/
generator.go
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/
generator.go
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// Copyright 2019 Google LLC
//
// 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.
// +build !windows
// Package generator provides tools for generating clients.
package generator
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"cloud.google.com/go/internal/gapicgen/git"
)
// Config contains inputs needed to generate sources.
type Config struct {
GoogleapisDir string
GenprotoDir string
GapicDir string
ProtoDir string
GapicToGenerate string
OnlyGenerateGapic bool
LocalMode bool
RegenOnly bool
ForceAll bool
}
// Generate generates genproto and gapics.
func Generate(ctx context.Context, conf *Config) ([]*git.ChangeInfo, error) {
if !conf.OnlyGenerateGapic {
protoGenerator := NewGenprotoGenerator(conf)
if err := protoGenerator.Regen(ctx); err != nil {
return nil, fmt.Errorf("error generating genproto (may need to check logs for more errors): %v", err)
}
}
var changes []*git.ChangeInfo
if !conf.LocalMode {
var err error
changes, err = gatherChanges(conf.GoogleapisDir, conf.GenprotoDir)
if err != nil {
return nil, fmt.Errorf("error gathering commit info")
}
if err := recordGoogleapisHash(conf.GoogleapisDir, conf.GenprotoDir); err != nil {
return nil, err
}
}
var modifiedPkgs []string
for _, v := range changes {
if v.Package != "" {
modifiedPkgs = append(modifiedPkgs, v.PackageDir)
}
}
gapicGenerator := NewGapicGenerator(conf, modifiedPkgs)
if err := gapicGenerator.Regen(ctx); err != nil {
return nil, fmt.Errorf("error generating gapics (may need to check logs for more errors): %v", err)
}
return changes, nil
}
func gatherChanges(googleapisDir, genprotoDir string) ([]*git.ChangeInfo, error) {
// Get the last processed googleapis hash.
lastHash, err := ioutil.ReadFile(filepath.Join(genprotoDir, "regen.txt"))
if err != nil {
return nil, err
}
commits, err := git.CommitsSinceHash(googleapisDir, string(lastHash), false)
if err != nil {
return nil, err
}
gapicPkgs := make(map[string]string)
for _, v := range microgenGapicConfigs {
gapicPkgs[v.inputDirectoryPath] = v.importPath
}
changes, err := git.ParseChangeInfo(googleapisDir, commits, gapicPkgs)
if err != nil {
return nil, err
}
return changes, nil
}
// recordGoogleapisHash parses the latest commit in googleapis and records it to
// regen.txt in go-genproto.
func recordGoogleapisHash(googleapisDir, genprotoDir string) error {
commits, err := git.CommitsSinceHash(googleapisDir, "HEAD", true)
if err != nil {
return err
}
if len(commits) != 1 {
return fmt.Errorf("only expected one commit, got %d", len(commits))
}
f, err := os.OpenFile(filepath.Join(genprotoDir, "regen.txt"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer f.Close()
if _, err := f.WriteString(commits[0]); err != nil {
return err
}
return nil
}