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let result = ctx.ext.transfer(&callee, value);
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match result {
Ok(()) => Ok(ReturnCode::Success),
Err(err) => {
let code = Runtime::<E>::err_into_return_code(err)?;
Ok(code)
}
}
// Make a call to another contract.
//
// # Deprecation
//
// This is equivalent to calling the newer version of this function with
// `flags` set to `ALLOW_REENTRY`. See the newer version for documentation.
//
// # Note
//
// The values `_callee_len` and `_value_len` are ignored because the encoded sizes
// of those types are fixed through `[`MaxEncodedLen`]. The fields exist for backwards
// compatibility. Consider switching to the newest version of this function.
[seal0] seal_call(
ctx,
callee_ptr: u32,
gas: u64,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32
) -> ReturnCode => {
ctx.call(
CallFlags::ALLOW_REENTRY,
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CallType::Call{callee_ptr, value_ptr, gas},
input_data_ptr,
input_data_len,
output_ptr,
output_len_ptr,
)
},
// The callees output buffer is copied to `output_ptr` and its length to `output_len_ptr`.
// The copy of the output buffer can be skipped by supplying the sentinel value
// of `SENTINEL` to `output_ptr`.
//
// - flags: See [`CallFlags`] for a documenation of the supported flags.
// - callee_ptr: a pointer to the address of the callee contract.
// Should be decodable as an `T::AccountId`. Traps otherwise.
// - gas: how much gas to devote to the execution.
// - value_ptr: a pointer to the buffer with value, how much value to send.
// Should be decodable as a `T::Balance`. Traps otherwise.
// - input_data_ptr: a pointer to a buffer to be used as input data to the callee.
// - input_data_len: length of the input data buffer.
// - output_ptr: a pointer where the output buffer is copied to.
// - output_len_ptr: in-out pointer to where the length of the buffer is read from
// and the actual length is written to.
//
// # Errors
//
// An error means that the call wasn't successful output buffer is returned unless
// stated otherwise.
// `ReturnCode::CalleeReverted`: Output buffer is returned.
// `ReturnCode::CalleeTrapped`
// `ReturnCode::TransferFailed`
// `ReturnCode::NotCallable`
flags: u32,
callee_ptr: u32,
gas: u64,
value_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32
) -> ReturnCode => {
ctx.call(
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CallFlags::from_bits(flags).ok_or_else(|| Error::<E::T>::InvalidCallFlags)?,
CallType::Call{callee_ptr, value_ptr, gas},
input_data_ptr,
input_data_len,
output_ptr,
output_len_ptr,
)
},
// Execute code in the context (storage, caller, value) of the current contract.
//
// Reentrancy protection is always disabled since the callee is allowed
// to modify the callers storage. This makes going through a reentrancy attack
// unnecessary for the callee when it wants to exploit the caller.
//
// # Parameters
//
// - flags: See [`CallFlags`] for a documentation of the supported flags.
// - code_hash: a pointer to the hash of the code to be called.
// - input_data_ptr: a pointer to a buffer to be used as input data to the callee.
// - input_data_len: length of the input data buffer.
// - output_ptr: a pointer where the output buffer is copied to.
// - output_len_ptr: in-out pointer to where the length of the buffer is read from
// and the actual length is written to.
//
// # Errors
//
// An error means that the call wasn't successful and no output buffer is returned unless
// stated otherwise.
//
// `ReturnCode::CalleeReverted`: Output buffer is returned.
// `ReturnCode::CalleeTrapped`
// `ReturnCode::CodeNotFound`
[__unstable__] seal_delegate_call(
ctx,
flags: u32,
code_hash_ptr: u32,
input_data_ptr: u32,
input_data_len: u32,
output_ptr: u32,
output_len_ptr: u32
) -> ReturnCode => {
ctx.call(
CallFlags::from_bits(flags).ok_or_else(|| Error::<E::T>::InvalidCallFlags)?,
CallType::DelegateCall{code_hash_ptr},
input_data_ptr,
input_data_len,
output_ptr,
output_len_ptr,
)
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// Instantiate a contract with the specified code hash.
//
// # Deprecation
//
// This is equivalent to calling the newer version of this function. The newer version
// drops the now unnecessary length fields.
//
// # Note
//
// The values `_code_hash_len` and `_value_len` are ignored because the encoded sizes
// of those types are fixed through `[`MaxEncodedLen`]. The fields exist for backwards
// compatibility. Consider switching to the newest version of this function.
[seal0] seal_instantiate(
ctx,
code_hash_ptr: u32,
_code_hash_len: u32,
gas: u64,
value_ptr: u32,
_value_len: 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
) -> ReturnCode => {
ctx.instantiate (
code_hash_ptr,
gas,
value_ptr,
input_data_ptr,
input_data_len,
address_ptr,
address_len_ptr,
output_ptr,
output_len_ptr,
salt_ptr,
salt_len,
)
},
// Instantiate a contract with the specified code hash.
// This function creates an account and executes the constructor defined in the code specified
// by the code hash. The address of this new account is copied to `address_ptr` and its length
// to `address_len_ptr`. The constructors output buffer is copied to `output_ptr` and its
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// length to `output_len_ptr`. The copy of the output buffer and address can be skipped by
// supplying the sentinel value of `SENTINEL` to `output_ptr` or `address_ptr`.
//
// `value` must be at least the minimum balance. Otherwise the instantiation fails and the
// contract is not created.
// - code_hash_ptr: a pointer to the buffer that contains the initializer code.
// - gas: how much gas to devote to the execution of the initializer code.
// - value_ptr: a pointer to the buffer with value, how much value to send.
// Should be decodable as a `T::Balance`. Traps otherwise.
// - input_data_ptr: a pointer to a buffer to be used as input data to the initializer code.
// - input_data_len: length of the input data buffer.
// - address_ptr: a pointer where the new account's address is copied to.
// - address_len_ptr: in-out pointer to where the length of the buffer is read from
// and the actual length is written to.
// - output_ptr: a pointer where the output buffer is copied to.
// - output_len_ptr: in-out pointer to where the length of the buffer is read from
// and the actual length is written to.
// - salt_ptr: Pointer to raw bytes used for address derivation. See `fn contract_address`.
// - salt_len: length in bytes of the supplied salt.
// Please consult the `ReturnCode` enum declaration for more information on those
// errors. Here we only note things specific to this function.
// An error means that the account wasn't created and no address or output buffer
// is returned unless stated otherwise.
// `ReturnCode::CalleeReverted`: Output buffer is returned.
// `ReturnCode::CalleeTrapped`
// `ReturnCode::TransferFailed`
// `ReturnCode::CodeNotFound`
[seal1] seal_instantiate(
gas: u64,
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
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ctx.instantiate(
code_hash_ptr,
gas,
value_ptr,
input_data_ptr,
input_data_len,
address_ptr,
address_len_ptr,
output_ptr,
output_len_ptr,
salt_ptr,
salt_len,
)
},
// Remove the calling account and transfer remaining balance.
//
// # Deprecation
//
// This is equivalent to calling the newer version of this function. The newer version
// drops the now unnecessary length fields.
//
// # Note
//
// The value `_beneficiary_len` is ignored because the encoded sizes
// this type is fixed through `[`MaxEncodedLen`]. The field exist for backwards
// compatibility. Consider switching to the newest version of this function.
[seal0] seal_terminate(ctx, beneficiary_ptr: u32, _beneficiary_len: u32) => {
ctx.terminate(beneficiary_ptr)
// Remove the calling account and transfer remaining **free** balance.
//
// This function never returns. Either the termination was successful and the
// execution of the destroyed contract is halted. Or it failed during the termination
// which is considered fatal and results in a trap + rollback.
//
// - beneficiary_ptr: a pointer to the address of the beneficiary account where all
// where all remaining funds of the caller are transferred.
// Should be decodable as an `T::AccountId`. Traps otherwise.
//
// # Traps
//
// - The contract is live i.e is already on the call stack.
// - Failed to send the balance to the beneficiary.
// - The deletion queue is full.
[seal1] seal_terminate(ctx, beneficiary_ptr: u32) => {
ctx.terminate(beneficiary_ptr)
// Stores the input passed by the caller 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
//
// This function traps if the input was previously forwarded by a `seal_call`.
[seal0] seal_input(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::InputBase)?;
if let Some(input) = ctx.input_data.take() {
ctx.write_sandbox_output(out_ptr, out_len_ptr, &input, false, |len| {
Some(RuntimeCosts::InputCopyOut(len))
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})?;
ctx.input_data = Some(input);
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Ok(())
Err(Error::<E::T>::InputForwarded.into())
}
},
// Cease contract execution and save a data buffer as a result of the execution.
//
// This function never returns as it stops execution of the caller.
// This is the only way to return a data buffer to the caller. Returning from
// execution without calling this function is equivalent to calling:
// ```
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// seal_return(0, 0, 0);
// The flags argument is a bitfield that can be used to signal special return
// conditions to the supervisor:
// --- lsb ---
// bit 0 : REVERT - Revert all storage changes made by the caller.
// bit [1, 31]: Reserved for future use.
// --- msb ---
//
// Using a reserved bit triggers a trap.
[seal0] seal_return(ctx, flags: u32, data_ptr: u32, data_len: u32) => {
ctx.charge_gas(RuntimeCosts::Return(data_len))?;
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Err(TrapReason::Return(ReturnData {
data: ctx.read_sandbox_memory(data_ptr, data_len)?,
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}))
// Stores the address of the caller 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.
// If this is a top-level call (i.e. initiated by an extrinsic) the origin address of the
// extrinsic will be returned. Otherwise, if this call is initiated by another contract then the
// address of the contract will be returned. The value is encoded as T::AccountId.
[seal0] seal_caller(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Caller)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.caller().encode(), false, already_charged
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)?)
},
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// Checks whether a specified address belongs to a contract.
//
// # Parameters
//
// - account_ptr: a pointer to the address of the beneficiary account
// Should be decodable as an `T::AccountId`. Traps otherwise.
//
// Returned value is a u32-encoded boolean: (0 = false, 1 = true).
[__unstable__] seal_is_contract(ctx, account_ptr: u32) -> u32 => {
ctx.charge_gas(RuntimeCosts::IsContract)?;
let address: <<E as Ext>::T as frame_system::Config>::AccountId =
ctx.read_sandbox_memory_as(account_ptr)?;
Ok(ctx.ext.is_contract(&address) as u32)
},
// Checks whether the caller of the current contract is the origin of the whole call stack.
//
// Prefer this over `seal_is_contract` when checking whether your contract is being called by a contract
// or a plain account. The reason is that it performs better since it does not need to
// do any storage lookups.
//
// A return value of`true` indicates that this contract is being called by a plain account
// and `false` indicates that the caller is another contract.
//
// Returned value is a u32-encoded boolean: (0 = false, 1 = true).
[__unstable__] seal_caller_is_origin(ctx) -> u32 => {
ctx.charge_gas(RuntimeCosts::CallerIsOrigin)?;
Ok(ctx.ext.caller_is_origin() as u32)
},
// Stores the address of the current contract 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.
[seal0] seal_address(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Address)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.address().encode(), false, already_charged
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)?)
// Stores the price for the specified amount of gas 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::Balance.
//
// # Note
// It is recommended to avoid specifying very small values for `gas` as the prices for a single
// gas can be smaller than one.
[seal0] seal_weight_to_fee(ctx, gas: u64, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::WeightToFee)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.get_weight_price(gas).encode(), false, already_charged
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)?)
// Stores the amount of gas left 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 Gas.
[seal0] seal_gas_left(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::GasLeft)?;
let gas_left = &ctx.ext.gas_meter().gas_left().encode();
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &gas_left, false, already_charged,
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)?)
// Stores the **free* balance of the current account 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::Balance.
[seal0] seal_balance(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Balance)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.balance().encode(), false, already_charged
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)?)
// Stores the value transferred along with this call/instantiate 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::Balance.
[seal0] seal_value_transferred(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::ValueTransferred)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.value_transferred().encode(), false, already_charged
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)?)
// 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.
//
// # Deprecation
//
// This function is deprecated. Users should migrate to the version in the "seal1" module.
[seal0] seal_random(ctx, subject_ptr: u32, subject_len: u32, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Random)?;
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if subject_len > ctx.ext.schedule().limits.subject_len {
Err(Error::<E::T>::RandomSubjectTooLong)?;
}
let subject_buf = ctx.read_sandbox_memory(subject_ptr, subject_len)?;
Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.random(&subject_buf).0.encode(), false, already_charged
)?)
},
// 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, T::BlockNumber).
//
// # 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.
[seal1] seal_random(ctx, subject_ptr: u32, subject_len: u32, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Random)?;
if subject_len > ctx.ext.schedule().limits.subject_len {
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Err(Error::<E::T>::RandomSubjectTooLong)?;
let subject_buf = ctx.read_sandbox_memory(subject_ptr, subject_len)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.random(&subject_buf).encode(), false, already_charged
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)?)
},
// Load the latest block timestamp 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.
[seal0] seal_now(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Now)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.now().encode(), false, already_charged
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)?)
},
// Stores the minimum balance (a.k.a. existential deposit) into the supplied buffer.
// The data is encoded as T::Balance.
[seal0] seal_minimum_balance(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::MinimumBalance)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.minimum_balance().encode(), false, already_charged
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)?)
// 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.
// There is no longer a tombstone deposit. This function always returns 0.
[seal0] seal_tombstone_deposit(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Balance)?;
let deposit = <BalanceOf<E::T>>::zero().encode();
Ok(ctx.write_sandbox_output(out_ptr, out_len_ptr, &deposit, false, already_charged)?)
// 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 compatiblity
[seal0] seal_restore_to(
ctx,
_rent_allowance_len: u32,
_delta_ptr: u32,
_delta_count: u32
ctx.charge_gas(RuntimeCosts::DebugMessage)?;
Ok(())
// Was used to restore the given destination contract sacrificing the caller.
// The state rent functionality was removed. This is stub only exists for
// backwards compatiblity
[seal1] seal_restore_to(
_dest_ptr: u32,
_code_hash_ptr: u32,
_rent_allowance_ptr: u32,
_delta_ptr: u32,
_delta_count: u32
ctx.charge_gas(RuntimeCosts::DebugMessage)?;
Ok(())
// Deposit a contract event with the data buffer and optional list of topics. There is a limit
// on the maximum number of topics specified by `event_topics`.
//
// - topics_ptr - a pointer to the buffer of topics encoded as `Vec<T::Hash>`. The value of this
// is ignored if `topics_len` is set to 0. The topics list can't contain duplicates.
// - topics_len - the length of the topics buffer. Pass 0 if you want to pass an empty vector.
// - data_ptr - a pointer to a raw data buffer which will saved along the event.
// - data_len - the length of the data buffer.
[seal0] seal_deposit_event(
ctx,
topics_ptr: u32,
topics_len: u32,
data_ptr: u32,
data_len: u32
) => {
fn has_duplicates<T: Ord>(items: &mut Vec<T>) -> bool {
// # Warning
//
// Unstable sorts are non-deterministic across architectures. The usage here is OK
// because we are rejecting duplicates which removes the non determinism.
items.sort_unstable();
// Find any two consecutive equal elements.
items.windows(2).any(|w| {
match &w {
&[a, b] => a == b,
_ => false,
}
})
}
let num_topic = topics_len
.checked_div(sp_std::mem::size_of::<TopicOf<E::T>>() as u32)
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.ok_or_else(|| "Zero sized topics are not allowed")?;
ctx.charge_gas(RuntimeCosts::DepositEvent {
num_topic,
len: data_len,
})?;
if data_len > ctx.ext.max_value_size() {
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Err(Error::<E::T>::ValueTooLarge)?;
let mut topics: Vec::<TopicOf<<E as Ext>::T>> = match topics_len {
_ => ctx.read_sandbox_memory_as_unbounded(topics_ptr, topics_len)?,
// If there are more than `event_topics`, then trap.
if topics.len() > ctx.ext.schedule().limits.event_topics as usize {
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Err(Error::<E::T>::TooManyTopics)?;
}
// Check for duplicate topics. If there are any, then trap.
// Complexity O(n * log(n)) and no additional allocations.
// This also sorts the topics.
if has_duplicates(&mut topics) {
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Err(Error::<E::T>::DuplicateTopics)?;
let event_data = ctx.read_sandbox_memory(data_ptr, data_len)?;
ctx.ext.deposit_event(topics, event_data);
// Was used to set rent allowance of the contract.
//
// # Note
//
// The state rent functionality was removed. This is stub only exists for
// backwards compatiblity.
[seal0] seal_set_rent_allowance(ctx, _value_ptr: u32, _value_len: u32) => {
ctx.charge_gas(RuntimeCosts::DebugMessage)?;
// Was used to set rent allowance of the contract.
// # Note
//
// The state rent functionality was removed. This is stub only exists for
// backwards compatiblity.
[seal1] seal_set_rent_allowance(ctx, _value_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::DebugMessage)?;
// Was used to store the rent allowance into the supplied buffer.
// The state rent functionality was removed. This is stub only exists for
// backwards compatiblity.
[seal0] seal_rent_allowance(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::Balance)?;
let rent_allowance = <BalanceOf<E::T>>::max_value().encode();
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &rent_allowance, false, already_charged
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)?)
// Stores the current block number of the current contract 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.
[seal0] seal_block_number(ctx, out_ptr: u32, out_len_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::BlockNumber)?;
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Ok(ctx.write_sandbox_output(
out_ptr, out_len_ptr, &ctx.ext.block_number().encode(), false, already_charged
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)?)
// Computes the SHA2 256-bit hash on the given input buffer.
//
// Returns the result directly into the given output buffer.
//
// # Note
//
// - The `input` and `output` buffer may overlap.
// - The output buffer is expected to hold at least 32 bytes (256 bits).
// - It is the callers responsibility to provide an output buffer that
// is large enough to hold the expected amount of bytes returned by the
// chosen hash function.
//
// # Parameters
//
// - `input_ptr`: the pointer into the linear memory where the input
// data is placed.
// - `input_len`: the length of the input data in bytes.
// - `output_ptr`: the pointer into the linear memory where the output
// data is placed. The function will write the result
// directly into this buffer.
[seal0] seal_hash_sha2_256(ctx, input_ptr: u32, input_len: u32, output_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::HashSha256(input_len))?;
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Ok(ctx.compute_hash_on_intermediate_buffer(sha2_256, input_ptr, input_len, output_ptr)?)
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},
// Computes the KECCAK 256-bit hash on the given input buffer.
//
// Returns the result directly into the given output buffer.
//
// # Note
//
// - The `input` and `output` buffer may overlap.
// - The output buffer is expected to hold at least 32 bytes (256 bits).
// - It is the callers responsibility to provide an output buffer that
// is large enough to hold the expected amount of bytes returned by the
// chosen hash function.
//
// # Parameters
//
// - `input_ptr`: the pointer into the linear memory where the input
// data is placed.
// - `input_len`: the length of the input data in bytes.
// - `output_ptr`: the pointer into the linear memory where the output
// data is placed. The function will write the result
// directly into this buffer.
[seal0] seal_hash_keccak_256(ctx, input_ptr: u32, input_len: u32, output_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::HashKeccak256(input_len))?;
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Ok(ctx.compute_hash_on_intermediate_buffer(keccak_256, input_ptr, input_len, output_ptr)?)
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},
// Computes the BLAKE2 256-bit hash on the given input buffer.
//
// Returns the result directly into the given output buffer.
//
// # Note
//
// - The `input` and `output` buffer may overlap.
// - The output buffer is expected to hold at least 32 bytes (256 bits).
// - It is the callers responsibility to provide an output buffer that
// is large enough to hold the expected amount of bytes returned by the
// chosen hash function.
//
// # Parameters
//
// - `input_ptr`: the pointer into the linear memory where the input
// data is placed.
// - `input_len`: the length of the input data in bytes.
// - `output_ptr`: the pointer into the linear memory where the output
// data is placed. The function will write the result
// directly into this buffer.
[seal0] seal_hash_blake2_256(ctx, input_ptr: u32, input_len: u32, output_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::HashBlake256(input_len))?;
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Ok(ctx.compute_hash_on_intermediate_buffer(blake2_256, input_ptr, input_len, output_ptr)?)
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},
// Computes the BLAKE2 128-bit hash on the given input buffer.
//
// Returns the result directly into the given output buffer.
//
// # Note
//
// - The `input` and `output` buffer may overlap.
// - The output buffer is expected to hold at least 16 bytes (128 bits).
// - It is the callers responsibility to provide an output buffer that
// is large enough to hold the expected amount of bytes returned by the
// chosen hash function.
//
// # Parameters
//
// - `input_ptr`: the pointer into the linear memory where the input
// data is placed.
// - `input_len`: the length of the input data in bytes.
// - `output_ptr`: the pointer into the linear memory where the output
// data is placed. The function will write the result
// directly into this buffer.
[seal0] seal_hash_blake2_128(ctx, input_ptr: u32, input_len: u32, output_ptr: u32) => {
ctx.charge_gas(RuntimeCosts::HashBlake128(input_len))?;
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Ok(ctx.compute_hash_on_intermediate_buffer(blake2_128, input_ptr, input_len, output_ptr)?)
// Call into the chain extension provided by the chain if any.
//
// Handling of the input values is up to the specific chain extension and so is the
// return value. The extension can decide to use the inputs as primitive inputs or as
// in/out arguments by interpreting them as pointers. Any caller of this function
// must therefore coordinate with the chain that it targets.
//
// # Note
//
// If no chain extension exists the contract will trap with the `NoChainExtension`
// module error.
[seal0] seal_call_chain_extension(
ctx,
func_id: u32,
input_ptr: u32,
input_len: u32,
output_ptr: u32,
output_len_ptr: u32
) -> u32 => {
use crate::chain_extension::{ChainExtension, Environment, RetVal};
if !<E::T as Config>::ChainExtension::enabled() {
Err(Error::<E::T>::NoChainExtension)?;
}
let env = Environment::new(ctx, input_ptr, input_len, output_ptr, output_len_ptr);
match <E::T as Config>::ChainExtension::call(func_id, env)? {
RetVal::Converging(val) => Ok(val),
RetVal::Diverging{flags, data} => Err(TrapReason::Return(ReturnData {
flags: flags.bits(),
data,
})),
}
},
// Emit a custom debug message.
//
// No newlines are added to the supplied message.
// Specifying invalid UTF-8 triggers a 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.
[seal0] seal_debug_message(ctx, str_ptr: u32, str_len: u32) -> ReturnCode => {
ctx.charge_gas(RuntimeCosts::DebugMessage)?;
if ctx.ext.append_debug_buffer("") {
let data = ctx.read_sandbox_memory(str_ptr, str_len)?;
let msg = core::str::from_utf8(&data)
.map_err(|_| <Error<E::T>>::DebugMessageInvalidUTF8)?;
ctx.ext.append_debug_buffer(msg);
return Ok(ReturnCode::Success);
}
Ok(ReturnCode::LoggingDisabled)
},
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// Call some dispatchable of the runtime.
//
// This function decodes the passed in data as the overarching `Call` type of the
// runtime and dispatches it. The weight as specified in the runtime is charged
// from the gas meter. Any weight refunds made by the dispatchable are considered.
//
// The filter specified by `Config::CallFilter` is attached to the origin of
// the dispatched call.
//
// # Parameters
//
// - `input_ptr`: the pointer into the linear memory where the input data is placed.
// - `input_len`: the length of the input data in bytes.
//
// # Return Value
//
// Returns `ReturnCode::Success` when the dispatchable was succesfully executed and
// returned `Ok`. When the dispatchable was exeuted but returned an error
// `ReturnCode::CallRuntimeReturnedError` is returned. The full error is not
// provided because it is not guaranteed to be stable.
//
// # Comparison with `ChainExtension`
//
// Just as a chain extension this API allows the runtime to extend the functionality
// of contracts. While making use of this function is generelly easier it cannot be
// used in call cases. Consider writing a chain extension if you need to do perform
// one of the following tasks:
//
// - Return data.
// - Provide functionality **exclusively** to contracts.
// - Provide custom weights.
// - Avoid the need to keep the `Call` data structure stable.
//
// # Unstable
//
// This function is unstable and subject to change (or removal) in the future. Do not
// deploy a contract using it to a production chain.
[__unstable__] seal_call_runtime(ctx, call_ptr: u32, call_len: u32) -> ReturnCode => {
use frame_support::{dispatch::GetDispatchInfo, weights::extract_actual_weight};
ctx.charge_gas(RuntimeCosts::CopyIn(call_len))?;
let call: <E::T as Config>::Call = ctx.read_sandbox_memory_as_unbounded(
call_ptr, call_len
)?;
let dispatch_info = call.get_dispatch_info();
let charged = ctx.charge_gas(RuntimeCosts::CallRuntime(dispatch_info.weight))?;
let result = ctx.ext.call_runtime(call);
let actual_weight = extract_actual_weight(&result, &dispatch_info);
ctx.adjust_gas(charged, RuntimeCosts::CallRuntime(actual_weight));
match result {
Ok(_) => Ok(ReturnCode::Success),
Err(_) => Ok(ReturnCode::CallRuntimeReturnedError),
}
},
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// Recovers the ECDSA public key from the given message hash and signature.
//
// Writes the public key into the given output buffer.
// Assumes the secp256k1 curve.
//
// # Parameters
//
// - `signature_ptr`: the pointer into the linear memory where the signature
// is placed. Should be decodable as a 65 bytes. Traps otherwise.
// - `message_hash_ptr`: the pointer into the linear memory where the message
// hash is placed. Should be decodable as a 32 bytes. Traps otherwise.
// - `output_ptr`: the pointer into the linear memory where the output
// data is placed. The buffer should be 33 bytes. Traps otherwise.
// The function will write the result directly into this buffer.
//
// # Errors
//
// `ReturnCode::EcdsaRecoverFailed`
[__unstable__] seal_ecdsa_recover(ctx, signature_ptr: u32, message_hash_ptr: u32, output_ptr: u32) -> ReturnCode => {
ctx.charge_gas(RuntimeCosts::EcdsaRecovery)?;
let mut signature: [u8; 65] = [0; 65];
ctx.read_sandbox_memory_into_buf(signature_ptr, &mut signature)?;
let mut message_hash: [u8; 32] = [0; 32];
ctx.read_sandbox_memory_into_buf(message_hash_ptr, &mut message_hash)?;
let result = ctx.ext.ecdsa_recover(&signature, &message_hash);
match result {
Ok(pub_key) => {
// Write the recovered compressed ecdsa public key back into the sandboxed output
// buffer.
ctx.write_sandbox_memory(output_ptr, pub_key.as_ref())?;
Ok(ReturnCode::Success)
},
Err(_) => Ok(ReturnCode::EcdsaRecoverFailed),
}
},