feat: Support for multiple rpc service generation and rpc grouping (#1972)

* Add group & compatible flag

* Add group & compatible flag

* Support for multiple rpc service generation and rpc grouping

* Support for multiple rpc service generation and rpc grouping

* Format code

* Format code

* Add comments

* Fix unit test

* Refactor function name

* Add example & Update grpc readme

* go mod tidy

* update mod

* update mod

tools/goctl/rpc/parser/service.go

@@ -1,10 +1,54 @@
 package parser
 
-import "github.com/emicklei/proto"
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
 
-// Service describes the rpc service, which is the relevant
-// content after the translation of the proto file
-type Service struct {
-	*proto.Service
-	RPC []*RPC
+	"github.com/emicklei/proto"
+)
+
+type (
+	// Services is a slice of Service.
+	Services []Service
+
+	// Service describes the rpc service, which is the relevant
+	// content after the translation of the proto file
+	Service struct {
+		*proto.Service
+		RPC []*RPC
+	}
+)
+
+func (s Services) validate(filename string, multipleOpt ...bool) error {
+	if len(s) == 0 {
+		return errors.New("rpc service not found")
+	}
+
+	var multiple bool
+	for _, c := range multipleOpt {
+		multiple = c
+	}
+
+	if !multiple && len(s) > 1 {
+		return errors.New("only one service expected")
+	}
+
+	name := filepath.Base(filename)
+	for _, service := range s {
+		for _, rpc := range service.RPC {
+			if strings.Contains(rpc.RequestType, ".") {
+				return fmt.Errorf("line %v:%v, request type must defined in %s",
+					rpc.Position.Line,
+					rpc.Position.Column, name)
+			}
+			if strings.Contains(rpc.ReturnsType, ".") {
+				return fmt.Errorf("line %v:%v, returns type must defined in %s",
+					rpc.Position.Line,
+					rpc.Position.Column, name)
+			}
+		}
+	}
+	return nil
 }