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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"go/ast"
"go/parser"
"go/printer"
"go/token"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
)
func main() {
// Starts finding .proto files
basedir := "./staging"
// Seacrh for prefix
withPrefix := "tech/data/contract"
// new prefix (will be added before withPrefix)
newPrefix := "company/track/datalake_exporter/pkg/proto"
if len(os.Args) >= 2 {
basedir = os.Args[1]
}
CreateProtoFiles(basedir, ".proto")
PatchFiles(withPrefix, newPrefix, basedir, ".go")
}
func NewResultWriter(filename string) *ResultWriter {
return &ResultWriter{
fileName: filename,
}
}
type ResultWriter struct {
fileName string
}
func (w *ResultWriter) Write(p []byte) (n int, err error) {
err = ioutil.WriteFile(w.fileName, p, os.ModeAppend)
if err != nil {
return 0, err
}
return 1, nil
}
// PatchFiles patches files and adds prefix to import paths if they have oldPrefix value at the beginning
func PatchFiles(oldPrefix, newPrefix, baseDir string, ext string) {
err := filepath.Walk("./"+baseDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
if filepath.Ext(info.Name()) == ext {
err := patchImports(oldPrefix, newPrefix, path, baseDir)
if err != nil {
log.Println(err)
}
fmt.Println(path, info.Size())
}
}
return nil
})
if err != nil {
log.Println(fmt.Sprintf("error while patching: %v", err))
}
}
func patchImports(oldPrefix, newPrefix, path string, baseDir string) error {
appDir, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
fileFullPath := filepath.Join(appDir, path)
fileSet := token.NewFileSet()
data, err := ioutil.ReadFile(fileFullPath)
if err != nil {
return err
}
f, err := parser.ParseFile(fileSet, "", string(data), parser.AllErrors)
if err != nil {
return err
}
wasPatched := false
for i := range f.Imports {
if strings.HasPrefix(f.Imports[i].Path.Value, "\""+oldPrefix) {
patchImport(newPrefix, f.Imports[i])
wasPatched = true
}
}
if wasPatched {
err = save(fileFullPath, fileSet, f)
if err != nil {
return fmt.Errorf("can't save file: %v", err)
}
}
return nil
}
func patchImport(newPrefix string, im *ast.ImportSpec) {
old := strings.Trim(im.Path.Value, "\"")
newer := filepath.ToSlash(filepath.Join(newPrefix, old))
im.Path.Value = `"` + newer + `"`
}
func save(fullPath string, fileSet *token.FileSet, f *ast.File) error {
err := os.Rename(fullPath, fullPath+"_old")
if err != nil {
return fmt.Errorf("can't rename old file before saving patched version %v, error: %v", fullPath, err)
}
fileName := strings.TrimSuffix(fullPath, ".go") + "_patched.go"
var buf bytes.Buffer
err = printer.Fprint(&buf, fileSet, f)
if err != nil {
return fmt.Errorf("can't print file into byte buffer: %v", err)
}
_, err = NewResultWriter(fileName).Write(buf.Bytes())
if err != nil {
return fmt.Errorf("can't save result to file : %v", err)
}
return nil
}
// CreateProtoFiles scans folders and subfolders starting from baseDir and generates Golang files form protobuf
func CreateProtoFiles(baseDir string, ext string) {
err := filepath.Walk("./"+baseDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
if filepath.Ext(info.Name()) == ext {
generateProto(path, baseDir)
fmt.Println(path, info.Size())
}
}
return nil
})
if err != nil {
log.Println(fmt.Sprintf("rror during creation of proto files %v", err))
}
}
func generateProto(path string, baseDir string) {
workDir, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
fullPath := filepath.Join(workDir, path)
workDir=filepath.Join(workDir, baseDir)
out, err := exec.Command("protoc", "-I="+workDir, fullPath, "--go_out=plugins=grpc:"+workDir).Output()
fmt.Println(string(out))
if err != nil {
log.Println(err)
}
}