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module Gitlab
module Metrics
module Subscribers
# Class for tracking the rendering timings of views.
class ActionView < ActiveSupport::Subscriber
attach_to :action_view
SERIES = 'views'
def render_template(event)
track(event) if current_transaction
end
alias_method :render_view, :render_template
private
def track(event)
values = values_for(event)
tags = tags_for(event)
current_transaction.increment(:view_duration, event.duration)
current_transaction.add_metric(SERIES, values, tags)
end
def relative_path(path)
path.gsub(/^#{Rails.root.to_s}\/?/, '')
end
def values_for(event)
{ duration: event.duration }
end
def tags_for(event)
path = relative_path(event.payload[:identifier])
tags = { view: path }
file, line = Metrics.last_relative_application_frame
if file and line
tags[:file] = file
tags[:line] = line
end
tags
end
def current_transaction
Transaction.current
end
end
end
end
end
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