seaweedfs/weed/filer/elastic/v7/elastic_store.go
2020-09-04 21:49:03 +08:00

319 lines
9.3 KiB
Go

package elastic
import (
"context"
"crypto/md5"
"fmt"
"math"
"strings"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
weed_util "github.com/chrislusf/seaweedfs/weed/util"
jsoniter "github.com/json-iterator/go"
elastic "github.com/olivere/elastic/v7"
)
var (
indexType = "_doc"
indexPrefix = ".seaweedfs_"
indexKV = ".seaweedfs_kv_entries"
mappingWithoutQuery = ` {
"mappings": {
"enabled": false
}
}`
)
type ESEntry struct {
ParentId string `json:"ParentId"`
Entry *filer.Entry
}
type ESKVEntry struct {
Value string `json:Value`
}
func init() {
filer.Stores = append(filer.Stores, &ElasticStore{})
}
type ElasticStore struct {
client *elastic.Client
maxPageSize int
}
func (store *ElasticStore) GetName() string {
return "elastic7"
}
func (store *ElasticStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
servers := configuration.GetString(prefix + "servers")
if servers == "" {
return fmt.Errorf("error elastic endpoints.")
}
store.maxPageSize = configuration.GetInt(prefix + "index.max_result_window")
if store.maxPageSize <= 0 {
store.maxPageSize = 10000
}
glog.Infof("filer store elastic endpoints: %s, index.max_result_window:%d", servers, store.maxPageSize)
store.client, err = elastic.NewClient(
elastic.SetSniff(false),
elastic.SetHealthcheck(false),
elastic.SetURL(servers),
)
if err != nil {
return fmt.Errorf("init elastic %s: %v.", servers, err)
}
if ok, err := store.client.IndexExists(indexKV).Do(context.Background()); err == nil && !ok {
_, err = store.client.CreateIndex(indexKV).Body(mappingWithoutQuery).Do(context.Background())
if err != nil {
return fmt.Errorf("create index(%s) %v.", indexKV, err)
}
}
return nil
}
func (store *ElasticStore) BeginTransaction(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (store *ElasticStore) CommitTransaction(ctx context.Context) error {
return nil
}
func (store *ElasticStore) RollbackTransaction(ctx context.Context) error {
return nil
}
func (store *ElasticStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
return nil, filer.ErrUnsupportedListDirectoryPrefixed
}
func (store *ElasticStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
index := getIndex(entry.FullPath)
dir, _ := entry.FullPath.DirAndName()
id := fmt.Sprintf("%x", md5.Sum([]byte(entry.FullPath)))
esEntry := &ESEntry{
ParentId: fmt.Sprintf("%x", md5.Sum([]byte(dir))),
Entry: entry,
}
value, err := jsoniter.Marshal(esEntry)
if err != nil {
glog.Errorf("insert entry(%s) %v.", string(entry.FullPath), err)
return fmt.Errorf("insert entry %v.", err)
}
_, err = store.client.Index().
Index(index).
Type(indexType).
Id(id).
BodyJson(string(value)).
Do(ctx)
if err != nil {
glog.Errorf("insert entry(%s) %v.", string(entry.FullPath), err)
return fmt.Errorf("insert entry %v.", err)
}
return nil
}
func (store *ElasticStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
return store.InsertEntry(ctx, entry)
}
func (store *ElasticStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
index := getIndex(fullpath)
id := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
searchResult, err := store.client.Get().
Index(index).
Type(indexType).
Id(id).
Do(ctx)
if elastic.IsNotFound(err) {
return nil, filer_pb.ErrNotFound
}
if searchResult != nil && searchResult.Found {
esEntry := &ESEntry{
ParentId: "",
Entry: &filer.Entry{},
}
err := jsoniter.Unmarshal(searchResult.Source, esEntry)
return esEntry.Entry, err
}
glog.Errorf("find entry(%s),%v.", string(fullpath), err)
return nil, filer_pb.ErrNotFound
}
func (store *ElasticStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
index := getIndex(fullpath)
id := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
if strings.Count(string(fullpath), "/") == 1 {
return store.deleteIndex(ctx, index)
}
return store.deleteEntry(ctx, index, id)
}
func (store *ElasticStore) deleteIndex(ctx context.Context, index string) (err error) {
deleteResult, err := store.client.DeleteIndex(index).Do(ctx)
if elastic.IsNotFound(err) || (err == nil && deleteResult.Acknowledged) {
return nil
}
glog.Errorf("delete index(%s) %v.", index, err)
return err
}
func (store *ElasticStore) deleteEntry(ctx context.Context, index, id string) (err error) {
deleteResult, err := store.client.Delete().
Index(index).
Type(indexType).
Id(id).
Do(ctx)
if err == nil {
if deleteResult.Result == "deleted" || deleteResult.Result == "not_found" {
return nil
}
}
glog.Errorf("delete entry(index:%s,_id:%s) %v.", index, id, err)
return fmt.Errorf("delete entry %v.", err)
}
func (store *ElasticStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
if entries, err := store.ListDirectoryEntries(ctx, fullpath, "", false, math.MaxInt32); err == nil {
for _, entry := range entries {
store.DeleteEntry(ctx, entry.FullPath)
}
}
return nil
}
func (store *ElasticStore) ListDirectoryEntries(
ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int,
) (entries []*filer.Entry, err error) {
if string(fullpath) == "/" {
return store.listRootDirectoryEntries(ctx, startFileName, inclusive, limit)
}
return store.listDirectoryEntries(ctx, fullpath, startFileName, inclusive, limit)
}
func (store *ElasticStore) listRootDirectoryEntries(ctx context.Context, startFileName string, inclusive bool, limit int) (entries []*filer.Entry, err error) {
indexResult, err := store.client.CatIndices().Do(ctx)
if err != nil {
glog.Errorf("list indices %v.", err)
return entries, err
}
for _, index := range indexResult {
if index.Index == indexKV {
continue
}
if strings.HasPrefix(index.Index, indexPrefix) {
if entry, err := store.FindEntry(ctx,
weed_util.FullPath("/"+strings.Replace(index.Index, indexPrefix, "", 1))); err == nil {
fileName := getFileName(entry.FullPath)
if fileName == startFileName && !inclusive {
continue
}
limit--
if limit < 0 {
break
}
entries = append(entries, entry)
}
}
}
return entries, nil
}
func (store *ElasticStore) listDirectoryEntries(
ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int,
) (entries []*filer.Entry, err error) {
first := true
index := getIndex(fullpath)
nextStart := ""
parentId := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
if _, err := store.client.Refresh(index).Do(ctx); err != nil {
if elastic.IsNotFound(err) {
store.client.CreateIndex(index).Do(ctx)
return entries, nil
}
}
for {
result := &elastic.SearchResult{}
if (startFileName == "" && first) || inclusive {
if result, err = store.search(ctx, index, parentId); err != nil {
glog.Errorf("search (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
return entries, err
}
} else {
fullPath := string(fullpath) + "/" + startFileName
if !first {
fullPath = nextStart
}
after := fmt.Sprintf("%x", md5.Sum([]byte(fullPath)))
if result, err = store.searchAfter(ctx, index, parentId, after); err != nil {
glog.Errorf("searchAfter (%s,%s,%t,%d) %v.", string(fullpath), startFileName, inclusive, limit, err)
return entries, err
}
}
first = false
for _, hit := range result.Hits.Hits {
esEntry := &ESEntry{
ParentId: "",
Entry: &filer.Entry{},
}
if err := jsoniter.Unmarshal(hit.Source, esEntry); err == nil {
limit--
if limit < 0 {
return entries, nil
}
nextStart = string(esEntry.Entry.FullPath)
fileName := getFileName(esEntry.Entry.FullPath)
if fileName == startFileName && !inclusive {
continue
}
entries = append(entries, esEntry.Entry)
}
}
if len(result.Hits.Hits) < store.maxPageSize {
break
}
}
return entries, nil
}
func (store *ElasticStore) search(ctx context.Context, index, parentId string) (result *elastic.SearchResult, err error) {
if count, err := store.client.Count(index).Do(ctx); err == nil && count == 0 {
return &elastic.SearchResult{
Hits: &elastic.SearchHits{
Hits: make([]*elastic.SearchHit, 0)},
}, nil
}
queryResult, err := store.client.Search().
Index(index).
Query(elastic.NewMatchQuery("ParentId", parentId)).
Size(store.maxPageSize).
Sort("_id", false).
Do(ctx)
return queryResult, err
}
func (store *ElasticStore) searchAfter(ctx context.Context, index, parentId, after string) (result *elastic.SearchResult, err error) {
queryResult, err := store.client.Search().
Index(index).
Query(elastic.NewMatchQuery("ParentId", parentId)).
SearchAfter(after).
Size(store.maxPageSize).
Sort("_id", false).
Do(ctx)
return queryResult, err
}
func (store *ElasticStore) Shutdown() {
store.client.Stop()
}
func getIndex(fullpath weed_util.FullPath) string {
path := strings.Split(string(fullpath), "/")
if len(path) > 1 {
return indexPrefix + path[1]
}
return ""
}
func getFileName(fullpath weed_util.FullPath) string {
path := strings.Split(string(fullpath), "/")
if len(path) > 1 {
return path[len(path)-1]
}
return ""
}