The Go Playgoroundで 外部パッケージ使いたい

Go(Un)Conference（Goあんこ）LT大会 4kg https://gounconference.connpass.com/event/99487/ の発表資料です。

Transcript

1. ©2018 Wantedly, Inc.
   The Go PlaygoroundͰ
   ֎෦ύοέʔδ࢖͍͍ͨ
   Go(Un)Conference 4kg
   19.Oct.2018 - Hazumi Ichijo
   

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2. ©2018 Wantedly, Inc.
   ࣗݾ঺հ
   Ұᑍ୺੅!IB[VNJSS!SFSPTU
   8FC"QQMJDBUJPO&OHJOFFS
   (P 3BJMT 3FBDUʜ
   ۴࿏ߴઐஜ೾େֶ8BOUFEMZ
   

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3. ©2018 Wantedly, Inc.
   1MBZHSPVOE
   JSC
   SBJMTDPOTPMF
   ࢼ͠ʹίʔυΛಈ͔͍ͨ͠ͱ͖
   

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4. ©2018 Wantedly, Inc.
   1MBZHSPVOE
   JSC
   SBJMTDPOTPMF
   ࢼ͠ʹίʔυΛಈ͔͍ͨ͠ͱ͖
   ֎෦ύοέʔδ࢖͑ͳ͍ɾɾɾ
   

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5. ©2018 Wantedly, Inc.
   package main
   import (
   "fmt"
   "gopkg.in/guregu/null.v3"
   )
   func main() {
   fmt.Println(null.StringFrom("PlayGround"))
   }
   

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6. ©2018 Wantedly, Inc.
   HPHFUΛ࣮ߦ͢Δ͚ͩͰ
   ύοέʔδͷґଘղܾͯ͘͠Εͨ͸ͣɾɾɾʁ
   

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7. ©2018 Wantedly, Inc.
   func compileAndRun(req *request) (*response, error) {
   // TODO(andybons): Add semaphore to limit number of running programs at once.
   tmpDir, err := ioutil.TempDir("", "sandbox")
   if err != nil {
   return nil, fmt.Errorf("error creating temp directory: %v", err)
   }
   defer os.RemoveAll(tmpDir)
   src := []byte(req.Body)
   in := filepath.Join(tmpDir, "main.go")
   if err := ioutil.WriteFile(in, src, 0400); err != nil {
   return nil, fmt.Errorf("error creating temp file %q: %v", in, err)
   }
   https://github.com/golang/playground/blob/master/sandbox.go
   

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8. ©2018 Wantedly, Inc.
   func compileAndRun(req *request) (*response, error) {
   // TODO(andybons): Add semaphore to limit number of running programs at once.
   tmpDir, err := ioutil.TempDir("", "sandbox")
   if err != nil {
   return nil, fmt.Errorf("error creating temp directory: %v", err)
   }
   defer os.RemoveAll(tmpDir)
   src := []byte(req.Body)
   in := filepath.Join(tmpDir, "main.go")
   if err := ioutil.WriteFile(in, src, 0400); err != nil {
   return nil, fmt.Errorf("error creating temp file %q: %v", in, err)
   }
   https://github.com/golang/playground/blob/master/sandbox.go
   

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9. ©2018 Wantedly, Inc.
   ݁ہϑΝΠϧʹॻ͖ग़ͯ͠Ϗϧυ͍ͯ͠Δ͚ͩͳͷͰ
   ॻ͖ग़͠ઌΛ(01"5)ҎԼʹ͢Δ
   HPHFUΛ࣮ߦ͢Δ
   ͜Ε͚ͩͰ͍͚Δʁʢ͍͚ΔΘ͚͕ͳͦ͞͏ʣ
   

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10. ©2018 Wantedly, Inc.
    https://github.com/rerost/playground/compare/e07747d8d2cee6639b14ba8021d453a6b8dd9edc...master
    

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11. ©2018 Wantedly, Inc.
    

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12. ©2018 Wantedly, Inc.
    ಈ͍ͯ͠·ͬͨɾɾɾ
    

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13. ©2018 Wantedly, Inc.
    https://play-dot-k8s-test-219404.appspot.com/
    @hazumirr
    

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14. ©2018 Wantedly, Inc.
    ͳͥ͜ͷํ๏Ͱ্ख͍͔ͬͨ͘
    

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15. ©2018 Wantedly, Inc.
    ͳͥ͏·͘ߦͬͨͷ͔
    4BOECPY͕ίʔυͷ࣮ߦ࣌ͷΈ༗ޮʹͳ͍ͬͯͨ
    ػೳ͕γϯϓϧͩͬͨ
    

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16. ©2018 Wantedly, Inc.
    cmd.Env = []string{"GOOS=nacl", "GOARCH=amd64p32", "GOPATH=" + os.Getenv("GOPATH")}
    if out, err := cmd.CombinedOutput(); err != nil {
    if _, ok := err.(*exec.ExitError); ok {
    // Return compile errors to the user.
    // Rewrite compiler errors to refer to progName
    // instead of '/tmp/sandbox1234/main.go'.
    errs := strings.Replace(string(out), in, progName, -1)
    // "go build", invoked with a file name, puts this odd
    // message before any compile errors; strip it.
    errs = strings.Replace(errs, "# command-line-arguments\n", "", 1)
    return &response{Errors: errs}, nil
    }
    return nil, fmt.Errorf("error building go source: %v", err)
    }
    ctx, cancel := context.WithTimeout(context.Background(), maxRunTime)
    defer cancel()
    cmd = exec.CommandContext(ctx, "sel_ldr_x86_64", "-l", "/dev/null", "-S", "-e", exe, testParam)
    https://github.com/golang/playground/blob/master/sandbox.go#L320-L339
    

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17. ©2018 Wantedly, Inc.
    cmd.Env = []string{"GOOS=nacl", "GOARCH=amd64p32", "GOPATH=" + os.Getenv("GOPATH")}
    if out, err := cmd.CombinedOutput(); err != nil {
    if _, ok := err.(*exec.ExitError); ok {
    // Return compile errors to the user.
    // Rewrite compiler errors to refer to progName
    // instead of '/tmp/sandbox1234/main.go'.
    errs := strings.Replace(string(out), in, progName, -1)
    // "go build", invoked with a file name, puts this odd
    // message before any compile errors; strip it.
    errs = strings.Replace(errs, "# command-line-arguments\n", "", 1)
    return &response{Errors: errs}, nil
    }
    return nil, fmt.Errorf("error building go source: %v", err)
    }
    ctx, cancel := context.WithTimeout(context.Background(), maxRunTime)
    defer cancel()
    cmd = exec.CommandContext(ctx, "sel_ldr_x86_64", "-l", "/dev/null", "-S", "-e", exe, testParam)
    https://github.com/golang/playground/blob/master/sandbox.go#L320-L339
    

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18. ©2018 Wantedly, Inc.
    NaClͱ͸
    αϯυϘοΫεΛ࣮ݱ͢ΔͨΊͷ΋ͷɹ
    $ISPNFͷ΢ΣϒετΞͰ഑෍͞ΕΔ

    ΞϓϦέʔγϣϯΛ࣮ߦ͢Δͷʹ࢖ΘΕΔ΋ͷ
    /B$M༻ʹϏϧυ͞ΕͨόΠφϦ͕ඞཁ<ཁग़య>
    https://ja.wikipedia.org/wiki/Google_Native_Client
    

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19. ©2018 Wantedly, Inc.
    ͳͥ͏·͍ͬͨ͘ͷ͔
    /B$M
    ίʔυͷ࣮ߦͷࡍͷΈ༗ޮͩͬͨ
    /B$MͰ4BOECPY͕࣮ݱ͞Ε͍ͯͨ
    (P͕/B$M༻ͷόΠφϦΛ࡞ΕΔʢ(004OBDMʣɹ
    

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20. ©2018 Wantedly, Inc.
    ͳͥ͏·͍ͬͨ͘ͷ͔
    

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21. ©2018 Wantedly, Inc.
    https://play-dot-k8s-test-219404.appspot.com/
    ੬ऑੑ΍ෆ۩߹ͳͲΛݟ͚ͭͨΒڭ͍͑ͯͩ͘͞
    

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