163 lines
3.4 KiB
Go
163 lines
3.4 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-api-go/v2/netmap"
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)
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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.GetReplicas()
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selectors = p.GetSelectors()
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filters = p.GetFilters()
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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.GetContainerBackupFactor(); 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.GetCount()), 10))
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if s := replica.GetSelector(); 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.GetCount()), 10))
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if a := selector.GetAttribute(); a != "" {
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builder.WriteString(" IN")
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switch selector.GetClause() {
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case netmap.Same:
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builder.WriteString(" SAME ")
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case netmap.Distinct:
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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.GetFilter(); 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.GetName(); 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 operationString(operation netmap.Operation) string {
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switch operation {
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case netmap.EQ:
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return "EQ"
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case netmap.NE:
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return "NE"
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case netmap.GT:
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return "GT"
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case netmap.GE:
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return "GE"
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case netmap.LT:
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return "LT"
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case netmap.LE:
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return "LE"
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case netmap.OR:
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return "OR"
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case netmap.AND:
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return "AND"
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default:
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return ""
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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.GetOp() == netmap.UnspecifiedOperation
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if k := filter.GetKey(); k != "" {
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builder.WriteString(k)
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builder.WriteString(" ")
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builder.WriteString(operationString(filter.GetOp()))
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builder.WriteString(" ")
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builder.WriteString(filter.GetValue())
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} else if n := filter.GetName(); 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.GetFilters() {
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if i != 0 {
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builder.WriteString(" ")
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builder.WriteString(operationString(filter.GetOp()))
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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.GetName(); 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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