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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
89 lines
2.5 KiB
Ruby
89 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# see https://samsaffron.com/archive/2017/10/18/fastest-way-to-profile-a-method-in-ruby
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class MethodProfiler
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def self.patch(klass, methods, name, no_recurse: false)
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patches = methods.map do |method_name|
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recurse_protection = ""
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if no_recurse
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recurse_protection = <<~RUBY
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return #{method_name}__mp_unpatched(*args, &blk) if @mp_recurse_protect_#{method_name}
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@mp_recurse_protect_#{method_name} = true
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RUBY
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end
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<<~RUBY
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unless defined?(#{method_name}__mp_unpatched)
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alias_method :#{method_name}__mp_unpatched, :#{method_name}
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def #{method_name}(*args, &blk)
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unless prof = Thread.current[:_method_profiler]
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return #{method_name}__mp_unpatched(*args, &blk)
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end
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#{recurse_protection}
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begin
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start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
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#{method_name}__mp_unpatched(*args, &blk)
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ensure
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data = (prof[:#{name}] ||= {duration: 0.0, calls: 0})
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data[:duration] += Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
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data[:calls] += 1
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#{"@mp_recurse_protect_#{method_name} = false" if no_recurse}
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end
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end
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end
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RUBY
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end.join("\n")
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klass.class_eval patches
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end
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def self.transfer
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result = Thread.current[:_method_profiler]
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Thread.current[:_method_profiler] = nil
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result
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end
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def self.start(transfer = nil)
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Thread.current[:_method_profiler] = transfer || {
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__start: Process.clock_gettime(Process::CLOCK_MONOTONIC)
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}
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end
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def self.clear
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Thread.current[:_method_profiler] = nil
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end
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def self.stop
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finish = Process.clock_gettime(Process::CLOCK_MONOTONIC)
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if data = Thread.current[:_method_profiler]
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Thread.current[:_method_profiler] = nil
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start = data.delete(:__start)
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data[:total_duration] = finish - start
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end
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data
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end
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def self.ensure_discourse_instrumentation!
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@@instrumentation_setup ||= begin
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MethodProfiler.patch(PG::Connection, [
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:exec, :async_exec, :exec_prepared, :send_query_prepared, :query, :exec_params
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], :sql)
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MethodProfiler.patch(Redis::Client, [
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:call, :call_pipeline
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], :redis)
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MethodProfiler.patch(Net::HTTP, [
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:request
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], :net, no_recurse: true)
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MethodProfiler.patch(Excon::Connection, [
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:request
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], :net)
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true
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end
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end
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end
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