bin/codeownership for_team should use cache (90% perf improvement) (#56)

Author: Alex Evanczuk

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    code_ownership (1.32.10)
+    code_ownership (1.32.11)
       code_teams (~> 1.0)
       packs
       sorbet-runtime

code_ownership.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = 'code_ownership'
-  spec.version       = '1.32.10'
+  spec.version       = '1.32.11'
   spec.authors       = ['Gusto Engineers']
   spec.email         = ['dev@gusto.com']
   spec.summary       = 'A gem to help engineering teams declare ownership of code'

lib/code_ownership.rb

@@ -43,27 +43,23 @@ def for_file(file)
 
   sig { params(team: T.any(CodeTeams::Team, String)).returns(String) }
   def for_team(team)
-    Private.load_configuration!
-
     team = T.must(CodeTeams.find(team)) if team.is_a?(String)
     ownership_information = T.let([], T::Array[String])
 
     ownership_information << "# Code Ownership Report for `#{team.name}` Team"
-    Mapper.all.each do |mapper|
-      ownership_information << "## #{mapper.description}"
-      codeowners_lines = mapper.globs_to_owner(Private.tracked_files)
+
+    Private.glob_cache.raw_cache_contents.each do |mapper_description, glob_to_owning_team_map|
+      ownership_information << "## #{mapper_description}"
       ownership_for_mapper = []
-      codeowners_lines.each do |line, team_for_line|
-        next if team_for_line.nil?
-        if team_for_line.name == team.name
-          ownership_for_mapper << "- #{line}"
-        end
+      glob_to_owning_team_map.each do |glob, owning_team|
+        next if owning_team != team
+        ownership_for_mapper << "- #{glob}"
       end
 
       if ownership_for_mapper.empty?
         ownership_information << 'This team owns nothing in this category.'
       else
-        ownership_information += ownership_for_mapper
+        ownership_information += ownership_for_mapper.sort
       end
 
       ownership_information << ""

lib/code_ownership/mapper.rb

@@ -68,9 +68,10 @@ def self.to_glob_cache
 
       Mapper.all.each do |mapper|
         mapped_files = mapper.globs_to_owner(Private.tracked_files)
+        glob_to_owner_map_by_mapper_description[mapper.description] ||= {}
+
         mapped_files.each do |glob, owner|
           next if owner.nil?
-          glob_to_owner_map_by_mapper_description[mapper.description] ||= {}
           glob_to_owner_map_by_mapper_description.fetch(mapper.description)[glob] = owner
         end
       end