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# frozen_string_literal: true
require 'ruby-prof'
require 'memory_profiler'
module Gitlab
module RequestProfiler
class Middleware
def initialize(app)
@app = app
end
def call(env)
if profile?(env)
call_with_profiling(env)
else
@app.call(env)
end
end
def profile?(env)
header_token = env['HTTP_X_PROFILE_TOKEN']
return unless header_token.present?
profile_token = Gitlab::RequestProfiler.profile_token
return unless profile_token.present?
header_token == profile_token
end
def call_with_profiling(env)
case env['HTTP_X_PROFILE_MODE']
when 'execution', nil
call_with_call_stack_profiling(env)
when 'memory'
call_with_memory_profiling(env)
else
raise ActionController::BadRequest, invalid_profile_mode(env)
end
end
def invalid_profile_mode(env)
<<~HEREDOC
Invalid X-Profile-Mode: #{env['HTTP_X_PROFILE_MODE']}.
Supported profile mode request header:
- X-Profile-Mode: execution
- X-Profile-Mode: memory
HEREDOC
end
def call_with_call_stack_profiling(env)
ret = nil
report = RubyProf::Profile.profile do
ret = catch(:warden) do
@app.call(env)
end
end
generate_report(env, 'execution', 'html') do |file|
printer = RubyProf::CallStackPrinter.new(report)
printer.print(file)
end
handle_request_ret(ret)
end
def call_with_memory_profiling(env)
ret = nil
report = MemoryProfiler.report do
ret = catch(:warden) do
@app.call(env)
end
end
generate_report(env, 'memory', 'txt') do |file|
report.pretty_print(to_file: file)
end
handle_request_ret(ret)
end
def generate_report(env, report_type, extension)
file_name = "#{env['PATH_INFO'].tr('/', '|')}_#{Time.current.to_i}"\
"_#{report_type}.#{extension}"
file_path = "#{PROFILES_DIR}/#{file_name}"
FileUtils.mkdir_p(PROFILES_DIR)
begin
File.open(file_path, 'wb') do |file|
yield(file)
end
rescue
FileUtils.rm(file_path)
end
end
def handle_request_ret(ret)
if ret.is_a?(Array)
ret
else
throw(:warden, ret)
end
end
end
end
end
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