forked from networkservicemesh/networkservicemesh
/
interceptor.go
66 lines (58 loc) · 1.81 KB
/
interceptor.go
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package tools
import (
"context"
"fmt"
"reflect"
"github.com/networkservicemesh/networkservicemesh/pkg/tools/spanhelper"
"github.com/golang/protobuf/proto"
"google.golang.org/grpc"
)
func allocate(typ reflect.Type) interface{} {
return reflect.New(typ).Interface()
}
func dereferenceType(ptr interface{}) reflect.Type {
return reflect.Indirect(reflect.ValueOf(ptr)).Type()
}
func memset(ptr interface{}, value proto.Message) {
clone := reflect.ValueOf(proto.Clone(value)).Elem()
reflect.ValueOf(ptr).Elem().Set(clone)
}
func CloneArgsClientInterceptor(uci grpc.UnaryClientInterceptor) grpc.UnaryClientInterceptor {
return func(
ctx context.Context,
method string,
req, reply interface{},
cc *grpc.ClientConn,
invoker grpc.UnaryInvoker,
opts ...grpc.CallOption,
) error {
span := spanhelper.GetSpanHelper(ctx)
replyPtr := allocate(dereferenceType(reply))
reqCopy := proto.Clone(req.(proto.Message))
span.LogObject(fmt.Sprintf("%v()", method), "")
span.LogObject("request", reqCopy)
err := uci(ctx, method, reqCopy, replyPtr, cc, invoker, opts...)
memset(reply, replyPtr.(proto.Message))
span.LogObject("response", reply)
return err
}
}
func CloneArgsServerInterceptor(usi grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor {
return func(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (resp interface{}, err error) {
reqCopy := proto.Clone(req.(proto.Message))
myHandler := func(ctx context.Context, req interface{}) (interface{}, error) {
span := spanhelper.GetSpanHelper(ctx)
span.LogObject(fmt.Sprintf("GRPC->%v()", info.FullMethod), "")
span.LogObject("request", reqCopy)
response, err := handler(ctx, req)
span.LogObject("response", response)
return response, err
}
return usi(ctx, reqCopy, info, myHandler)
}
}