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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>
93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package meilisearch
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import (
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"context"
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"fmt"
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"github.com/meilisearch/meilisearch-go"
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)
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// Indexer represents a basic meilisearch indexer implementation
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type Indexer struct {
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Client *meilisearch.Client
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url, apiKey string
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indexName string
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version int
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}
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func NewIndexer(url, apiKey, indexName string, version int) *Indexer {
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return &Indexer{
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url: url,
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apiKey: apiKey,
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indexName: indexName,
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version: version,
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}
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}
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// Init initializes the indexer
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func (i *Indexer) Init(_ context.Context) (bool, error) {
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if i == nil {
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return false, fmt.Errorf("cannot init nil indexer")
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}
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if i.Client != nil {
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return false, fmt.Errorf("indexer is already initialized")
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}
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i.Client = meilisearch.NewClient(meilisearch.ClientConfig{
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Host: i.url,
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APIKey: i.apiKey,
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})
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_, err := i.Client.GetIndex(i.VersionedIndexName())
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if err == nil {
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return true, nil
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}
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_, err = i.Client.CreateIndex(&meilisearch.IndexConfig{
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Uid: i.VersionedIndexName(),
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PrimaryKey: "id",
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})
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if err != nil {
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return false, err
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}
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i.checkOldIndexes()
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_, err = i.Client.Index(i.VersionedIndexName()).UpdateFilterableAttributes(&[]string{"repo_id"})
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return false, err
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}
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// Ping checks if the indexer is available
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func (i *Indexer) Ping(ctx context.Context) error {
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if i == nil {
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return fmt.Errorf("cannot ping nil indexer")
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}
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if i.Client == nil {
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return fmt.Errorf("indexer is not initialized")
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}
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resp, err := i.Client.Health()
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if err != nil {
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return err
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}
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if resp.Status != "available" {
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// See https://docs.meilisearch.com/reference/api/health.html#status
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return fmt.Errorf("status of meilisearch is not available: %s", resp.Status)
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}
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return nil
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}
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// Close closes the indexer
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func (i *Indexer) Close() {
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if i == nil {
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return
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}
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if i.Client == nil {
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return
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}
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i.Client = nil
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}
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