Attribute Macro entry_point

#[entry_point]

This attribute macro generates the boilerplate required to call into the contract-specific logic from the entry-points to the Wasm module.

It should be added to the contract’s init, handle, migrate and query implementations like this:

#[entry_point]
pub fn instantiate(
    deps: DepsMut,
    env: Env,
    info: MessageInfo,
    msg: InstantiateMsg,
) -> Result<Response, StdError> {
}

#[entry_point]
pub fn execute(
    deps: DepsMut,
    env: Env,
    info: MessageInfo,
    msg: ExecuteMsg,
) -> Result<Response, StdError> {
}

#[entry_point]
pub fn query(
    deps: Deps,
    env: Env,
    msg: QueryMsg,
) -> Result<QueryResponse, StdError> {
}

where InstantiateMsg, ExecuteMsg, and QueryMsg are contract defined types that implement DeserializeOwned + JsonSchema.

Set the version of the state of your contract

The VM will use this as a hint whether it needs to run the migrate function of your contract or not.

#[entry_point]
#[migrate_version(2)]
pub fn migrate(deps: DepsMut, env: Env, msg: MigrateMsg, migrate_info: MigrateInfo) -> StdResult<Response> {
    todo!();
}

It is also possible to assign the migrate version number to a given constant name:

const CONTRACT_VERSION: u64 = 66;

#[entry_point]
#[migrate_version(CONTRACT_VERSION)]
pub fn migrate(deps: DepsMut, env: Env, msg: MigrateMsg, migrate_info: MigrateInfo) -> StdResult<Response> {
    todo!();
}