/
runner.go
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/
runner.go
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// Copyright (c) 2022 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package protopluginv2
import (
"strings"
"text/template"
"github.com/golang/protobuf/protoc-gen-go/plugin"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/pluginpb"
)
type runner struct {
tmpl *template.Template
templateInfoChecker func(*TemplateInfo) error
baseImports []string
fileToOutputFilename func(*File) (string, error)
unknownFlagHandler func(key string, value string) error
}
func newRunner(
tmpl *template.Template,
templateInfoChecker func(*TemplateInfo) error,
baseImports []string,
fileToOutputFilename func(*File) (string, error),
unknownFlagHandler func(key string, value string) error,
) *runner {
return &runner{
tmpl: tmpl,
templateInfoChecker: templateInfoChecker,
baseImports: baseImports,
fileToOutputFilename: fileToOutputFilename,
unknownFlagHandler: unknownFlagHandler,
}
}
func (r *runner) Run(request *plugin_go.CodeGeneratorRequest) *plugin_go.CodeGeneratorResponse {
registry := newRegistry()
if request.Parameter != nil {
for _, p := range strings.Split(request.GetParameter(), ",") {
spec := strings.SplitN(p, "=", 2)
if len(spec) == 1 {
continue
}
name, value := spec[0], spec[1]
switch {
case name == "import_prefix":
registry.SetPrefix(value)
case strings.HasPrefix(name, "M"):
registry.AddPackageMap(name[1:], value)
default:
if r.unknownFlagHandler != nil {
if err := r.unknownFlagHandler(name, value); err != nil {
return newResponseError(err)
}
}
}
}
}
generator := newGenerator(
registry,
r.tmpl,
r.templateInfoChecker,
r.baseImports,
r.fileToOutputFilename,
)
if err := registry.Load(request); err != nil {
return newResponseError(err)
}
var targets []*File
for _, target := range request.FileToGenerate {
file, err := registry.LookupFile(target)
if err != nil {
return newResponseError(err)
}
targets = append(targets, file)
}
out, err := generator.Generate(targets)
if err != nil {
return newResponseError(err)
}
return newResponseFiles(out)
}
func newResponseFiles(files []*plugin_go.CodeGeneratorResponse_File) *plugin_go.CodeGeneratorResponse {
return &plugin_go.CodeGeneratorResponse{
File: files,
SupportedFeatures: proto.Uint64(uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)),
}
}
func newResponseError(err error) *plugin_go.CodeGeneratorResponse {
return &plugin_go.CodeGeneratorResponse{Error: proto.String(err.Error())}
}