[OpenAPI] Add OpenAPI adapter

[tobias-tengler]

No description provided.

[github-actions]

🚀 Fusion Gateway Performance Results

Simple Composite Query

Requests/sec	Error Rate
4669.73 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95	P99
1.06ms	9.42ms	161.73ms	10.55ms	14.44ms	20.86ms	0.00ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
      }
    }
  }
}

Variable Batching Throughput

Requests/sec	Error Rate
21585.94 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95	P99
0.10ms	1.85ms	49.07ms	2.27ms	3.88ms	5.54ms	0.00ms

Executed Query

query TestQuery_8f7a46ce_2(
  $__fusion_1_upc: ID!
  $__fusion_2_price: Long!
  $__fusion_2_weight: Long!
) {
  productByUpc(upc: $__fusion_1_upc) {
    inStock
    shippingEstimate(weight: $__fusion_2_weight, price: $__fusion_2_price)
  }
}

Variables (5 sets batched in single request)

[
  { "__fusion_1_upc": "1", "__fusion_2_price": 899, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "2", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 },
  { "__fusion_1_upc": "3", "__fusion_2_price": 15, "__fusion_2_weight": 20 },
  { "__fusion_1_upc": "4", "__fusion_2_price": 499, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "5", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 }
]

No baseline data available for comparison.

---

Run 19289634204 • Commit 5a1b607 • Wed, 12 Nov 2025 07:31:10 GMT

[Copilot]

Pull Request Overview

This PR adds an OpenAPI adapter to HotChocolate, enabling GraphQL schemas to be exposed as OpenAPI/REST endpoints. The adapter supports mapping GraphQL operations to HTTP endpoints with validation, hot-reloading, and both standalone and Fusion gateway scenarios.

Key changes:

• New OpenAPI adapter implementation with document parsing, validation, and transformation
• Support for fragment documents and operation documents with GraphQL-to-OpenAPI mapping
• Comprehensive validation rules for operations, routes, parameters, and directives
• Test infrastructure with Xunit2/Xunit3 support and extensive integration/validation tests

Reviewed Changes

Copilot reviewed 143 out of 143 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
OneOfMutableDirectiveDefinition.cs	Added description for @OneOf directive
FusionScalarTypeDefinition.cs	Added SerializationType mapping for built-in scalar types
GraphQLQueryBenchmark.cs	Updated namespace from Exporters.Csv to Adapters.Csv
Xunit3.Directory.Build.props	New test configuration for Xunit3 projects
Xunit2.Directory.Build.props	New test configuration for Xunit2 projects
ValidationTests.cs	Test class for standalone validation scenarios
ValidationTestBase.cs	Base class with 872 lines of validation tests
FusionValidationTests.cs	Test class for Fusion gateway validation
TestServerSession.cs	Test infrastructure for managing test servers
TestHelpers.cs	Helper methods and test schema setup
OpenApiTestBase.cs	Base test class with storage and JWT helpers
Multiple snapshot files	Expected OpenAPI JSON outputs for various scenarios
OpenApi adapter core files	Implementation of parsing, validation, storage, execution

---

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[github-actions]

🚀 Fusion Gateway Performance Results

Simple Composite Query

Requests/sec	Error Rate
4600.10 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95	P99
0.93ms	9.53ms	161.70ms	10.71ms	14.31ms	20.49ms	0.00ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
      }
    }
  }
}

Variable Batching Throughput

Requests/sec	Error Rate
21670.20 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95	P99
0.10ms	1.85ms	51.60ms	2.26ms	3.83ms	5.52ms	0.00ms

Executed Query

query TestQuery_8f7a46ce_2(
  $__fusion_1_upc: ID!
  $__fusion_2_price: Long!
  $__fusion_2_weight: Long!
) {
  productByUpc(upc: $__fusion_1_upc) {
    inStock
    shippingEstimate(weight: $__fusion_2_weight, price: $__fusion_2_price)
  }
}

Variables (5 sets batched in single request)

[
  { "__fusion_1_upc": "1", "__fusion_2_price": 899, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "2", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 },
  { "__fusion_1_upc": "3", "__fusion_2_price": 15, "__fusion_2_weight": 20 },
  { "__fusion_1_upc": "4", "__fusion_2_price": 499, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "5", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 }
]

No baseline data available for comparison.

---

Run 19289961012 • Commit f4de428 • Wed, 12 Nov 2025 07:46:29 GMT

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (d96e96e) to head (6116497).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #8886   +/-   ##
============================
============================

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