119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package http
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import (
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"fmt"
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"sync"
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"github.com/blevesearch/bleve"
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)
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var indexNameMapping map[string]bleve.Index
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var indexNameMappingLock sync.RWMutex
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func RegisterIndexName(name string, idx bleve.Index) {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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if indexNameMapping == nil {
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indexNameMapping = make(map[string]bleve.Index)
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}
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indexNameMapping[name] = idx
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}
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func UnregisterIndexByName(name string) bleve.Index {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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if indexNameMapping == nil {
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return nil
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}
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rv := indexNameMapping[name]
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if rv != nil {
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delete(indexNameMapping, name)
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}
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return rv
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}
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func IndexByName(name string) bleve.Index {
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indexNameMappingLock.RLock()
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defer indexNameMappingLock.RUnlock()
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return indexNameMapping[name]
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}
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func IndexNames() []string {
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indexNameMappingLock.RLock()
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defer indexNameMappingLock.RUnlock()
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rv := make([]string, len(indexNameMapping))
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count := 0
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for k := range indexNameMapping {
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rv[count] = k
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count++
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}
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return rv
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}
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func UpdateAlias(alias string, add, remove []string) error {
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indexNameMappingLock.Lock()
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defer indexNameMappingLock.Unlock()
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index, exists := indexNameMapping[alias]
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if !exists {
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// new alias
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if len(remove) > 0 {
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return fmt.Errorf("cannot remove indexes from a new alias")
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}
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indexes := make([]bleve.Index, len(add))
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for i, addIndexName := range add {
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addIndex, indexExists := indexNameMapping[addIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", addIndexName)
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}
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indexes[i] = addIndex
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}
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indexAlias := bleve.NewIndexAlias(indexes...)
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indexNameMapping[alias] = indexAlias
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} else {
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// something with this name already exists
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indexAlias, isAlias := index.(bleve.IndexAlias)
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if !isAlias {
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return fmt.Errorf("'%s' is not an alias", alias)
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}
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// build list of add indexes
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addIndexes := make([]bleve.Index, len(add))
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for i, addIndexName := range add {
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addIndex, indexExists := indexNameMapping[addIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", addIndexName)
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}
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addIndexes[i] = addIndex
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}
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// build list of remove indexes
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removeIndexes := make([]bleve.Index, len(remove))
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for i, removeIndexName := range remove {
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removeIndex, indexExists := indexNameMapping[removeIndexName]
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if !indexExists {
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return fmt.Errorf("index named '%s' does not exist", removeIndexName)
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}
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removeIndexes[i] = removeIndex
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}
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indexAlias.Swap(addIndexes, removeIndexes)
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}
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return nil
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}
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