Speedup loading very large OADs by deferring Schema instances

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 2.7.1
+
+- Speedup loading very large OADs by deferring creation of JSONSchemer::Schema instances.
+
 ## 2.7.0
 
 - Allow to override path for schema matching with `config.path = ->(request) { '/prefix' + request.path  } ` (https://github.com/ahx/openapi_first/issues/349)

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    openapi_first (2.7.0)
+    openapi_first (2.7.1)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)
@@ -80,7 +80,7 @@ GEM
     prism (1.4.0)
     racc (1.8.1)
     rack (3.1.13)
-    rack-session (2.1.0)
+    rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)
@@ -106,11 +106,11 @@ GEM
     rspec-expectations (3.13.4)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.3)
+    rspec-mocks (3.13.4)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.3)
-    rubocop (1.75.4)
+    rubocop (1.75.5)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)

benchmarks/Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    openapi_first (2.7.0)
+    openapi_first (2.7.1)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)
@@ -46,7 +46,7 @@ GEM
       base64 (>= 0.1.0)
       logger (>= 1.6.0)
       rack (>= 3.0.0, < 4)
-    rack-session (2.1.0)
+    rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     regexp_parser (2.10.0)

examples/rails_app/Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    openapi_first (2.7.0)
+    openapi_first (2.7.1)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)

lib/openapi_first/ref_resolver.rb

@@ -127,9 +127,31 @@ def each
       # You have to pass configuration or ref_resolver
       def schema(options)
         base_uri = URI::File.build({ path: "#{dir}/" })
-        root = JSONSchemer::Schema.new(context, base_uri:, **options)
-        # binding.irb if value['maxItems'] == 4
-        JSONSchemer::Schema.new(value, nil, root, base_uri:, **options)
+        Schema.new(value:, context:, base_uri:, options:)
+      end
+    end
+
+    # @visibility private
+    # Defers initialization JSONSchemer::Schema, because that takes time.
+    class Schema
+      extend Forwardable
+
+      def initialize(value:, context:, base_uri:, options:)
+        @value = value
+        @context = context
+        @base_uri = base_uri
+        @options = options
+      end
+
+      attr_reader :value, :context, :base_uri, :options
+
+      def_delegators :schema, :validate, :valid?
+
+      def schema
+        @schema ||= begin
+          root_schema = JSONSchemer::Schema.new(context, base_uri:, **options)
+          JSONSchemer::Schema.new(value, nil, root_schema, base_uri:, **options)
+        end
       end
     end
 

lib/openapi_first/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OpenapiFirst
-  VERSION = '2.7.0'
+  VERSION = '2.7.1'
 end

spec/openapi_first_spec.rb

@@ -64,6 +64,16 @@
       expect(returned_definition).to be(original_definition)
     end
 
+    require 'benchmark'
+    it 'works with a large document' do
+      time = Benchmark.realtime do
+        Timeout.timeout(2) do
+          OpenapiFirst.load('./spec/data/large.yaml')
+        end
+      end
+      expect(time).to be < 1
+    end
+
     describe 'only option' do
       specify 'with empty filter' do
         definition = OpenapiFirst.load(spec_path, only: nil)