class Atatus::CentralConfig
@api private
Constants
- DEFAULT_MAX_AGE
Attributes
config[R]
promise[R]
scheduled_task[R]
Public Class Methods
new(config)
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# File lib/atatus/central_config.rb, line 40 def initialize(config) @config = config @modified_options = {} # @http = Transport::Connection::Http.new(config) @etag = 1 end
Public Instance Methods
assign(update)
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# File lib/atatus/central_config.rb, line 89 def assign(update) # For each updated option, store the original value, # unless already stored update.each_key do |key| @modified_options[key] ||= config.get(key.to_sym)&.value end # If the new update doesn't set a previously modified option, # revert it to the original @modified_options.each_key do |key| next if update.key?(key) update[key] = @modified_options.delete(key) end @config.replace_options(update) end
fetch_and_apply_config()
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# File lib/atatus/central_config.rb, line 66 def fetch_and_apply_config @promise = Concurrent::Promise .execute(&method(:fetch_config)) .on_success(&method(:handle_success)) .rescue(&method(:handle_error)) end
fetch_config()
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# File lib/atatus/central_config.rb, line 74 def fetch_config resp = perform_request case resp.status when 200..299 resp when 300..399 resp when 400..499 raise ClientError, resp when 500..599 raise ServerError, resp end end
handle_forking!()
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# File lib/atatus/central_config.rb, line 106 def handle_forking! stop start end
start()
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# File lib/atatus/central_config.rb, line 50 def start return return unless config.central_config? debug 'Starting CentralConfig' fetch_and_apply_config end
stop()
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# File lib/atatus/central_config.rb, line 59 def stop return debug 'Stopping CentralConfig' @scheduled_task&.cancel end
Private Instance Methods
handle_error(error)
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rubocop:enable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
# File lib/atatus/central_config.rb, line 143 def handle_error(error) # For tests, WebMock failures don't have real responses response = error.response if error.respond_to?(:response) debug( 'Failed fetching config: %s, trying again in %d seconds', response&.body, DEFAULT_MAX_AGE ) assign({}) schedule_next_fetch(response) end
handle_success(resp)
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rubocop:disable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
# File lib/atatus/central_config.rb, line 114 def handle_success(resp) if (etag = resp.headers['Etag']) @etag = etag end if resp.status == 304 info 'Received 304 Not Modified' else if resp.body && !resp.body.empty? update = JSON.parse(resp.body.to_s) assign(update) end if update && update.any? info 'Updated config from Kibana' debug 'Modified: %s', update.inspect debug 'Modified original options: %s', @modified_options.inspect end end schedule_next_fetch(resp) true rescue Exception => e error 'Failed to apply remote config, %s', e.inspect debug { e.backtrace.join('\n') } end
headers()
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# File lib/atatus/central_config.rb, line 168 def headers { 'Etag': @etag } end
perform_request()
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# File lib/atatus/central_config.rb, line 157 def perform_request # @http.get(server_url, headers: headers) end
schedule_next_fetch(resp = nil)
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# File lib/atatus/central_config.rb, line 172 def schedule_next_fetch(resp = nil) headers = resp&.headers seconds = if headers && headers['Cache-Control'] CacheControl.new(headers['Cache-Control']).max_age else DEFAULT_MAX_AGE end @scheduled_task = Concurrent::ScheduledTask .execute(seconds, &method(:fetch_and_apply_config)) end
server_url()
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# File lib/atatus/central_config.rb, line 161 def server_url @server_url ||= config.server_url + '/config/v1/agents' \ "?service.name=#{config.service_name}" end