pub struct BasicConstantFeePolicy { /* private fields */ }Expand description
The basic_constant_fee fee policy account component.
This is a simple baseline constant fee policy: the fee depends only on the note’s script root.
More sophisticated constant fee policies can be derived from it by swapping the lookup-key
computation of its compute_note_fee procedure, which yields a policy with a new root. A
derived policy must also rename its fee_schedule storage slot, since two components
installed on the same account cannot share a slot name.
Register with a crate::account::fees::FeePolicyManager, whose allowed fee-policies map then
includes BasicConstantFeePolicy::root. When active, estimate_note_fee dispatches to this
policy’s compute_note_fee procedure, which returns the fee as a fee asset (asset ID and
value words): the amount is looked up in the fee schedule under the note’s script root
(recovered from the note’s recipient via the advice provider), and note scripts without a
schedule entry abort fee estimation. To make a note script free, schedule an explicit 0 fee
for it via BasicConstantFeePolicy::with_fee. The remaining note parameters, including the
timeframe and priority, are ignored by this policy. The fee asset ID is read from the
fee-policy storage, so the fee is always charged in the configured asset and the policy
requires an AuthNetworkAccount component on the
same account.
§Storage layout
Self::fee_schedule_slot_namemap slot:NOTE_SCRIPT_ROOT => [fee_amount, 0, 0, 1], where the last element is a set-marker distinguishing scheduled entries from unset keys.
Implementations§
Source§impl BasicConstantFeePolicy
impl BasicConstantFeePolicy
Sourcepub const NAME: &'static str = "miden::standards::fees::policies::basic_constant_fee"
pub const NAME: &'static str = "miden::standards::fees::policies::basic_constant_fee"
The name of the component.
Sourcepub const fn name() -> AccountComponentName
pub const fn name() -> AccountComponentName
Returns the canonical AccountComponentName of this component.
Sourcepub fn new() -> BasicConstantFeePolicy
pub fn new() -> BasicConstantFeePolicy
Creates a new basic_constant_fee fee policy with an empty fee schedule, charging fees in
the fungible asset its crate::account::fees::FeePolicyManager is configured with.
Sourcepub fn with_fee(
self,
script_root: NoteScriptRoot,
fee: AssetAmount,
) -> BasicConstantFeePolicy
pub fn with_fee( self, script_root: NoteScriptRoot, fee: AssetAmount, ) -> BasicConstantFeePolicy
Sets the fee for notes with the given script root, replacing any previous entry.
The schedule stores bare amounts: the fee must be denominated in the fee asset of the
FeePolicyManager this policy is registered
with, which is the asset the policy charges it in.
Scheduling an explicit fee of 0 makes notes with this script root free; script roots without a schedule entry abort fee estimation.
Sourcepub fn with_fees(
self,
entries: impl IntoIterator<Item = (NoteScriptRoot, AssetAmount)>,
) -> BasicConstantFeePolicy
pub fn with_fees( self, entries: impl IntoIterator<Item = (NoteScriptRoot, AssetAmount)>, ) -> BasicConstantFeePolicy
Extends the fee schedule with the given (script_root, fee) entries, replacing any
previous entries. See Self::with_fee for the fee denomination requirement.
Sourcepub fn code() -> &'static AccountComponentCode
pub fn code() -> &'static AccountComponentCode
Returns the AccountComponentCode of this component.
Sourcepub fn root() -> AccountProcedureRoot
pub fn root() -> AccountProcedureRoot
Returns the procedure root of the compute_note_fee fee policy procedure.
Sourcepub fn fee_schedule_slot_name() -> &'static StorageSlotName
pub fn fee_schedule_slot_name() -> &'static StorageSlotName
Returns the StorageSlotName of the slot holding the fee schedule map.
Sourcepub fn fee_schedule(&self) -> &BTreeMap<NoteScriptRoot, AssetAmount>
pub fn fee_schedule(&self) -> &BTreeMap<NoteScriptRoot, AssetAmount>
Returns the fee charged per note script root.
Sourcepub fn component_metadata() -> AccountComponentMetadata
pub fn component_metadata() -> AccountComponentMetadata
Returns the AccountComponentMetadata for this component.
Trait Implementations§
Source§impl Clone for BasicConstantFeePolicy
impl Clone for BasicConstantFeePolicy
Source§fn clone(&self) -> BasicConstantFeePolicy
fn clone(&self) -> BasicConstantFeePolicy
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreSource§impl Debug for BasicConstantFeePolicy
impl Debug for BasicConstantFeePolicy
Source§impl Default for BasicConstantFeePolicy
impl Default for BasicConstantFeePolicy
Source§fn default() -> BasicConstantFeePolicy
fn default() -> BasicConstantFeePolicy
Source§impl From<BasicConstantFeePolicy> for AccountComponent
impl From<BasicConstantFeePolicy> for AccountComponent
Source§fn from(policy: BasicConstantFeePolicy) -> AccountComponent
fn from(policy: BasicConstantFeePolicy) -> AccountComponent
Source§impl From<BasicConstantFeePolicy> for FeePolicy
impl From<BasicConstantFeePolicy> for FeePolicy
Source§fn from(policy: BasicConstantFeePolicy) -> FeePolicy
fn from(policy: BasicConstantFeePolicy) -> FeePolicy
Returns a fee policy charging the constant fee scheduled for the note’s script root.
Auto Trait Implementations§
impl Freeze for BasicConstantFeePolicy
impl RefUnwindSafe for BasicConstantFeePolicy
impl Send for BasicConstantFeePolicy
impl Sync for BasicConstantFeePolicy
impl Unpin for BasicConstantFeePolicy
impl UnsafeUnpin for BasicConstantFeePolicy
impl UnwindSafe for BasicConstantFeePolicy
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