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process_observer.rb
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process_observer.rb
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module VCAP::CloudController
module ProcessObserver
class << self
extend Forwardable
def configure(stagers, runners)
@stagers = stagers
@runners = runners
end
def deleted(process)
with_diego_communication_handling do
@runners.runner_for_process(process).stop
end
end
def updated(process)
changes = process.previous_changes
return unless changes
with_diego_communication_handling do
if changes.key?(:state) || changes.key?(:diego) || changes.key?(:enable_ssh) || changes.key?(:ports)
react_to_state_change(process)
elsif changes.key?(:instances)
react_to_instances_change(process)
end
end
end
private
def react_to_state_change(process)
unless process.started?
@runners.runner_for_process(process).stop
return
end
process.update(revision: process.app.latest_revision) if process.revisions_enabled?
@runners.runner_for_process(process).start unless process.needs_staging?
end
def react_to_instances_change(process)
@runners.runner_for_process(process).scale if process.started? && process.active?
end
def with_diego_communication_handling
yield
rescue Diego::Runner::CannotCommunicateWithDiegoError => e
logger.error("Failed communicating with diego backend: #{e.message}. Continuing, sync job should eventually re-sync any desired changes to diego.")
end
def logger
@logger ||= Steno.logger('cc.process_observer')
end
end
end
end