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resource_limit.go
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/
resource_limit.go
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package queue
import (
"encoding/json"
"fmt"
"math/rand"
"reflect"
)
type ResourceLimit float64
// NewResourceLimit return ResourceLimit using the value of in. If in value
// is not in [0, 1] range an error is returned.
func NewResourceLimit(in float64) (ResourceLimit, error) {
if in < 0 || in > 1 {
return 0, fmt.Errorf("resource limit must be in a range [0, 1] (inclusive)")
}
return ResourceLimit(in), nil
}
// UnmarshalJSON is implementation of https://pkg.go.dev/encoding/json#Unmarshaler interface.
func (rl *ResourceLimit) UnmarshalJSON(data []byte) error {
var temp float64
if err := json.Unmarshal(data, &temp); err != nil {
return err
}
resourceLimit, err := NewResourceLimit(temp)
if err != nil {
return err
}
*rl = resourceLimit
return nil
}
// Generate is implementation of https://pkg.go.dev/testing/quick#Generator interface.
// This method is used for writing tests usign https://pkg.go.dev/testing/quick package
func (ResourceLimit) Generate(rand *rand.Rand, size int) reflect.Value {
float := rand.Float64()
return reflect.ValueOf(ResourceLimit(float))
}
type ResourceName string
const (
ResourceNameCPU ResourceName = "cpu"
ResourceNameMemory ResourceName = "memory"
)
// NewResourceName return ResourceName using the value of in. If in value
// is not one of: "cpu", "memory" an error is returned.
func NewResourceName(in string) (ResourceName, error) {
names := []ResourceName{ResourceNameCPU, ResourceNameMemory}
for _, name := range names {
rn := ResourceName(in)
if rn == name {
return rn, nil
}
}
return "", fmt.Errorf("resource name string: %s is invalid. Must be one of values: %v", in, names)
}
// UnmarshalJSON is implementation of https://pkg.go.dev/encoding/json#Unmarshaler interface.
func (rn *ResourceName) UnmarshalJSON(data []byte) error {
var temp string
if err := json.Unmarshal(data, &temp); err != nil {
return err
}
resourceName, err := NewResourceName(temp)
if err != nil {
return err
}
*rn = resourceName
return nil
}
// Generate is implementation of https://pkg.go.dev/testing/quick#Generator interface.
// This method is used for writing tests usign https://pkg.go.dev/testing/quick package
func (ResourceName) Generate(rand *rand.Rand, size int) reflect.Value {
resourceNames := []ResourceName{ResourceNameCPU, ResourceNameMemory}
return reflect.ValueOf(resourceNames[rand.Intn(len(resourceNames))])
}
type ResourceLimits map[ResourceName]ResourceLimit
// NewResourceLimits return ResourceLimits using the value of in. If any of the map values
// is not successfully converted to ResourceLimit an error is returned.
func NewResourceLimits(in map[string]float64) (ResourceLimits, error) {
out := make(ResourceLimits, len(in))
for resourceName, resourceLimit := range in {
name, err := NewResourceName(resourceName)
if err != nil {
return nil, err
}
limit, err := NewResourceLimit(resourceLimit)
if err != nil {
return nil, fmt.Errorf("failed to create limit for resource %s: %s", name, err)
}
out[name] = limit
}
return out, nil
}