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1b86d90136
In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`. ```ruby # frozen_string_literal: true require "bundler/inline" gemfile(true) do source "https://rubygems.org" gem "benchmark-ips" end Benchmark.ips do |x| x.report('+@') { +"" } x.report('dup') { "".dup } x.compare! end ``` ``` $ ruby -v benchmark.rb ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux] Warming up -------------------------------------- +@ 282.289k i/100ms dup 187.638k i/100ms Calculating ------------------------------------- +@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s Comparison: +@: 6775299.3 i/s dup: 3320400.7 i/s - 2.04x slower ```
96 lines
2.4 KiB
Ruby
96 lines
2.4 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 << " (#{event.duration.round(1)}ms)"
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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 << " (#{event.duration.round(1)}ms)"
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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)} (#{event.duration.round(1)}ms)"
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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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