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proto.go
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proto.go
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// Copyright (c) 2020 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 codegen
import (
"github.com/emicklei/proto"
)
// ProtoModule is an internal representation of a parsed Proto file.
type ProtoModule struct {
PackageName string
FilePath string
Imports []string
Services []*ProtoService
}
// ProtoService is an internal representation of Proto service and methods in that service.
type ProtoService struct {
Name string
RPC []*ProtoRPC
}
// ProtoRPC is an internal representation of Proto RPC method and its request/response types.
type ProtoRPC struct {
Name string
Request *ProtoMessage
Response *ProtoMessage
}
// ProtoMessage is an internal representation of a Proto Message.
type ProtoMessage struct {
Name string
}
type visitor struct {
Module *ProtoModule
}
func newVisitor() *visitor {
return &visitor{
Module: new(ProtoModule),
}
}
func (v *visitor) Visit(proto *proto.Proto) *ProtoModule {
v.Module = &ProtoModule{
FilePath: proto.Filename,
Services: make([]*ProtoService, 0),
Imports: make([]string, 0),
}
for _, e := range proto.Elements {
e.Accept(v)
}
return v.Module
}
func (v *visitor) VisitService(e *proto.Service) {
v.Module.Services = append(v.Module.Services, &ProtoService{
Name: e.Name,
RPC: make([]*ProtoRPC, 0),
})
for _, c := range e.Elements {
c.Accept(v)
}
}
func (v *visitor) VisitRPC(r *proto.RPC) {
s := v.Module.Services[len(v.Module.Services)-1]
s.RPC = append(s.RPC, &ProtoRPC{
Name: r.Name,
Request: &ProtoMessage{Name: r.RequestType},
Response: &ProtoMessage{Name: r.ReturnsType},
})
}
func (v *visitor) VisitPackage(e *proto.Package) {
v.Module.PackageName = e.Name
}
func (v *visitor) VisitImport(e *proto.Import) {
v.Module.Imports = append(v.Module.Imports, e.Filename)
}
// From the current use case, the following visits are no-op
// since we only require the service, rpc methods and the request/response
// types of those methods.
func (v *visitor) VisitMessage(e *proto.Message) {}
func (v *visitor) VisitSyntax(e *proto.Syntax) {}
func (v *visitor) VisitOption(e *proto.Option) {}
func (v *visitor) VisitNormalField(e *proto.NormalField) {}
func (v *visitor) VisitEnumField(e *proto.EnumField) {}
func (v *visitor) VisitEnum(e *proto.Enum) {}
func (v *visitor) VisitComment(e *proto.Comment) {}
func (v *visitor) VisitOneof(o *proto.Oneof) {}
func (v *visitor) VisitOneofField(o *proto.OneOfField) {}
func (v *visitor) VisitReserved(r *proto.Reserved) {}
func (v *visitor) VisitMapField(f *proto.MapField) {}
func (v *visitor) VisitGroup(g *proto.Group) {}
func (v *visitor) VisitExtensions(e *proto.Extensions) {}