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forgejo/modules/indexer/issues/indexer.go
Jason Song 375fd15fbf
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 12:37:56 +00:00

297 lines
9.6 KiB
Go

// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package issues
import (
"context"
"os"
"runtime/pprof"
"sync/atomic"
"time"
db_model "code.gitea.io/gitea/models/db"
issues_model "code.gitea.io/gitea/models/issues"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/indexer/issues/bleve"
"code.gitea.io/gitea/modules/indexer/issues/db"
"code.gitea.io/gitea/modules/indexer/issues/elasticsearch"
"code.gitea.io/gitea/modules/indexer/issues/internal"
"code.gitea.io/gitea/modules/indexer/issues/meilisearch"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/queue"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
)
var (
// issueIndexerQueue queue of issue ids to be updated
issueIndexerQueue *queue.WorkerPoolQueue[*internal.IndexerData]
// globalIndexer is the global indexer, it cannot be nil.
// When the real indexer is not ready, it will be a dummy indexer which will return error to explain it's not ready.
// So it's always safe use it as *globalIndexer.Load() and call its methods.
globalIndexer atomic.Pointer[internal.Indexer]
dummyIndexer *internal.Indexer
)
func init() {
i := internal.NewDummyIndexer()
dummyIndexer = &i
globalIndexer.Store(dummyIndexer)
}
// InitIssueIndexer initialize issue indexer, syncReindex is true then reindex until
// all issue index done.
func InitIssueIndexer(syncReindex bool) {
ctx, _, finished := process.GetManager().AddTypedContext(context.Background(), "Service: IssueIndexer", process.SystemProcessType, false)
indexerInitWaitChannel := make(chan time.Duration, 1)
// Create the Queue
switch setting.Indexer.IssueType {
case "bleve", "elasticsearch", "meilisearch":
handler := func(items ...*internal.IndexerData) (unhandled []*internal.IndexerData) {
indexer := *globalIndexer.Load()
toIndex := make([]*internal.IndexerData, 0, len(items))
for _, indexerData := range items {
log.Trace("IndexerData Process: %d %v %t", indexerData.ID, indexerData.IDs, indexerData.IsDelete)
if indexerData.IsDelete {
if err := indexer.Delete(ctx, indexerData.IDs...); err != nil {
log.Error("Issue indexer handler: failed to from index: %v Error: %v", indexerData.IDs, err)
unhandled = append(unhandled, indexerData)
}
continue
}
toIndex = append(toIndex, indexerData)
}
if err := indexer.Index(ctx, toIndex); err != nil {
log.Error("Error whilst indexing: %v Error: %v", toIndex, err)
unhandled = append(unhandled, toIndex...)
}
return unhandled
}
issueIndexerQueue = queue.CreateSimpleQueue(ctx, "issue_indexer", handler)
if issueIndexerQueue == nil {
log.Fatal("Unable to create issue indexer queue")
}
default:
issueIndexerQueue = queue.CreateSimpleQueue[*internal.IndexerData](ctx, "issue_indexer", nil)
}
graceful.GetManager().RunAtTerminate(finished)
// Create the Indexer
go func() {
pprof.SetGoroutineLabels(ctx)
start := time.Now()
log.Info("PID %d: Initializing Issue Indexer: %s", os.Getpid(), setting.Indexer.IssueType)
var (
issueIndexer internal.Indexer
existed bool
err error
)
switch setting.Indexer.IssueType {
case "bleve":
defer func() {
if err := recover(); err != nil {
log.Error("PANIC whilst initializing issue indexer: %v\nStacktrace: %s", err, log.Stack(2))
log.Error("The indexer files are likely corrupted and may need to be deleted")
log.Error("You can completely remove the %q directory to make Gitea recreate the indexes", setting.Indexer.IssuePath)
globalIndexer.Store(dummyIndexer)
log.Fatal("PID: %d Unable to initialize the Bleve Issue Indexer at path: %s Error: %v", os.Getpid(), setting.Indexer.IssuePath, err)
}
}()
issueIndexer = bleve.NewIndexer(setting.Indexer.IssuePath)
existed, err = issueIndexer.Init(ctx)
if err != nil {
log.Fatal("Unable to initialize Bleve Issue Indexer at path: %s Error: %v", setting.Indexer.IssuePath, err)
}
case "elasticsearch":
issueIndexer = elasticsearch.NewIndexer(setting.Indexer.IssueConnStr, setting.Indexer.IssueIndexerName)
existed, err = issueIndexer.Init(ctx)
if err != nil {
log.Fatal("Unable to issueIndexer.Init with connection %s Error: %v", setting.Indexer.IssueConnStr, err)
}
case "db":
issueIndexer = db.NewIndexer()
case "meilisearch":
issueIndexer = meilisearch.NewIndexer(setting.Indexer.IssueConnStr, setting.Indexer.IssueConnAuth, setting.Indexer.IssueIndexerName)
existed, err = issueIndexer.Init(ctx)
if err != nil {
log.Fatal("Unable to issueIndexer.Init with connection %s Error: %v", setting.Indexer.IssueConnStr, err)
}
default:
log.Fatal("Unknown issue indexer type: %s", setting.Indexer.IssueType)
}
globalIndexer.Store(&issueIndexer)
graceful.GetManager().RunAtTerminate(func() {
log.Debug("Closing issue indexer")
(*globalIndexer.Load()).Close()
log.Info("PID: %d Issue Indexer closed", os.Getpid())
})
// Start processing the queue
go graceful.GetManager().RunWithCancel(issueIndexerQueue)
// Populate the index
if !existed {
if syncReindex {
graceful.GetManager().RunWithShutdownContext(populateIssueIndexer)
} else {
go graceful.GetManager().RunWithShutdownContext(populateIssueIndexer)
}
}
indexerInitWaitChannel <- time.Since(start)
close(indexerInitWaitChannel)
}()
if syncReindex {
select {
case <-indexerInitWaitChannel:
case <-graceful.GetManager().IsShutdown():
}
} else if setting.Indexer.StartupTimeout > 0 {
go func() {
pprof.SetGoroutineLabels(ctx)
timeout := setting.Indexer.StartupTimeout
if graceful.GetManager().IsChild() && setting.GracefulHammerTime > 0 {
timeout += setting.GracefulHammerTime
}
select {
case duration := <-indexerInitWaitChannel:
log.Info("Issue Indexer Initialization took %v", duration)
case <-graceful.GetManager().IsShutdown():
log.Warn("Shutdown occurred before issue index initialisation was complete")
case <-time.After(timeout):
issueIndexerQueue.ShutdownWait(5 * time.Second)
log.Fatal("Issue Indexer Initialization timed-out after: %v", timeout)
}
}()
}
}
// populateIssueIndexer populate the issue indexer with issue data
func populateIssueIndexer(ctx context.Context) {
ctx, _, finished := process.GetManager().AddTypedContext(ctx, "Service: PopulateIssueIndexer", process.SystemProcessType, true)
defer finished()
for page := 1; ; page++ {
select {
case <-ctx.Done():
log.Warn("Issue Indexer population shutdown before completion")
return
default:
}
repos, _, err := repo_model.SearchRepositoryByName(ctx, &repo_model.SearchRepoOptions{
ListOptions: db_model.ListOptions{Page: page, PageSize: repo_model.RepositoryListDefaultPageSize},
OrderBy: db_model.SearchOrderByID,
Private: true,
Collaborate: util.OptionalBoolFalse,
})
if err != nil {
log.Error("SearchRepositoryByName: %v", err)
continue
}
if len(repos) == 0 {
log.Debug("Issue Indexer population complete")
return
}
for _, repo := range repos {
select {
case <-ctx.Done():
log.Info("Issue Indexer population shutdown before completion")
return
default:
}
UpdateRepoIndexer(ctx, repo)
}
}
}
// UpdateRepoIndexer add/update all issues of the repositories
func UpdateRepoIndexer(ctx context.Context, repo *repo_model.Repository) {
is, err := issues_model.Issues(ctx, &issues_model.IssuesOptions{
RepoIDs: []int64{repo.ID},
IsClosed: util.OptionalBoolNone,
IsPull: util.OptionalBoolNone,
})
if err != nil {
log.Error("Issues: %v", err)
return
}
if err = issues_model.IssueList(is).LoadDiscussComments(ctx); err != nil {
log.Error("LoadDiscussComments: %v", err)
return
}
for _, issue := range is {
UpdateIssueIndexer(issue)
}
}
// UpdateIssueIndexer add/update an issue to the issue indexer
func UpdateIssueIndexer(issue *issues_model.Issue) {
var comments []string
for _, comment := range issue.Comments {
if comment.Type == issues_model.CommentTypeComment {
comments = append(comments, comment.Content)
}
}
indexerData := &internal.IndexerData{
ID: issue.ID,
RepoID: issue.RepoID,
Title: issue.Title,
Content: issue.Content,
Comments: comments,
}
log.Debug("Adding to channel: %v", indexerData)
if err := issueIndexerQueue.Push(indexerData); err != nil {
log.Error("Unable to push to issue indexer: %v: Error: %v", indexerData, err)
}
}
// DeleteRepoIssueIndexer deletes repo's all issues indexes
func DeleteRepoIssueIndexer(ctx context.Context, repo *repo_model.Repository) {
var ids []int64
ids, err := issues_model.GetIssueIDsByRepoID(ctx, repo.ID)
if err != nil {
log.Error("GetIssueIDsByRepoID failed: %v", err)
return
}
if len(ids) == 0 {
return
}
indexerData := &internal.IndexerData{
IDs: ids,
IsDelete: true,
}
if err := issueIndexerQueue.Push(indexerData); err != nil {
log.Error("Unable to push to issue indexer: %v: Error: %v", indexerData, err)
}
}
// SearchIssuesByKeyword search issue ids by keywords and repo id
// WARNNING: You have to ensure user have permission to visit repoIDs' issues
func SearchIssuesByKeyword(ctx context.Context, repoIDs []int64, keyword string) ([]int64, error) {
var issueIDs []int64
indexer := *globalIndexer.Load()
res, err := indexer.Search(ctx, keyword, repoIDs, 50, 0)
if err != nil {
return nil, err
}
for _, r := range res.Hits {
issueIDs = append(issueIDs, r.ID)
}
return issueIDs, nil
}
// IsAvailable checks if issue indexer is available
func IsAvailable(ctx context.Context) bool {
return (*globalIndexer.Load()).Ping(ctx) == nil
}