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# frozen_string_literal: true
require "base64"
class VersionCheck
include ReactiveCaching
## Version Check Reactive Caching
## This cache stores the external API response from https://version.gitlab.com
##
## Example API Response
## {
## "latest_version": "15.2.2",
## "severity": "success"
## }
##
## This response from this endpoint only changes in 2 scenarios:
## 1. Customer upgrades their GitLab Instance
## 2. GitLab releases a new version
##
## We use GitLab::VERSION as the identifier for the cached information.
## This means if the user upgrades their version we will create a new cache record.
## The old one will be invalidated and cleaned up at the end of the self.reactive_cache_lifetime.
##
## - self.reactive_cache_refresh_interval = 12.hours
## We want to prevent as many external API calls as possible to save on resources.
## Since an EXISTING cache record will only become "invalid" if GitLab releases a new version we
## determined that 12 hour intervals is enough of a window to capture an available upgrade.
##
## - self.reactive_cache_lifetime = 7.days
## We don't want the data to be missing every time a user revisits a page using this info.
## Thus 7 days seems like a fair amount of time before we erase the cache.
## This also will handle cleaning up old cache records as they will no longer be accessed after an upgrade.
##
self.reactive_cache_refresh_interval = 12.hours
self.reactive_cache_lifetime = 7.days
self.reactive_cache_work_type = :external_dependency
self.reactive_cache_worker_finder = ->(_id, *args) { from_cache }
def self.data
{ version: Gitlab::VERSION }
end
def self.headers
{ "REFERER": Gitlab.config.gitlab.url }
end
def self.url
encoded_data = Base64.urlsafe_encode64(data.to_json)
"#{host}/check.json?gitlab_info=#{encoded_data}"
end
def self.host
'https://version.gitlab.com'
end
def self.from_cache(*)
new
end
def id
Gitlab::VERSION
end
def calculate_reactive_cache(*)
response = Gitlab::HTTP.try_get(self.class.url, headers: self.class.headers)
case response&.code
when 200
response.body
end
end
def response
with_reactive_cache do |data|
Gitlab::Json.parse(data) if data
end
end
end
VersionCheck.prepend_mod
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