add gorilla and chi helpers
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
parent
2c001628ff
commit
c865c1f665
79
chi.go
Normal file
79
chi.go
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@ -0,0 +1,79 @@
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package main
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import (
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"google.golang.org/protobuf/compiler/protogen"
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)
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var (
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chiPackageFiles map[protogen.GoPackageName]struct{}
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)
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func (g *Generator) chiGenerate(component string, plugin *protogen.Plugin) error {
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chiPackageFiles = make(map[protogen.GoPackageName]struct{})
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for _, file := range plugin.Files {
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if !file.Generate {
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continue
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}
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if len(file.Services) == 0 {
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continue
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}
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if _, ok := chiPackageFiles[file.GoPackageName]; ok {
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continue
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}
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chiPackageFiles[file.GoPackageName] = struct{}{}
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gname := "micro" + "_" + component + ".pb.go"
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gfile := plugin.NewGeneratedFile(gname, ".")
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gfile.P("// Code generated by protoc-gen-micro")
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gfile.P("package ", file.GoPackageName)
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gfile.P()
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gfile.P("import (")
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gfile.P(`"context"`)
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gfile.P(`"fmt"`)
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gfile.P(`"net/http"`)
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gfile.P(`"reflect"`)
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gfile.P(`"strings"`)
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gfile.P(`chi "github.com/go-chi/chi/v4"`)
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gfile.P(`middleware "github.com/go-chi/chi/v4/middleware"`)
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gfile.P(`micro_api "github.com/unistack-org/micro/v3/api"`)
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gfile.P(")")
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gfile.P()
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gfile.P("type routeKey struct{}")
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gfile.P("func RouteName(ctx context.Context) (string, bool) {")
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gfile.P("value, ok := ctx.Value(routeKey{}).(string)")
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gfile.P("return value, ok")
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gfile.P("}")
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gfile.P()
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gfile.P("func RegisterHandlers(r *chi.Mux, h interface{}, eps []*micro_api.Endpoint) error {")
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gfile.P("v := reflect.ValueOf(h)")
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gfile.P("if v.NumMethod() < 1 {")
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gfile.P(`return fmt.Errorf("handler has no methods: %T", h)`)
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gfile.P("}")
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gfile.P("for _, ep := range eps {")
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gfile.P(`idx := strings.Index(ep.Name, ".")`)
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gfile.P("if idx < 1 || len(ep.Name) <= idx {")
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gfile.P(`return fmt.Errorf("invalid api.Endpoint name: %s", ep.Name)`)
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gfile.P("}")
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gfile.P("name := ep.Name[idx+1:]")
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gfile.P("m := v.MethodByName(name)")
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gfile.P("if !m.IsValid() || m.IsZero() {")
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gfile.P(`return fmt.Errorf("invalid handler, method %s not found", name)`)
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gfile.P("}")
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gfile.P("rh, ok := m.Interface().(func(http.ResponseWriter, *http.Request))")
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gfile.P("if !ok {")
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gfile.P(`return fmt.Errorf("invalid handler: %#+v", m.Interface())`)
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gfile.P("}")
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gfile.P("for _, method := range ep.Method {")
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gfile.P("r.With(middleware.WithValue(routeKey{}, ep.Name)).MethodFunc(method, ep.Path[0], rh)")
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gfile.P("}")
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gfile.P("}")
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gfile.P("return nil")
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gfile.P("}")
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}
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return nil
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}
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68
gorilla.go
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68
gorilla.go
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@ -0,0 +1,68 @@
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package main
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import (
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"google.golang.org/protobuf/compiler/protogen"
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)
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var (
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gorillaPackageFiles map[protogen.GoPackageName]struct{}
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)
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func (g *Generator) gorillaGenerate(component string, plugin *protogen.Plugin) error {
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gorillaPackageFiles = make(map[protogen.GoPackageName]struct{})
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for _, file := range plugin.Files {
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if !file.Generate {
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continue
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}
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if len(file.Services) == 0 {
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continue
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}
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if _, ok := gorillaPackageFiles[file.GoPackageName]; ok {
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continue
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}
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gorillaPackageFiles[file.GoPackageName] = struct{}{}
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gname := "micro" + "_" + component + ".pb.go"
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gfile := plugin.NewGeneratedFile(gname, ".")
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gfile.P("// Code generated by protoc-gen-micro")
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gfile.P("package ", file.GoPackageName)
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gfile.P()
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gfile.P("import (")
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gfile.P(`"fmt"`)
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gfile.P(`"net/http"`)
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gfile.P(`"reflect"`)
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gfile.P(`"strings"`)
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gfile.P(`mux "github.com/gorilla/mux"`)
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gfile.P(`micro_api "github.com/unistack-org/micro/v3/api"`)
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gfile.P(")")
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gfile.P()
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gfile.P("func RegisterHandlers(r *mux.Router, h interface{}, eps []*micro_api.Endpoint) error {")
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gfile.P("v := reflect.ValueOf(h)")
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gfile.P("if v.NumMethod() < 1 {")
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gfile.P(`return fmt.Errorf("handler has no methods: %T", h)`)
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gfile.P("}")
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gfile.P("for _, ep := range eps {")
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gfile.P(`idx := strings.Index(ep.Name, ".")`)
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gfile.P("if idx < 1 || len(ep.Name) <= idx {")
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gfile.P(`return fmt.Errorf("invalid api.Endpoint name: %s", ep.Name)`)
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gfile.P("}")
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gfile.P("name := ep.Name[idx+1:]")
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gfile.P("m := v.MethodByName(name)")
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gfile.P("if !m.IsValid() || m.IsZero() {")
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gfile.P(`return fmt.Errorf("invalid handler, method %s not found", name)`)
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gfile.P("}")
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gfile.P("rh, ok := m.Interface().(func(http.ResponseWriter, *http.Request))")
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gfile.P("if !ok {")
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gfile.P(`return fmt.Errorf("invalid handler: %#+v", m.Interface())`)
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gfile.P("}")
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gfile.P("r.HandleFunc(ep.Path[0], rh).Methods(ep.Method...).Name(ep.Name)")
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gfile.P("}")
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gfile.P("return nil")
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gfile.P("}")
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}
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return nil
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}
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39
main.go
39
main.go
@ -8,40 +8,39 @@ import (
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"google.golang.org/protobuf/compiler/protogen"
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)
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var (
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flags flag.FlagSet
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flagDebug *bool
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flagComponents *string
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flagPaths *string
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flagModule *string
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)
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func init() {
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flagDebug = flags.Bool("debug", false, "")
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flagComponents = flags.String("components", "micro", "")
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flagPaths = flag.String("paths", "", "")
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flagModule = flag.String("module", "", "")
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}
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func main() {
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var flags flag.FlagSet
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flagDebug := flags.Bool("debug", false, "")
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flagComponents := flags.String("components", "micro", "")
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flagPaths := flag.String("paths", "", "")
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flagModule := flag.String("module", "", "")
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opts := &protogen.Options{
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ParamFunc: flags.Set,
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}
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g := &Generator{
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debug: *flagDebug,
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components: strings.Split(*flagComponents, "|"),
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paths: *flagPaths,
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module: *flagModule,
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}
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g := &Generator{}
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opts.Run(g.Generate)
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}
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type Generator struct {
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debug bool
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components []string
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paths string
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module string
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}
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func (g *Generator) Generate(plugin *protogen.Plugin) error {
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var err error
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// Protoc passes a slice of File structs for us to process
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for _, component := range g.components {
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for _, component := range strings.Split(*flagComponents, "|") {
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switch component {
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case "micro":
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err = g.microGenerate(component, plugin)
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@ -51,6 +50,10 @@ func (g *Generator) Generate(plugin *protogen.Plugin) error {
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err = g.rpcGenerate(component, plugin)
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case "openapi", "swagger":
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err = g.openapiGenerate(component, plugin)
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case "gorilla":
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err = g.gorillaGenerate(component, plugin)
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case "chi":
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err = g.chiGenerate(component, plugin)
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default:
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err = fmt.Errorf("unknown component: %s", component)
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}
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110
micro.go
110
micro.go
@ -11,10 +11,12 @@ import (
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func (g *Generator) microGenerate(component string, plugin *protogen.Plugin) error {
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for _, file := range plugin.Files {
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if !file.Generate {
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continue
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}
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if len(file.Services) == 0 {
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continue
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}
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gname := file.GeneratedFilenamePrefix + "_" + component + ".pb.go"
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gfile := plugin.NewGeneratedFile(gname, ".")
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@ -39,7 +41,11 @@ func (g *Generator) microGenerate(component string, plugin *protogen.Plugin) err
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// generate services
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for _, service := range file.Services {
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generateService(gfile, service)
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generateServiceEndpoints(gfile, service)
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generateServiceClientInterface(gfile, service)
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generateServiceClientStreamInterface(gfile, service)
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generateServiceServerInterface(gfile, service)
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generateServiceServerStreamInterface(gfile, service)
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}
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}
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@ -47,7 +53,105 @@ func (g *Generator) microGenerate(component string, plugin *protogen.Plugin) err
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return nil
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}
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func generateService(gfile *protogen.GeneratedFile, service *protogen.Service) {
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func generateServerSignature(serviceName string, method *protogen.Method) string {
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methodName := string(method.GoName)
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req := []string{"ctx context.Context"}
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ret := "error"
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if !method.Desc.IsStreamingClient() {
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req = append(req, "req *"+string(method.Input.Desc.Name()))
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}
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if method.Desc.IsStreamingServer() || method.Desc.IsStreamingClient() {
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req = append(req, "stream "+serviceName+"_"+methodName+"Stream")
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}
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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req = append(req, "rsp *"+string(method.Output.Desc.Name()))
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}
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return methodName + "(" + strings.Join(req, ", ") + ") " + ret
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}
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func generateClientSignature(serviceName string, method *protogen.Method) string {
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methodName := string(method.GoName)
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req := ", req *" + string(method.Input.Desc.Name())
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if method.Desc.IsStreamingClient() {
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req = ""
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}
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rsp := "*" + string(method.Output.Desc.Name())
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if method.Desc.IsStreamingClient() || method.Desc.IsStreamingServer() {
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rsp = serviceName + "_" + methodName + "Service"
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}
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return fmt.Sprintf("%s(ctx context.Context%s, opts ...client.CallOption) (%s, error)", methodName, req, rsp)
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}
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func generateServiceClientInterface(gfile *protogen.GeneratedFile, service *protogen.Service) {
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serviceName := strings.TrimSuffix(service.GoName, "Service")
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gfile.P("type ", serviceName, "Service interface {")
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for _, method := range service.Methods {
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gfile.P(generateClientSignature(serviceName, method))
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}
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gfile.P("}")
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gfile.P()
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}
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func generateServiceServerInterface(gfile *protogen.GeneratedFile, service *protogen.Service) {
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serviceName := strings.TrimSuffix(service.GoName, "Service")
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gfile.P("type ", serviceName, "Handler interface {")
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for _, method := range service.Methods {
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gfile.P(generateServerSignature(serviceName, method))
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}
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gfile.P("}")
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gfile.P()
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}
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func generateServiceClientStreamInterface(gfile *protogen.GeneratedFile, service *protogen.Service) {
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serviceName := strings.TrimSuffix(service.GoName, "Service")
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for _, method := range service.Methods {
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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continue
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}
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methodName := method.GoName
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gfile.P("type ", serviceName, "_", methodName, "Service interface {")
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gfile.P("Context() context.Context")
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gfile.P("SendMsg(msg interface{}) error")
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gfile.P("RecvMsg(msg interface{}) error")
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if method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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gfile.P("RecvAndClose() (", method.Output.Desc.Name(), ", error)")
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}
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gfile.P("Close() error")
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if method.Desc.IsStreamingClient() {
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gfile.P("Send(msg *", method.Input.Desc.Name(), ") error")
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}
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if method.Desc.IsStreamingServer() {
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gfile.P("Recv() (msg *", method.Output.Desc.Name(), ", error)")
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}
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}
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}
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func generateServiceServerStreamInterface(gfile *protogen.GeneratedFile, service *protogen.Service) {
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serviceName := strings.TrimSuffix(service.GoName, "Service")
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for _, method := range service.Methods {
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if !method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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continue
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}
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methodName := method.GoName
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gfile.P("type ", serviceName, "_", methodName, "Stream interface {")
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gfile.P("Context() context.Context")
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gfile.P("SendMsg(msg interface{}) error")
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gfile.P("RecvMsg(msg interface{}) error")
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if method.Desc.IsStreamingClient() && !method.Desc.IsStreamingServer() {
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gfile.P("SendAndClose(msg *", method.Output.Desc.Name(), ") error")
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}
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gfile.P("Close() error")
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if method.Desc.IsStreamingClient() {
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gfile.P("Send(msg *", method.Output.Desc.Name(), ") error")
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}
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if method.Desc.IsStreamingServer() {
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gfile.P("Recv() (msg *", method.Input.Desc.Name(), ", error)")
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}
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}
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}
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func generateServiceEndpoints(gfile *protogen.GeneratedFile, service *protogen.Service) {
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serviceName := strings.TrimSuffix(service.GoName, "Service")
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gfile.P("//New", serviceName, "Endpoints provides api endpoints metdata for ", serviceName, " service")
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gfile.P("func New", serviceName, "Endpoints() []*api.Endpoint {")
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