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// Copyright 2020 The Android Open Source Project
//
// 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 rust
import (
"android/soong/android"
)
var (
defaultProtobufFlags = []string{""}
)
func init() {
android.RegisterModuleType("rust_protobuf", RustProtobufFactory)
android.RegisterModuleType("rust_protobuf_host", RustProtobufHostFactory)
}
var _ SourceProvider = (*protobufDecorator)(nil)
type ProtobufProperties struct {
// Path to the proto file that will be used to generate the source
Proto *string `android:"path,arch_variant"`
// List of additional flags to pass to aprotoc
Proto_flags []string `android:"arch_variant"`
}
type protobufDecorator struct {
*BaseSourceProvider
Properties ProtobufProperties
}
func (proto *protobufDecorator) GenerateSource(ctx ModuleContext, deps PathDeps) android.Path {
var protoFlags android.ProtoFlags
pluginPath := ctx.Config().HostToolPath(ctx, "protoc-gen-rust")
protoFlags.OutTypeFlag = "--rust_out"
protoFlags.Flags = append(protoFlags.Flags, " --plugin="+pluginPath.String())
protoFlags.Flags = append(protoFlags.Flags, defaultProtobufFlags...)
protoFlags.Flags = append(protoFlags.Flags, proto.Properties.Proto_flags...)
protoFlags.Deps = append(protoFlags.Deps, pluginPath)
protoFile := android.OptionalPathForModuleSrc(ctx, proto.Properties.Proto)
if !protoFile.Valid() {
ctx.PropertyErrorf("proto", "invalid path to proto file")
}
outDir := android.PathForModuleOut(ctx)
depFile := android.PathForModuleOut(ctx, proto.BaseSourceProvider.getStem(ctx)+".d")
outputs := android.WritablePaths{android.PathForModuleOut(ctx, proto.BaseSourceProvider.getStem(ctx)+".rs")}
rule := android.NewRuleBuilder()
android.ProtoRule(ctx, rule, protoFile.Path(), protoFlags, protoFlags.Deps, outDir, depFile, outputs)
rule.Build(pctx, ctx, "protoc_"+protoFile.Path().Rel(), "protoc "+protoFile.Path().Rel())
proto.BaseSourceProvider.OutputFile = outputs[0]
return outputs[0]
}
func (proto *protobufDecorator) SourceProviderProps() []interface{} {
return append(proto.BaseSourceProvider.SourceProviderProps(), &proto.Properties)
}
func (proto *protobufDecorator) SourceProviderDeps(ctx DepsContext, deps Deps) Deps {
deps = proto.BaseSourceProvider.SourceProviderDeps(ctx, deps)
deps.Rustlibs = append(deps.Rustlibs, "libprotobuf")
return deps
}
// rust_protobuf generates protobuf rust code from the provided proto file. This uses the protoc-gen-rust plugin for
// protoc. Additional flags to the protoc command can be passed via the proto_flags property. This module type will
// create library variants that can be used as a crate dependency by adding it to the rlibs, dylibs, and rustlibs
// properties of other modules.
func RustProtobufFactory() android.Module {
module, _ := NewRustProtobuf(android.HostAndDeviceSupported)
return module.Init()
}
// A host-only variant of rust_protobuf. Refer to rust_protobuf for more details.
func RustProtobufHostFactory() android.Module {
module, _ := NewRustProtobuf(android.HostSupported)
return module.Init()
}
func NewRustProtobuf(hod android.HostOrDeviceSupported) (*Module, *protobufDecorator) {
protobuf := &protobufDecorator{
BaseSourceProvider: NewSourceProvider(),
Properties: ProtobufProperties{},
}
module := NewSourceProviderModule(hod, protobuf, false)
return module, protobuf
}
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