375fd15fbf
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- [x] Fix outdated example config.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>
103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package bleve
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import (
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"context"
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"fmt"
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"code.gitea.io/gitea/modules/indexer/internal"
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"code.gitea.io/gitea/modules/log"
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"github.com/blevesearch/bleve/v2"
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"github.com/blevesearch/bleve/v2/mapping"
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"github.com/ethantkoenig/rupture"
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)
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var _ internal.Indexer = &Indexer{}
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// Indexer represents a basic bleve indexer implementation
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type Indexer struct {
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Indexer bleve.Index
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indexDir string
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version int
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mappingGetter MappingGetter
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}
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type MappingGetter func() (mapping.IndexMapping, error)
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func NewIndexer(indexDir string, version int, mappingGetter func() (mapping.IndexMapping, error)) *Indexer {
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return &Indexer{
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indexDir: indexDir,
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version: version,
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mappingGetter: mappingGetter,
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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.Indexer != nil {
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return false, fmt.Errorf("indexer is already initialized")
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}
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indexer, version, err := openIndexer(i.indexDir, i.version)
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if err != nil {
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return false, err
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}
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if indexer != nil {
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i.Indexer = indexer
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return true, nil
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}
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if version != 0 {
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log.Warn("Found older bleve index with version %d, Gitea will remove it and rebuild", version)
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}
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indexMapping, err := i.mappingGetter()
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if err != nil {
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return false, err
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}
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indexer, err = bleve.New(i.indexDir, indexMapping)
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if err != nil {
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return false, err
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}
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if err = rupture.WriteIndexMetadata(i.indexDir, &rupture.IndexMetadata{
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Version: i.version,
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}); err != nil {
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return false, err
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}
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i.Indexer = indexer
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return false, nil
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}
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// Ping checks if the indexer is available
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func (i *Indexer) Ping(_ 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.Indexer == nil {
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return fmt.Errorf("indexer is not initialized")
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}
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return nil
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}
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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 err := i.Indexer.Close(); err != nil {
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log.Error("Failed to close bleve indexer in %q: %v", i.indexDir, err)
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}
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i.Indexer = nil
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}
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