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// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package cache
import (
"fmt"
"strconv"
"time"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/nosql"
"code.forgejo.org/go-chi/cache"
)
// RedisCacher represents a redis cache adapter implementation.
type RedisCacher struct {
c nosql.RedisClient
prefix string
hsetName string
occupyMode bool
}
// toStr convert string/int/int64 interface to string. it's only used by the RedisCacher.Put internally
func toStr(v any) string {
if v == nil {
return ""
}
switch v := v.(type) {
case string:
return v
case []byte:
return string(v)
case int:
return strconv.FormatInt(int64(v), 10)
case int64:
return strconv.FormatInt(v, 10)
default:
return fmt.Sprint(v) // as what the old com.ToStr does in most cases
}
}
// Put puts value (string type) into cache with key and expire time.
// If expired is 0, it lives forever.
func (c *RedisCacher) Put(key string, val any, expire int64) error {
// this function is not well-designed, it only puts string values into cache
key = c.prefix + key
if expire == 0 {
if err := c.c.Set(graceful.GetManager().HammerContext(), key, toStr(val), 0).Err(); err != nil {
return err
}
} else {
dur := time.Duration(expire) * time.Second
if err := c.c.Set(graceful.GetManager().HammerContext(), key, toStr(val), dur).Err(); err != nil {
return err
}
}
if c.occupyMode {
return nil
}
return c.c.HSet(graceful.GetManager().HammerContext(), c.hsetName, key, "0").Err()
}
// Get gets cached value by given key.
func (c *RedisCacher) Get(key string) any {
val, err := c.c.Get(graceful.GetManager().HammerContext(), c.prefix+key).Result()
if err != nil {
return nil
}
return val
}
// Delete deletes cached value by given key.
func (c *RedisCacher) Delete(key string) error {
key = c.prefix + key
if err := c.c.Del(graceful.GetManager().HammerContext(), key).Err(); err != nil {
return err
}
if c.occupyMode {
return nil
}
return c.c.HDel(graceful.GetManager().HammerContext(), c.hsetName, key).Err()
}
// Incr increases cached int-type value by given key as a counter.
func (c *RedisCacher) Incr(key string) error {
if !c.IsExist(key) {
return fmt.Errorf("key '%s' not exist", key)
}
return c.c.Incr(graceful.GetManager().HammerContext(), c.prefix+key).Err()
}
// Decr decreases cached int-type value by given key as a counter.
func (c *RedisCacher) Decr(key string) error {
if !c.IsExist(key) {
return fmt.Errorf("key '%s' not exist", key)
}
return c.c.Decr(graceful.GetManager().HammerContext(), c.prefix+key).Err()
}
// IsExist returns true if cached value exists.
func (c *RedisCacher) IsExist(key string) bool {
if c.c.Exists(graceful.GetManager().HammerContext(), c.prefix+key).Val() == 1 {
return true
}
if !c.occupyMode {
c.c.HDel(graceful.GetManager().HammerContext(), c.hsetName, c.prefix+key)
}
return false
}
// Flush deletes all cached data.
func (c *RedisCacher) Flush() error {
if c.occupyMode {
return c.c.FlushDB(graceful.GetManager().HammerContext()).Err()
}
keys, err := c.c.HKeys(graceful.GetManager().HammerContext(), c.hsetName).Result()
if err != nil {
return err
}
if err = c.c.Del(graceful.GetManager().HammerContext(), keys...).Err(); err != nil {
return err
}
return c.c.Del(graceful.GetManager().HammerContext(), c.hsetName).Err()
}
// StartAndGC starts GC routine based on config string settings.
// AdapterConfig: network=tcp,addr=:6379,password=macaron,db=0,pool_size=100,idle_timeout=180,hset_name=MacaronCache,prefix=cache:
func (c *RedisCacher) StartAndGC(opts cache.Options) error {
c.hsetName = "MacaronCache"
c.occupyMode = opts.OccupyMode
uri := nosql.ToRedisURI(opts.AdapterConfig)
c.c = nosql.GetManager().GetRedisClient(uri.String())
for k, v := range uri.Query() {
switch k {
case "hset_name":
c.hsetName = v[0]
case "prefix":
c.prefix = v[0]
}
}
return c.c.Ping(graceful.GetManager().HammerContext()).Err()
}
// Ping tests if the cache is alive.
func (c *RedisCacher) Ping() error {
return c.c.Ping(graceful.GetManager().HammerContext()).Err()
}
func init() {
cache.Register("redis", &RedisCacher{})
}
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