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selectors.go
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selectors.go
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// Copyright (c) 2019 Tigera, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package updateprocessors
import (
"fmt"
log "github.com/sirupsen/logrus"
"github.com/dtest11/calico/libcalico-go/lib/selector/parser"
)
// parseSelectorAttachPrefix takes a v3 selector and returns the appropriate v1 representation
// by prefixing the keys with the given prefix.
// If prefix is `pcns.` then the selector changes from `k == 'v'` to `pcns.k == 'v'`.
func parseSelectorAttachPrefix(s, prefix string) string {
parsedSelector, err := parser.Parse(s)
if err != nil {
log.WithError(err).Errorf("Failed to parse selector: %s (for prefix) %s", s, prefix)
return ""
}
parsedSelector.AcceptVisitor(parser.PrefixVisitor{Prefix: prefix})
updated := parsedSelector.String()
log.WithFields(log.Fields{"original": s, "updated": updated}).Debug("Updated selector")
return updated
}
// prefixAndAppendSelector prefixes a new selector string with the given prefix and appends it to an existing selector string.
func prefixAndAppendSelector(currentSelector, newSelector, prefix string) string {
if newSelector != "" {
prefixedSelector := parseSelectorAttachPrefix(newSelector, prefix)
if prefixedSelector != "" {
if currentSelector != "" {
currentSelector = fmt.Sprintf("(%s) && %s", currentSelector, prefixedSelector)
} else {
currentSelector = prefixedSelector
}
}
}
return currentSelector
}