Think about ReadFrom/WriteToV2 one more time

[carpawell]

Problem

With ReadFromV2 it mostly always required more lines of code to achieve the same thing with ToV2 and FromV2 that allocate structs inside. We can think about some helpers placed near the methods.

Context

Updating SDK in some old code or writing a new code can be annoying with these totally necessary lines (when there is no need to reuse struct b/w reading or writing protocol conversions). This approach was presented in #170 and we had some long discussions, it was not an easy change.

[cthulhu-rider]

normally conversion to and from message to SDK entities should be done in exactly one place: https://pkg.go.dev/github.com/nspcc-dev/neofs-sdk-go/client and https://pkg.go.dev/github.com/nspcc-dev/[email protected]/pkg/network/transport respectively. V2-converters accidentally went beyond these two spaces of the system, so you are experiencing a headache

• keep an eye on Use single layer of messages neofs-api-go#395

[carpawell]

It does not matter if I need to use it in a single package or in a dozen packages, if I write tests, or if I am a regular SDK user. I just do it sometimes. The same way I encode cID and oID and maybe some other things that I forget about now. I just need more lines of (boilerplate) code for no reason (usually).

keep an eye on nspcc-dev/neofs-api-go#395

How can this help me?

[cthulhu-rider]

@carpawell, u've not described the exact problem yet in form: i want this but the only way is to cast into v2. If u have the case, report it

if u have some useful helpers, just propose it in PR or create an enhancement issue

[carpawell]

If u have the case, report it

Why do we need cases for exported methods in the "SDK" repo? We already have them (methods) and we are not gonna delete them. Why do I need this? Why this file has to have refs package imported now? Why do i have to explicitly create a var to fill it in go?

in form: i want this but the only way is to cast into v2

The same way I have to encode/decode addresses, IDs, etc. Why? That is not about V2 only.

create an enhancement issue

We are discussing such an issue right now.

[roman-khimov]

ReadFrom is supposed to be more efficient in some cases (preallocated things, you know it). In practice we have a lot of cases where we do not have anything preallocated. Additional NewFromV2 could be helpful to drop some repetitive code.