Struct frame_support::weights::WeightMeter
source · pub struct WeightMeter { /* private fields */ }
Expand description
Meters consumed weight and a hard limit for the maximal consumable weight.
Can be used to check if enough weight for an operation is available before committing to it.
§Example
use sp_weights::{Weight, WeightMeter};
// The weight is limited to (10, 0).
let mut meter = WeightMeter::with_limit(Weight::from_parts(10, 0));
// There is enough weight remaining for an operation with (6, 0) weight.
assert!(meter.try_consume(Weight::from_parts(6, 0)).is_ok());
assert_eq!(meter.remaining(), Weight::from_parts(4, 0));
// There is not enough weight remaining for an operation with (5, 0) weight.
assert!(!meter.try_consume(Weight::from_parts(5, 0)).is_ok());
// The total limit is obviously unchanged:
assert_eq!(meter.limit(), Weight::from_parts(10, 0));
Implementations§
source§impl WeightMeter
impl WeightMeter
sourcepub fn with_limit(limit: Weight) -> WeightMeter
pub fn with_limit(limit: Weight) -> WeightMeter
Creates Self
from a limit for the maximal consumable weight.
sourcepub fn new() -> WeightMeter
pub fn new() -> WeightMeter
Creates Self
with the maximal possible limit for the consumable weight.
sourcepub fn consumed_ratio(&self) -> Perbill
pub fn consumed_ratio(&self) -> Perbill
The ratio of consumed weight to the limit.
Calculates one ratio per component and returns the largest.
§Example
use sp_weights::{Weight, WeightMeter};
use sp_arithmetic::Perbill;
let mut meter = WeightMeter::with_limit(Weight::from_parts(10, 20));
// Nothing consumed so far:
assert_eq!(meter.consumed_ratio(), Perbill::from_percent(0));
meter.consume(Weight::from_parts(5, 5));
// The ref-time is the larger ratio:
assert_eq!(meter.consumed_ratio(), Perbill::from_percent(50));
meter.consume(Weight::from_parts(1, 10));
// Now the larger ratio is proof-size:
assert_eq!(meter.consumed_ratio(), Perbill::from_percent(75));
// Eventually it reaches 100%:
meter.consume(Weight::from_parts(4, 0));
assert_eq!(meter.consumed_ratio(), Perbill::from_percent(100));
// Saturating the second component won't change anything anymore:
meter.consume(Weight::from_parts(0, 5));
assert_eq!(meter.consumed_ratio(), Perbill::from_percent(100));
sourcepub fn defensive_saturating_accrue(&mut self, w: Weight)
👎Deprecated: Use consume
instead. Will be removed after December 2023.
pub fn defensive_saturating_accrue(&mut self, w: Weight)
consume
instead. Will be removed after December 2023.Consume some weight and defensively fail if it is over the limit. Saturate in any case.
sourcepub fn consume(&mut self, w: Weight)
pub fn consume(&mut self, w: Weight)
Consume some weight and defensively fail if it is over the limit. Saturate in any case.
sourcepub fn try_consume(&mut self, w: Weight) -> Result<(), ()>
pub fn try_consume(&mut self, w: Weight) -> Result<(), ()>
Consume the given weight after checking that it can be consumed.
Returns Ok
if the weight can be consumed or otherwise an Err
.
sourcepub fn can_consume(&self, w: Weight) -> bool
pub fn can_consume(&self, w: Weight) -> bool
Check if the given weight can be consumed.
sourcepub fn reclaim_proof_size(&mut self, s: u64)
pub fn reclaim_proof_size(&mut self, s: u64)
Reclaim the given weight.
Trait Implementations§
source§impl Clone for WeightMeter
impl Clone for WeightMeter
source§fn clone(&self) -> WeightMeter
fn clone(&self) -> WeightMeter
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreAuto Trait Implementations§
impl RefUnwindSafe for WeightMeter
impl Send for WeightMeter
impl Sync for WeightMeter
impl Unpin for WeightMeter
impl UnwindSafe for WeightMeter
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