Containerize inspects startFn and builds Go shim with local process endpoint that imports given `startFn` function. Binary is then put in adhoc container and returned as runnable ready to be started.
(e Environment, name string, startFn func(context.Context) error)
| 18 | // Containerize inspects startFn and builds Go shim with local process endpoint that imports given `startFn` function. |
| 19 | // Binary is then put in adhoc container and returned as runnable ready to be started. |
| 20 | func Containerize(e Environment, name string, startFn func(context.Context) error) (Runnable, error) { |
| 21 | de, ok := e.(*DockerEnvironment) |
| 22 | if !ok { |
| 23 | return nil, errors.New("not implemented") |
| 24 | } |
| 25 | |
| 26 | // Not portable, but good enough for local unit tests. |
| 27 | wd, err := os.Getwd() |
| 28 | if err != nil { |
| 29 | return nil, err |
| 30 | } |
| 31 | |
| 32 | strs := strings.Split(runtime.FuncForPC(reflect.ValueOf(startFn).Pointer()).Name(), ".") |
| 33 | funcName := strs[len(strs)-1] |
| 34 | pkg := strings.Join(strs[:len(strs)-1], ".") |
| 35 | |
| 36 | modulePath := pkg |
| 37 | absModulePath := wd |
| 38 | for len(absModulePath) > 0 { |
| 39 | _, err := os.Stat(filepath.Join(absModulePath, "go.mod")) |
| 40 | if os.IsNotExist(err) { |
| 41 | absModulePath = filepath.Dir(absModulePath) |
| 42 | modulePath = filepath.Dir(modulePath) |
| 43 | continue |
| 44 | } |
| 45 | if err == nil { |
| 46 | break |
| 47 | } |
| 48 | return nil, err |
| 49 | } |
| 50 | |
| 51 | if len(absModulePath) == 0 { |
| 52 | return nil, errors.Newf("not a Go module %v", wd) |
| 53 | } |
| 54 | |
| 55 | f := e.Runnable(name).WithPorts(map[string]int{"http": 80}).Future() |
| 56 | dir := filepath.Join(f.Dir(), "shim") |
| 57 | |
| 58 | if err := os.MkdirAll(dir, os.ModePerm); err != nil { |
| 59 | return nil, err |
| 60 | } |
| 61 | |
| 62 | // TODO(saswatamcode): Maybe we can do away with goModTmpl, and just run go mod init shim, go mod edit -replace %v=%v and go mod tidy here. |
| 63 | if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte(fmt.Sprintf(goModTmpl, modulePath, modulePath, absModulePath)), os.ModePerm); err != nil { |
| 64 | return nil, err |
| 65 | } |
| 66 | if err := os.WriteFile(filepath.Join(dir, "main.go"), []byte(fmt.Sprintf(mainFileTmpl, pkg, funcName)), os.ModePerm); err != nil { |
| 67 | return nil, err |
| 68 | } |
| 69 | if err := os.WriteFile(filepath.Join(dir, "Dockerfile"), []byte(dockerFile), os.ModePerm); err != nil { |
| 70 | return nil, err |
| 71 | } |
| 72 | |
| 73 | cmd := de.exec("go", "mod", "tidy") |
| 74 | cmd.Dir = dir |
| 75 | if out, err := cmd.CombinedOutput(); err != nil { |
| 76 | return nil, errors.Wrap(err, string(out)) |
| 77 | } |