// Copyright 2017 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package cache import (	"errors"	"fmt"	"strconv"	"time" 	"forgejo.org/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 servicefunc 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, errors.New("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, errors.New("expect cache hit but got none")	}	if testVal != testData {		return 0, errors.New("expect cache to return same value as stored but got other")	} 	return time.Since(start), nil} // GetCache returns the currently configured cachefunc GetCache() mc.Cache {	return conn} // GetString returns the key value from cache with callback when no key exists in cachefunc 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 cachefunc 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 cachefunc 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 cachefunc Remove(key string) {	if conn == nil {		return	}	_ = conn.Delete(key)}