Wallet Plugins for perfect GAS estimation on contract-specific invocations

[igormcoelho]

Summary or problem description
As pointed out by @nicolegys and @ArithMegatron, there can be some practical challenges on using Refuel operation (giving more GAS during execution).
In my opinion, the best way to provide precise GAS estimation for contract-specific setups, is to allow the development of Wallet plugins that are made specifically for contract-specific invocations.
For example, I develop some NEP-17, and my operations require some specific amount of GAS, or some other data treatment to make users spend less (contracts will work anyway, we are just discussing ways of being more efficient). So I provide special .dll, .so, or any other binary/code extension into their wallet (or some script?), that is invoked just for their operations.

Do you have any solution you want to propose?
Allow Wallet extensions for contract-specific invocations (such as NEP-17), that provide precise GAS calculations.

Neo Version

• Neo 3

Where in the software does this update applies to?

• Other: Wallet

[igormcoelho]

See #2444

[roman-khimov]

I provide special .dll, .so, or any other binary/code extension into their wallet (or some script?), that is invoked just for their operations

1. Won't work with any non-C# node/wallet.
2. I already envision "Install THIS plugin for FREE Neo N3 transactions right NOW!!!" things going on.

[igormcoelho]

I agree with both points @roman-khimov , and specially "Install THIS plugin for FREE Neo N3 transactions right NOW!!!" hahaha 😂

But this only happens if users install unsupported plugins/wallets, and that's why this issue is important: to discuss safe interfaces for doing that. If we fail to provide that, rogue contract-specific wallets that provide cheap or free operations will prevail.