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label_index.go
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/
label_index.go
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// Copyright (c) 2016 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 labelindex
import (
log "github.com/Sirupsen/logrus"
"github.com/projectcalico/libcalico-go/lib/selector"
)
type Index interface {
UpdateSelector(id interface{}, sel selector.Selector)
DeleteSelector(id interface{})
UpdateLabels(id interface{}, labels map[string]string)
DeleteLabels(id interface{})
}
type MatchCallback func(selId, labelId interface{})
type linearScanIndex struct {
// All known labels and selectors.
labelsById map[interface{}]map[string]string
selectorsById map[interface{}]selector.Selector
// Current matches.
selIdsByLabelId map[interface{}]map[interface{}]bool
labelIdsBySelId map[interface{}]map[interface{}]bool
// Callback functions
OnMatchStarted MatchCallback
OnMatchStopped MatchCallback
}
func NewIndex(onMatchStarted, onMatchStopped MatchCallback) Index {
return &linearScanIndex{
labelsById: make(map[interface{}]map[string]string),
selectorsById: make(map[interface{}]selector.Selector),
selIdsByLabelId: make(map[interface{}]map[interface{}]bool),
labelIdsBySelId: make(map[interface{}]map[interface{}]bool),
OnMatchStarted: onMatchStarted,
OnMatchStopped: onMatchStopped,
}
}
func (idx *linearScanIndex) UpdateSelector(id interface{}, sel selector.Selector) {
log.Infof("Updating selector %v", id)
if sel == nil {
panic("Selector should not be nil")
}
idx.scanAllLabels(id, sel)
idx.selectorsById[id] = sel
}
func (idx *linearScanIndex) DeleteSelector(id interface{}) {
log.Infof("Deleting selector %v", id)
matchSet := idx.labelIdsBySelId[id]
matchSlice := make([]interface{}, 0, len(matchSet))
for labelId, _ := range matchSet {
matchSlice = append(matchSlice, labelId)
}
for _, labelId := range matchSlice {
idx.deleteMatch(id, labelId)
}
delete(idx.selectorsById, id)
}
func (idx *linearScanIndex) UpdateLabels(id interface{}, labels map[string]string) {
log.Debugf("Updating labels for ID %v", id)
idx.scanAllSelectors(id, labels)
idx.labelsById[id] = labels
}
func (idx *linearScanIndex) DeleteLabels(id interface{}) {
log.Debugf("Deleting labels for %v", id)
matchSet := idx.selIdsByLabelId[id]
matchSlice := make([]interface{}, 0, len(matchSet))
for selId, _ := range matchSet {
matchSlice = append(matchSlice, selId)
}
for _, selId := range matchSlice {
idx.deleteMatch(selId, id)
}
delete(idx.labelsById, id)
}
func (idx *linearScanIndex) scanAllLabels(selId interface{}, sel selector.Selector) {
log.Debugf("Scanning all (%v) labels against selector %v",
len(idx.labelsById), selId)
for labelId, labels := range idx.labelsById {
idx.updateMatches(selId, sel, labelId, labels)
}
}
func (idx *linearScanIndex) scanAllSelectors(labelId interface{}, labels map[string]string) {
log.Debugf("Scanning all (%v) selectors against labels %v",
len(idx.selectorsById), labelId)
for selId, sel := range idx.selectorsById {
idx.updateMatches(selId, sel, labelId, labels)
}
}
func (idx *linearScanIndex) updateMatches(selId interface{}, sel selector.Selector,
labelId interface{}, labels map[string]string) {
nowMatches := sel.Evaluate(labels)
if nowMatches {
idx.storeMatch(selId, labelId)
} else {
idx.deleteMatch(selId, labelId)
}
}
func (idx *linearScanIndex) storeMatch(selId, labelId interface{}) {
previouslyMatched := idx.labelIdsBySelId[selId][labelId]
if !previouslyMatched {
log.Debugf("Selector %v now matches labels %v", selId, labelId)
labelIds, ok := idx.labelIdsBySelId[selId]
if !ok {
labelIds = make(map[interface{}]bool)
idx.labelIdsBySelId[selId] = labelIds
}
labelIds[labelId] = true
selIDs, ok := idx.selIdsByLabelId[labelId]
if !ok {
selIDs = make(map[interface{}]bool)
idx.selIdsByLabelId[labelId] = selIDs
}
selIDs[selId] = true
idx.OnMatchStarted(selId, labelId)
}
}
func (idx *linearScanIndex) deleteMatch(selId, labelId interface{}) {
previouslyMatched := idx.labelIdsBySelId[selId][labelId]
if previouslyMatched {
log.Debugf("Selector %v no longer matches labels %v",
selId, labelId)
delete(idx.labelIdsBySelId[selId], labelId)
if len(idx.labelIdsBySelId[selId]) == 0 {
delete(idx.labelIdsBySelId, selId)
}
delete(idx.selIdsByLabelId[labelId], selId)
if len(idx.selIdsByLabelId[labelId]) == 0 {
delete(idx.selIdsByLabelId, labelId)
}
idx.OnMatchStopped(selId, labelId)
}
}