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// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package issues
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import (
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"context"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/meilisearch/meilisearch-go"
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)
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var _ Indexer = &MeilisearchIndexer{}
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// MeilisearchIndexer implements Indexer interface
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type MeilisearchIndexer struct {
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Rewrite queue (#24505)
# ⚠️ Breaking
Many deprecated queue config options are removed (actually, they should
have been removed in 1.18/1.19).
If you see the fatal message when starting Gitea: "Please update your
app.ini to remove deprecated config options", please follow the error
messages to remove these options from your app.ini.
Example:
```
2023/05/06 19:39:22 [E] Removed queue option: `[indexer].ISSUE_INDEXER_QUEUE_TYPE`. Use new options in `[queue.issue_indexer]`
2023/05/06 19:39:22 [E] Removed queue option: `[indexer].UPDATE_BUFFER_LEN`. Use new options in `[queue.issue_indexer]`
2023/05/06 19:39:22 [F] Please update your app.ini to remove deprecated config options
```
Many options in `[queue]` are are dropped, including:
`WRAP_IF_NECESSARY`, `MAX_ATTEMPTS`, `TIMEOUT`, `WORKERS`,
`BLOCK_TIMEOUT`, `BOOST_TIMEOUT`, `BOOST_WORKERS`, they can be removed
from app.ini.
# The problem
The old queue package has some legacy problems:
* complexity: I doubt few people could tell how it works.
* maintainability: Too many channels and mutex/cond are mixed together,
too many different structs/interfaces depends each other.
* stability: due to the complexity & maintainability, sometimes there
are strange bugs and difficult to debug, and some code doesn't have test
(indeed some code is difficult to test because a lot of things are mixed
together).
* general applicability: although it is called "queue", its behavior is
not a well-known queue.
* scalability: it doesn't seem easy to make it work with a cluster
without breaking its behaviors.
It came from some very old code to "avoid breaking", however, its
technical debt is too heavy now. It's a good time to introduce a better
"queue" package.
# The new queue package
It keeps using old config and concept as much as possible.
* It only contains two major kinds of concepts:
* The "base queue": channel, levelqueue, redis
* They have the same abstraction, the same interface, and they are
tested by the same testing code.
* The "WokerPoolQueue", it uses the "base queue" to provide "worker
pool" function, calls the "handler" to process the data in the base
queue.
* The new code doesn't do "PushBack"
* Think about a queue with many workers, the "PushBack" can't guarantee
the order for re-queued unhandled items, so in new code it just does
"normal push"
* The new code doesn't do "pause/resume"
* The "pause/resume" was designed to handle some handler's failure: eg:
document indexer (elasticsearch) is down
* If a queue is paused for long time, either the producers blocks or the
new items are dropped.
* The new code doesn't do such "pause/resume" trick, it's not a common
queue's behavior and it doesn't help much.
* If there are unhandled items, the "push" function just blocks for a
few seconds and then re-queue them and retry.
* The new code doesn't do "worker booster"
* Gitea's queue's handlers are light functions, the cost is only the
go-routine, so it doesn't make sense to "boost" them.
* The new code only use "max worker number" to limit the concurrent
workers.
* The new "Push" never blocks forever
* Instead of creating more and more blocking goroutines, return an error
is more friendly to the server and to the end user.
There are more details in code comments: eg: the "Flush" problem, the
strange "code.index" hanging problem, the "immediate" queue problem.
Almost ready for review.
TODO:
* [x] add some necessary comments during review
* [x] add some more tests if necessary
* [x] update documents and config options
* [x] test max worker / active worker
* [x] re-run the CI tasks to see whether any test is flaky
* [x] improve the `handleOldLengthConfiguration` to provide more
friendly messages
* [x] fine tune default config values (eg: length?)
## Code coverage:
![image](https://user-images.githubusercontent.com/2114189/236620635-55576955-f95d-4810-b12f-879026a3afdf.png)
2 years ago
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client *meilisearch.Client
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indexerName string
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available bool
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stopTimer chan struct{}
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lock sync.RWMutex
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}
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// MeilisearchIndexer creates a new meilisearch indexer
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func NewMeilisearchIndexer(url, apiKey, indexerName string) (*MeilisearchIndexer, error) {
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client := meilisearch.NewClient(meilisearch.ClientConfig{
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Host: url,
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APIKey: apiKey,
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})
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indexer := &MeilisearchIndexer{
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client: client,
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indexerName: indexerName,
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available: true,
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stopTimer: make(chan struct{}),
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}
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ticker := time.NewTicker(10 * time.Second)
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go func() {
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for {
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select {
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case <-ticker.C:
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indexer.checkAvailability()
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case <-indexer.stopTimer:
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ticker.Stop()
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return
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}
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}
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}()
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return indexer, nil
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}
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// Init will initialize the indexer
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func (b *MeilisearchIndexer) Init() (bool, error) {
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_, err := b.client.GetIndex(b.indexerName)
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if err == nil {
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return true, nil
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}
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_, err = b.client.CreateIndex(&meilisearch.IndexConfig{
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Uid: b.indexerName,
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PrimaryKey: "id",
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})
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if err != nil {
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return false, b.checkError(err)
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}
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_, err = b.client.Index(b.indexerName).UpdateFilterableAttributes(&[]string{"repo_id"})
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return false, b.checkError(err)
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}
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// Ping checks if meilisearch is available
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func (b *MeilisearchIndexer) Ping() bool {
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b.lock.RLock()
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defer b.lock.RUnlock()
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return b.available
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}
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// Index will save the index data
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func (b *MeilisearchIndexer) Index(issues []*IndexerData) error {
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if len(issues) == 0 {
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return nil
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}
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for _, issue := range issues {
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_, err := b.client.Index(b.indexerName).AddDocuments(issue)
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if err != nil {
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return b.checkError(err)
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}
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}
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// TODO: bulk send index data
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return nil
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}
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// Delete deletes indexes by ids
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func (b *MeilisearchIndexer) Delete(ids ...int64) error {
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if len(ids) == 0 {
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return nil
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}
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for _, id := range ids {
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_, err := b.client.Index(b.indexerName).DeleteDocument(strconv.FormatInt(id, 10))
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if err != nil {
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return b.checkError(err)
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}
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}
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// TODO: bulk send deletes
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return nil
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}
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// Search searches for issues by given conditions.
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// Returns the matching issue IDs
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func (b *MeilisearchIndexer) Search(ctx context.Context, keyword string, repoIDs []int64, limit, start int) (*SearchResult, error) {
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repoFilters := make([]string, 0, len(repoIDs))
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for _, repoID := range repoIDs {
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repoFilters = append(repoFilters, "repo_id = "+strconv.FormatInt(repoID, 10))
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}
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filter := strings.Join(repoFilters, " OR ")
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searchRes, err := b.client.Index(b.indexerName).Search(keyword, &meilisearch.SearchRequest{
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Filter: filter,
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Limit: int64(limit),
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Offset: int64(start),
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})
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if err != nil {
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return nil, b.checkError(err)
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}
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hits := make([]Match, 0, len(searchRes.Hits))
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for _, hit := range searchRes.Hits {
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hits = append(hits, Match{
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ID: int64(hit.(map[string]interface{})["id"].(float64)),
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})
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}
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return &SearchResult{
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Total: searchRes.TotalHits,
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Hits: hits,
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}, nil
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}
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// Close implements indexer
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func (b *MeilisearchIndexer) Close() {
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select {
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case <-b.stopTimer:
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default:
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close(b.stopTimer)
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}
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}
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func (b *MeilisearchIndexer) checkError(err error) error {
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return err
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}
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func (b *MeilisearchIndexer) checkAvailability() {
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_, err := b.client.Health()
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if err != nil {
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b.setAvailability(false)
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return
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}
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b.setAvailability(true)
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}
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func (b *MeilisearchIndexer) setAvailability(available bool) {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.available == available {
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return
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}
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b.available = available
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}
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