Crate ink_env

The ink_env utilities used to interoperate with the contract executor.

Mainly provides entities to work on a contract’s storage as well as high-level collections on top of those. Also provides environmental utilities, such as storage allocators, FFI to interface with FRAME contracts and a primitive blockchain emulator for simple off-chain testing.

Modules

• call
  Utilities to call or instantiate contracts on the chain.
• chain_extension
  Definitions and utilities for calling chain extension methods.
• hash
  Provides type definitions and traits for the built-in cryptographic hashes.
• test
  Operations on the off-chain testing environment.

Macros

• debug_print
  Appends a formatted string to the debug_message buffer if message recording is enabled in the contracts pallet and if the call is performed via RPC (not via an extrinsic). The debug_message buffer will be:
• debug_println
  Appends a formatted string to the debug_message buffer, as per debug_print but with a newline appended.
• pay_with_call
  Prepend contract message call with value transfer. Used for tests in off-chain environment.

Structs

• CallFlags
  Flags used to change the behaviour of seal_call and seal_delegate_call.
• ReturnFlags
  Flags used by a contract to customize exit behaviour.

Enums

• DefaultEnvironment
  The fundamental types of the default configuration.
• Error
  Errors that can be encountered upon environmental interaction.
• NoChainExtension
  Placeholder for chains that have no defined chain extension.
• ReturnErrorCode
  Every error that can be returned to a contract when it calls any of the host functions.

Constants

• BUFFER_SIZE
  The capacity of the static buffer. Usually set to 16 kB. Can be modified by setting INK_STATIC_BUFFER_SIZE environmental variable.

Traits

• AccountIdGuard
  A trait to enforce that a type should be an Environment::AccountId.
• ContractEnv
  Stores the used host environment type of the ink! smart contract.
• ContractReference
  Refers to the generated ink! smart contract reference type.
• Environment
  The environmental types usable by contracts defined with ink!.
• Event
  Implemented by event types to guide the event topic serialization using the topics builder.
• FromLittleEndian
  Allows to instantiate a type from its little-endian bytes representation.

Functions

• 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.
• block_timestamp
  Returns the current block timestamp.
• call_runtime
  Tries to trigger a runtime dispatchable, i.e. an extrinsic from a pallet.
• caller
  Returns the address of the caller of the executed contract.
• caller_is_origin
  Checks whether the caller of the current contract is the origin of the whole call stack.
• clear_contract_storage
  Clears the contract’s storage entry under the given storage key.
• code_hash
  Retrieves the code hash of the contract at the specified account id.
• contains_contract_storage
  Checks whether there is a value stored under the given storage key in the contract’s storage.
• debug_message
  Appends the given message to the debug message buffer.
• decode_input
  Returns the execution input to the executed contract and decodes it as T.
• ecdsa_recover
  Recovers the compressed ECDSA public key for given signature and message_hash, and stores the result in output.
• ecdsa_to_eth_address
  Returns an Ethereum address from the ECDSA compressed public key.
• emit_event
  Emits an event with the given event data.
• gas_left
  Returns the amount of gas left for the contract execution.
• get_contract_storage
  Returns the value stored under the given storage key in the contract’s storage if any.
• hash_bytes
  Conducts the crypto hash of the given input and stores the result in output.
• hash_encoded
  Conducts the crypto hash of the given encoded input and stores the result in output.
• instantiate_contract
  Instantiates another contract.
• instantiate_contract_v1
  Instantiates another contract.
• invoke_contract
  Invokes a contract message and returns its result.
• invoke_contract_delegate
  Invokes a contract message via delegate call and returns its result.
• invoke_contract_v1
  Invokes a contract message and returns its result.
• is_contract
  Checks whether the specified account is a contract.
• lock_delegate_dependency
  Adds a new delegate dependency lock to the contract.
• minimum_balance
  Returns the minimum balance that is required for creating an account (i.e. the chain’s existential deposit).
• own_code_hash
  Retrieves the code hash of the currently executing contract.
• return_value
  Returns the value back to the caller of the executed contract.
• set_code_hash
  Replace the contract code at the specified address with new code.
• set_contract_storage
  Writes the value to the contract storage under the given storage key and returns the size of pre-existing value if any.
• sr25519_verify
  Verifies a sr25519 signature.
• take_contract_storage
  Removes the value at key, returning the previous value at key from storage.
• terminate_contract
  Terminates the existence of the currently executed smart contract.
• transfer
  Transfers value from the contract to the destination account ID.
• transferred_value
  Returns the transferred value for the contract execution.
• unlock_delegate_dependency
  Unlocks the delegate dependency from the contract.
• weight_to_fee
  Returns the price for the specified amount of gas.

Type Aliases

• Gas
  The default gas type.
• Result
  A result of environmental operations.