217 lines
7.1 KiB
Go
217 lines
7.1 KiB
Go
// Copyright 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rust
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import (
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"fmt"
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"strings"
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"android/soong/android"
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)
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var (
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defaultProtobufFlags = []string{""}
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)
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const (
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grpcSuffix = "_grpc"
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)
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type PluginType int
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const (
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Protobuf PluginType = iota
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Grpc
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)
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func init() {
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android.RegisterModuleType("rust_protobuf", RustProtobufFactory)
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android.RegisterModuleType("rust_protobuf_host", RustProtobufHostFactory)
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android.RegisterModuleType("rust_grpcio", RustGrpcioFactory)
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android.RegisterModuleType("rust_grpcio_host", RustGrpcioHostFactory)
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}
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var _ SourceProvider = (*protobufDecorator)(nil)
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type ProtobufProperties struct {
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// Path to the proto file that will be used to generate the source
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Proto *string `android:"path,arch_variant"`
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// List of additional flags to pass to aprotoc
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Proto_flags []string `android:"arch_variant"`
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// List of libraries which export include paths required for this module
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Header_libs []string `android:"arch_variant"`
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}
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type protobufDecorator struct {
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*BaseSourceProvider
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Properties ProtobufProperties
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plugin PluginType
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}
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func (proto *protobufDecorator) GenerateSource(ctx ModuleContext, deps PathDeps) android.Path {
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var protoFlags android.ProtoFlags
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var pluginPaths android.Paths
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protoFlags.OutTypeFlag = "--rust_out"
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outDir := android.PathForModuleOut(ctx)
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pluginPaths, protoFlags = proto.setupPlugin(ctx, protoFlags, outDir)
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protoFlags.Flags = append(protoFlags.Flags, defaultProtobufFlags...)
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protoFlags.Flags = append(protoFlags.Flags, proto.Properties.Proto_flags...)
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protoFlags.Deps = append(protoFlags.Deps, pluginPaths...)
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protoFile := android.OptionalPathForModuleSrc(ctx, proto.Properties.Proto)
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if !protoFile.Valid() {
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ctx.PropertyErrorf("proto", "invalid path to proto file")
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}
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// Add exported dependency include paths
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for _, include := range deps.depIncludePaths {
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protoFlags.Flags = append(protoFlags.Flags, "-I"+include.String())
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}
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stem := proto.BaseSourceProvider.getStem(ctx)
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// rust protobuf-codegen output <stem>.rs
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stemFile := android.PathForModuleOut(ctx, stem+".rs")
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// add mod_<stem>.rs to import <stem>.rs
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modFile := android.PathForModuleOut(ctx, "mod_"+stem+".rs")
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// mod_<stem>.rs is the main/first output file to be included/compiled
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outputs := android.WritablePaths{modFile, stemFile}
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if proto.plugin == Grpc {
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outputs = append(outputs, android.PathForModuleOut(ctx, stem+grpcSuffix+".rs"))
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}
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depFile := android.PathForModuleOut(ctx, "mod_"+stem+".d")
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rule := android.NewRuleBuilder()
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android.ProtoRule(ctx, rule, protoFile.Path(), protoFlags, protoFlags.Deps, outDir, depFile, outputs)
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rule.Command().Text("printf '" + proto.getModFileContents(ctx) + "' >").Output(modFile)
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rule.Build(pctx, ctx, "protoc_"+protoFile.Path().Rel(), "protoc "+protoFile.Path().Rel())
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proto.BaseSourceProvider.OutputFiles = android.Paths{modFile, stemFile}
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return modFile
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}
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func (proto *protobufDecorator) getModFileContents(ctx ModuleContext) string {
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stem := proto.BaseSourceProvider.getStem(ctx)
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lines := []string{
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"// @generated",
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fmt.Sprintf("pub mod %s;", stem),
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}
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if proto.plugin == Grpc {
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lines = append(lines, fmt.Sprintf("pub mod %s%s;", stem, grpcSuffix))
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lines = append(
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lines,
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"pub mod empty {",
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" pub use protobuf::well_known_types::Empty;",
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"}")
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}
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return strings.Join(lines, "\\n")
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}
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func (proto *protobufDecorator) setupPlugin(ctx ModuleContext, protoFlags android.ProtoFlags, outDir android.ModuleOutPath) (android.Paths, android.ProtoFlags) {
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pluginPaths := []android.Path{}
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if proto.plugin == Protobuf {
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pluginPath := ctx.Config().HostToolPath(ctx, "protoc-gen-rust")
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pluginPaths = append(pluginPaths, pluginPath)
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protoFlags.Flags = append(protoFlags.Flags, "--plugin="+pluginPath.String())
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} else if proto.plugin == Grpc {
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grpcPath := ctx.Config().HostToolPath(ctx, "grpc_rust_plugin")
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protobufPath := ctx.Config().HostToolPath(ctx, "protoc-gen-rust")
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pluginPaths = append(pluginPaths, grpcPath, protobufPath)
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protoFlags.Flags = append(protoFlags.Flags, "--grpc_out="+outDir.String())
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protoFlags.Flags = append(protoFlags.Flags, "--plugin=protoc-gen-grpc="+grpcPath.String())
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protoFlags.Flags = append(protoFlags.Flags, "--plugin=protoc-gen-rust="+protobufPath.String())
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} else {
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ctx.ModuleErrorf("Unknown protobuf plugin type requested")
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}
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return pluginPaths, protoFlags
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}
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func (proto *protobufDecorator) SourceProviderProps() []interface{} {
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return append(proto.BaseSourceProvider.SourceProviderProps(), &proto.Properties)
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}
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func (proto *protobufDecorator) SourceProviderDeps(ctx DepsContext, deps Deps) Deps {
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deps = proto.BaseSourceProvider.SourceProviderDeps(ctx, deps)
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deps.Rustlibs = append(deps.Rustlibs, "libprotobuf")
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deps.HeaderLibs = append(deps.SharedLibs, proto.Properties.Header_libs...)
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if proto.plugin == Grpc {
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deps.Rustlibs = append(deps.Rustlibs, "libgrpcio", "libfutures")
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deps.HeaderLibs = append(deps.HeaderLibs, "libprotobuf-cpp-full")
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}
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return deps
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}
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// rust_protobuf generates protobuf rust code from the provided proto file. This uses the protoc-gen-rust plugin for
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// protoc. Additional flags to the protoc command can be passed via the proto_flags property. This module type will
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// create library variants that can be used as a crate dependency by adding it to the rlibs, dylibs, and rustlibs
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// properties of other modules.
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func RustProtobufFactory() android.Module {
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module, _ := NewRustProtobuf(android.HostAndDeviceSupported)
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return module.Init()
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}
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// A host-only variant of rust_protobuf. Refer to rust_protobuf for more details.
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func RustProtobufHostFactory() android.Module {
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module, _ := NewRustProtobuf(android.HostSupported)
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return module.Init()
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}
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func RustGrpcioFactory() android.Module {
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module, _ := NewRustGrpcio(android.HostAndDeviceSupported)
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return module.Init()
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}
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// A host-only variant of rust_protobuf. Refer to rust_protobuf for more details.
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func RustGrpcioHostFactory() android.Module {
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module, _ := NewRustGrpcio(android.HostSupported)
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return module.Init()
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}
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func NewRustProtobuf(hod android.HostOrDeviceSupported) (*Module, *protobufDecorator) {
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protobuf := &protobufDecorator{
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BaseSourceProvider: NewSourceProvider(),
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Properties: ProtobufProperties{},
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plugin: Protobuf,
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}
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module := NewSourceProviderModule(hod, protobuf, false)
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return module, protobuf
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}
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func NewRustGrpcio(hod android.HostOrDeviceSupported) (*Module, *protobufDecorator) {
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protobuf := &protobufDecorator{
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BaseSourceProvider: NewSourceProvider(),
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Properties: ProtobufProperties{},
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plugin: Grpc,
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}
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module := NewSourceProviderModule(hod, protobuf, false)
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return module, protobuf
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}
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