current_authorizations.index_by(&:project_id)
end
def current_authorizations
user.project_authorizations.select(:project_id, :access_level)
end
def fresh_authorizations
klass = if Group.supports_nested_groups?
Gitlab::ProjectAuthorizations::WithNestedGroups
else
Gitlab::ProjectAuthorizations::WithoutNestedGroups
end
klass.new(user).calculate
end
end
end
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