mirror of
https://github.com/discourse/discourse.git
synced 2024-12-12 07:53:58 +08:00
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
|
|
|
|
# see https://samsaffron.com/archive/2017/10/18/fastest-way-to-profile-a-method-in-ruby
|
|
class MethodProfiler
|
|
def self.patch(klass, methods, name, no_recurse: false)
|
|
patches = methods.map do |method_name|
|
|
|
|
recurse_protection = ""
|
|
if no_recurse
|
|
recurse_protection = <<~RUBY
|
|
return #{method_name}__mp_unpatched(*args, &blk) if @mp_recurse_protect_#{method_name}
|
|
@mp_recurse_protect_#{method_name} = true
|
|
RUBY
|
|
end
|
|
|
|
<<~RUBY
|
|
unless defined?(#{method_name}__mp_unpatched)
|
|
alias_method :#{method_name}__mp_unpatched, :#{method_name}
|
|
def #{method_name}(*args, &blk)
|
|
unless prof = Thread.current[:_method_profiler]
|
|
return #{method_name}__mp_unpatched(*args, &blk)
|
|
end
|
|
#{recurse_protection}
|
|
begin
|
|
start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
|
|
#{method_name}__mp_unpatched(*args, &blk)
|
|
ensure
|
|
data = (prof[:#{name}] ||= {duration: 0.0, calls: 0})
|
|
data[:duration] += Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
|
|
data[:calls] += 1
|
|
#{"@mp_recurse_protect_#{method_name} = false" if no_recurse}
|
|
end
|
|
end
|
|
end
|
|
RUBY
|
|
end.join("\n")
|
|
|
|
klass.class_eval patches
|
|
end
|
|
|
|
def self.transfer
|
|
result = Thread.current[:_method_profiler]
|
|
Thread.current[:_method_profiler] = nil
|
|
result
|
|
end
|
|
|
|
def self.start(transfer = nil)
|
|
Thread.current[:_method_profiler] = transfer || {
|
|
__start: Process.clock_gettime(Process::CLOCK_MONOTONIC)
|
|
}
|
|
end
|
|
|
|
def self.clear
|
|
Thread.current[:_method_profiler] = nil
|
|
end
|
|
|
|
def self.stop
|
|
finish = Process.clock_gettime(Process::CLOCK_MONOTONIC)
|
|
if data = Thread.current[:_method_profiler]
|
|
Thread.current[:_method_profiler] = nil
|
|
start = data.delete(:__start)
|
|
data[:total_duration] = finish - start
|
|
end
|
|
data
|
|
end
|
|
|
|
def self.ensure_discourse_instrumentation!
|
|
@@instrumentation_setup ||= begin
|
|
MethodProfiler.patch(PG::Connection, [
|
|
:exec, :async_exec, :exec_prepared, :send_query_prepared, :query, :exec_params
|
|
], :sql)
|
|
|
|
MethodProfiler.patch(Redis::Client, [
|
|
:call, :call_pipeline
|
|
], :redis)
|
|
|
|
MethodProfiler.patch(Net::HTTP, [
|
|
:request
|
|
], :net, no_recurse: true)
|
|
|
|
MethodProfiler.patch(Excon::Connection, [
|
|
:request
|
|
], :net)
|
|
true
|
|
end
|
|
end
|
|
|
|
end
|