new filer option to es v7.

4 files changed, 304 insertions, 0 deletions

diff --git a/go.mod b/go.mod
index cdb951f9c..d2dad60cd 100644
--- a/go.mod
+++ b/go.mod
@@ -87,6 +87,8 @@ require (
 	gopkg.in/jcmturner/goidentity.v3 v3.0.0 // indirect
 	gopkg.in/jcmturner/gokrb5.v7 v7.3.0 // indirect
 	gopkg.in/karlseguin/expect.v1 v1.0.1 // indirect
+	github.com/json-iterator/go v1.1.10
+	github.com/olivere/elastic/v7 v7.0.19
 )
 
 replace go.etcd.io/etcd => go.etcd.io/etcd v0.5.0-alpha.5.0.20200425165423-262c93980547
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index b199f2d2d..c07751786 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -173,6 +173,12 @@ enabled = false
 uri = "mongodb://localhost:27017"
 option_pool_size = 0
 database = "seaweedfs"
+
+[elastic7]
+enabled = false
+servers = "http://localhost:9200"
+# increase the value is recommend, both filer and elastic cluster
+index.max_result_window = 10000
 `
 
 	NOTIFICATION_TOML_EXAMPLE = `
diff --git a/weed/filer/elastic/v7/elastic_store.go b/weed/filer/elastic/v7/elastic_store.go
new file mode 100644
index 000000000..190ec4897
--- /dev/null
+++ b/weed/filer/elastic/v7/elastic_store.go
@@ -0,0 +1,295 @@
+package elastic
+
+import (
+	"context"
+	"crypto/md5"
+	"fmt"
+	"math"
+	"strings"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"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_"
+)
+
+type ESEntry struct {
+	ParentId string `json:"ParentId"`
+	Entry    *filer2.Entry
+}
+
+func init() {
+	filer2.Stores = append(filer2.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 {
+		return fmt.Errorf("error elastic index.max_result_window.")
+	}
+	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)
+	}
+	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) InsertEntry(ctx context.Context, entry *filer2.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(context.Background())
+	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 *filer2.Entry) (err error) {
+	return store.InsertEntry(ctx, entry)
+}
+func (store *ElasticStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer2.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(context.Background())
+	if elastic.IsNotFound(err) {
+		return nil, filer_pb.ErrNotFound
+	}
+	if searchResult != nil && searchResult.Found {
+		esEntry := &ESEntry{
+			ParentId: "",
+			Entry:    &filer2.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(index)
+	}
+	return store.deleteEntry(index, id)
+}
+func (store *ElasticStore) deleteIndex(index string) (err error) {
+	deleteResult, err := store.client.DeleteIndex(index).Do(context.Background())
+	if elastic.IsNotFound(err) || (err == nil && deleteResult.Acknowledged) {
+		return nil
+	}
+	glog.Errorf("delete index(%s) %v.", index, err)
+	return err
+}
+func (store *ElasticStore) deleteEntry(index, id string) (err error) {
+	deleteResult, err := store.client.Delete().
+		Index(index).
+		Type(indexType).
+		Id(id).
+		Do(context.Background())
+	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 []*filer2.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 []*filer2.Entry, err error) {
+	indexResult, err := store.client.CatIndices().Do(context.Background())
+	if err != nil {
+		glog.Errorf("list indices %v.", err)
+		return entries, err
+	}
+	for _, index := range indexResult {
+		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 []*filer2.Entry, err error) {
+	first := true
+	index := getIndex(fullpath)
+	nextStart := ""
+	parentId := fmt.Sprintf("%x", md5.Sum([]byte(fullpath)))
+	if _, err := store.client.Refresh(index).Do(context.Background()); err != nil {
+		if elastic.IsNotFound(err) {
+			store.client.CreateIndex(index).Do(context.Background())
+			return entries, nil
+		}
+	}
+	for {
+		result := &elastic.SearchResult{}
+		if (startFileName == "" && first) || inclusive {
+			if result, err = store.search(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(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:    &filer2.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(index, parentId string) (result *elastic.SearchResult, err error) {
+	if count, err := store.client.Count(index).Do(context.Background()); 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(context.Background())
+	return queryResult, err
+}
+
+func (store *ElasticStore) searchAfter(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(context.Background())
+	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 ""
+}
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 160ea5a6d..167a822b2 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -28,6 +28,7 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/filer/postgres"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/redis"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/redis2"
+	_ "github.com/chrislusf/seaweedfs/weed/filer2/elastic/v7"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/notification"
 	_ "github.com/chrislusf/seaweedfs/weed/notification/aws_sqs"