139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"sync"
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"time"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/nosql"
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"github.com/redis/go-redis/v9"
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)
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type baseRedis struct {
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client redis.UniversalClient
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isUnique bool
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cfg *BaseConfig
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mu sync.Mutex // the old implementation is not thread-safe, the queue operation and set operation should be protected together
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}
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var _ baseQueue = (*baseRedis)(nil)
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func newBaseRedisGeneric(cfg *BaseConfig, unique bool) (baseQueue, error) {
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client := nosql.GetManager().GetRedisClient(cfg.ConnStr)
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var err error
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for i := 0; i < 10; i++ {
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err = client.Ping(graceful.GetManager().ShutdownContext()).Err()
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if err == nil {
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break
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}
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log.Warn("Redis is not ready, waiting for 1 second to retry: %v", err)
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time.Sleep(time.Second)
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}
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if err != nil {
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return nil, err
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}
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return &baseRedis{cfg: cfg, client: client, isUnique: unique}, nil
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}
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func newBaseRedisSimple(cfg *BaseConfig) (baseQueue, error) {
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return newBaseRedisGeneric(cfg, false)
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}
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func newBaseRedisUnique(cfg *BaseConfig) (baseQueue, error) {
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return newBaseRedisGeneric(cfg, true)
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}
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func (q *baseRedis) PushItem(ctx context.Context, data []byte) error {
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return backoffErr(ctx, backoffBegin, backoffUpper, time.After(pushBlockTime), func() (retry bool, err error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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cnt, err := q.client.LLen(ctx, q.cfg.QueueFullName).Result()
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if err != nil {
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return false, err
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}
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if int(cnt) >= q.cfg.Length {
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return true, nil
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}
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if q.isUnique {
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added, err := q.client.SAdd(ctx, q.cfg.SetFullName, data).Result()
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if err != nil {
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return false, err
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}
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if added == 0 {
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return false, ErrAlreadyInQueue
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}
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}
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return false, q.client.RPush(ctx, q.cfg.QueueFullName, data).Err()
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})
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}
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func (q *baseRedis) PopItem(ctx context.Context) ([]byte, error) {
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return backoffRetErr(ctx, backoffBegin, backoffUpper, infiniteTimerC, func() (retry bool, data []byte, err error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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data, err = q.client.LPop(ctx, q.cfg.QueueFullName).Bytes()
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if err == redis.Nil {
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return true, nil, nil
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}
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if err != nil {
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return true, nil, nil
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}
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if q.isUnique {
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// the data has been popped, even if there is any error we can't do anything
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_ = q.client.SRem(ctx, q.cfg.SetFullName, data).Err()
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}
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return false, data, err
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})
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}
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func (q *baseRedis) HasItem(ctx context.Context, data []byte) (bool, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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if !q.isUnique {
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return false, nil
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}
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return q.client.SIsMember(ctx, q.cfg.SetFullName, data).Result()
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}
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func (q *baseRedis) Len(ctx context.Context) (int, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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cnt, err := q.client.LLen(ctx, q.cfg.QueueFullName).Result()
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return int(cnt), err
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}
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func (q *baseRedis) Close() error {
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q.mu.Lock()
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defer q.mu.Unlock()
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return q.client.Close()
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}
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func (q *baseRedis) RemoveAll(ctx context.Context) error {
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q.mu.Lock()
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defer q.mu.Unlock()
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c1 := q.client.Del(ctx, q.cfg.QueueFullName)
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// the "set" must be cleared after the "list" because there is no transaction.
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// it's better to have duplicate items than losing items.
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c2 := q.client.Del(ctx, q.cfg.SetFullName)
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if c1.Err() != nil {
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return c1.Err()
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}
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if c2.Err() != nil {
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return c2.Err()
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}
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return nil // actually, checking errors doesn't make sense here because the state could be out-of-sync
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}
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