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generator.go
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/
generator.go
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package main
import (
"bytes"
"fmt"
"io"
"strings"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
)
type generator struct {
request *plugin.CodeGeneratorRequest
fDescriptions map[string]*fileWrapper
genFiles map[string]bool
packageWrappers map[string]*fileWrapper
renderer Renderer
options Options
}
type templatePayload struct {
Imports []string
Package string
ProtoPackage string
Name string
Methods []methodPayload
TypeMetadata []typeMetadata
First bool
}
type typeMetadata struct {
methodType
IsReceived bool
IsSent bool
ClientStreamed bool
ServerStreamed bool
}
type methodType struct {
Pkg string
Name string
}
type methodPayload struct {
Name string
Input methodType
Output methodType
ClientStreaming bool
ServerStreaming bool
}
func (g *generator) Generate() (*plugin.CodeGeneratorResponse, error) {
resp := &plugin.CodeGeneratorResponse{}
generatedPackage := "grpc"
if g.options.Package != "" {
generatedPackage = g.options.Package
}
for name := range g.genFiles {
d := g.fDescriptions[name]
serviceImport := importString(*d)
for i, s := range d.Service {
payload := templatePayload{
Package: generatedPackage,
First: (i == 0),
}
_, pkg, _ := d.goPackageOption()
payload.ProtoPackage = string(pkg)
payload.Name = s.GetName()
payload.Imports = serviceImports(s, serviceImport, g.packageWrappers)
payload.Methods = methodPayloads(d.GetPackage(), s.GetName(), s.Method, g.packageWrappers)
payload.TypeMetadata = typeMetadatas(s.Method, g.packageWrappers)
buff := bytes.Buffer{}
err := g.renderer.Execute(&buff, &payload)
if err != nil {
return nil, fmt.Errorf("unable to execute template for %s: %v", name, err)
}
c := buff.String()
fName := fmt.Sprintf("%s.gen.go", strings.ToLower(payload.Name))
resp.File = append(resp.File, &plugin.CodeGeneratorResponse_File{
Name: &fName,
Content: &c,
})
}
}
return resp, nil
}
func serviceImports(sd *descriptor.ServiceDescriptorProto, serviceImport string, w map[string]*fileWrapper) []string {
importMap := map[string]bool{
serviceImport: true,
}
requiredPackages := make(map[string]bool)
for _, m := range sd.Method {
pkg, typ := splitType(m.GetInputType())
requiredPackages[fmt.Sprintf("%s.%s", pkg, typ)] = true
pkg, typ = splitType(m.GetOutputType())
requiredPackages[fmt.Sprintf("%s.%s", pkg, typ)] = true
}
for pkg := range requiredPackages {
importDescription := w[pkg]
importMap[importString(*importDescription)] = true
}
imports := make([]string, 0, len(importMap))
for importStr := range importMap {
imports = append(imports, importStr)
}
return imports
}
func importString(fw fileWrapper) string {
path, pkg, _ := fw.goPackageOption()
if strings.HasSuffix(string(path), string(pkg)) {
return path.String()
}
return fmt.Sprintf("%s %s", pkg, path.String())
}
func methodPayloads(pkg string, svcName string, protoMethods []*descriptor.MethodDescriptorProto, w map[string]*fileWrapper) []methodPayload {
methods := make([]methodPayload, len(protoMethods))
for i, m := range protoMethods {
p := methodPayload{
Name: *m.Name,
Input: resolvedType(m.GetInputType(), w),
Output: resolvedType(m.GetOutputType(), w),
ClientStreaming: m.GetClientStreaming(),
ServerStreaming: m.GetServerStreaming(),
}
methods[i] = p
}
return methods
}
func resolvedType(ts string, packageWrappers map[string]*fileWrapper) methodType {
protoPackage, ty := splitType(ts)
_, pkg, _ := packageWrappers[fmt.Sprintf("%s.%s", protoPackage, ty)].goPackageOption()
return methodType{
Pkg: string(pkg),
Name: ty,
}
}
func typeMetadatas(methods []*descriptor.MethodDescriptorProto, w map[string]*fileWrapper) []typeMetadata {
tmp := make(map[methodType]typeMetadata)
for _, m := range methods {
iType := resolvedType(m.GetInputType(), w)
ty, ok := tmp[iType]
if !ok {
ty = typeMetadata{
methodType: iType,
}
}
ty.IsReceived = true
ty.ClientStreamed = ty.ClientStreamed || m.GetClientStreaming()
tmp[iType] = ty
oType := resolvedType(m.GetOutputType(), w)
ty, ok = tmp[oType]
if !ok {
ty = typeMetadata{
methodType: oType,
}
}
ty.IsSent = true
ty.ServerStreamed = ty.ServerStreamed || m.GetServerStreaming()
tmp[oType] = ty
}
metadata := make([]typeMetadata, 0, len(tmp))
for _, t := range tmp {
metadata = append(metadata, t)
}
return metadata
}
func resolveStreamingType(pkg string, svcName string, methodName string) string {
return fmt.Sprintf("%s.%s_%sServer", pkg, svcName, methodName)
}
func splitType(ts string) (string, string) {
ts = strings.TrimPrefix(ts, ".")
i := strings.LastIndex(ts, ".")
return ts[:i], ts[i+1:]
}
type Renderer interface {
Execute(io.Writer, interface{}) error
}
func Generate(req *plugin.CodeGeneratorRequest, options Options, renderer Renderer) (*plugin.CodeGeneratorResponse, error) {
g := generator{
request: req,
fDescriptions: make(map[string]*fileWrapper),
genFiles: make(map[string]bool),
packageWrappers: make(map[string]*fileWrapper),
renderer: renderer,
options: options,
}
for _, f := range req.ProtoFile {
w := &fileWrapper{FileDescriptorProto: f}
g.fDescriptions[f.GetName()] = w
for _, m := range f.MessageType {
g.packageWrappers[fmt.Sprintf("%s.%s", f.GetPackage(), m.GetName())] = w
}
for _, e := range f.EnumType {
g.packageWrappers[fmt.Sprintf("%s.%s", f.GetPackage(), e.GetName())] = w
}
}
for _, name := range req.FileToGenerate {
g.genFiles[name] = true
}
return g.Generate()
}