alandonovan | 61fc542 | 2019-04-05 16:12:13 -0400 | [diff] [blame] | 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 | |
| 5 | package starlark_test |
| 6 | |
| 7 | import ( |
| 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. |
| 21 | func 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 = ` |
| 33 | def 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 | |
| 39 | fibonacci(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 | } |