RPC errors proposal

[roman-khimov]

Based on neo-project/neo-modules#728, but differs a bit from it:

• reduced set of groups
• unified missing block/header error
• improved compatibility for -301 and -302

[roman-khimov]

:postal_horn: :postal_horn: :postal_horn: @erikzhang, @shargon, @vncoelho, @devhawk, anyone else :drum: :drum: :drum:

I think we need to move on with this, it's important for dApp development.

[devhawk]

Good proposal to improve the user experience

Agreed. When do we merge this?

[steven1227]

We need this.

[roman-khimov]

Minor adjustments (no new codes) made based on implementation experience from nspcc-dev/neo-go#3063.

[AnnaShaleva]

Just for the record: we've successfully adopted this standard to the NeoGo RPC server in https://github.com/nspcc-dev/neo-go/pull/3063. It works fine in tests and we'll integrate these new error codes into NeoFS as soon as 0.102.0 is released. There's a couple of issues that will be fixed by the usage of new RPC errors standard.

[vncoelho]

Let's move it forward, yes.

[AnnaShaleva]

@roman-khimov, we likely need one more error code: -400 "Access denied" for those methods that require user's authentication. See the https://github.com/neo-project/neo-modules/pull/815#discussion_r1401568346.

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[Jim8y]

@shargon @vncoelho lets move this one forward.

[roman-khimov]

This may also be updated constantly with new calls and others.

I'd just add new ones, new NEPs cost nothing and a particular NEP-XX should mean something specific.

[roman-khimov]

I guess we need a number for it now. 23? https://github.com/neo-project/proposals/pull/133#issuecomment-1245574947 is also relevant here, probably.

[AnnaShaleva]

I guess we need a number for it now. 23?

Since this PR is ready to be merged and is in the final stage, I think 23 is good. We also need to adjust the https://github.com/neo-project/proposals/blob/master/README.mediawiki to include this proposal in the table with "accepted" status and add an "accepted" label to the current PR. I don't know why several "accepted" PRs are not merged yet, but at least we can follow them.

@Jim8y, @shargon, @vncoelho, let's move on with it, what do you think?

[vncoelho]

Sure, I will take another quick read today, but last time I checked it was good already.

[gsmachado]

@vncoelho what's the state of this?

FYI, @Jim8y, @roman-khimov, @erikzhang

[Jim8y]

@gsmachado Its fully implemented and checked by @AnnaShaleva, will be available for the next release.

[Jim8y]

@shargon need you here

[roman-khimov]

While this hasn't been merged yet, two suggestions related to new attributes:

• treat NVB violation (not yet valid transaction) as -510 Expired (annotation can be extended)
• add one more code for Conflicts (when transaction can't be accepted because of conflict), -511/-503 don't really fit for it, -500 can be OK with additional data and yet -513 can be even better for debugging

[superboyiii]

I think it's good to go. Adding a implement link will be better.

[roman-khimov]

Updated, added implementation links.

[superboyiii]

LGTM @shargon @cschuchardt88 @AnnaShaleva @vncoelho @roman-khimov @Jim8y https://github.com/neo-project/neo-modules/pull/815 is already merged.