How to override DefaultGenesis?

youngjoon-lee · September 25, 2020, 2:26am

Hi all,

I’ve been implementing a blockchain on the top of the Cosmos SDK.

Everything works well, but I’d like to override DefaultGenesis functions of some modules (such as ‘staking’).
For example, I want to use a custom value of MaxValidators, instead of the DefaultMaxValidators defined in the x/staking/types/params.go.

But, it seems there is no way to override the value.
In the genutilcli.InitCmd(), the DefaultGenesis() is used.

Please suggest any idea how to override default genesis params of the existing modules.
Thank you.

Youngjoon

jhernandezb · September 28, 2020, 10:39pm

Which version of the sdk are you using?

We made a wrapper round the init command so after it generates the genesis it reads the file again and set our custom default params as bond_denom, and others.

github.com

public-awesome/stakebird/blob/ae80ee9bd30c0958d5f57a1e84d6650ddbfd864f/cmd/staked/init.go#L95


		if err != nil {
			return appState, err
		}
		mintGenState.Params.MintDenom = stakeDenom
		appState[mint.ModuleName] = cdc.MustMarshalJSON(mintGenState)
	}
	return appState, nil
}

// InitCmd wraps the genutil.InitCmd to inject specific settings for rocket chain
func InitCmd(ctx *server.Context, cdc codec.JSONMarshaler, mbm module.BasicManager,
	defaultNodeHome string) *cobra.Command {

	init := genutilcli.InitCmd(ctx, cdc, app.ModuleBasics, app.DefaultNodeHome)
	init.PostRunE = func(cmd *cobra.Command, args []string) error {
		config := ctx.Config
		config.SetRoot(viper.GetString(cli.HomeFlag))

		genFile := config.GenesisFile()
		genDoc := &types.GenesisDoc{}

youngjoon-lee · September 29, 2020, 4:10am

Awesome! Thank you. I’m using v0.37.14. It seems it has the PostRunE.

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How to override DefaultGenesis?

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