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-rw-r--r--modules/indexer/internal/elasticsearch/indexer.go93
-rw-r--r--modules/indexer/internal/elasticsearch/util.go68
2 files changed, 161 insertions, 0 deletions
diff --git a/modules/indexer/internal/elasticsearch/indexer.go b/modules/indexer/internal/elasticsearch/indexer.go
new file mode 100644
index 0000000..395eea3
--- /dev/null
+++ b/modules/indexer/internal/elasticsearch/indexer.go
@@ -0,0 +1,93 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package elasticsearch
+
+import (
+ "context"
+ "fmt"
+
+ "code.gitea.io/gitea/modules/indexer/internal"
+
+ "github.com/olivere/elastic/v7"
+)
+
+var _ internal.Indexer = &Indexer{}
+
+// Indexer represents a basic elasticsearch indexer implementation
+type Indexer struct {
+ Client *elastic.Client
+
+ url string
+ indexName string
+ version int
+ mapping string
+}
+
+func NewIndexer(url, indexName string, version int, mapping string) *Indexer {
+ return &Indexer{
+ url: url,
+ indexName: indexName,
+ version: version,
+ mapping: mapping,
+ }
+}
+
+// Init initializes the indexer
+func (i *Indexer) Init(ctx context.Context) (bool, error) {
+ if i == nil {
+ return false, fmt.Errorf("cannot init nil indexer")
+ }
+ if i.Client != nil {
+ return false, fmt.Errorf("indexer is already initialized")
+ }
+
+ client, err := i.initClient()
+ if err != nil {
+ return false, err
+ }
+ i.Client = client
+
+ exists, err := i.Client.IndexExists(i.VersionedIndexName()).Do(ctx)
+ if err != nil {
+ return false, err
+ }
+ if exists {
+ return true, nil
+ }
+
+ if err := i.createIndex(ctx); err != nil {
+ return false, err
+ }
+
+ return exists, nil
+}
+
+// Ping checks if the indexer is available
+func (i *Indexer) Ping(ctx context.Context) error {
+ if i == nil {
+ return fmt.Errorf("cannot ping nil indexer")
+ }
+ if i.Client == nil {
+ return fmt.Errorf("indexer is not initialized")
+ }
+
+ resp, err := i.Client.ClusterHealth().Do(ctx)
+ if err != nil {
+ return err
+ }
+ if resp.Status != "green" && resp.Status != "yellow" {
+ // It's healthy if the status is green, and it's available if the status is yellow,
+ // see https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html
+ return fmt.Errorf("status of elasticsearch cluster is %s", resp.Status)
+ }
+ return nil
+}
+
+// Close closes the indexer
+func (i *Indexer) Close() {
+ if i == nil {
+ return
+ }
+ i.Client = nil
+}
diff --git a/modules/indexer/internal/elasticsearch/util.go b/modules/indexer/internal/elasticsearch/util.go
new file mode 100644
index 0000000..18cb152
--- /dev/null
+++ b/modules/indexer/internal/elasticsearch/util.go
@@ -0,0 +1,68 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package elasticsearch
+
+import (
+ "context"
+ "fmt"
+ "time"
+
+ "code.gitea.io/gitea/modules/log"
+
+ "github.com/olivere/elastic/v7"
+)
+
+// VersionedIndexName returns the full index name with version
+func (i *Indexer) VersionedIndexName() string {
+ return versionedIndexName(i.indexName, i.version)
+}
+
+func versionedIndexName(indexName string, version int) string {
+ if version == 0 {
+ // Old index name without version
+ return indexName
+ }
+ return fmt.Sprintf("%s.v%d", indexName, version)
+}
+
+func (i *Indexer) createIndex(ctx context.Context) error {
+ createIndex, err := i.Client.CreateIndex(i.VersionedIndexName()).BodyString(i.mapping).Do(ctx)
+ if err != nil {
+ return err
+ }
+ if !createIndex.Acknowledged {
+ return fmt.Errorf("create index %s with %s failed", i.VersionedIndexName(), i.mapping)
+ }
+
+ i.checkOldIndexes(ctx)
+
+ return nil
+}
+
+func (i *Indexer) initClient() (*elastic.Client, error) {
+ opts := []elastic.ClientOptionFunc{
+ elastic.SetURL(i.url),
+ elastic.SetSniff(false),
+ elastic.SetHealthcheckInterval(10 * time.Second),
+ elastic.SetGzip(false),
+ }
+
+ logger := log.GetLogger(log.DEFAULT)
+
+ opts = append(opts, elastic.SetTraceLog(&log.PrintfLogger{Logf: logger.Trace}))
+ opts = append(opts, elastic.SetInfoLog(&log.PrintfLogger{Logf: logger.Info}))
+ opts = append(opts, elastic.SetErrorLog(&log.PrintfLogger{Logf: logger.Error}))
+
+ return elastic.NewClient(opts...)
+}
+
+func (i *Indexer) checkOldIndexes(ctx context.Context) {
+ for v := 0; v < i.version; v++ {
+ indexName := versionedIndexName(i.indexName, v)
+ exists, err := i.Client.IndexExists(indexName).Do(ctx)
+ if err == nil && exists {
+ log.Warn("Found older elasticsearch index named %q, Forgejo will keep the old NOT DELETED. You can delete the old version after the upgrade succeed.", indexName)
+ }
+ }
+}