ADR 011: Generalize Genesis Accounts

// GenesisState - all auth state that must be provided at genesis
type GenesisState struct {
    Params   Params           `json:"params" yaml:"params"`
    Accounts []GenesisAccount `json:"accounts" yaml:"accounts"`
}

// InitGenesis - Init store state from genesis data
func InitGenesis(ctx sdk.Context, ak AccountKeeper, data GenesisState) {
    ak.SetParams(ctx, data.Params)
    // load the accounts
    for _, a := range data.Accounts {
    acc := ak.NewAccount(ctx, a) // set account number
        ak.SetAccount(ctx, acc)
}
}

// ExportGenesis returns a GenesisState for a given context and keeper
func ExportGenesis(ctx sdk.Context, ak AccountKeeper)

GenesisState {
    params := ak.GetParams(ctx)

var genAccounts []exported.GenesisAccount
    ak.IterateAccounts(ctx, func(account exported.Account)

bool {
    genAccount := account.(exported.GenesisAccount)

genAccounts = append(genAccounts, genAccount)

return false
})

return NewGenesisState(params, genAccounts)
}

import authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"

// Register the module account type with the auth module codec so it can decode module accounts stored in a genesis file
func init() {
    authtypes.RegisterAccountTypeCodec(ModuleAccount{
}, "cosmos-sdk/ModuleAccount")
}

type ModuleAccount struct {
    ...

var ModuleCdc *codec.LegacyAmino

func init() {
    ModuleCdc = codec.NewLegacyAmino()
    // register module msg's and Account interface
    ...
    // leave the codec unsealed
}

// RegisterAccountTypeCodec registers an external account type defined in another module for the internal ModuleCdc.
func RegisterAccountTypeCodec(o interface{
}, name string) {
    ModuleCdc.RegisterConcrete(o, name, nil)
}

type GenesisAccount interface {
    exported.Account
    Validate()

error
}

// ValidateGenesis performs basic validation of auth genesis data returning an
// error for any failed validation criteria.
func ValidateGenesis(data GenesisState)

error {
    // Validate params
    ...

    // Validate accounts
    addrMap := make(map[string]bool, len(data.Accounts))
    for _, acc := range data.Accounts {

        // check for duplicated accounts
    addrStr := acc.GetAddress().String()
    if _, ok := addrMap[addrStr]; ok {
    return fmt.Errorf("duplicate account found in genesis state; address: %s", addrStr)
}

addrMap[addrStr] = true

        // check account specific validation
    if err := acc.Validate(); err != nil {
    return fmt.Errorf("invalid account found in genesis state; address: %s, error: %s", addrStr, err.Error())
}

 
}

return nil
}