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| 1 | +// Copyright 2025 The Go MCP SDK Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by an MIT-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +package mcp |
| 6 | + |
| 7 | +import ( |
| 8 | + "context" |
| 9 | + "reflect" |
| 10 | + "testing" |
| 11 | + |
| 12 | + "github.com/google/jsonschema-go/jsonschema" |
| 13 | +) |
| 14 | + |
| 15 | +func TestSchemaCacheByType(t *testing.T) { |
| 16 | + cache := NewSchemaCache() |
| 17 | + |
| 18 | + type TestInput struct { |
| 19 | + Name string `json:"name"` |
| 20 | + } |
| 21 | + |
| 22 | + rt := reflect.TypeFor[TestInput]() |
| 23 | + |
| 24 | + if _, _, ok := cache.getByType(rt); ok { |
| 25 | + t.Error("expected cache miss for new type") |
| 26 | + } |
| 27 | + |
| 28 | + schema := &jsonschema.Schema{Type: "object"} |
| 29 | + resolved, err := schema.Resolve(nil) |
| 30 | + if err != nil { |
| 31 | + t.Fatalf("failed to resolve schema: %v", err) |
| 32 | + } |
| 33 | + cache.setByType(rt, schema, resolved) |
| 34 | + |
| 35 | + gotSchema, gotResolved, ok := cache.getByType(rt) |
| 36 | + if !ok { |
| 37 | + t.Error("expected cache hit after set") |
| 38 | + } |
| 39 | + if gotSchema != schema { |
| 40 | + t.Error("schema mismatch") |
| 41 | + } |
| 42 | + if gotResolved != resolved { |
| 43 | + t.Error("resolved schema mismatch") |
| 44 | + } |
| 45 | +} |
| 46 | + |
| 47 | +func TestSchemaCacheBySchema(t *testing.T) { |
| 48 | + cache := NewSchemaCache() |
| 49 | + |
| 50 | + schema := &jsonschema.Schema{ |
| 51 | + Type: "object", |
| 52 | + Properties: map[string]*jsonschema.Schema{ |
| 53 | + "query": {Type: "string"}, |
| 54 | + }, |
| 55 | + } |
| 56 | + |
| 57 | + if _, ok := cache.getBySchema(schema); ok { |
| 58 | + t.Error("expected cache miss for new schema") |
| 59 | + } |
| 60 | + |
| 61 | + resolved, err := schema.Resolve(nil) |
| 62 | + if err != nil { |
| 63 | + t.Fatalf("failed to resolve schema: %v", err) |
| 64 | + } |
| 65 | + cache.setBySchema(schema, resolved) |
| 66 | + |
| 67 | + gotResolved, ok := cache.getBySchema(schema) |
| 68 | + if !ok { |
| 69 | + t.Error("expected cache hit after set") |
| 70 | + } |
| 71 | + if gotResolved != resolved { |
| 72 | + t.Error("resolved schema mismatch") |
| 73 | + } |
| 74 | + |
| 75 | + // Different pointer should miss (cache uses pointer identity). |
| 76 | + schema2 := &jsonschema.Schema{Type: "object"} |
| 77 | + if _, ok = cache.getBySchema(schema2); ok { |
| 78 | + t.Error("expected cache miss for different schema pointer") |
| 79 | + } |
| 80 | +} |
| 81 | + |
| 82 | +func TestSetSchemaCachesGeneratedSchemas(t *testing.T) { |
| 83 | + cache := NewSchemaCache() |
| 84 | + |
| 85 | + type TestInput struct { |
| 86 | + Query string `json:"query"` |
| 87 | + } |
| 88 | + |
| 89 | + rt := reflect.TypeFor[TestInput]() |
| 90 | + |
| 91 | + var sfield1 any |
| 92 | + var rfield1 *jsonschema.Resolved |
| 93 | + if _, err := setSchema[TestInput](&sfield1, &rfield1, cache); err != nil { |
| 94 | + t.Fatalf("setSchema failed: %v", err) |
| 95 | + } |
| 96 | + |
| 97 | + cachedSchema, cachedResolved, ok := cache.getByType(rt) |
| 98 | + if !ok { |
| 99 | + t.Fatal("schema not cached after first setSchema call") |
| 100 | + } |
| 101 | + |
| 102 | + var sfield2 any |
| 103 | + var rfield2 *jsonschema.Resolved |
| 104 | + if _, err := setSchema[TestInput](&sfield2, &rfield2, cache); err != nil { |
| 105 | + t.Fatalf("setSchema failed on second call: %v", err) |
| 106 | + } |
| 107 | + |
| 108 | + if sfield2.(*jsonschema.Schema) != cachedSchema { |
| 109 | + t.Error("expected cached schema to be returned") |
| 110 | + } |
| 111 | + if rfield2 != cachedResolved { |
| 112 | + t.Error("expected cached resolved schema to be returned") |
| 113 | + } |
| 114 | +} |
| 115 | + |
| 116 | +func TestSetSchemaCachesProvidedSchemas(t *testing.T) { |
| 117 | + cache := NewSchemaCache() |
| 118 | + |
| 119 | + schema := &jsonschema.Schema{ |
| 120 | + Type: "object", |
| 121 | + Properties: map[string]*jsonschema.Schema{ |
| 122 | + "query": {Type: "string"}, |
| 123 | + }, |
| 124 | + } |
| 125 | + |
| 126 | + var sfield1 any = schema |
| 127 | + var rfield1 *jsonschema.Resolved |
| 128 | + if _, err := setSchema[map[string]any](&sfield1, &rfield1, cache); err != nil { |
| 129 | + t.Fatalf("setSchema failed: %v", err) |
| 130 | + } |
| 131 | + |
| 132 | + cachedResolved, ok := cache.getBySchema(schema) |
| 133 | + if !ok { |
| 134 | + t.Fatal("resolved schema not cached after first setSchema call") |
| 135 | + } |
| 136 | + if rfield1 != cachedResolved { |
| 137 | + t.Error("expected same resolved schema") |
| 138 | + } |
| 139 | + |
| 140 | + var sfield2 any = schema |
| 141 | + var rfield2 *jsonschema.Resolved |
| 142 | + if _, err := setSchema[map[string]any](&sfield2, &rfield2, cache); err != nil { |
| 143 | + t.Fatalf("setSchema failed on second call: %v", err) |
| 144 | + } |
| 145 | + |
| 146 | + if rfield2 != cachedResolved { |
| 147 | + t.Error("expected cached resolved schema to be returned") |
| 148 | + } |
| 149 | +} |
| 150 | + |
| 151 | +func TestSetSchemaNilCache(t *testing.T) { |
| 152 | + type TestInput struct { |
| 153 | + Query string `json:"query"` |
| 154 | + } |
| 155 | + |
| 156 | + var sfield1 any |
| 157 | + var rfield1 *jsonschema.Resolved |
| 158 | + if _, err := setSchema[TestInput](&sfield1, &rfield1, nil); err != nil { |
| 159 | + t.Fatalf("setSchema failed: %v", err) |
| 160 | + } |
| 161 | + |
| 162 | + var sfield2 any |
| 163 | + var rfield2 *jsonschema.Resolved |
| 164 | + if _, err := setSchema[TestInput](&sfield2, &rfield2, nil); err != nil { |
| 165 | + t.Fatalf("setSchema failed on second call: %v", err) |
| 166 | + } |
| 167 | + |
| 168 | + if sfield1 == nil || sfield2 == nil { |
| 169 | + t.Error("expected schemas to be generated") |
| 170 | + } |
| 171 | + if rfield1 == nil || rfield2 == nil { |
| 172 | + t.Error("expected resolved schemas to be generated") |
| 173 | + } |
| 174 | +} |
| 175 | + |
| 176 | +func TestAddToolWithSharedCache(t *testing.T) { |
| 177 | + cache := NewSchemaCache() |
| 178 | + |
| 179 | + type GreetInput struct { |
| 180 | + Name string `json:"name" jsonschema:"the name to greet"` |
| 181 | + } |
| 182 | + |
| 183 | + type GreetOutput struct { |
| 184 | + Message string `json:"message"` |
| 185 | + } |
| 186 | + |
| 187 | + handler := func(ctx context.Context, req *CallToolRequest, in GreetInput) (*CallToolResult, GreetOutput, error) { |
| 188 | + return &CallToolResult{}, GreetOutput{Message: "Hello, " + in.Name}, nil |
| 189 | + } |
| 190 | + |
| 191 | + tool := &Tool{ |
| 192 | + Name: "greet", |
| 193 | + Description: "Greet someone", |
| 194 | + } |
| 195 | + |
| 196 | + // Simulate stateless server pattern: new server per request, shared cache. |
| 197 | + for i := 0; i < 3; i++ { |
| 198 | + s := NewServer(&Implementation{Name: "test", Version: "1.0"}, &ServerOptions{ |
| 199 | + SchemaCache: cache, |
| 200 | + }) |
| 201 | + AddTool(s, tool, handler) |
| 202 | + } |
| 203 | + |
| 204 | + rt := reflect.TypeFor[GreetInput]() |
| 205 | + if _, _, ok := cache.getByType(rt); !ok { |
| 206 | + t.Error("expected schema to be cached by type after multiple AddTool calls") |
| 207 | + } |
| 208 | +} |
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