Environment Functions

ink! exposes a number of handy environment functions. A full overview is found here.

In an #[ink(constructor)] use Self::env() to access those, in an #[ink(message)] use self.env(). So e.g. Self::env().caller() or self.env().caller().

Some handy functions include:

• caller(): Returns the address of the caller of the executed contract.
• account_id(): Returns the account ID of the executed contract.
• balance(): Returns the balance of the executed contract.
• block_number(): Returns the current block number.
• random(): Returns a random hash seed.
• emit_event(…): Emits an event with the given event data.
• transfer(…): Transfers value from the contract to the destination account ID.
• hash_bytes(…): Conducts the crypto hash of the given input and stores the result in output.
• …and many more.