/
migrator.go
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/
migrator.go
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// Copyright 2023 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package migrator
import (
"context"
"errors"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"github.com/bufbuild/protocompile/ast"
"github.com/bufbuild/protocompile/parser"
"github.com/bufbuild/protocompile/reporter"
"golang.org/x/sync/errgroup"
)
type Migrator struct {
cfg Config
Handler *reporter.Handler
}
func NewMigrator(cfg Config) *Migrator {
handler := reporter.NewHandler(reporter.NewReporter(
func(err reporter.ErrorWithPos) error { return err },
func(err reporter.ErrorWithPos) {
if cfg.Verbose {
log.Println("warning:", err)
}
},
))
return &Migrator{
cfg: cfg,
Handler: handler,
}
}
func (m *Migrator) Migrate(paths ...string) error {
if m.cfg.print && (len(paths) > 1 || filepath.Ext(paths[0]) != ".proto") {
return errors.New("only a single proto file path can be supplied in print mode")
}
grp, _ := errgroup.WithContext(context.Background())
for _, root := range paths {
err := filepath.WalkDir(root, func(srcPath string, stat fs.DirEntry, walkErr error) error {
rootPath := root
if walkErr != nil {
return fmt.Errorf("error walking %s: %w", srcPath, walkErr)
} else if stat.IsDir() || filepath.Ext(srcPath) != ".proto" {
return nil
}
grp.Go(func() error { return m.migrate(rootPath, srcPath, stat) })
return nil
})
if err != nil {
return err
}
}
return grp.Wait()
}
func (m *Migrator) migrate(rootPath, srcPath string, stat fs.DirEntry) error {
switch {
case m.cfg.print:
return m.PrintMigrate(srcPath)
case m.cfg.write:
fileInfo, err := stat.Info()
if err != nil {
return fmt.Errorf("failed to stat %s: %w", srcPath, err)
}
return m.InPlaceMigrate(fileInfo, srcPath)
case m.cfg.output != "":
fileInfo, err := stat.Info()
if err != nil {
return fmt.Errorf("failed to stat %s: %w", srcPath, err)
}
dstPath := filepath.Join(m.cfg.output, strings.TrimPrefix(srcPath, rootPath))
return m.OutputMigrate(fileInfo, srcPath, dstPath)
default:
return errors.New("nothing to migrate")
}
}
func (m *Migrator) PrintMigrate(srcPath string) error {
file, err := os.Open(srcPath)
if err != nil {
return fmt.Errorf("failed to open %s: %w", srcPath, err)
}
defer file.Close()
return m.MigrateFile(srcPath, file, os.Stdout)
}
func (m *Migrator) InPlaceMigrate(src os.FileInfo, srcPath string) error {
srcFile, err := os.Open(srcPath)
if err != nil {
return fmt.Errorf("failed to open source file %s: %w", srcPath, err)
}
defer srcFile.Close()
dstFile, err := os.CreateTemp("", src.Name())
if err != nil {
return fmt.Errorf("failed to create tmp output file: %w", err)
}
defer os.Remove(dstFile.Name())
defer dstFile.Close()
err = dstFile.Chmod(src.Mode())
if err != nil {
return fmt.Errorf("failed to set mode on output file %s: %w", dstFile.Name(), err)
}
err = m.MigrateFile(srcPath, srcFile, dstFile)
if err != nil {
return err
}
srcFile.Close()
dstFile.Close()
err = os.Rename(dstFile.Name(), srcFile.Name())
if err != nil {
return fmt.Errorf("failed to overwrite source file %s: %w", srcPath, err)
}
return nil
}
func (m *Migrator) OutputMigrate(src os.FileInfo, srcPath, dstPath string) error {
srcFile, err := os.Open(srcPath)
if err != nil {
return fmt.Errorf("failed to open source file %s: %w", srcPath, err)
}
defer srcFile.Close()
err = os.MkdirAll(filepath.Dir(dstPath), 0o755)
if err != nil {
return fmt.Errorf("failed to create output directories for %s: %w", dstPath, err)
}
dstFile, err := os.OpenFile(dstPath, os.O_TRUNC|os.O_WRONLY|os.O_CREATE, src.Mode())
if err != nil {
return fmt.Errorf("failed to create destination file %s: %w", dstPath, err)
}
defer dstFile.Close()
return m.MigrateFile(srcPath, srcFile, dstFile)
}
func (m *Migrator) MigrateFile(name string, in io.Reader, out io.Writer) error {
fileNode, err := parser.Parse(name, in, m.Handler)
if err != nil {
return fmt.Errorf("failed to parse %s: %w", name, err)
}
err = ast.Visit(fileNode, New(m.cfg, fileNode, out))
if err != nil {
return fmt.Errorf("failed to rewrite %s: %w", name, err)
}
return nil
}