/
generator.go
173 lines (143 loc) · 4 KB
/
generator.go
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package generator
import (
"bytes"
"fmt"
"go/format"
"path"
"path/filepath"
"strings"
"github.com/golang/glog"
"github.com/golang/protobuf/proto"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
)
type Generator struct {
reg *descriptor.Registry
imports []descriptor.GoPackage // common imports
}
// New returns a new generator which generates handler wrappers.
func New(reg *descriptor.Registry) *Generator {
return &Generator{
reg: reg,
}
}
func (g *Generator) Generate(targets []*descriptor.File) ([]*plugin.CodeGeneratorResponse_File, error) {
var files []*plugin.CodeGeneratorResponse_File
for _, file := range targets {
if len(file.Services) == 0 {
continue
}
if code, err := g.generateCC(file); err == nil {
files = append(files, code)
} else {
return nil, err
}
}
return files, nil
}
func (g *Generator) generateCC(file *descriptor.File) (*plugin.CodeGeneratorResponse_File, error) {
code, err := g.getCCTemplate(file)
if err != nil {
return nil, err
}
formatted, err := format.Source([]byte(code))
if err != nil {
glog.Errorf("%v: %s", err, annotateString(code))
return nil, err
}
name := filepath.Base(file.GetName())
ext := filepath.Ext(name)
base := strings.TrimSuffix(name, ext)
output := fmt.Sprintf(filepath.Join(file.GoPkg.Path, "%s.pb.cc.go"), base)
output = filepath.Clean(output)
return &plugin.CodeGeneratorResponse_File{
Name: proto.String(output),
Content: proto.String(string(formatted)),
}, nil
}
func (g *Generator) getCCTemplate(f *descriptor.File) (string, error) {
pkgSeen := make(map[string]bool)
var imports []descriptor.GoPackage
for _, pkg := range g.imports {
pkgSeen[pkg.Path] = true
imports = append(imports, pkg)
}
pkgs := [][]string{
{"context", "context"},
{"github.com/pkg/errors", "errors"},
{"github.com/optherium/cckit/gateway", "cckit_gateway"},
{"github.com/optherium/cckit/gateway/service", "cckit_ccservice"},
{"github.com/optherium/cckit/router", "cckit_router"},
{"github.com/optherium/cckit/router/param/defparam", "cckit_defparam"},
{"github.com/optherium/cckit/router/param", "cckit_param"},
}
for _, pkg := range pkgs {
pkgSeen[pkg[0]] = true
imports = append(imports, g.newGoPackage(pkg[0], pkg[1]))
}
for _, svc := range f.Services {
for _, m := range svc.Methods {
checkedAppend := func(pkg descriptor.GoPackage) {
// Add request type package to imports if needed
if m.Options == nil || pkg == f.GoPkg || pkgSeen[pkg.Path] {
return
}
pkgSeen[pkg.Path] = true
// always generate alias for external packages, when types used in req/resp object
//if pkg.Alias == "" {
// pkg.Alias = pkg.Name
// pkgSeen[pkg.Path] = false
//}
imports = append(imports, pkg)
}
checkedAppend(m.RequestType.File.GoPkg)
checkedAppend(m.ResponseType.File.GoPkg)
}
}
p := param{File: f, Imports: imports}
return applyTemplate(p)
}
func (g *Generator) newGoPackage(pkgPath string, aalias ...string) descriptor.GoPackage {
gopkg := descriptor.GoPackage{
Path: pkgPath,
Name: path.Base(pkgPath),
}
alias := gopkg.Name
if len(aalias) > 0 {
alias = aalias[0]
gopkg.Alias = alias
}
reference := alias
if reference == "" {
reference = gopkg.Name
}
for i := 0; ; i++ {
if err := g.reg.ReserveGoPackageAlias(alias, gopkg.Path); err == nil {
break
}
alias = fmt.Sprintf("%s_%d", gopkg.Name, i)
gopkg.Alias = alias
}
pkg[reference] = alias
return gopkg
}
func applyTemplate(p param) (string, error) {
w := bytes.NewBuffer(nil)
if err := headerTemplate.Execute(w, p); err != nil {
return "", err
}
if err := ccTemplate.Execute(w, p); err != nil {
return "", err
}
if err := gatewayTemplate.Execute(w, p); err != nil {
return "", err
}
return w.String(), nil
}
func annotateString(str string) string {
strs := strings.Split(str, "\n")
for pos := range strs {
strs[pos] = fmt.Sprintf("%v: %v", pos, strs[pos])
}
return strings.Join(strs, "\n")
}