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gitea/modules/indexer/internal/meilisearch/indexer.go

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Refactor indexer (#25174) Refactor `modules/indexer` to make it more maintainable. And it can be easier to support more features. I'm trying to solve some of issue searching, this is a precursor to making functional changes. Current supported engines and the index versions: | engines | issues | code | | - | - | - | | db | Just a wrapper for database queries, doesn't need version | - | | bleve | The version of index is **2** | The version of index is **6** | | elasticsearch | The old index has no version, will be treated as version **0** in this PR | The version of index is **1** | | meilisearch | The old index has no version, will be treated as version **0** in this PR | - | ## Changes ### Split Splited it into mutiple packages ```text indexer ├── internal │   ├── bleve │   ├── db │   ├── elasticsearch │   └── meilisearch ├── code │   ├── bleve │   ├── elasticsearch │   └── internal └── issues ├── bleve ├── db ├── elasticsearch ├── internal └── meilisearch ``` - `indexer/interanal`: Internal shared package for indexer. - `indexer/interanal/[engine]`: Internal shared package for each engine (bleve/db/elasticsearch/meilisearch). - `indexer/code`: Implementations for code indexer. - `indexer/code/internal`: Internal shared package for code indexer. - `indexer/code/[engine]`: Implementation via each engine for code indexer. - `indexer/issues`: Implementations for issues indexer. ### Deduplication - Combine `Init/Ping/Close` for code indexer and issues indexer. - ~Combine `issues.indexerHolder` and `code.wrappedIndexer` to `internal.IndexHolder`.~ Remove it, use dummy indexer instead when the indexer is not ready. - Duplicate two copies of creating ES clients. - Duplicate two copies of `indexerID()`. ### Enhancement - [x] Support index version for elasticsearch issues indexer, the old index without version will be treated as version 0. - [x] Fix spell of `elastic_search/ElasticSearch`, it should be `Elasticsearch`. - [x] Improve versioning of ES index. We don't need `Aliases`: - Gitea does't need aliases for "Zero Downtime" because it never delete old indexes. - The old code of issues indexer uses the orignal name to create issue index, so it's tricky to convert it to an alias. - [x] Support index version for meilisearch issues indexer, the old index without version will be treated as version 0. - [x] Do "ping" only when `Ping` has been called, don't ping periodically and cache the status. - [x] Support the context parameter whenever possible. - [x] Fix outdated example config. - [x] Give up the requeue logic of issues indexer: When indexing fails, call Ping to check if it was caused by the engine being unavailable, and only requeue the task if the engine is unavailable. - It is fragile and tricky, could cause data losing (It did happen when I was doing some tests for this PR). And it works for ES only. - Just always requeue the failed task, if it caused by bad data, it's a bug of Gitea which should be fixed. --------- Co-authored-by: Giteabot <teabot@gitea.io>
2023-06-23 20:37:56 +08:00
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package meilisearch
import (
"context"
"fmt"
"github.com/meilisearch/meilisearch-go"
)
// Indexer represents a basic meilisearch indexer implementation
type Indexer struct {
Client *meilisearch.Client
url, apiKey string
indexName string
version int
}
func NewIndexer(url, apiKey, indexName string, version int) *Indexer {
return &Indexer{
url: url,
apiKey: apiKey,
indexName: indexName,
version: version,
}
}
// Init initializes the indexer
func (i *Indexer) Init(_ 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")
}
i.Client = meilisearch.NewClient(meilisearch.ClientConfig{
Host: i.url,
APIKey: i.apiKey,
})
_, err := i.Client.GetIndex(i.VersionedIndexName())
if err == nil {
return true, nil
}
_, err = i.Client.CreateIndex(&meilisearch.IndexConfig{
Uid: i.VersionedIndexName(),
PrimaryKey: "id",
})
if err != nil {
return false, err
}
i.checkOldIndexes()
_, err = i.Client.Index(i.VersionedIndexName()).UpdateFilterableAttributes(&[]string{"repo_id"})
return false, err
}
// 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.Health()
if err != nil {
return err
}
if resp.Status != "available" {
// See https://docs.meilisearch.com/reference/api/health.html#status
return fmt.Errorf("status of meilisearch is not available: %s", resp.Status)
}
return nil
}
// Close closes the indexer
func (i *Indexer) Close() {
if i == nil {
return
}
if i.Client == nil {
return
}
i.Client = nil
}