[v18] Juno x/burn module

[Reecepbcups]

Closes #647

Files of importance

• x/burn/* (more of a wasm plugin override than a module)
• app/keepers/keepers.go -> wasmkeeper.WithMessageHandler

Usage

There are 2 ways to burn tokens

1. Send directly to the module account address juno1mj7t69y4r2adl3cnuq8y9uundkzawvx6avu7nj
2. Bank::Burn in CosmWasm

TODO

• e2e test https://github.com/dimiandre/cw-testburn
• once above is done, remoev old MessageHandlerDecorator in keepers.go

[dimiandre]

This way the query "juno q bank total" will be wrong and It's used by many third party services.

I'm not sure if this is the proper way to do it.

Probably better to keep the standard burn functions and modify our mint module so that it's also reduced in minter.TargetSupply

[Reecepbcups]

TODO: Voting yes on the Unity contract continues to fail for not passing vote. Very odd its effecting SudoContracts

[dimiandre]

@Reecepbcups I pushed a new commit.

The burning was not working before because coins were sent to x/junoburn module but burn was happening on x/wasm

My commit:

1. Removes burn permissions to x/wasm. This is to prevent other part of wasm handing burns in a not appropriate way. For example: https://github.com/CosmWasm/wasmd/blob/6a2bffd479acd212d76ac92681b1b6ec099e649d/x/wasm/keeper/keeper.go#L1188
2. Give burn permission to junoburn module/plugin
3. Fix module names, tokens are now transfered & burned from junoburn and never reaching wasm account
4. Remove the total supply adjustment in mint module, it's not needed because we are modifying the target supply

This can be tested using docker and test contract in this repository https://github.com/dimiandre/cw-testburn/blob/39d44cc74911d34a369ed1d9af0af07efaefd982/contracts/first-contract/src/contract.rs#L50

junod tx wasm store ./first_contract-aarch64.wasm --from docker --gas-prices 0.001ujunox --gas 5000000

junod tx wasm instantiate 1 '{}' --admin="juno16g2rahf5846rxzp3fwlswy08fz8ccuwk03k57y" --from docker --gas-prices 0.0001ujunox --label "burn contract"

junod tx wasm execute juno14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9skjuwg8 '{"burn_token":{}}' --amount 1000000ujunox --from docker --gas-prices 0.0001ujunox

junod q bank balances juno16g2rahf5846rxzp3fwlswy08fz8ccuwk03k57y

[dimiandre]

lgtm!

great job with contract refactor and tests!