44 lines
1 KiB
Go
44 lines
1 KiB
Go
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package placement
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import (
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"errors"
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"strings"
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
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)
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const (
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attrPrefix = "$attribute:"
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)
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type Metric interface {
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CalculateValue(*netmap.NodeInfo, *netmap.NodeInfo) int
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}
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func ParseMetric(raw string) (Metric, error) {
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if attr, found := strings.CutPrefix(raw, attrPrefix); found {
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return NewAttributeMetric(attr), nil
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}
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return nil, errors.New("unsupported priority metric")
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}
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// attributeMetric describes priority metric based on attribute.
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type attributeMetric struct {
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attribute string
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}
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// CalculateValue return [0] if from and to contains attribute attributeMetric.attribute and
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// the value of attribute is the same. In other case return [1].
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func (am *attributeMetric) CalculateValue(from *netmap.NodeInfo, to *netmap.NodeInfo) int {
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fromAttr := from.Attribute(am.attribute)
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toAttr := to.Attribute(am.attribute)
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if len(fromAttr) > 0 && len(toAttr) > 0 && fromAttr == toAttr {
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return 0
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}
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return 1
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}
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func NewAttributeMetric(attr string) Metric {
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return &attributeMetric{attribute: attr}
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}
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