cron

package
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 Go to latest Published: Jul 6, 2023 License: Apache-2.0 Imports: 21 Imported by: 0

README

Cron

Abstract

This module enables smart contracts on chain to receive callbacks at the beginning and end of each block. Useful for scheduling actions which need to happen every block.

Concepts

Priviledged contracts

An existing contract instantiated on chain which has been elevated to the status of priviledged contract via on-chain governance proposal. Privileged contracts receive some extra superpowers where they can receive callbacks from the BeginBlocker & EndBlocker into their sudo entrypoint. More details on how to use this in here

State

The module state is quite simple. It stores the bech32 address of all the Cosmwasm smart contracts that have been elevated via governance. Once the contract priviledge is demoted via governance, it is removed from state.

Storage keys:

  • PriviledgedContract: 0x01 | contractAddress -> []byte{1}

Begin Blockers

In the ABCI beginblock, the module fetches the list of all priviledged contracts and loops through them and calls the sudo entry point with the BeginBlocker msg. None of the abci.RequestBeginBlock values are passed in.

End Blockers

In the ABCI endblock, the module fetches the list of all priviledged contracts and loops through them and calls the sudo entry point with the EndBlocker msg.

Events

The module emits the following events:

Source type Source name
Keeper SetContractPriviledge
Keeper UnsetContractPriviledge

Client

CLI - Query
list-privileged
starsd q cron list-privileged

List all privileged contract addresses in bech32 format

CLI - Tx
promote-to-privilege-contract || promote-contract
starsd tx gov submit-proposal promote-contract {contractAddr} --title {proposalTitle} --deposit {depositAmount}
starsd tx gov submit-proposal promote-contract stars19jq6mj84cnt9p7sagjxqf8hxtczwc8wlpuwe4sh62w45aheseues57n420 --title "Promote Contract Proposal" --deposit 1000ustars

Creates a governance proposal which on passing will add the given contract address to the priviledged contract list

demote-from-privilege-contract || demote-contract
starsd tx gov submit-proposal demote-contract {contractAddr} --title {proposalTitle} --deposit {depositAmount}
starsd tx gov submit-proposal demote-contract  stars19jq6mj84cnt9p7sagjxqf8hxtczwc8wlpuwe4sh62w45aheseues57n420 --title "Demote Contract Proposal" --deposit 1000ustars

Creates a governance proposal which on passing will remove the given contract address from the priviledged contract list

How to use in CW contract

To use the BeginBlocker & EndBlocker callback from this module, you need to add the following msg type to your contract msgs.

// msg.rs

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum SudoMsg {
    BeginBlock {},
    EndBlock {},
}

// contract.rs

#[cfg_attr(not(feature = "library"), entry_point)]
pub fn sudo(deps: DepsMut, env: Env, msg: SudoMsg) -> Result<Response, ContractError> {
    match msg {
        SudoMsg::BeginBlock {} => !unimplemented(),
        SudoMsg::EndBlock {} => !unimplemented(),
    }
}

Ensure you have a sudo entrypoint in your contract and add your code to be called by the SudoMsg::BeginBlock & SudoMsg::EndBlock. Both endpoints are hit for every privileged contract in the block lifecycle, so ensure both are implemented.

This endpoint is hit at the beginning and end of every block by the x/cron module. The deps and env values are set as expected. It is not possible to receive any input in the BeginBlock & EndBlock call and as such the contract must maintain any relevant state it needs to use.

Attribution

Thanks to Confio and the Tgrade open source project for providing a base for x/cron where most of it's bits were extracted and adapted to only do begin_blocker & end_blocker callbacks.

Found more about Tgrade's twasm module:

x/twasm

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func BeginBlocker 

func BeginBlocker(ctx sdk.Context, k keeper.Keeper, w types.WasmKeeper)

BeginBlocker sends a BeginBlock SudoMsg to all privileged contracts

func EndBlocker 

func EndBlocker(ctx sdk.Context, k keeper.Keeper, w types.WasmKeeper) []abci.ValidatorUpdate

EndBlocker sends a EndBlock SudoMsg to all privileged contracts

func ExportGenesis 

func ExportGenesis(ctx sdk.Context, k keeper.Keeper) *types.GenesisState

ExportGenesis returns the module's exported genesis

func InitGenesis 

func InitGenesis(ctx sdk.Context, k keeper.Keeper, genState types.GenesisState)

InitGenesis initializes the module's state from a provided genesis state.

func RecoverToLog 

func RecoverToLog(logger log.Logger, contractAddr sdk.AccAddress) func()

RecoverToLog catches panic and logs cause to error

Types

type AppModule 

type AppModule struct {
	AppModuleBasic
	// contains filtered or unexported fields
}

AppModule implements the AppModule interface that defines the inter-dependent methods that modules need to implement

func NewAppModule 

func NewAppModule(
	cdc codec.Codec,
	keeper keeper.Keeper,
	wasmKeeper types.WasmKeeper,
) AppModule

func (AppModule) BeginBlock 

func (am AppModule) BeginBlock(ctx sdk.Context, _ abci.RequestBeginBlock)

BeginBlock contains the logic that is automatically triggered at the beginning of each block

func (AppModule) ConsensusVersion 

func (AppModule) ConsensusVersion() uint64

ConsensusVersion is a sequence number for state-breaking change of the module. It should be incremented on each consensus-breaking change introduced by the module. To avoid wrong/empty versions, the initial version should be set to 1

func (AppModule) EndBlock 

func (am AppModule) EndBlock(ctx sdk.Context, _ abci.RequestEndBlock) []abci.ValidatorUpdate

EndBlock contains the logic that is automatically triggered at the end of each block

func (AppModule) ExportGenesis 

func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage

ExportGenesis returns the module's exported genesis state as raw JSON bytes.

func (AppModule) InitGenesis 

func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, gs json.RawMessage) []abci.ValidatorUpdate

InitGenesis performs the module's genesis initialization. It returns no validator updates.

func (AppModule) LegacyQuerierHandler deprecated 

func (am AppModule) LegacyQuerierHandler(_ *codec.LegacyAmino) sdk.Querier

Deprecated: use RegisterServices

func (AppModule) QuerierRoute deprecated 

func (AppModule) QuerierRoute() string

Deprecated: use RegisterServices

func (AppModule) RegisterInvariants 

func (am AppModule) RegisterInvariants(_ sdk.InvariantRegistry)

RegisterInvariants registers the invariants of the module. If an invariant deviates from its predicted value, the InvariantRegistry triggers appropriate logic (most often the chain will be halted)

func (AppModule) RegisterServices 

func (am AppModule) RegisterServices(cfg module.Configurator)

RegisterServices registers a gRPC query service to respond to the module-specific gRPC queries

func (AppModule) Route deprecated 

func (am AppModule) Route() sdk.Route

Deprecated: use RegisterServices

type AppModuleBasic 

type AppModuleBasic struct {
	// contains filtered or unexported fields
}

AppModuleBasic implements the AppModuleBasic interface that defines the independent methods a Cosmos SDK module needs to implement.

func NewAppModuleBasic 

func NewAppModuleBasic(cdc codec.BinaryCodec) AppModuleBasic

func (AppModuleBasic) DefaultGenesis 

func (AppModuleBasic) DefaultGenesis(cdc codec.JSONCodec) json.RawMessage

DefaultGenesis returns a default GenesisState for the module, marshalled to json.RawMessage. The default GenesisState need to be defined by the module developer and is primarily used for testing

func (AppModuleBasic) GetQueryCmd 

func (AppModuleBasic) GetQueryCmd() *cobra.Command

GetQueryCmd returns the root query command for the module. The subcommands of this root command are used by end-users to generate new queries to the subset of the state defined by the module

func (AppModuleBasic) GetTxCmd 

func (a AppModuleBasic) GetTxCmd() *cobra.Command

GetTxCmd returns the root Tx command for the module. The subcommands of this root command are used by end-users to generate new transactions containing messages defined in the module

func (AppModuleBasic) Name 

func (AppModuleBasic) Name() string

Name returns the name of the module as a string

func (AppModuleBasic) RegisterGRPCGatewayRoutes 

func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *runtime.ServeMux)

RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the module

func (AppModuleBasic) RegisterInterfaces 

func (a AppModuleBasic) RegisterInterfaces(reg cdctypes.InterfaceRegistry)

RegisterInterfaces registers a module's interface types and their concrete implementations as proto.Message

func (AppModuleBasic) RegisterLegacyAminoCodec 

func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino)

RegisterLegacyAminoCodec registers the amino codec for the module, which is used to marshal and unmarshal structs to/from []byte in order to persist them in the module's KVStore

func (AppModuleBasic) RegisterRESTRoutes 

func (AppModuleBasic) RegisterRESTRoutes(clientCtx client.Context, rtr *mux.Router)

RegisterRESTRoutes registers the REST routes for the mint module.

func (AppModuleBasic) ValidateGenesis 

func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, _ client.TxEncodingConfig, bz json.RawMessage) error

ValidateGenesis used to validate the GenesisState, given in its json.RawMessage form

Source Files

View all Source files

Directories

Path Synopsis
cli
rest
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