pub trait Current {
Show 56 methods
// Required methods
fn random(
subject_ptr: u32,
subject_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>;
fn tombstone_deposit(
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>;
fn debug_message(
str_ptr: u32,
str_len: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn xcm_execute(
msg_ptr: u32,
msg_len: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn set_code_hash(code_hash_ptr: u32) -> Result<ReturnErrorCode, TrapReason>;
fn account_reentrance_count(account_ptr: u32) -> Result<u32, TrapReason>;
fn contains_transient_storage(
key_ptr: u32,
key_len: u32,
) -> Result<u32, TrapReason>;
fn get_transient_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn seal_return(
flags: u32,
data_ptr: u32,
data_len: u32,
) -> Result<(), TrapReason>;
fn take_transient_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn gas_left(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn hash_blake2_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>;
fn get_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn call_chain_extension(
id: u32,
input_ptr: u32,
input_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<u32, TrapReason>;
fn rent_allowance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn instantiation_nonce() -> Result<u64, TrapReason>;
fn balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn lock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>;
fn unlock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>;
fn value_transferred(
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>;
fn restore_to(
_dest_ptr: u32,
_code_hash_ptr: u32,
_rent_allowance_ptr: u32,
_delta_ptr: u32,
_delta_count: u32,
) -> Result<(), TrapReason>;
fn clear_transient_storage(
key_ptr: u32,
key_len: u32,
) -> Result<u32, TrapReason>;
fn minimum_balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn hash_sha2_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>;
fn call_runtime(
call_ptr: u32,
call_len: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn sr25519_verify(
signature_ptr: u32,
pub_key_ptr: u32,
message_len: u32,
message_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn call(
flags: u32,
callee_ptr: u32,
ref_time_limit: u64,
proof_size_limit: u64,
deposit_ptr: u32,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn deposit_event(
topics_ptr: u32,
topics_len: u32,
data_ptr: u32,
data_len: u32,
) -> Result<(), TrapReason>;
fn ecdsa_recover(
signature_ptr: u32,
message_hash_ptr: u32,
output_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn reentrance_count() -> Result<u32, TrapReason>;
fn caller(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn xcm_send(
dest_ptr: u32,
msg_ptr: u32,
msg_len: u32,
output_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn take_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn is_contract(account_ptr: u32) -> Result<u32, TrapReason>;
fn caller_is_root() -> Result<u32, TrapReason>;
fn hash_keccak_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>;
fn ecdsa_to_eth_address(
key_ptr: u32,
out_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn set_rent_allowance(_value_ptr: u32) -> Result<(), TrapReason>;
fn hash_blake2_128(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>;
fn contains_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>;
fn own_code_hash(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn weight_to_fee(
ref_time_limit: u64,
proof_size_limit: u64,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>;
fn input(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn terminate(beneficiary_ptr: u32) -> Result<(), TrapReason>;
fn set_transient_storage(
key_ptr: u32,
key_len: u32,
value_ptr: u32,
value_len: u32,
) -> Result<u32, TrapReason>;
fn delegate_call(
flags: u32,
code_hash_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn clear_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>;
fn address(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn now(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn caller_is_origin() -> Result<u32, TrapReason>;
fn transfer(
account_ptr: u32,
_account_len: u32,
value_ptr: u32,
_value_len: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn block_number(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>;
fn code_hash(
account_ptr: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn instantiate(
code_hash_ptr: u32,
ref_time_limit: u64,
proof_size_limit: u64,
deposit_ptr: u32,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
address_ptr: u32,
address_len_ptr: u32,
output_ptr: u32,
output_len_ptr: u32,
salt_ptr: u32,
salt_len: u32,
) -> Result<ReturnErrorCode, TrapReason>;
fn set_storage(
key_ptr: u32,
key_len: u32,
value_ptr: u32,
value_len: u32,
) -> Result<u32, TrapReason>;
fn noop() -> Result<(), TrapReason>;
}
Expand description
Contains only the latest version of each function.
In reality there are more functions available but they are all obsolete: When a function is updated a new version is added and the old versions stays available as-is. We only list the newest version here. Some functions are available under additional names (aliases) for historic reasons which are omitted here.
If you want an overview of all the functions available to a contact all you need to look at is this trait. It contains only the latest version of each function and no aliases. If you are writing a contract(language) from scratch this is where you should look at.
Required Methods§
sourcefn random(
subject_ptr: u32,
subject_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>
fn random( subject_ptr: u32, subject_len: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<(), TrapReason>
§Deprecated
This function is deprecated and will be removed in future versions. No new code or contracts with this API can be deployed. Stores a random number for the current block and the given subject into the supplied buffer.
The value is stored to linear memory at the address pointed to by out_ptr
.
out_len_ptr
must point to a u32 value that describes the available space at
out_ptr
. This call overwrites it with the size of the value. If the available
space at out_ptr
is less than the size of the value a trap is triggered.
The data is encoded as (T::Hash, frame_system::pallet_prelude::BlockNumberFor::
§Changes from v0
In addition to the seed it returns the block number since which it was determinable by chain observers.
§Note
The returned seed should only be used to distinguish commitments made before the returned block number. If the block number is too early (i.e. commitments were made afterwards), then ensure no further commitments may be made and repeatedly call this on later blocks until the block number returned is later than the latest commitment.
§Wasm Import Statement
(import "seal1" "random" (func ...))
sourcefn tombstone_deposit(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn tombstone_deposit(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
§Deprecated
This function is deprecated and will be removed in future versions. No new code or contracts with this API can be deployed. Stores the tombstone deposit into the supplied buffer.
The value is stored to linear memory at the address pointed to by out_ptr
.
out_len_ptr
must point to a u32 value that describes the available space at
out_ptr
. This call overwrites it with the size of the value. If the available
space at out_ptr
is less than the size of the value a trap is triggered.
§Note
There is no longer a tombstone deposit. This function always returns 0
.
§Wasm Import Statement
(import "seal0" "tombstone_deposit" (func ...))
sourcefn debug_message(
str_ptr: u32,
str_len: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn debug_message( str_ptr: u32, str_len: u32, ) -> Result<ReturnErrorCode, TrapReason>
Emit a custom debug message.
No newlines are added to the supplied message. Specifying invalid UTF-8 just drops the message with no trap.
This is a no-op if debug message recording is disabled which is always the case when the code is executing on-chain. The message is interpreted as UTF-8 and appended to the debug buffer which is then supplied to the calling RPC client.
§Note
Even though no action is taken when debug message recording is disabled there is still a non trivial overhead (and weight cost) associated with calling this function. Contract languages should remove calls to this function (either at runtime or compile time) when not being executed as an RPC. For example, they could allow users to disable logging through compile time flags (cargo features) for on-chain deployment. Additionally, the return value of this function can be cached in order to prevent further calls at runtime.
§Wasm Import Statement
(import "seal0" "debug_message" (func ...))
sourcefn xcm_execute(
msg_ptr: u32,
msg_len: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn xcm_execute( msg_ptr: u32, msg_len: u32, ) -> Result<ReturnErrorCode, TrapReason>
Execute an XCM program locally, using the contract’s address as the origin.
See [pallet_contracts_uapi::HostFn::execute_xcm
].
§Wasm Import Statement
(import "seal0" "xcm_execute" (func ...))
sourcefn set_code_hash(code_hash_ptr: u32) -> Result<ReturnErrorCode, TrapReason>
fn set_code_hash(code_hash_ptr: u32) -> Result<ReturnErrorCode, TrapReason>
Replace the contract code at the specified address with new code.
See [pallet_contracts_uapi::HostFn::set_code_hash
].
§Wasm Import Statement
(import "seal0" "set_code_hash" (func ...))
sourcefn account_reentrance_count(account_ptr: u32) -> Result<u32, TrapReason>
fn account_reentrance_count(account_ptr: u32) -> Result<u32, TrapReason>
Returns the number of times specified contract exists on the call stack. Delegated calls are
not counted as separate calls.
See [pallet_contracts_uapi::HostFn::account_reentrance_count
].
§Wasm Import Statement
(import "seal0" "account_reentrance_count" (func ...))
§Unstable
This function is unstable and it is a subject to change (or removal) in the future. Do not deploy a contract using it to a production chain.
sourcefn contains_transient_storage(
key_ptr: u32,
key_len: u32,
) -> Result<u32, TrapReason>
fn contains_transient_storage( key_ptr: u32, key_len: u32, ) -> Result<u32, TrapReason>
Checks whether there is a value stored under the given key in transient storage.
§Wasm Import Statement
(import "seal0" "contains_transient_storage" (func ...))
§Unstable
This function is unstable and it is a subject to change (or removal) in the future. Do not deploy a contract using it to a production chain.
sourcefn get_transient_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn get_transient_storage( key_ptr: u32, key_len: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
sourcefn seal_return(
flags: u32,
data_ptr: u32,
data_len: u32,
) -> Result<(), TrapReason>
fn seal_return( flags: u32, data_ptr: u32, data_len: u32, ) -> Result<(), TrapReason>
Cease contract execution and save a data buffer as a result of the execution.
See [pallet_contracts_uapi::HostFn::return_value
].
§Wasm Import Statement
(import "seal0" "seal_return" (func ...))
sourcefn take_transient_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn take_transient_storage( key_ptr: u32, key_len: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
sourcefn gas_left(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn gas_left(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the amount of weight left into the supplied buffer.
See [pallet_contracts_uapi::HostFn::gas_left_v1
].
§Wasm Import Statement
(import "seal1" "gas_left" (func ...))
§Unstable
This function is unstable and it is a subject to change (or removal) in the future. Do not deploy a contract using it to a production chain.
sourcefn hash_blake2_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>
fn hash_blake2_256( input_ptr: u32, input_len: u32, output_ptr: u32, ) -> Result<(), TrapReason>
Computes the BLAKE2 256-bit hash on the given input buffer.
See [pallet_contracts_uapi::HostFn::hash_blake2_256
].
§Wasm Import Statement
(import "seal0" "hash_blake2_256" (func ...))
sourcefn get_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn get_storage( key_ptr: u32, key_len: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Retrieve the value under the given key from storage.
See [pallet_contracts_uapi::HostFn::get_storage_v1
]
§Wasm Import Statement
(import "seal1" "get_storage" (func ...))
sourcefn call_chain_extension(
id: u32,
input_ptr: u32,
input_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<u32, TrapReason>
fn call_chain_extension( id: u32, input_ptr: u32, input_len: u32, output_ptr: u32, output_len_ptr: u32, ) -> Result<u32, TrapReason>
Call into the chain extension provided by the chain if any.
See [pallet_contracts_uapi::HostFn::call_chain_extension
].
§Wasm Import Statement
(import "seal0" "call_chain_extension" (func ...))
sourcefn rent_allowance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn rent_allowance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
§Deprecated
This function is deprecated and will be removed in future versions. No new code or contracts with this API can be deployed. Was used to store the rent allowance into the supplied buffer.
§Note
The state rent functionality was removed. This is stub only exists for backwards compatibility.
§Wasm Import Statement
(import "seal0" "rent_allowance" (func ...))
sourcefn instantiation_nonce() -> Result<u64, TrapReason>
fn instantiation_nonce() -> Result<u64, TrapReason>
Returns a nonce that is unique per contract instantiation.
See [pallet_contracts_uapi::HostFn::instantiation_nonce
].
§Wasm Import Statement
(import "seal0" "instantiation_nonce" (func ...))
sourcefn balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the free balance of the current account into the supplied buffer.
See [pallet_contracts_uapi::HostFn::balance
].
§Wasm Import Statement
(import "seal0" "balance" (func ...))
sourcefn lock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>
fn lock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>
Adds a new delegate dependency to the contract.
See [pallet_contracts_uapi::HostFn::lock_delegate_dependency
].
§Wasm Import Statement
(import "seal0" "lock_delegate_dependency" (func ...))
sourcefn unlock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>
fn unlock_delegate_dependency(code_hash_ptr: u32) -> Result<(), TrapReason>
Removes the delegate dependency from the contract.
see [pallet_contracts_uapi::HostFn::unlock_delegate_dependency
].
§Wasm Import Statement
(import "seal0" "unlock_delegate_dependency" (func ...))
sourcefn value_transferred(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn value_transferred(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the value transferred along with this call/instantiate into the supplied buffer.
See [pallet_contracts_uapi::HostFn::value_transferred
].
§Wasm Import Statement
(import "seal0" "value_transferred" (func ...))
sourcefn restore_to(
_dest_ptr: u32,
_code_hash_ptr: u32,
_rent_allowance_ptr: u32,
_delta_ptr: u32,
_delta_count: u32,
) -> Result<(), TrapReason>
fn restore_to( _dest_ptr: u32, _code_hash_ptr: u32, _rent_allowance_ptr: u32, _delta_ptr: u32, _delta_count: u32, ) -> Result<(), TrapReason>
§Deprecated
This function is deprecated and will be removed in future versions. No new code or contracts with this API can be deployed. Was used to restore the given destination contract sacrificing the caller.
§Note
The state rent functionality was removed. This is stub only exists for backwards compatibility
§Wasm Import Statement
(import "seal1" "restore_to" (func ...))
sourcefn minimum_balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn minimum_balance(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the minimum balance (a.k.a. existential deposit) into the supplied buffer.
See [pallet_contracts_uapi::HostFn::minimum_balance
].
§Wasm Import Statement
(import "seal0" "minimum_balance" (func ...))
sourcefn hash_sha2_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>
fn hash_sha2_256( input_ptr: u32, input_len: u32, output_ptr: u32, ) -> Result<(), TrapReason>
Computes the SHA2 256-bit hash on the given input buffer.
See [pallet_contracts_uapi::HostFn::hash_sha2_256
].
§Wasm Import Statement
(import "seal0" "hash_sha2_256" (func ...))
sourcefn call_runtime(
call_ptr: u32,
call_len: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn call_runtime( call_ptr: u32, call_len: u32, ) -> Result<ReturnErrorCode, TrapReason>
Call some dispatchable of the runtime.
See [frame_support::traits::call_runtime
].
§Wasm Import Statement
(import "seal0" "call_runtime" (func ...))
sourcefn sr25519_verify(
signature_ptr: u32,
pub_key_ptr: u32,
message_len: u32,
message_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn sr25519_verify( signature_ptr: u32, pub_key_ptr: u32, message_len: u32, message_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Verify a sr25519 signature
See [pallet_contracts_uapi::HostFn::sr25519_verify
].
§Wasm Import Statement
(import "seal0" "sr25519_verify" (func ...))
sourcefn call(
flags: u32,
callee_ptr: u32,
ref_time_limit: u64,
proof_size_limit: u64,
deposit_ptr: u32,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn call( flags: u32, callee_ptr: u32, ref_time_limit: u64, proof_size_limit: u64, deposit_ptr: u32, value_ptr: u32, input_data_ptr: u32, input_data_len: u32, output_ptr: u32, output_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Make a call to another contract.
See [pallet_contracts_uapi::HostFn::call_v2
].
§Wasm Import Statement
(import "seal2" "call" (func ...))
sourcefn deposit_event(
topics_ptr: u32,
topics_len: u32,
data_ptr: u32,
data_len: u32,
) -> Result<(), TrapReason>
fn deposit_event( topics_ptr: u32, topics_len: u32, data_ptr: u32, data_len: u32, ) -> Result<(), TrapReason>
Deposit a contract event with the data buffer and optional list of topics. See [pallet_contracts_uapi::HostFn::deposit_event]
§Wasm Import Statement
(import "seal0" "deposit_event" (func ...))
sourcefn ecdsa_recover(
signature_ptr: u32,
message_hash_ptr: u32,
output_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn ecdsa_recover( signature_ptr: u32, message_hash_ptr: u32, output_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Recovers the ECDSA public key from the given message hash and signature.
See [pallet_contracts_uapi::HostFn::ecdsa_recover
].
§Wasm Import Statement
(import "seal0" "ecdsa_recover" (func ...))
sourcefn reentrance_count() -> Result<u32, TrapReason>
fn reentrance_count() -> Result<u32, TrapReason>
Returns the number of times the currently executing contract exists on the call stack in
addition to the calling instance.
See [pallet_contracts_uapi::HostFn::reentrance_count
].
§Wasm Import Statement
(import "seal0" "reentrance_count" (func ...))
§Unstable
This function is unstable and it is a subject to change (or removal) in the future. Do not deploy a contract using it to a production chain.
sourcefn caller(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn caller(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the address of the caller into the supplied buffer.
See [pallet_contracts_uapi::HostFn::caller
].
§Wasm Import Statement
(import "seal0" "caller" (func ...))
sourcefn xcm_send(
dest_ptr: u32,
msg_ptr: u32,
msg_len: u32,
output_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn xcm_send( dest_ptr: u32, msg_ptr: u32, msg_len: u32, output_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Send an XCM program from the contract to the specified destination.
See [pallet_contracts_uapi::HostFn::send_xcm
].
§Wasm Import Statement
(import "seal0" "xcm_send" (func ...))
sourcefn take_storage(
key_ptr: u32,
key_len: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn take_storage( key_ptr: u32, key_len: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Retrieve and remove the value under the given key from storage.
See [pallet_contracts_uapi::HostFn::take_storage
]
§Wasm Import Statement
(import "seal0" "take_storage" (func ...))
sourcefn is_contract(account_ptr: u32) -> Result<u32, TrapReason>
fn is_contract(account_ptr: u32) -> Result<u32, TrapReason>
Checks whether a specified address belongs to a contract.
See [pallet_contracts_uapi::HostFn::is_contract
].
§Wasm Import Statement
(import "seal0" "is_contract" (func ...))
sourcefn caller_is_root() -> Result<u32, TrapReason>
fn caller_is_root() -> Result<u32, TrapReason>
Checks whether the caller of the current contract is root.
See [pallet_contracts_uapi::HostFn::caller_is_root
].
§Wasm Import Statement
(import "seal0" "caller_is_root" (func ...))
sourcefn hash_keccak_256(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>
fn hash_keccak_256( input_ptr: u32, input_len: u32, output_ptr: u32, ) -> Result<(), TrapReason>
Computes the KECCAK 256-bit hash on the given input buffer.
See [pallet_contracts_uapi::HostFn::hash_keccak_256
].
§Wasm Import Statement
(import "seal0" "hash_keccak_256" (func ...))
sourcefn ecdsa_to_eth_address(
key_ptr: u32,
out_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn ecdsa_to_eth_address( key_ptr: u32, out_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Calculates Ethereum address from the ECDSA compressed public key and stores
See [pallet_contracts_uapi::HostFn::ecdsa_to_eth_address
].
§Wasm Import Statement
(import "seal0" "ecdsa_to_eth_address" (func ...))
sourcefn set_rent_allowance(_value_ptr: u32) -> Result<(), TrapReason>
fn set_rent_allowance(_value_ptr: u32) -> Result<(), TrapReason>
§Deprecated
This function is deprecated and will be removed in future versions. No new code or contracts with this API can be deployed. Was used to set rent allowance of the contract.
§Note
The state rent functionality was removed. This is stub only exists for backwards compatibility.
§Wasm Import Statement
(import "seal1" "set_rent_allowance" (func ...))
sourcefn hash_blake2_128(
input_ptr: u32,
input_len: u32,
output_ptr: u32,
) -> Result<(), TrapReason>
fn hash_blake2_128( input_ptr: u32, input_len: u32, output_ptr: u32, ) -> Result<(), TrapReason>
Computes the BLAKE2 128-bit hash on the given input buffer.
See [pallet_contracts_uapi::HostFn::hash_blake2_128
].
§Wasm Import Statement
(import "seal0" "hash_blake2_128" (func ...))
sourcefn contains_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>
fn contains_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>
Checks whether there is a value stored under the given key.
See [pallet_contracts_uapi::HostFn::contains_storage_v1
]
§Wasm Import Statement
(import "seal1" "contains_storage" (func ...))
sourcefn own_code_hash(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn own_code_hash(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Retrieve the code hash of the currently executing contract.
See [pallet_contracts_uapi::HostFn::own_code_hash
].
§Wasm Import Statement
(import "seal0" "own_code_hash" (func ...))
sourcefn weight_to_fee(
ref_time_limit: u64,
proof_size_limit: u64,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<(), TrapReason>
fn weight_to_fee( ref_time_limit: u64, proof_size_limit: u64, out_ptr: u32, out_len_ptr: u32, ) -> Result<(), TrapReason>
Stores the price for the specified amount of weight into the supplied buffer.
See [pallet_contracts_uapi::HostFn::weight_to_fee_v1
].
§Wasm Import Statement
(import "seal1" "weight_to_fee" (func ...))
§Unstable
This function is unstable and it is a subject to change (or removal) in the future. Do not deploy a contract using it to a production chain.
sourcefn input(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn input(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the input passed by the caller into the supplied buffer.
See [pallet_contracts_uapi::HostFn::input
].
§Wasm Import Statement
(import "seal0" "input" (func ...))
sourcefn terminate(beneficiary_ptr: u32) -> Result<(), TrapReason>
fn terminate(beneficiary_ptr: u32) -> Result<(), TrapReason>
Remove the calling account and transfer remaining free balance.
See [pallet_contracts_uapi::HostFn::terminate_v1
].
§Wasm Import Statement
(import "seal1" "terminate" (func ...))
sourcefn set_transient_storage(
key_ptr: u32,
key_len: u32,
value_ptr: u32,
value_len: u32,
) -> Result<u32, TrapReason>
fn set_transient_storage( key_ptr: u32, key_len: u32, value_ptr: u32, value_len: u32, ) -> Result<u32, TrapReason>
sourcefn delegate_call(
flags: u32,
code_hash_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn delegate_call( flags: u32, code_hash_ptr: u32, input_data_ptr: u32, input_data_len: u32, output_ptr: u32, output_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Execute code in the context (storage, caller, value) of the current contract.
See [pallet_contracts_uapi::HostFn::delegate_call
].
§Wasm Import Statement
(import "seal0" "delegate_call" (func ...))
sourcefn clear_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>
fn clear_storage(key_ptr: u32, key_len: u32) -> Result<u32, TrapReason>
Clear the value at the given key in the contract storage.
See [pallet_contracts_uapi::HostFn::clear_storage_v1
]
§Wasm Import Statement
(import "seal1" "clear_storage" (func ...))
sourcefn address(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn address(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the address of the current contract into the supplied buffer.
See [pallet_contracts_uapi::HostFn::address
].
§Wasm Import Statement
(import "seal0" "address" (func ...))
sourcefn now(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn now(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Load the latest block timestamp into the supplied buffer
See [pallet_contracts_uapi::HostFn::now
].
§Wasm Import Statement
(import "seal0" "now" (func ...))
sourcefn caller_is_origin() -> Result<u32, TrapReason>
fn caller_is_origin() -> Result<u32, TrapReason>
Checks whether the caller of the current contract is the origin of the whole call stack.
See [pallet_contracts_uapi::HostFn::caller_is_origin
].
§Wasm Import Statement
(import "seal0" "caller_is_origin" (func ...))
sourcefn transfer(
account_ptr: u32,
_account_len: u32,
value_ptr: u32,
_value_len: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn transfer( account_ptr: u32, _account_len: u32, value_ptr: u32, _value_len: u32, ) -> Result<ReturnErrorCode, TrapReason>
Transfer some value to another account.
See [pallet_contracts_uapi::HostFn::transfer
].
§Wasm Import Statement
(import "seal0" "transfer" (func ...))
sourcefn block_number(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
fn block_number(out_ptr: u32, out_len_ptr: u32) -> Result<(), TrapReason>
Stores the current block number of the current contract into the supplied buffer.
See [pallet_contracts_uapi::HostFn::block_number
].
§Wasm Import Statement
(import "seal0" "block_number" (func ...))
sourcefn code_hash(
account_ptr: u32,
out_ptr: u32,
out_len_ptr: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn code_hash( account_ptr: u32, out_ptr: u32, out_len_ptr: u32, ) -> Result<ReturnErrorCode, TrapReason>
Retrieve the code hash for a specified contract address.
See [pallet_contracts_uapi::HostFn::code_hash
].
§Wasm Import Statement
(import "seal0" "code_hash" (func ...))
sourcefn instantiate(
code_hash_ptr: u32,
ref_time_limit: u64,
proof_size_limit: u64,
deposit_ptr: u32,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
address_ptr: u32,
address_len_ptr: u32,
output_ptr: u32,
output_len_ptr: u32,
salt_ptr: u32,
salt_len: u32,
) -> Result<ReturnErrorCode, TrapReason>
fn instantiate( code_hash_ptr: u32, ref_time_limit: u64, proof_size_limit: u64, deposit_ptr: u32, value_ptr: u32, input_data_ptr: u32, input_data_len: u32, address_ptr: u32, address_len_ptr: u32, output_ptr: u32, output_len_ptr: u32, salt_ptr: u32, salt_len: u32, ) -> Result<ReturnErrorCode, TrapReason>
Instantiate a contract with the specified code hash.
See [pallet_contracts_uapi::HostFn::instantiate_v2
].
§Wasm Import Statement
(import "seal2" "instantiate" (func ...))
sourcefn set_storage(
key_ptr: u32,
key_len: u32,
value_ptr: u32,
value_len: u32,
) -> Result<u32, TrapReason>
fn set_storage( key_ptr: u32, key_len: u32, value_ptr: u32, value_len: u32, ) -> Result<u32, TrapReason>
Set the value at the given key in the contract storage.
See [pallet_contracts_uapi::HostFn::set_storage_v2
]
§Wasm Import Statement
(import "seal2" "set_storage" (func ...))