1// Copyright 2019 The Bazel Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package starlark_test 6 7import ( 8 "bytes" 9 "fmt" 10 "io/ioutil" 11 "os" 12 "os/exec" 13 "strings" 14 "testing" 15 16 "go.starlark.net/starlark" 17) 18 19// TestProfile is a simple integration test that the profiler 20// emits minimally plausible pprof-compatible output. 21func TestProfile(t *testing.T) { 22 prof, err := ioutil.TempFile("", "profile_test") 23 if err != nil { 24 t.Fatal(err) 25 } 26 defer prof.Close() 27 defer os.Remove(prof.Name()) 28 if err := starlark.StartProfile(prof); err != nil { 29 t.Fatal(err) 30 } 31 32 const src = ` 33def fibonacci(n): 34 res = list(range(n)) 35 for i in res[2:]: 36 res[i] = res[i-2] + res[i-1] 37 return res 38 39fibonacci(100000) 40` 41 42 thread := new(starlark.Thread) 43 if _, err := starlark.ExecFile(thread, "foo.star", src, nil); err != nil { 44 _ = starlark.StopProfile() 45 t.Fatal(err) 46 } 47 if err := starlark.StopProfile(); err != nil { 48 t.Fatal(err) 49 } 50 prof.Sync() 51 cmd := exec.Command("go", "tool", "pprof", "-top", prof.Name()) 52 cmd.Stderr = new(bytes.Buffer) 53 cmd.Stdout = new(bytes.Buffer) 54 if err := cmd.Run(); err != nil { 55 t.Fatalf("pprof failed: %v; output=<<%s>>", err, cmd.Stderr) 56 } 57 58 // Typical output (may vary by go release): 59 // 60 // Type: wall 61 // Time: Apr 4, 2019 at 11:10am (EDT) 62 // Duration: 251.62ms, Total samples = 250ms (99.36%) 63 // Showing nodes accounting for 250ms, 100% of 250ms total 64 // flat flat% sum% cum cum% 65 // 320ms 100% 100% 320ms 100% fibonacci 66 // 0 0% 100% 320ms 100% foo.star 67 // 68 // We'll assert a few key substrings are present. 69 got := fmt.Sprint(cmd.Stdout) 70 for _, want := range []string{ 71 "flat%", 72 "fibonacci", 73 "foo.star", 74 } { 75 if !strings.Contains(got, want) { 76 t.Errorf("output did not contain %q", want) 77 } 78 } 79 if t.Failed() { 80 t.Logf("stderr=%v", cmd.Stderr) 81 t.Logf("stdout=%v", cmd.Stdout) 82 } 83} 84