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e8c1be4ae7
This PR adds the allocations to the instrumentation for template and partial rendering. Before: ``` Rendering posts/new.html.erb within layouts/application Rendered posts/_form.html.erb (9.7ms) Rendered posts/new.html.erb within layouts/application (10.9ms) Completed 200 OK in 902ms (Views: 890.8ms | ActiveRecord: 0.8ms) ``` After: ``` Rendering posts/new.html.erb within layouts/application Rendered posts/_form.html.erb (Duration: 7.1ms | Allocations: 6004) Rendered posts/new.html.erb within layouts/application (Duration: 8.3ms | Allocations: 6654) Completed 200 OK in 858ms (Views: 848.4ms | ActiveRecord: 0.4ms | Allocations: 1539564) ```
96 lines
2.5 KiB
Ruby
96 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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require "active_support/log_subscriber"
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module ActionView
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# = Action View Log Subscriber
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#
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# Provides functionality so that Rails can output logs from Action View.
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class LogSubscriber < ActiveSupport::LogSubscriber
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VIEWS_PATTERN = /^app\/views\//
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def initialize
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@root = nil
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super
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end
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def render_template(event)
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info do
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message = +" Rendered #{from_rails_root(event.payload[:identifier])}"
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message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
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message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
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end
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end
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def render_partial(event)
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info do
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message = +" Rendered #{from_rails_root(event.payload[:identifier])}"
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message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
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message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
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message << " #{cache_message(event.payload)}" unless event.payload[:cache_hit].nil?
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message
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end
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end
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def render_collection(event)
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identifier = event.payload[:identifier] || "templates"
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info do
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" Rendered collection of #{from_rails_root(identifier)}" \
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" #{render_count(event.payload)} (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
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end
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end
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def start(name, id, payload)
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if name == "render_template.action_view"
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log_rendering_start(payload)
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end
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super
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end
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def logger
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ActionView::Base.logger
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end
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private
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EMPTY = ""
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def from_rails_root(string) # :doc:
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string = string.sub(rails_root, EMPTY)
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string.sub!(VIEWS_PATTERN, EMPTY)
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string
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end
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def rails_root # :doc:
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@root ||= "#{Rails.root}/"
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end
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def render_count(payload) # :doc:
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if payload[:cache_hits]
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"[#{payload[:cache_hits]} / #{payload[:count]} cache hits]"
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else
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"[#{payload[:count]} times]"
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end
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end
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def cache_message(payload) # :doc:
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case payload[:cache_hit]
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when :hit
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"[cache hit]"
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when :miss
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"[cache miss]"
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end
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end
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def log_rendering_start(payload)
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info do
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message = +" Rendering #{from_rails_root(payload[:identifier])}"
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message << " within #{from_rails_root(payload[:layout])}" if payload[:layout]
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message
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end
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end
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end
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end
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ActionView::LogSubscriber.attach_to :action_view
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