| package telemetry_test |
| |
| import ( |
| "context" |
| "log" |
| "strings" |
| "testing" |
| |
| "golang.org/x/tools/internal/telemetry/event" |
| "golang.org/x/tools/internal/telemetry/export" |
| ) |
| |
| type Hooks struct { |
| A func(ctx context.Context, a *int) (context.Context, func()) |
| B func(ctx context.Context, b *string) (context.Context, func()) |
| } |
| |
| var ( |
| aValue = event.NewInt64Key("a", "") |
| bValue = event.NewStringKey("b", "") |
| aCount = event.NewInt64Key("aCount", "Count of time A is called.") |
| aStat = event.NewInt64Key("aValue", "A value.") |
| bCount = event.NewInt64Key("B", "Count of time B is called.") |
| bLength = event.NewInt64Key("BLen", "B length.") |
| |
| Baseline = Hooks{ |
| A: func(ctx context.Context, a *int) (context.Context, func()) { |
| return ctx, func() {} |
| }, |
| B: func(ctx context.Context, b *string) (context.Context, func()) { |
| return ctx, func() {} |
| }, |
| } |
| |
| StdLog = Hooks{ |
| A: func(ctx context.Context, a *int) (context.Context, func()) { |
| log.Printf("start A where a=%d", *a) |
| return ctx, func() { |
| log.Printf("end A where a=%d", *a) |
| } |
| }, |
| B: func(ctx context.Context, b *string) (context.Context, func()) { |
| log.Printf("start B where b=%q", *b) |
| return ctx, func() { |
| log.Printf("end B where b=%q", *b) |
| } |
| }, |
| } |
| |
| Log = Hooks{ |
| A: func(ctx context.Context, a *int) (context.Context, func()) { |
| event.Print(ctx, "start A", aValue.Of(int64(*a))) |
| return ctx, func() { |
| event.Print(ctx, "end A", aValue.Of(int64(*a))) |
| } |
| }, |
| B: func(ctx context.Context, b *string) (context.Context, func()) { |
| event.Print(ctx, "start B", bValue.Of(*b)) |
| return ctx, func() { |
| event.Print(ctx, "end B", bValue.Of(*b)) |
| } |
| }, |
| } |
| |
| Trace = Hooks{ |
| A: func(ctx context.Context, a *int) (context.Context, func()) { |
| return event.StartSpan(ctx, "A") |
| }, |
| B: func(ctx context.Context, b *string) (context.Context, func()) { |
| return event.StartSpan(ctx, "B") |
| }, |
| } |
| |
| Stats = Hooks{ |
| A: func(ctx context.Context, a *int) (context.Context, func()) { |
| event.Record(ctx, aCount.Of(1)) |
| return ctx, func() { |
| event.Record(ctx, aStat.Of(int64(*a))) |
| } |
| }, |
| B: func(ctx context.Context, b *string) (context.Context, func()) { |
| event.Record(ctx, bCount.Of(1)) |
| return ctx, func() { |
| event.Record(ctx, bLength.Of(int64(len(*b)))) |
| } |
| }, |
| } |
| ) |
| |
| func Benchmark(b *testing.B) { |
| b.Run("Baseline", Baseline.runBenchmark) |
| b.Run("StdLog", StdLog.runBenchmark) |
| event.SetExporter(nil) |
| b.Run("LogNoExporter", Log.runBenchmark) |
| b.Run("TraceNoExporter", Trace.runBenchmark) |
| b.Run("StatsNoExporter", Stats.runBenchmark) |
| |
| event.SetExporter(newExporter()) |
| b.Run("Log", Log.runBenchmark) |
| b.Run("Trace", Trace.runBenchmark) |
| b.Run("Stats", Stats.runBenchmark) |
| } |
| |
| func A(ctx context.Context, hooks Hooks, a int) int { |
| ctx, done := hooks.A(ctx, &a) |
| defer done() |
| if a > 0 { |
| a = a * 10 |
| } |
| return B(ctx, hooks, a, "Called from A") |
| } |
| |
| func B(ctx context.Context, hooks Hooks, a int, b string) int { |
| _, done := hooks.B(ctx, &b) |
| defer done() |
| b = strings.ToUpper(b) |
| if len(b) > 1024 { |
| b = strings.ToLower(b) |
| } |
| return a + len(b) |
| } |
| |
| func (hooks Hooks) runBenchmark(b *testing.B) { |
| ctx := context.Background() |
| b.ReportAllocs() |
| b.ResetTimer() |
| var acc int |
| for i := 0; i < b.N; i++ { |
| for _, value := range []int{0, 10, 20, 100, 1000} { |
| acc += A(ctx, hooks, value) |
| } |
| } |
| } |
| |
| func init() { |
| log.SetOutput(new(noopWriter)) |
| } |
| |
| type noopWriter int |
| |
| func (nw *noopWriter) Write(b []byte) (int, error) { |
| return len(b), nil |
| } |
| |
| type loggingExporter struct { |
| logger event.Exporter |
| } |
| |
| func newExporter() *loggingExporter { |
| return &loggingExporter{ |
| logger: export.LogWriter(new(noopWriter), false), |
| } |
| } |
| |
| func (e *loggingExporter) ProcessEvent(ctx context.Context, ev event.Event) (context.Context, event.Event) { |
| ctx, ev = export.ContextSpan(ctx, ev) |
| return e.logger.ProcessEvent(ctx, ev) |
| } |