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Google's new protobuf code generator only supports protobuf serialization/deserialization and let other code generators handle RPC-related aspects. This new code generator follows the change and can be used with the new protobuf code generator. Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| Copyright The containerd Authors. | ||
| 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 main | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
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| "google.golang.org/protobuf/compiler/protogen" | ||
| ) | ||
|
|
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| // generator is a Go code generator that uses ttrpc.Server and ttrpc.Client. | ||
| // Unlike the original gogo version, this doesn't generate serializers for message types and | ||
| // let protoc-gen-go handle them. | ||
| type generator struct { | ||
| out *protogen.GeneratedFile | ||
|
|
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| ident struct { | ||
| context string | ||
| server string | ||
| client string | ||
| method string | ||
| } | ||
| } | ||
|
|
||
| func newGenerator(out *protogen.GeneratedFile) *generator { | ||
| gen := generator{out: out} | ||
| gen.ident.context = out.QualifiedGoIdent(protogen.GoIdent{ | ||
| GoImportPath: "context", | ||
| GoName: "Context", | ||
| }) | ||
| gen.ident.server = out.QualifiedGoIdent(protogen.GoIdent{ | ||
| GoImportPath: "github.com/containerd/ttrpc", | ||
| GoName: "Server", | ||
| }) | ||
| gen.ident.client = out.QualifiedGoIdent(protogen.GoIdent{ | ||
| GoImportPath: "github.com/containerd/ttrpc", | ||
| GoName: "Client", | ||
| }) | ||
| gen.ident.method = out.QualifiedGoIdent(protogen.GoIdent{ | ||
| GoImportPath: "github.com/containerd/ttrpc", | ||
| GoName: "Method", | ||
| }) | ||
| return &gen | ||
| } | ||
|
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| func generate(plugin *protogen.Plugin, input *protogen.File) error { | ||
| file := plugin.NewGeneratedFile(input.GeneratedFilenamePrefix+"_ttrpc.pb.go", input.GoImportPath) | ||
| file.P("// Code generated by protoc-gen-go-ttrpc. DO NOT EDIT.") | ||
| file.P("// source: ", input.Desc.Path()) | ||
| file.P("package ", input.GoPackageName) | ||
|
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| gen := newGenerator(file) | ||
| for _, service := range input.Services { | ||
| gen.genService(service) | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| func (gen *generator) genService(service *protogen.Service) { | ||
| fullName := service.Desc.FullName() | ||
| p := gen.out | ||
|
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| serviceName := service.GoName + "Service" | ||
| p.P("type ", serviceName, " interface{") | ||
| for _, method := range service.Methods { | ||
| p.P(method.GoName, | ||
| "(ctx ", gen.ident.context, ",", | ||
| "req *", method.Input.GoIdent, ")", | ||
| "(*", method.Output.GoIdent, ", error)") | ||
| } | ||
| p.P("}") | ||
|
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| // registration method | ||
| p.P("func Register", serviceName, "(srv *", gen.ident.server, ", svc ", serviceName, "){") | ||
| p.P(`srv.Register("`, fullName, `", map[string]`, gen.ident.method, "{") | ||
| for _, method := range service.Methods { | ||
| p.P(`"`, method.GoName, `": func(ctx `, gen.ident.context, ", unmarshal func(interface{}) error)(interface{}, error){") | ||
| p.P("var req ", method.Input.GoIdent) | ||
| p.P("if err := unmarshal(&req); err != nil {") | ||
| p.P("return nil, err") | ||
| p.P("}") | ||
| p.P("return svc.", method.GoName, "(ctx, &req)") | ||
| p.P("},") | ||
| } | ||
| p.P("})") | ||
| p.P("}") | ||
|
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| clientType := service.GoName + "Client" | ||
| clientStructType := strings.ToLower(clientType[:1]) + clientType[1:] | ||
| p.P("type ", clientStructType, " struct{") | ||
| p.P("client *", gen.ident.client) | ||
| p.P("}") | ||
| p.P("func New", clientType, "(client *", gen.ident.client, ")", serviceName, "{") | ||
| p.P("return &", clientStructType, "{") | ||
| p.P("client:client,") | ||
| p.P("}") | ||
| p.P("}") | ||
|
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| for _, method := range service.Methods { | ||
| p.P("func (c *", clientStructType, ")", method.GoName, "(", | ||
| "ctx ", gen.ident.context, ",", | ||
| "req *", method.Input.GoIdent, ")", | ||
| "(*", method.Output.GoIdent, ", error){") | ||
| p.P("var resp ", method.Output.GoIdent) | ||
| p.P(`if err := c.client.Call(ctx, "`, fullName, `", "`, method.Desc.Name(), `", req, &resp); err != nil {`) | ||
| p.P("return nil, err") | ||
| p.P("}") | ||
| p.P("return &resp, nil") | ||
| p.P("}") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| Copyright The containerd Authors. | ||
| 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 main | ||
|
|
||
| import ( | ||
| "google.golang.org/protobuf/compiler/protogen" | ||
| ) | ||
|
|
||
| func main() { | ||
| protogen.Options{}.Run(func(gen *protogen.Plugin) error { | ||
| for _, f := range gen.Files { | ||
| if !f.Generate { | ||
| continue | ||
| } | ||
| if err := generate(gen, f); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| }) | ||
| } |
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