forgejo-federation/modules/indexer/code/elastic_search.go
wxiaoguang 4647660776
Rewrite logger system (#24726)
## ⚠️ Breaking

The `log.<mode>.<logger>` style config has been dropped. If you used it,
please check the new config manual & app.example.ini to make your
instance output logs as expected.

Although many legacy options still work, it's encouraged to upgrade to
the new options.

The SMTP logger is deleted because SMTP is not suitable to collect logs.

If you have manually configured Gitea log options, please confirm the
logger system works as expected after upgrading.

## Description

Close #12082 and maybe more log-related issues, resolve some related
FIXMEs in old code (which seems unfixable before)

Just like rewriting queue #24505 : make code maintainable, clear legacy
bugs, and add the ability to support more writers (eg: JSON, structured
log)

There is a new document (with examples): `logging-config.en-us.md`

This PR is safer than the queue rewriting, because it's just for
logging, it won't break other logic.

## The old problems

The logging system is quite old and difficult to maintain:
* Unclear concepts: Logger, NamedLogger, MultiChannelledLogger,
SubLogger, EventLogger, WriterLogger etc
* Some code is diffuclt to konw whether it is right:
`log.DelNamedLogger("console")` vs `log.DelNamedLogger(log.DEFAULT)` vs
`log.DelLogger("console")`
* The old system heavily depends on ini config system, it's difficult to
create new logger for different purpose, and it's very fragile.
* The "color" trick is difficult to use and read, many colors are
unnecessary, and in the future structured log could help
* It's difficult to add other log formats, eg: JSON format
* The log outputer doesn't have full control of its goroutine, it's
difficult to make outputer have advanced behaviors
* The logs could be lost in some cases: eg: no Fatal error when using
CLI.
* Config options are passed by JSON, which is quite fragile.
* INI package makes the KEY in `[log]` section visible in `[log.sub1]`
and `[log.sub1.subA]`, this behavior is quite fragile and would cause
more unclear problems, and there is no strong requirement to support
`log.<mode>.<logger>` syntax.


## The new design

See `logger.go` for documents.


## Screenshot

<details>


![image](https://github.com/go-gitea/gitea/assets/2114189/4462d713-ba39-41f5-bb08-de912e67e1ff)


![image](https://github.com/go-gitea/gitea/assets/2114189/b188035e-f691-428b-8b2d-ff7b2199b2f9)


![image](https://github.com/go-gitea/gitea/assets/2114189/132e9745-1c3b-4e00-9e0d-15eaea495dee)

</details>

## TODO

* [x] add some new tests
* [x] fix some tests
* [x] test some sub-commands (manually ....)

---------

Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Giteabot <teabot@gitea.io>
2023-05-21 22:35:11 +00:00

512 lines
14 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package code
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"net"
"strconv"
"strings"
"sync"
"time"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/analyze"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/typesniffer"
"github.com/go-enry/go-enry/v2"
"github.com/olivere/elastic/v7"
)
const (
esRepoIndexerLatestVersion = 1
// multi-match-types, currently only 2 types are used
// Reference: https://www.elastic.co/guide/en/elasticsearch/reference/7.0/query-dsl-multi-match-query.html#multi-match-types
esMultiMatchTypeBestFields = "best_fields"
esMultiMatchTypePhrasePrefix = "phrase_prefix"
)
var _ Indexer = &ElasticSearchIndexer{}
// ElasticSearchIndexer implements Indexer interface
type ElasticSearchIndexer struct {
client *elastic.Client
indexerAliasName string
available bool
stopTimer chan struct{}
lock sync.RWMutex
}
// NewElasticSearchIndexer creates a new elasticsearch indexer
func NewElasticSearchIndexer(url, indexerName string) (*ElasticSearchIndexer, bool, error) {
opts := []elastic.ClientOptionFunc{
elastic.SetURL(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}))
client, err := elastic.NewClient(opts...)
if err != nil {
return nil, false, err
}
indexer := &ElasticSearchIndexer{
client: client,
indexerAliasName: indexerName,
available: true,
stopTimer: make(chan struct{}),
}
ticker := time.NewTicker(10 * time.Second)
go func() {
for {
select {
case <-ticker.C:
indexer.checkAvailability()
case <-indexer.stopTimer:
ticker.Stop()
return
}
}
}()
exists, err := indexer.init()
if err != nil {
indexer.Close()
return nil, false, err
}
return indexer, !exists, err
}
const (
defaultMapping = `{
"mappings": {
"properties": {
"repo_id": {
"type": "long",
"index": true
},
"content": {
"type": "text",
"term_vector": "with_positions_offsets",
"index": true
},
"commit_id": {
"type": "keyword",
"index": true
},
"language": {
"type": "keyword",
"index": true
},
"updated_at": {
"type": "long",
"index": true
}
}
}
}`
)
func (b *ElasticSearchIndexer) realIndexerName() string {
return fmt.Sprintf("%s.v%d", b.indexerAliasName, esRepoIndexerLatestVersion)
}
// Init will initialize the indexer
func (b *ElasticSearchIndexer) init() (bool, error) {
ctx := graceful.GetManager().HammerContext()
exists, err := b.client.IndexExists(b.realIndexerName()).Do(ctx)
if err != nil {
return false, b.checkError(err)
}
if !exists {
mapping := defaultMapping
createIndex, err := b.client.CreateIndex(b.realIndexerName()).BodyString(mapping).Do(ctx)
if err != nil {
return false, b.checkError(err)
}
if !createIndex.Acknowledged {
return false, fmt.Errorf("create index %s with %s failed", b.realIndexerName(), mapping)
}
}
// check version
r, err := b.client.Aliases().Do(ctx)
if err != nil {
return false, b.checkError(err)
}
realIndexerNames := r.IndicesByAlias(b.indexerAliasName)
if len(realIndexerNames) < 1 {
res, err := b.client.Alias().
Add(b.realIndexerName(), b.indexerAliasName).
Do(ctx)
if err != nil {
return false, b.checkError(err)
}
if !res.Acknowledged {
return false, fmt.Errorf("create alias %s to index %s failed", b.indexerAliasName, b.realIndexerName())
}
} else if len(realIndexerNames) >= 1 && realIndexerNames[0] < b.realIndexerName() {
log.Warn("Found older gitea indexer named %s, but we will create a new one %s and keep the old NOT DELETED. You can delete the old version after the upgrade succeed.",
realIndexerNames[0], b.realIndexerName())
res, err := b.client.Alias().
Remove(realIndexerNames[0], b.indexerAliasName).
Add(b.realIndexerName(), b.indexerAliasName).
Do(ctx)
if err != nil {
return false, b.checkError(err)
}
if !res.Acknowledged {
return false, fmt.Errorf("change alias %s to index %s failed", b.indexerAliasName, b.realIndexerName())
}
}
return exists, nil
}
// Ping checks if elastic is available
func (b *ElasticSearchIndexer) Ping() bool {
b.lock.RLock()
defer b.lock.RUnlock()
return b.available
}
func (b *ElasticSearchIndexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, sha string, update fileUpdate, repo *repo_model.Repository) ([]elastic.BulkableRequest, error) {
// Ignore vendored files in code search
if setting.Indexer.ExcludeVendored && analyze.IsVendor(update.Filename) {
return nil, nil
}
size := update.Size
var err error
if !update.Sized {
var stdout string
stdout, _, err = git.NewCommand(ctx, "cat-file", "-s").AddDynamicArguments(update.BlobSha).RunStdString(&git.RunOpts{Dir: repo.RepoPath()})
if err != nil {
return nil, err
}
if size, err = strconv.ParseInt(strings.TrimSpace(stdout), 10, 64); err != nil {
return nil, fmt.Errorf("misformatted git cat-file output: %w", err)
}
}
if size > setting.Indexer.MaxIndexerFileSize {
return []elastic.BulkableRequest{b.addDelete(update.Filename, repo)}, nil
}
if _, err := batchWriter.Write([]byte(update.BlobSha + "\n")); err != nil {
return nil, err
}
_, _, size, err = git.ReadBatchLine(batchReader)
if err != nil {
return nil, err
}
fileContents, err := io.ReadAll(io.LimitReader(batchReader, size))
if err != nil {
return nil, err
} else if !typesniffer.DetectContentType(fileContents).IsText() {
// FIXME: UTF-16 files will probably fail here
return nil, nil
}
if _, err = batchReader.Discard(1); err != nil {
return nil, err
}
id := filenameIndexerID(repo.ID, update.Filename)
return []elastic.BulkableRequest{
elastic.NewBulkIndexRequest().
Index(b.indexerAliasName).
Id(id).
Doc(map[string]interface{}{
"repo_id": repo.ID,
"content": string(charset.ToUTF8DropErrors(fileContents)),
"commit_id": sha,
"language": analyze.GetCodeLanguage(update.Filename, fileContents),
"updated_at": timeutil.TimeStampNow(),
}),
}, nil
}
func (b *ElasticSearchIndexer) addDelete(filename string, repo *repo_model.Repository) elastic.BulkableRequest {
id := filenameIndexerID(repo.ID, filename)
return elastic.NewBulkDeleteRequest().
Index(b.indexerAliasName).
Id(id)
}
// Index will save the index data
func (b *ElasticSearchIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *repoChanges) error {
reqs := make([]elastic.BulkableRequest, 0)
if len(changes.Updates) > 0 {
// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
if err := git.EnsureValidGitRepository(ctx, repo.RepoPath()); err != nil {
log.Error("Unable to open git repo: %s for %-v: %v", repo.RepoPath(), repo, err)
return err
}
batchWriter, batchReader, cancel := git.CatFileBatch(ctx, repo.RepoPath())
defer cancel()
for _, update := range changes.Updates {
updateReqs, err := b.addUpdate(ctx, batchWriter, batchReader, sha, update, repo)
if err != nil {
return err
}
if len(updateReqs) > 0 {
reqs = append(reqs, updateReqs...)
}
}
cancel()
}
for _, filename := range changes.RemovedFilenames {
reqs = append(reqs, b.addDelete(filename, repo))
}
if len(reqs) > 0 {
_, err := b.client.Bulk().
Index(b.indexerAliasName).
Add(reqs...).
Do(ctx)
return b.checkError(err)
}
return nil
}
// Delete deletes indexes by ids
func (b *ElasticSearchIndexer) Delete(repoID int64) error {
_, err := b.client.DeleteByQuery(b.indexerAliasName).
Query(elastic.NewTermsQuery("repo_id", repoID)).
Do(graceful.GetManager().HammerContext())
return b.checkError(err)
}
// indexPos find words positions for start and the following end on content. It will
// return the beginning position of the first start and the ending position of the
// first end following the start string.
// If not found any of the positions, it will return -1, -1.
func indexPos(content, start, end string) (int, int) {
startIdx := strings.Index(content, start)
if startIdx < 0 {
return -1, -1
}
endIdx := strings.Index(content[startIdx+len(start):], end)
if endIdx < 0 {
return -1, -1
}
return startIdx, startIdx + len(start) + endIdx + len(end)
}
func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int) (int64, []*SearchResult, []*SearchResultLanguages, error) {
hits := make([]*SearchResult, 0, pageSize)
for _, hit := range searchResult.Hits.Hits {
// FIXME: There is no way to get the position the keyword on the content currently on the same request.
// So we get it from content, this may made the query slower. See
// https://discuss.elastic.co/t/fetching-position-of-keyword-in-matched-document/94291
var startIndex, endIndex int
c, ok := hit.Highlight["content"]
if ok && len(c) > 0 {
// FIXME: Since the highlighting content will include <em> and </em> for the keywords,
// now we should find the positions. But how to avoid html content which contains the
// <em> and </em> tags? If elastic search has handled that?
startIndex, endIndex = indexPos(c[0], "<em>", "</em>")
if startIndex == -1 {
panic(fmt.Sprintf("1===%s,,,%#v,,,%s", kw, hit.Highlight, c[0]))
}
} else {
panic(fmt.Sprintf("2===%#v", hit.Highlight))
}
repoID, fileName := parseIndexerID(hit.Id)
res := make(map[string]interface{})
if err := json.Unmarshal(hit.Source, &res); err != nil {
return 0, nil, nil, err
}
language := res["language"].(string)
hits = append(hits, &SearchResult{
RepoID: repoID,
Filename: fileName,
CommitID: res["commit_id"].(string),
Content: res["content"].(string),
UpdatedUnix: timeutil.TimeStamp(res["updated_at"].(float64)),
Language: language,
StartIndex: startIndex,
EndIndex: endIndex - 9, // remove the length <em></em> since we give Content the original data
Color: enry.GetColor(language),
})
}
return searchResult.TotalHits(), hits, extractAggs(searchResult), nil
}
func extractAggs(searchResult *elastic.SearchResult) []*SearchResultLanguages {
var searchResultLanguages []*SearchResultLanguages
agg, found := searchResult.Aggregations.Terms("language")
if found {
searchResultLanguages = make([]*SearchResultLanguages, 0, 10)
for _, bucket := range agg.Buckets {
searchResultLanguages = append(searchResultLanguages, &SearchResultLanguages{
Language: bucket.Key.(string),
Color: enry.GetColor(bucket.Key.(string)),
Count: int(bucket.DocCount),
})
}
}
return searchResultLanguages
}
// Search searches for codes and language stats by given conditions.
func (b *ElasticSearchIndexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error) {
searchType := esMultiMatchTypeBestFields
if isMatch {
searchType = esMultiMatchTypePhrasePrefix
}
kwQuery := elastic.NewMultiMatchQuery(keyword, "content").Type(searchType)
query := elastic.NewBoolQuery()
query = query.Must(kwQuery)
if len(repoIDs) > 0 {
repoStrs := make([]interface{}, 0, len(repoIDs))
for _, repoID := range repoIDs {
repoStrs = append(repoStrs, repoID)
}
repoQuery := elastic.NewTermsQuery("repo_id", repoStrs...)
query = query.Must(repoQuery)
}
var (
start int
kw = "<em>" + keyword + "</em>"
aggregation = elastic.NewTermsAggregation().Field("language").Size(10).OrderByCountDesc()
)
if page > 0 {
start = (page - 1) * pageSize
}
if len(language) == 0 {
searchResult, err := b.client.Search().
Index(b.indexerAliasName).
Aggregation("language", aggregation).
Query(query).
Highlight(
elastic.NewHighlight().
Field("content").
NumOfFragments(0). // return all highting content on fragments
HighlighterType("fvh"),
).
Sort("repo_id", true).
From(start).Size(pageSize).
Do(ctx)
if err != nil {
return 0, nil, nil, b.checkError(err)
}
return convertResult(searchResult, kw, pageSize)
}
langQuery := elastic.NewMatchQuery("language", language)
countResult, err := b.client.Search().
Index(b.indexerAliasName).
Aggregation("language", aggregation).
Query(query).
Size(0). // We only needs stats information
Do(ctx)
if err != nil {
return 0, nil, nil, b.checkError(err)
}
query = query.Must(langQuery)
searchResult, err := b.client.Search().
Index(b.indexerAliasName).
Query(query).
Highlight(
elastic.NewHighlight().
Field("content").
NumOfFragments(0). // return all highting content on fragments
HighlighterType("fvh"),
).
Sort("repo_id", true).
From(start).Size(pageSize).
Do(ctx)
if err != nil {
return 0, nil, nil, b.checkError(err)
}
total, hits, _, err := convertResult(searchResult, kw, pageSize)
return total, hits, extractAggs(countResult), err
}
// Close implements indexer
func (b *ElasticSearchIndexer) Close() {
select {
case <-b.stopTimer:
default:
close(b.stopTimer)
}
}
func (b *ElasticSearchIndexer) checkError(err error) error {
var opErr *net.OpError
if !(elastic.IsConnErr(err) || (errors.As(err, &opErr) && (opErr.Op == "dial" || opErr.Op == "read"))) {
return err
}
b.setAvailability(false)
return err
}
func (b *ElasticSearchIndexer) checkAvailability() {
if b.Ping() {
return
}
// Request cluster state to check if elastic is available again
_, err := b.client.ClusterState().Do(graceful.GetManager().ShutdownContext())
if err != nil {
b.setAvailability(false)
return
}
b.setAvailability(true)
}
func (b *ElasticSearchIndexer) setAvailability(available bool) {
b.lock.Lock()
defer b.lock.Unlock()
if b.available == available {
return
}
b.available = available
}