package metadata import ( "context" "google.golang.org/grpc" "google.golang.org/grpc/metadata" "go.linka.cloud/grpc/interceptors" ) func NewInterceptors(pairs ...string) interceptors.Interceptors { return mdInterceptors{pairs: pairs} } type mdInterceptors struct { pairs []string } func (i mdInterceptors) UnaryServerInterceptor() grpc.UnaryServerInterceptor { return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) { if err := grpc.SetHeader(ctx, metadata.Pairs(i.pairs...)); err != nil { return nil, err } return handler(ctx, req) } } func (i mdInterceptors) StreamServerInterceptor() grpc.StreamServerInterceptor { return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error { if err := grpc.SetHeader(ss.Context(), metadata.Pairs(i.pairs...)); err != nil { return err } return handler(srv, ss) } } func (i mdInterceptors) UnaryClientInterceptor() grpc.UnaryClientInterceptor { return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error { ctx = metadata.AppendToOutgoingContext(ctx, i.pairs...) return invoker(ctx, method, req, reply, cc, opts...) } } func (i mdInterceptors) 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) { ctx = metadata.AppendToOutgoingContext(ctx, i.pairs...) return streamer(ctx, desc, cc, method, opts...) } }