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package memlimit
import (
"fmt"
)
// Provider is a function that returns the memory limit.
type Provider func() (uint64, error)
// Limit is a helper Provider function that returns the given limit.
func Limit(limit uint64) func() (uint64, error) {
return func() (uint64, error) {
return limit, nil
}
}
// ApplyRationA is a helper Provider function that applies the given ratio to the given provider.
func ApplyRatio(provider Provider, ratio float64) Provider {
if ratio == 1 {
return provider
}
return func() (uint64, error) {
if ratio <= 0 || ratio > 1 {
return 0, fmt.Errorf("invalid ratio: %f, ratio should be in the range (0.0,1.0]", ratio)
}
limit, err := provider()
if err != nil {
return 0, err
}
return uint64(float64(limit) * ratio), nil
}
}
// ApplyFallback is a helper Provider function that sets the fallback provider.
func ApplyFallback(provider Provider, fallback Provider) Provider {
return func() (uint64, error) {
limit, err := provider()
if err != nil {
return fallback()
}
return limit, nil
}
}
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