forked from TrueCloudLab/frostfs-sdk-go
141 lines
3 KiB
Go
141 lines
3 KiB
Go
package policy
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/nspcc-dev/neofs-sdk-go/netmap"
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)
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// Encode parses data of PlacementPolicy to a string.
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func Encode(p *netmap.PlacementPolicy) []string {
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if p == nil {
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return nil
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}
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var (
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replicas = p.Replicas()
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selectors = p.Selectors()
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filters = p.Filters()
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)
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// 1 for container backup factor
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result := make([]string, 0, len(replicas)+len(selectors)+len(filters)+1)
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// first print replicas
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encodeReplicas(replicas, &result)
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// then backup factor
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if backupFactor := p.ContainerBackupFactor(); backupFactor != 0 {
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result = append(result, fmt.Sprintf("CBF %d", backupFactor))
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}
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// then selectors
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encodeSelectors(selectors, &result)
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// then filters
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encodeFilters(filters, &result)
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return result
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}
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func encodeReplicas(replicas []netmap.Replica, dst *[]string) {
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builder := new(strings.Builder)
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for _, replica := range replicas {
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builder.WriteString("REP ")
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builder.WriteString(strconv.FormatUint(uint64(replica.Count()), 10))
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if s := replica.Selector(); s != "" {
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builder.WriteString(" IN ")
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builder.WriteString(s)
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}
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*dst = append(*dst, builder.String())
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builder.Reset()
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}
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}
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func encodeSelectors(selectors []netmap.Selector, dst *[]string) {
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builder := new(strings.Builder)
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for _, selector := range selectors {
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builder.WriteString("SELECT ")
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builder.WriteString(strconv.FormatUint(uint64(selector.Count()), 10))
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if a := selector.Attribute(); a != "" {
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builder.WriteString(" IN")
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switch selector.Clause() {
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case netmap.ClauseSame:
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builder.WriteString(" SAME ")
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case netmap.ClauseDistinct:
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builder.WriteString(" DISTINCT ")
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default:
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builder.WriteString(" ")
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}
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builder.WriteString(a)
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}
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if f := selector.Filter(); f != "" {
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builder.WriteString(" FROM ")
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builder.WriteString(f)
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}
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if n := selector.Name(); n != "" {
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builder.WriteString(" AS ")
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builder.WriteString(n)
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}
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*dst = append(*dst, builder.String())
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builder.Reset()
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}
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}
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func encodeFilters(filters []netmap.Filter, dst *[]string) {
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builder := new(strings.Builder)
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for _, filter := range filters {
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builder.WriteString("FILTER ")
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builder.WriteString(encodeFilter(&filter))
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*dst = append(*dst, builder.String())
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builder.Reset()
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}
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}
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func encodeFilter(filter *netmap.Filter) string {
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builder := new(strings.Builder)
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unspecified := filter.Operation() == 0
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if k := filter.Key(); k != "" {
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builder.WriteString(k)
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builder.WriteString(" ")
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builder.WriteString(filter.Operation().String())
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builder.WriteString(" ")
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builder.WriteString(filter.Value())
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} else if n := filter.Name(); unspecified && n != "" {
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builder.WriteString("@")
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builder.WriteString(n)
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}
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for i, subfilter := range filter.InnerFilters() {
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if i != 0 {
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builder.WriteString(" ")
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builder.WriteString(filter.Operation().String())
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builder.WriteString(" ")
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}
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builder.WriteString(encodeFilter(&subfilter))
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}
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if n := filter.Name(); n != "" && !unspecified {
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builder.WriteString(" AS ")
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builder.WriteString(n)
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}
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return builder.String()
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}
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