上下文的内容可以在grpc中传输吗？

Question

I have defined a client and server. They all have a ctx(context) as parameter,client and server communicate by grpc.

type Client interface {
    GetFileVersion(ctx context.Context, in *Req) (*Resp, error)
}

type client struct {
    cc *grpc.ClientConn
}

func (c *client) GetFileVersion(ctx context.Context, in *Req) (*Resp, error) {
    out := new(Resp)
    err := grpc.Invoke(ctx, "/testpb/GetFileVersion", in, out, c.cc, opts...)
    if err != nil {
        return nil, err
    }
    return out, nil
}



type Server interface {
    GetFileVersion(context.Context, *Req) (*Resp, error)
}

If I set value in ctx in the implement of GetFileVersion in client,can I get this value in server?

ctx = context.WithValue(parent, "test", 123)

Answer 1

context is a general purpose registry for global request variables. It is not supposed to escape the request scope. Consider doing this another way.