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gen.go
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gen.go
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package main
import (
"errors"
"fmt"
"go/build"
"go/parser"
"go/token"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strconv"
"strings"
"goa.design/goa/v3/codegen"
"golang.org/x/tools/go/packages"
)
// Generator is the code generation management data structure.
type Generator struct {
// Command is the name of the command to run.
Command string
// DesignPath is the Go import path to the design package.
DesignPath string
// Output is the absolute path to the output directory.
Output string
// DesignVersion is the major component of the Goa version used by the design DSL.
// DesignVersion is either 2 or 3.
DesignVersion int
// bin is the filename of the generated generator.
bin string
// tmpDir is the temporary directory used to compile the generator.
tmpDir string
// hasVendorDirectory is a flag to indicate whether the project uses vendoring
hasVendorDirectory bool
}
// NewGenerator creates a Generator.
func NewGenerator(cmd string, path, output string) *Generator {
bin := "goa"
if runtime.GOOS == "windows" {
bin += ".exe"
}
var version int
var hasVendorDirectory bool
{
version = 2
matched := false
pkgs, _ := packages.Load(&packages.Config{Mode: packages.NeedFiles | packages.NeedModule}, path)
fset := token.NewFileSet()
p := regexp.MustCompile(`goa.design/goa/v(\d+)/dsl`)
for _, pkg := range pkgs {
if _, err := os.Stat(filepath.Join(pkg.Module.Dir, "vendor")); !os.IsNotExist(err) {
hasVendorDirectory = true
}
for _, gof := range pkg.GoFiles {
if bs, err := ioutil.ReadFile(gof); err == nil {
if f, err := parser.ParseFile(fset, "", string(bs), parser.ImportsOnly); err == nil {
for _, s := range f.Imports {
matches := p.FindStringSubmatch(s.Path.Value)
if len(matches) == 2 {
matched = true
version, _ = strconv.Atoi(matches[1]) // We know it's an integer
}
}
}
}
if matched {
break
}
}
if matched {
break
}
}
}
return &Generator{
Command: cmd,
DesignPath: path,
Output: output,
DesignVersion: version,
hasVendorDirectory: hasVendorDirectory,
bin: bin,
}
}
// Write writes the main file.
func (g *Generator) Write(debug bool) error {
var tmpDir string
{
wd := "."
if cwd, err := os.Getwd(); err != nil {
wd = cwd
}
tmp, err := ioutil.TempDir(wd, "goa")
if err != nil {
return err
}
tmpDir = tmp
}
g.tmpDir = tmpDir
var sections []*codegen.SectionTemplate
{
data := map[string]interface{}{
"Command": g.Command,
"CleanupDirs": cleanupDirs(g.Command, g.Output),
"DesignVersion": g.DesignVersion,
}
ver := ""
if g.DesignVersion > 2 {
ver = "v" + strconv.Itoa(g.DesignVersion) + "/"
}
imports := []*codegen.ImportSpec{
codegen.SimpleImport("flag"),
codegen.SimpleImport("fmt"),
codegen.SimpleImport("os"),
codegen.SimpleImport("path/filepath"),
codegen.SimpleImport("sort"),
codegen.SimpleImport("strconv"),
codegen.SimpleImport("strings"),
codegen.SimpleImport("goa.design/goa/" + ver + "codegen"),
codegen.SimpleImport("goa.design/goa/" + ver + "codegen/generator"),
codegen.SimpleImport("goa.design/goa/" + ver + "eval"),
codegen.NewImport("goa", "goa.design/goa/"+ver+"pkg"),
codegen.NewImport("_", g.DesignPath),
}
sections = []*codegen.SectionTemplate{
codegen.Header("Code Generator", "main", imports),
{
Name: "main",
Source: mainT,
Data: data,
},
}
}
f := &codegen.File{Path: "main.go", SectionTemplates: sections}
_, err := f.Render(tmpDir)
return err
}
// Compile compiles the generator.
func (g *Generator) Compile() error {
// We first need to go get the generated package to make sure that all
// dependencies are added to go.sum prior to compiling.
pkgs, err := packages.Load(&packages.Config{Mode: packages.NeedName}, fmt.Sprintf(".%c%s", filepath.Separator, g.tmpDir))
if err != nil {
return err
}
if len(pkgs) != 1 {
return fmt.Errorf("expected to find one package in %s", g.tmpDir)
}
if !g.hasVendorDirectory {
if err := g.runGoCmd("get", pkgs[0].PkgPath); err != nil {
return err
}
}
err = g.runGoCmd("build", "-o", g.bin)
// If we're in vendor context we check the error string to see if it's an issue of unsatisfied dependencies
if err != nil && g.hasVendorDirectory {
if strings.Contains(err.Error(), "cannot find package") && strings.Contains(err.Error(), "/goa.design/goa/v3/codegen/generator") {
return errors.New("generated code expected `goa.design/goa/v3/codegen/generator` to be present in the vendor directory, see documentation for more details")
}
}
return err
}
// Run runs the compiled binary and return the output lines.
func (g *Generator) Run() ([]string, error) {
var cmdl string
{
args := make([]string, len(os.Args)-1)
gopaths := filepath.SplitList(os.Getenv("GOPATH"))
if len(gopaths) == 0 {
gopaths = []string{build.Default.GOPATH}
}
for i, a := range os.Args[1:] {
for _, p := range gopaths {
if strings.HasPrefix(a, p) {
args[i] = strings.Replace(a, p, "$(GOPATH)", 1)
break
}
}
if args[i] == "" {
args[i] = a
}
}
cmdl = " " + strings.Join(args, " ")
rawcmd := filepath.Base(os.Args[0])
// Remove .exe suffix to avoid different output on Windows.
rawcmd = strings.TrimSuffix(rawcmd, ".exe")
cmdl = fmt.Sprintf("$ %s%s", rawcmd, cmdl)
}
args := []string{"--version=" + strconv.Itoa(g.DesignVersion), "--output=" + g.Output, "--cmd=" + cmdl}
cmd := exec.Command(filepath.Join(g.tmpDir, g.bin), args...)
out, err := cmd.CombinedOutput()
if err != nil {
return nil, fmt.Errorf("%s\n%s", err, string(out))
}
res := strings.Split(string(out), "\n")
for (len(res) > 0) && (res[len(res)-1] == "") {
res = res[:len(res)-1]
}
return res, nil
}
// Remove deletes the package files.
func (g *Generator) Remove() {
if g.tmpDir != "" {
os.RemoveAll(g.tmpDir)
g.tmpDir = ""
}
}
func (g *Generator) runGoCmd(args ...string) error {
gobin, err := exec.LookPath("go")
if err != nil {
return fmt.Errorf(`failed to find a go compiler, looked in "%s"`, os.Getenv("PATH"))
}
if g.DesignVersion > 2 {
os.Setenv("GO111MODULE", "on")
}
c := exec.Cmd{
Path: gobin,
Args: append([]string{gobin}, args...),
Dir: g.tmpDir,
}
out, err := c.CombinedOutput()
if err != nil {
if len(out) > 0 {
return fmt.Errorf(string(out))
}
return fmt.Errorf("failed to compile generator: %s", err)
}
return nil
}
// cleanupDirs returns the paths of the subdirectories under gendir to delete
// before generating code.
func cleanupDirs(cmd, output string) []string {
if cmd == "gen" {
gendirPath := filepath.Join(output, codegen.Gendir)
gendir, err := os.Open(gendirPath)
if err != nil {
return nil
}
defer gendir.Close()
finfos, err := gendir.Readdir(-1)
if err != nil {
return []string{gendirPath}
}
dirs := []string{}
for _, fi := range finfos {
if fi.IsDir() {
dirs = append(dirs, filepath.Join(gendirPath, fi.Name()))
}
}
return dirs
}
return nil
}
// mainT is the template for the generator main.
const mainT = `func main() {
var (
out = flag.String("output", "", "")
version = flag.String("version", "", "")
cmdl = flag.String("cmd", "", "")
ver int
)
{
flag.Parse()
if *out == "" {
fail("missing output flag")
}
if *version == "" {
fail("missing version flag")
}
if *cmdl == "" {
fail("missing cmd flag")
}
v, err := strconv.Atoi(*version)
if err != nil {
fail("invalid version %s", *version)
}
ver = v
}
if ver > goa.Major {
fail("cannot run goa %s on design using goa v%s\n", goa.Version(), *version)
}
if err := eval.Context.Errors; err != nil {
fail(err.Error())
}
if err := eval.RunDSL(); err != nil {
fail(err.Error())
}
{{- range .CleanupDirs }}
if err := os.RemoveAll({{ printf "%q" . }}); err != nil {
fail(err.Error())
}
{{- end }}
{{- if gt .DesignVersion 2 }}
codegen.DesignVersion = ver
{{- end }}
outputs, err := generator.Generate(*out, {{ printf "%q" .Command }})
if err != nil {
fail(err.Error())
}
fmt.Println(strings.Join(outputs, "\n"))
}
func fail(msg string, vals ...interface{}) {
fmt.Fprintf(os.Stderr, msg, vals...)
os.Exit(1)
}
`