grpc/interceptors/defaulter/interceptors.go

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package defaulter
import (
"context"
"google.golang.org/grpc"
"go.linka.cloud/grpc-toolkit/interceptors"
)
type interceptor struct{}
func NewInterceptors() interceptors.Interceptors {
return &interceptor{}
}
func defaults(v interface{}) {
if d, ok := v.(interface{ Default() }); v != nil && ok {
d.Default()
}
}
func (i interceptor) UnaryServerInterceptor() grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
defaults(req)
return handler(ctx, req)
}
}
func (i interceptor) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
defaults(req)
return invoker(ctx, method, req, reply, cc, opts...)
}
}
func (i interceptor) StreamServerInterceptor() grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
wrapper := &recvWrapper{ServerStream: stream}
return handler(srv, wrapper)
}
}
func (i interceptor) StreamClientInterceptor() grpc.StreamClientInterceptor {
return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
desc.Handler = (&sendWrapper{handler: desc.Handler}).Handler()
return streamer(ctx, desc, cc, method)
}
}
type recvWrapper struct {
grpc.ServerStream
}
func (s *recvWrapper) RecvMsg(m interface{}) error {
if err := s.ServerStream.RecvMsg(m); err != nil {
return err
}
defaults(m)
return nil
}
type sendWrapper struct {
grpc.ServerStream
handler grpc.StreamHandler
}
func (s *sendWrapper) Handler() grpc.StreamHandler {
return func(srv interface{}, stream grpc.ServerStream) error {
return s.handler(srv, s)
}
}
func (s *sendWrapper) SendMsg(m interface{}) error {
defaults(m)
return s.ServerStream.SendMsg(m)
}