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v1.14.0

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feature_flags_benchmark_test.go

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package github

import (

"context"

"fmt"

"sync/atomic"

"testing"

"github.com/github/github-mcp-server/pkg/inventory"

"github.com/github/github-mcp-server/pkg/translations"

"github.com/modelcontextprotocol/go-sdk/mcp"

)

func BenchmarkFeatureInventory(b *testing.B) {

for _, distribution := range featureBenchmarkDistributions() {

b.Run(distribution.name, func(b *testing.B) {

b.Run("build", func(b *testing.B) {

var calls atomic.Int64

b.ReportAllocs()

for b.Loop() {

_, err := featureBenchmarkBuilder(distribution, &calls).Build()

if err != nil {

b.Fatal(err)

}

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

builder := featureBenchmarkBuilder(distribution, nil)

b.Run("preconstructed-builder", func(b *testing.B) {

b.ReportAllocs()

for b.Loop() {

if _, err := builder.Build(); err != nil {

b.Fatal(err)

}

}

})

b.Run("tools-list", func(b *testing.B) {

inv, calls := featureBenchmarkInventory(b, distribution)

b.ReportAllocs()

b.ResetTimer()

for b.Loop() {

_ = inv.ForMCPRequest(inventory.MCPMethodToolsList, "").ToolsForRegistration(context.Background())

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("read-only-tools-list", func(b *testing.B) {

var calls atomic.Int64

checker := func(_ context.Context, flag string) (bool, error) {

calls.Add(1)

return distribution.enabled["*"] || distribution.enabled[flag], nil

}

tools := AllTools(translations.NullTranslationHelper)

inv, err := inventory.NewBuilder().

SetTools(tools).

SetResources(AllResources(translations.NullTranslationHelper)).

SetPrompts(AllPrompts(translations.NullTranslationHelper)).

WithToolsets([]string{"all"}).

WithReadOnly(true).

WithFeatureChecker(checker).

Build()

if err != nil {

b.Fatal(err)

}

b.ReportAllocs()

b.ResetTimer()

for b.Loop() {

_ = inv.ForMCPRequest(inventory.MCPMethodToolsList, "").ToolsForRegistration(context.Background())

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("unflagged-tool-call", func(b *testing.B) {

inv, calls := featureBenchmarkInventory(b, distribution)

b.ReportAllocs()

b.ResetTimer()

for b.Loop() {

_ = inv.ForMCPRequest(inventory.MCPMethodToolsCall, "get_commit").ToolsForRegistration(context.Background())

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("gated-tool-call", func(b *testing.B) {

inv, calls := featureBenchmarkInventory(b, distribution)

b.ReportAllocs()

b.ResetTimer()

for b.Loop() {

_ = inv.ForMCPRequest(inventory.MCPMethodToolsCall, "get_file_blame").ToolsForRegistration(context.Background())

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("ui-tool-call", func(b *testing.B) {

inv, calls := featureBenchmarkInventory(b, distribution)

b.ReportAllocs()

b.ResetTimer()

for b.Loop() {

_ = inv.ForMCPRequest(inventory.MCPMethodToolsCall, "ui_get").ToolsForRegistration(context.Background())

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("direct-handler-checks", func(b *testing.B) {

var calls atomic.Int64

checker := func(_ context.Context, flag string) (bool, error) {

calls.Add(1)

return distribution.enabled["*"] || distribution.enabled[flag], nil

}

b.ReportAllocs()

for b.Loop() {

ctx := inventory.WithFeatureState(context.Background(), checker)

_ = inventory.ResolveFeature(ctx, checker, inventory.FeatureFlag(FeatureFlagCSVOutput))

_ = inventory.ResolveFeature(ctx, checker, inventory.FeatureFlag(FeatureFlagCSVOutput))

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

b.Run("build-list-register", func(b *testing.B) {

var calls atomic.Int64

b.ReportAllocs()

for b.Loop() {

inv, err := featureBenchmarkBuilder(distribution, &calls).Build()

if err != nil {

b.Fatal(err)

}

inv = inv.ForMCPRequest(inventory.MCPMethodToolsList, "")

server := mcp.NewServer(&mcp.Implementation{Name: "benchmark", Version: "v0"}, nil)

inv.RegisterAll(context.Background(), server, nil)

}

b.ReportMetric(float64(calls.Load())/float64(b.N), "checks/op")

})

})

}

}

type featureBenchmarkDistribution struct {

name string

enabled map[string]bool

}

func featureBenchmarkDistributions() []featureBenchmarkDistribution {

return []featureBenchmarkDistribution{

{name: "all-false"},

{

name: "mixed",

enabled: map[string]bool{

FeatureFlagCSVOutput: true,

FeatureFlagFileBlame: true,

FeatureFlagIssuesGranular: true,

FeatureFlagIssueDependencies: true,

},

},

{name: "all-true", enabled: map[string]bool{"*": true}},

}

}

func featureBenchmarkBuilder(distribution featureBenchmarkDistribution, calls *atomic.Int64) *inventory.Builder {

checker := func(_ context.Context, flag string) (bool, error) {

if calls != nil {

calls.Add(1)

}

return distribution.enabled["*"] || distribution.enabled[flag], nil

}

tools := AllTools(translations.NullTranslationHelper)

for i, baseCount := 0, len(tools); len(tools) < 139; i++ {

tool := tools[i%baseCount]

tool.Tool.Name = fmt.Sprintf("%s_remote_%d", tool.Tool.Name, i)

tools = append(tools, tool)

}

return inventory.NewBuilder().

SetTools(tools).

SetResources(AllResources(translations.NullTranslationHelper)).

SetPrompts(AllPrompts(translations.NullTranslationHelper)).

WithToolsets([]string{"all"}).

WithFeatureChecker(checker)

}

func featureBenchmarkInventory(b *testing.B, distribution featureBenchmarkDistribution) (*inventory.Inventory, *atomic.Int64) {

b.Helper()

var calls atomic.Int64

inv, err := featureBenchmarkBuilder(distribution, &calls).Build()

if err != nil {

b.Fatal(err)

}

return inv, &calls

}