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# frozen_string_literal: true
require "active_support/log_subscriber"
module ActionView
# = Action View Log Subscriber
#
# Provides functionality so that Rails can output logs from Action View.
class LogSubscriber < ActiveSupport::LogSubscriber
VIEWS_PATTERN = /^app\/views\//
def initialize
@root = nil
super
end
def render_template(event)
info do
message = +" Rendered #{from_rails_root(event.payload[:identifier])}"
message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
end
end
def render_partial(event)
info do
message = +" Rendered #{from_rails_root(event.payload[:identifier])}"
message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
message << " #{cache_message(event.payload)}" unless event.payload[:cache_hit].nil?
message
end
end
def render_collection(event)
identifier = event.payload[:identifier] || "templates"
info do
" Rendered collection of #{from_rails_root(identifier)}" \
" #{render_count(event.payload)} (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
end
end
def start(name, id, payload)
if name == "render_template.action_view"
log_rendering_start(payload)
end
super
end
def logger
ActionView::Base.logger
end
private
EMPTY = ""
def from_rails_root(string) # :doc:
string = string.sub(rails_root, EMPTY)
string.sub!(VIEWS_PATTERN, EMPTY)
string
end
def rails_root # :doc:
@root ||= "#{Rails.root}/"
end
def render_count(payload) # :doc:
if payload[:cache_hits]
"[#{payload[:cache_hits]} / #{payload[:count]} cache hits]"
else
"[#{payload[:count]} times]"
end
end
def cache_message(payload) # :doc:
case payload[:cache_hit]
when :hit
"[cache hit]"
when :miss
"[cache miss]"
end
end
def log_rendering_start(payload)
info do
message = +" Rendering #{from_rails_root(payload[:identifier])}"
message << " within #{from_rails_root(payload[:layout])}" if payload[:layout]
message
end
end
end
end
ActionView::LogSubscriber.attach_to :action_view
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