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// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package cache
import (
"fmt"
"strconv"
"time"
"code.gitea.io/gitea/modules/setting"
mc "code.forgejo.org/go-chi/cache"
_ "code.forgejo.org/go-chi/cache/memcache" // memcache plugin for cache
)
var conn mc.Cache
func newCache(cacheConfig setting.Cache) (mc.Cache, error) {
return mc.NewCacher(mc.Options{
Adapter: cacheConfig.Adapter,
AdapterConfig: cacheConfig.Conn,
Interval: cacheConfig.Interval,
})
}
// Init start cache service
func Init() error {
var err error
if conn == nil {
if conn, err = newCache(setting.CacheService.Cache); err != nil {
return err
}
if err = conn.Ping(); err != nil {
return err
}
}
return err
}
const (
testCacheKey = "DefaultCache.TestKey"
SlowCacheThreshold = 100 * time.Microsecond
)
func Test() (time.Duration, error) {
if conn == nil {
return 0, fmt.Errorf("default cache not initialized")
}
testData := fmt.Sprintf("%x", make([]byte, 500))
start := time.Now()
if err := conn.Delete(testCacheKey); err != nil {
return 0, fmt.Errorf("expect cache to delete data based on key if exist but got: %w", err)
}
if err := conn.Put(testCacheKey, testData, 10); err != nil {
return 0, fmt.Errorf("expect cache to store data but got: %w", err)
}
testVal := conn.Get(testCacheKey)
if testVal == nil {
return 0, fmt.Errorf("expect cache hit but got none")
}
if testVal != testData {
return 0, fmt.Errorf("expect cache to return same value as stored but got other")
}
return time.Since(start), nil
}
// GetCache returns the currently configured cache
func GetCache() mc.Cache {
return conn
}
// GetString returns the key value from cache with callback when no key exists in cache
func GetString(key string, getFunc func() (string, error)) (string, error) {
if conn == nil || setting.CacheService.TTL == 0 {
return getFunc()
}
cached := conn.Get(key)
if cached == nil {
value, err := getFunc()
if err != nil {
return value, err
}
return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
}
if value, ok := cached.(string); ok {
return value, nil
}
if stringer, ok := cached.(fmt.Stringer); ok {
return stringer.String(), nil
}
return fmt.Sprintf("%s", cached), nil
}
// GetInt returns key value from cache with callback when no key exists in cache
func GetInt(key string, getFunc func() (int, error)) (int, error) {
if conn == nil || setting.CacheService.TTL == 0 {
return getFunc()
}
cached := conn.Get(key)
if cached == nil {
value, err := getFunc()
if err != nil {
return value, err
}
return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
}
switch v := cached.(type) {
case int:
return v, nil
case string:
value, err := strconv.Atoi(v)
if err != nil {
return 0, err
}
return value, nil
default:
value, err := getFunc()
if err != nil {
return value, err
}
return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
}
}
// GetInt64 returns key value from cache with callback when no key exists in cache
func GetInt64(key string, getFunc func() (int64, error)) (int64, error) {
if conn == nil || setting.CacheService.TTL == 0 {
return getFunc()
}
cached := conn.Get(key)
if cached == nil {
value, err := getFunc()
if err != nil {
return value, err
}
return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
}
switch v := conn.Get(key).(type) {
case int64:
return v, nil
case string:
value, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return 0, err
}
return value, nil
default:
value, err := getFunc()
if err != nil {
return value, err
}
return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
}
}
// Remove key from cache
func Remove(key string) {
if conn == nil {
return
}
_ = conn.Delete(key)
}
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