perf(oas2): don't generate bodies when validating

Author: kylef

packages/openapi2-parser/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Master
 
+### Enhancements
+
+- Performance improvements to OpenAPI 2 validation, this will only apply to
+  validation only. Full OpenAPI 2 parsing is not altered.
+
 ### Bug Fixes
 
 - Returns a validation error while trying to parse a YAML or JSON object which

packages/openapi2-parser/lib/adapter.js

@@ -29,9 +29,29 @@ function parse(options) {
   });
 }
 
+function validate(options) {
+  return new Promise((fulfil, reject) => {
+    const parser = new Parser({
+      ...options,
+      generateMessageBody: false,
+      generateMessageBodySchema: false,
+    });
+
+    parser.parse((error, parseResult) => {
+      if (error) {
+        reject(error);
+      } else if (parseResult.annotations.length > 0) {
+        fulfil(new options.namespace.elements.ParseResult(parseResult.annotations));
+      } else {
+        fulfil(null);
+      }
+    });
+  });
+}
+
 /**
  * @implements {FuryAdapter}
  */
 module.exports = {
-  name, mediaTypes, detect, parse,
+  name, mediaTypes, detect, validate, parse,
 };

packages/openapi2-parser/test/adapter-test.js

@@ -104,6 +104,36 @@ describe('Swagger 2.0 adapter', () => {
     });
   });
 
+  context('#validate', () => {
+    it('validates source with no annotations', (done) => {
+      const source = { swagger: '2.0', info: { title: 'Test', version: '1.0' } };
+
+      fury.validate({ source }, (err, parseResult) => {
+        expect(err).to.be.null;
+        expect(parseResult).to.be.null;
+        done();
+      });
+    });
+
+    it('validates source with warnings', (done) => {
+      const source = {
+        swagger: '2.0',
+      };
+
+      fury.validate({ source }, (err, parseResult) => {
+        expect(err).to.be.null;
+        expect(parseResult).to.be.instanceof(fury.minim.elements.ParseResult);
+        expect(parseResult.length).to.equal(3);
+        expect(parseResult.toValue()).to.deep.equal([
+          'Missing required property: title',
+          'Source maps are only available with string input',
+          'Missing required property: version',
+        ]);
+        done();
+      });
+    });
+  });
+
   context('can parse Swagger object', () => {
     const source = { swagger: '2.0', info: { title: 'Test', version: '1.0' } };
     let result;