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74 lines
2.7 KiB
Markdown
74 lines
2.7 KiB
Markdown
<!--
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order: 2
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-->
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# State
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## Parameters and Genesis State
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`Parameters` define the list of conversion pairs allowed to be converted between Kava ERC20 tokens & sdk.Coins, and the list of native cosmos sdk.Coins that are allowed to be converted to ERC20s.
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```protobuf
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// Params defines the evmutil module params
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message Params {
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// enabled_conversion_pairs defines the list of conversion pairs allowed to be
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// converted between Kava ERC20 and sdk.Coin
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repeated ConversionPair enabled_conversion_pairs = 4;
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// allowed_cosmos_denoms is a list of denom & erc20 token metadata pairs.
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// if a denom is in the list, it is allowed to be converted to an erc20 in the evm.
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repeated AllowedCosmosCoinERC20Token allowed_cosmos_denoms = 1;
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}
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// ConversionPair defines a Kava ERC20 address and corresponding denom that is
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// allowed to be converted between ERC20 and sdk.Coin
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message ConversionPair {
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// ERC20 address of the token on the Kava EVM
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bytes kava_erc20_address = 1;
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// Denom of the corresponding sdk.Coin
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string denom = 2;
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}
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// AllowedCosmosCoinERC20Token defines allowed cosmos-sdk denom & metadata
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// for evm token representations of sdk assets.
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// NOTE: once evm token contracts are deployed, changes to metadata for a given
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// cosmos_denom will not change metadata of deployed contract.
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message AllowedCosmosCoinERC20Token {
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option (gogoproto.goproto_getters) = false;
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// Denom of the sdk.Coin
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string cosmos_denom = 1;
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// Name of ERC20 contract
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string name = 2;
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// Symbol of ERC20 contract
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string symbol = 3;
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// Number of decimals ERC20 contract is deployed with.
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uint32 decimals = 4;
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}
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```
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`GenesisState` defines the state that must be persisted when the blockchain stops/restarts in order for normal function of the evmutil module to resume.
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```protobuf
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message GenesisState {
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// previously stored accounts containing fractional balances.
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reserved 1;
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Params params = 2 [(gogoproto.nullable) = false];
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}
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```
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## Deployed Cosmos Coin Contract Addresses
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Addresses for the ERC20 contracts representing cosmos-sdk `Coin`s are kept in the module store. They are stored as bytes by the cosmos-sdk denom they represent.
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Example:
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If a contract for representing the cosmos-sdk denom `cow` as an ERC20 in the EVM is deployed by the module to the address `0xbeef00000000000000000000000000000000beef`, the module store will contain:
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`0x01 | bytes("cow") => bytes(0xbeef00000000000000000000000000000000beef)`
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Where `0x01` is the `DeployedCosmosCoinContractKeyPrefix` defined in [keys.go](../types/keys.go).
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## Store
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For complete implementation details for how items are stored, see [keys.go](../types/keys.go). `x/evmutil` store state consists of accounts and deployed contract addresses.
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