Triple exception return

package main

import (
"context"
)

import (
"dubbo.apache.org/dubbo-go/v3/common/logger"

  // Use an exception library that can record battle information, here we take "github.com/pkg/errors" as an example
"github.com/pkg/errors"
)

import (
triplepb "github.com/apache/dubbo-go-samples/api"
)


// A service provider structure that implements the pb interface
type ErrorResponseProvider struct {
triplepb. UnimplementedGreeterServer
}

// return error interface
func (s *ErrorResponseProvider) SayHello(ctx context.Context, in *triplepb.HelloRequest) (*triplepb.User, error) {
logger.Infof("Dubbo3 GreeterProvider get user name = %s\n" + in.Name)
  // return user-defined exception
return &triplepb.User{Name: "Hello " + in.Name, Id: "12345", Age: 21}, errors.New("user defined error")
}

package main

import (
"context"
)

import (
"dubbo.apache.org/dubbo-go/v3/common/logger"
"dubbo.apache.org/dubbo-go/v3/config"
_ "dubbo.apache.org/dubbo-go/v3/imports"

tripleCommon "github.com/dubbogo/triple/pkg/common"
)

import (
triplepb "github.com/apache/dubbo-go-samples/api"
)

var greeterProvider = new(triplepb. GreeterClientImpl)

func init() {
config. SetConsumerService(greeterProvider)
}

func main() {
if err := config.Load(); err != nil {
panic(err)
}

req := triplepb.HelloRequest{
Name: "Laurence",
}

  // initiate the call
if user, err := greeterProvider. SayHello(context. TODO(), &req); err != nil {
    // Print the exception information, err.Error() will return a user-defined message, namely user defined error
logger.Infof("response result: %v, error = %s", user, err)
    
    // Print the exception stack, it needs to be asserted as tripleCommon.TripleError
logger.Infof("error details = %+v", err.(tripleCommon.TripleError).Stacks())
}
}

2021-11-12T18:36:33.730+0800 INFO cmd/client.go:53 response result: , error = user defined error
2021-11-12T18:36:33.730+0800 INFO cmd/client.go:54 error details = [type.googleapis.com/google.rpc.DebugInfo]:{stack_entries:"user defined error
main.(*ErrorResponseProvider).SayHello
       /dubbo-go-samples/error/triple/pb/go-server/cmd/error_reponse.go:40
reflect.Value.call
       /usr/local/go/src/reflect/value.go:543
reflect.Value.Call
       /usr/local/go/src/reflect/value.go:339
dubbo.apache.org/dubbo-go/v3/common/proxy/proxy_factory.(*ProxyInvoker).Invoke
       /Users/laurence/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.0.0-rc4-1/common/proxy/proxy_factory/default.go:145
       ...