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