Commit 287fe603 authored by Doug Barrett's avatar Doug Barrett 🔴
Browse files

perf: combine regex patterns for efficient path matching 

Combine IGNORE_PATHS and wrapper_patterns into a single Regexp.union
for efficient matching. Cache is invalidated when patterns change.

Relates-to: #60
parent cb5f4827

lib/labkit/logging/field_validator/log_interceptor.rb

+8 −2
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ module Labkit 
        class << self

          def register_wrapper_pattern(pattern)

            wrapper_patterns << pattern

            @combined_ignore_pattern = nil

          end



          def wrapper_patterns
@@ -26,6 +27,11 @@ module Labkit 


          def reset_wrapper_patterns!

            @wrapper_patterns = nil

            @combined_ignore_pattern = nil

          end



          def combined_ignore_pattern

            @combined_ignore_pattern ||= Regexp.union(IGNORE_PATHS + wrapper_patterns)

          end

        end
@@ -66,13 +72,13 @@ module Labkit 
        def determine_callsite

          locations = caller_locations(INTERNAL_FRAMES_TO_SKIP, MAX_FRAMES_TO_INSPECT) || []

          locations = caller_locations(1, MAX_FRAMES_TO_INSPECT) || [] if locations.empty?

          ignore_pattern = LogInterceptor.combined_ignore_pattern



          locations.find do |loc|

            path = loc.path



            next if path == __FILE__

            next if IGNORE_PATHS.any? { |pattern| pattern.match?(path) }

            next if LogInterceptor.wrapper_patterns.any? { |pattern| pattern.match?(path) }

            next if ignore_pattern.match?(path)



            true

          end

spec/labkit/logging/field_validator/log_interceptor_spec.rb

+39 −0
Original line number Diff line number Diff line
@@ -175,6 +175,13 @@ RSpec.describe Labkit::Logging::FieldValidator::LogInterceptor do 


        expect(described_class.wrapper_patterns).to include(%r{/custom_logger\.rb$})

      end



      it 'invalidates the combined_ignore_pattern cache' do

        initial_pattern = described_class.combined_ignore_pattern

        described_class.register_wrapper_pattern(%r{/custom_logger\.rb$})



        expect(described_class.combined_ignore_pattern).not_to eq(initial_pattern)

      end

    end



    describe '.wrapper_patterns' do
@@ -193,6 +200,38 @@ RSpec.describe Labkit::Logging::FieldValidator::LogInterceptor do 


        expect(described_class.wrapper_patterns).not_to include(%r{/custom\.rb$})

      end



      it 'invalidates the combined_ignore_pattern cache' do

        described_class.register_wrapper_pattern(%r{/custom\.rb$})

        pattern_with_custom = described_class.combined_ignore_pattern



        described_class.reset_wrapper_patterns!



        expect(described_class.combined_ignore_pattern).not_to eq(pattern_with_custom)

      end

    end



    describe '.combined_ignore_pattern' do

      after do

        described_class.reset_wrapper_patterns!

      end



      it 'returns a Regexp that combines IGNORE_PATHS and wrapper_patterns' do

        pattern = described_class.combined_ignore_pattern



        expect(pattern).to be_a(Regexp)

        expect(pattern).to match('/gems/logger-1.0.0/lib/logger.rb')

        expect(pattern).to match('/lib/labkit/logging/json_logger.rb')

        expect(pattern).to match('/app/lib/my_logger.rb')

        expect(pattern).not_to match('/app/models/user.rb')

      end



      it 'is cached for performance' do

        pattern1 = described_class.combined_ignore_pattern

        pattern2 = described_class.combined_ignore_pattern



        expect(pattern1).to be(pattern2)

      end

    end

  end

end