forked from ctdk/goiardi
/
indexer.go
205 lines (181 loc) · 5.24 KB
/
indexer.go
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/*
* Copyright (c) 2013-2017, Jeremy Bingham (<jeremy@goiardi.gl>)
*
* 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 indexer indexes objects that implement the Indexable interface. The
// index is all in memory right now, but it can be frozen and saved to disk for
// persistence.
package indexer
import (
"fmt"
"runtime"
"sync"
"github.com/ctdk/goiardi/config"
"github.com/tideland/golib/logger"
)
var riM *sync.Mutex
func init() {
riM = new(sync.Mutex)
}
// Indexable is an interface that provides all the information necessary to
// index an object. All objects that will be indexed need to implement this.
type Indexable interface {
DocID() string
Index() string
Flatten() map[string]interface{}
}
// Index holds a map of document collections.
type Index interface {
Search(string, string, bool) (map[string]Document, error)
SearchText(string, string, bool) (map[string]Document, error)
SearchRange(string, string, string, string, bool, bool) (map[string]Document, error)
SearchResults(string, bool, map[string]Document) (map[string]Document, error)
SearchResultsRange(string, string, string, bool, bool, map[string]Document) (map[string]Document, error)
SearchResultsText(string, bool, map[string]Document) (map[string]Document, error)
Save() error
Load() error
ObjIndexer
}
type ObjIndexer interface {
Initialize() error
CreateCollection(string) error
CreateNewCollection(string) error
DeleteCollection(string) error
DeleteItem(string, string) error
SaveItem(Indexable) error
Endpoints() ([]string, error)
Clear() error
}
type Document interface {
}
var indexMap Index
var objIndex ObjIndexer
func Initialize(config *config.Conf) {
if config.PgSearch {
objIndex = new(PostgresIndex)
objIndex.Initialize()
} else {
fileindex := new(FileIndex)
fileindex.file = config.IndexFile
im := Index(fileindex)
im.Initialize()
indexMap = im
objIndex = im
}
}
func GetIndex() Index {
// right now just return the index map
return indexMap
}
// CreateNewCollection creates an index for data bags when they are created,
// rather than when the first data bag item is uploaded
func CreateNewCollection(idxName string) {
objIndex.CreateNewCollection(idxName)
}
// DeleteCollection deletes a collection from the index. Useful only for data
// bags.
func DeleteCollection(idxName string) error {
/* Don't try and delete built-in indexes */
if idxName == "node" || idxName == "client" || idxName == "environment" || idxName == "role" {
err := fmt.Errorf("%s is a default search index, cannot be deleted.", idxName)
return err
}
return objIndex.DeleteCollection(idxName)
}
// DeleteItemFromCollection deletes an item from a collection
func DeleteItemFromCollection(idxName string, doc string) error {
err := objIndex.DeleteItem(idxName, doc)
return err
}
// IndexObj processes and adds an object to the index.
func IndexObj(object Indexable) {
go objIndex.SaveItem(object)
}
// Endpoints returns a list of currently indexed endpoints.
func Endpoints() ([]string, error) {
endpoints, err := objIndex.Endpoints()
return endpoints, err
}
// SaveIndex saves the index files to disk.
func SaveIndex() error {
// TODO: do better
if config.Config.PgSearch {
return nil
}
return indexMap.Save()
}
// LoadIndex loads index files from disk.
func LoadIndex() error {
if config.Config.PgSearch {
return nil
}
return indexMap.Load()
}
// ClearIndex of all collections and documents
func ClearIndex() {
err := objIndex.Clear()
if err != nil {
logger.Errorf("Error clearing db for reindexing: %s", err.Error())
}
return
}
// ReIndex rebuilds the search index from scratch
func ReIndex(objects []Indexable, rCh chan struct{}) error {
go func() {
z := 0
t := "(none)"
if len(objects) > 0 {
z = len(objects)
t = fmt.Sprintf("%T", objects[0])
logger.Debugf("starting to reindex %d objects of %s type", z, t)
} else {
logger.Debugf("No objects actually in this round of reindexing")
}
// take the mutex
logger.Debugf("attempting to take indexer.ReIndex mutex (%d %s)", z, t)
riM.Lock()
logger.Debugf("indexer.ReIndex mutex (%d %s) taken", z, t)
mCh := make(chan struct{}, 1)
defer func() {
<-mCh
logger.Debugf("releasing indexer.ReIndex mutex (%d %s)", z, t)
rCh <- struct{}{}
riM.Unlock()
}()
ch := make(chan Indexable, runtime.NumCPU())
fCh := make(chan struct{}, z)
for i := 0; i < runtime.NumCPU(); i++ {
go func() {
for obj := range ch {
objIndex.SaveItem(obj)
fCh <- struct{}{}
}
return
}()
}
for _, o := range objects {
ch <- o
}
close(ch)
if z > 0 {
for y := 0; y < z; y++ {
<-fCh
}
}
mCh <- struct{}{}
}()
// We really ought to be able to return from an error, but at the moment
// there aren't any ways it does so in the index save bits.
return nil
}