grpc/interceptors/metadata/forward.go
Adphi 4de0ec6a3b
add metadata forwarder server interceptors
Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>
2022-07-16 16:43:00 +02:00

54 lines
1.4 KiB
Go

package metadata
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"go.linka.cloud/grpc/interceptors"
)
func NewForwardInterceptors() interceptors.ServerInterceptors {
return &forward{}
}
type forward struct{}
func (f *forward) UnaryServerInterceptor() grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
if md, ok := metadata.FromIncomingContext(ctx); ok {
ctx = metadata.NewOutgoingContext(ctx, md.Copy())
}
return handler(ctx, req)
}
}
func (f *forward) StreamServerInterceptor() grpc.StreamServerInterceptor {
return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
ctx := ss.Context()
md1, ok := metadata.FromIncomingContext(ctx)
if !ok {
return handler(srv, ss)
}
o := md1.Copy()
if md2, ok := metadata.FromOutgoingContext(ctx); ok {
o = metadata.Join(o, md2.Copy())
}
return handler(srv, NewContextServerStream(metadata.NewOutgoingContext(ctx, o), ss))
}
}
func NewContextServerStream(ctx context.Context, ss grpc.ServerStream) grpc.ServerStream {
return &ContextWrapper{ServerStream: ss, ctx: ctx}
}
type ContextWrapper struct {
grpc.ServerStream
ctx context.Context
}
func (w *ContextWrapper) Context() context.Context {
return w.ctx
}