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# frozen_string_literal: true
module Labkit
module Tracing
module Rails
module ActionView
# ActionView bridges action view notifications to
# the distributed tracing subsystem
class Subscriber
include Labkit::Tracing::TracingCommon
RENDER_TEMPLATE_NOTIFICATION_TOPIC = "render_template.action_view"
RENDER_COLLECTION_NOTIFICATION_TOPIC = "render_collection.action_view"
RENDER_PARTIAL_NOTIFICATION_TOPIC = "render_partial.action_view"
# Instruments Rails ActionView events for opentracing.
# Returns a lambda, which, when called will unsubscribe from the notifications
def self.instrument
subscriptions = [
::ActiveSupport::Notifications.subscribe(RENDER_TEMPLATE_NOTIFICATION_TOPIC, RenderTemplateInstrumenter.new),
::ActiveSupport::Notifications.subscribe(RENDER_COLLECTION_NOTIFICATION_TOPIC, RenderCollectionInstrumenter.new),
::ActiveSupport::Notifications.subscribe(RENDER_PARTIAL_NOTIFICATION_TOPIC, RenderPartialInstrumenter.new),
]
create_unsubscriber subscriptions
end
end
end
end
end
end
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