| // 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 appprotoexec |
| |
| import ( |
| "bytes" |
| "context" |
| "os/exec" |
| "path/filepath" |
| |
| "github.com/bufbuild/buf/internal/pkg/app" |
| "github.com/bufbuild/buf/internal/pkg/app/appproto" |
| "github.com/bufbuild/buf/internal/pkg/protoencoding" |
| "go.opencensus.io/trace" |
| "go.uber.org/zap" |
| "google.golang.org/protobuf/proto" |
| "google.golang.org/protobuf/types/pluginpb" |
| ) |
| |
| var defaultVersion = newVersion( |
| DefaultMajorVersion, |
| DefaultMinorVersion, |
| DefaultPatchVersion, |
| DefaultSuffixVersion, |
| ) |
| |
| type binaryHandler struct { |
| logger *zap.Logger |
| pluginPath string |
| } |
| |
| func newBinaryHandler( |
| logger *zap.Logger, |
| pluginPath string, |
| ) *binaryHandler { |
| return &binaryHandler{ |
| logger: logger.Named("appprotoexec"), |
| pluginPath: pluginPath, |
| } |
| } |
| |
| func (h *binaryHandler) Handle( |
| ctx context.Context, |
| container app.EnvStderrContainer, |
| responseWriter appproto.ResponseWriter, |
| request *pluginpb.CodeGeneratorRequest, |
| ) error { |
| ctx, span := trace.StartSpan(ctx, "plugin_proxy") |
| span.AddAttributes(trace.StringAttribute("plugin", filepath.Base(h.pluginPath))) |
| defer span.End() |
| unsetRequestVersion := false |
| if request.CompilerVersion == nil { |
| unsetRequestVersion = true |
| request.CompilerVersion = defaultVersion |
| } |
| requestData, err := protoencoding.NewWireMarshaler().Marshal(request) |
| if unsetRequestVersion { |
| request.CompilerVersion = nil |
| } |
| if err != nil { |
| return err |
| } |
| responseBuffer := bytes.NewBuffer(nil) |
| cmd := exec.CommandContext(ctx, h.pluginPath) |
| cmd.Env = app.Environ(container) |
| cmd.Stdin = bytes.NewReader(requestData) |
| cmd.Stdout = responseBuffer |
| cmd.Stderr = container.Stderr() |
| if err := cmd.Run(); err != nil { |
| // TODO: strip binary path as well? |
| return err |
| } |
| response := &pluginpb.CodeGeneratorResponse{} |
| if err := protoencoding.NewWireUnmarshaler(nil).Unmarshal(responseBuffer.Bytes(), response); err != nil { |
| return err |
| } |
| response, err = normalizeCodeGeneratorResponse(response) |
| if err != nil { |
| return err |
| } |
| if response.GetSupportedFeatures()&uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL) != 0 { |
| responseWriter.SetFeatureProto3Optional() |
| } |
| for _, file := range response.File { |
| if err := responseWriter.AddFile(file); err != nil { |
| return err |
| } |
| } |
| // plugin.proto specifies that only non-empty errors are considered errors. |
| // This is also consistent with protoc's behaviour. |
| // Ref: https://github.com/protocolbuffers/protobuf/blob/069f989b483e63005f87ab309de130677718bbec/src/google/protobuf/compiler/plugin.proto#L100-L108. |
| if response.GetError() != "" { |
| responseWriter.AddError(response.GetError()) |
| } |
| return nil |
| } |
| |
| func newVersion(major int32, minor int32, patch int32, suffix string) *pluginpb.Version { |
| version := &pluginpb.Version{ |
| Major: proto.Int32(major), |
| Minor: proto.Int32(minor), |
| Patch: proto.Int32(patch), |
| } |
| if suffix != "" { |
| version.Suffix = proto.String(suffix) |
| } |
| return version |
| } |