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generator.go
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/
generator.go
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// Copyright 2020-2021 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 appproto
import (
"context"
"errors"
"github.com/bufbuild/buf/private/pkg/app"
"github.com/bufbuild/buf/private/pkg/protodescriptor"
"github.com/bufbuild/buf/private/pkg/storage"
"github.com/bufbuild/buf/private/pkg/thread"
"go.uber.org/multierr"
"go.uber.org/zap"
"google.golang.org/protobuf/types/pluginpb"
)
type generator struct {
logger *zap.Logger
handler Handler
}
func newGenerator(
logger *zap.Logger,
handler Handler,
) *generator {
return &generator{
logger: logger,
handler: handler,
}
}
func (g *generator) Generate(
ctx context.Context,
container app.EnvStderrContainer,
writeBucket storage.WriteBucket,
requests []*pluginpb.CodeGeneratorRequest,
options ...GenerateOption,
) error {
generateOptions := newGenerateOptions()
for _, option := range options {
option(generateOptions)
}
files, err := g.getResponseFiles(ctx, container, requests)
if err != nil {
return err
}
for _, file := range files {
if file.GetInsertionPoint() != "" {
if generateOptions.insertionPointReadBucket == nil {
return storage.NewErrNotExist(file.GetName())
}
if err := applyInsertionPoint(ctx, file, generateOptions.insertionPointReadBucket, writeBucket); err != nil {
return err
}
} else if err := storage.PutPath(ctx, writeBucket, file.GetName(), []byte(file.GetContent())); err != nil {
return err
}
}
return nil
}
func (g *generator) getResponseFiles(
ctx context.Context,
container app.EnvStderrContainer,
requests []*pluginpb.CodeGeneratorRequest,
) ([]*pluginpb.CodeGeneratorResponse_File, error) {
responseWriter := newResponseWriter(container)
jobs := make([]func(context.Context) error, len(requests))
for i, request := range requests {
request := request
jobs[i] = func(ctx context.Context) error {
if err := protodescriptor.ValidateCodeGeneratorRequest(request); err != nil {
return err
}
return g.handler.Handle(ctx, container, responseWriter, request)
}
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
if err := thread.Parallelize(ctx, jobs, thread.ParallelizeWithCancel(cancel)); err != nil {
return nil, err
}
response := responseWriter.ToResponse()
if err := protodescriptor.ValidateCodeGeneratorResponse(response); err != nil {
return nil, err
}
if errString := response.GetError(); errString != "" {
return nil, errors.New(errString)
}
return response.File, nil
}
// applyInsertionPoint inserts the content of the given file at the insertion point that it specfiies.
// For more details on insertion points, see the following:
//
// https://github.com/protocolbuffers/protobuf/blob/f5bdd7cd56aa86612e166706ed8ef139db06edf2/src/google/protobuf/compiler/plugin.proto#L135-L171
func applyInsertionPoint(
ctx context.Context,
file *pluginpb.CodeGeneratorResponse_File,
readBucket storage.ReadBucket,
writeBucket storage.WriteBucket,
) (retErr error) {
targetReadObjectCloser, err := readBucket.Get(ctx, file.GetName())
if err != nil {
return err
}
defer func() {
retErr = multierr.Append(retErr, targetReadObjectCloser.Close())
}()
resultData, err := ApplyInsertionPoint(ctx, file, targetReadObjectCloser)
if err != nil {
return err
}
// This relies on storageos buckets maintaining existing file permissions
return storage.PutPath(ctx, writeBucket, file.GetName(), resultData)
}
type generateOptions struct {
insertionPointReadBucket storage.ReadBucket
}
func newGenerateOptions() *generateOptions {
return &generateOptions{}
}