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// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package cache
import (
"fmt"
"strconv"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
mc "gitea.com/go-chi/cache"
_ "gitea.com/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,
})
}
// NewContext start cache service
func NewContext() error {
var err error
if conn == nil && setting.CacheService.Enabled {
if conn, err = newCache(setting.CacheService.Cache); err != nil {
return err
}
const testKey = "__gitea_cache_test"
const testVal = "test-value"
if err = conn.Put(testKey, testVal, 10); err != nil {
return err
}
val := conn.Get(testKey)
if valStr, ok := val.(string); !ok || valStr != testVal {
// If the cache is full, the Get may not read the expected value stored by Put.
// Since we have checked that Put can success, so we just show a warning here, do not return an error to panic.
log.Warn("cache (adapter:%s, config:%s) doesn't seem to work correctly, set test value '%v' but get '%v'",
setting.CacheService.Cache.Adapter, setting.CacheService.Cache.Conn,
testVal, val,
)
}
}
return err
}
// 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()
}
if !conn.IsExist(key) {
var (
value string
err error
)
if value, err = getFunc(); err != nil {
return value, err
}
err = conn.Put(key, value, setting.CacheService.TTLSeconds())
if err != nil {
return "", err
}
}
value := conn.Get(key)
if v, ok := value.(string); ok {
return v, nil
}
if v, ok := value.(fmt.Stringer); ok {
return v.String(), nil
}
return fmt.Sprintf("%s", conn.Get(key)), 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()
}
if !conn.IsExist(key) {
var (
value int
err error
)
if value, err = getFunc(); err != nil {
return value, err
}
err = conn.Put(key, value, setting.CacheService.TTLSeconds())
if err != nil {
return 0, err
}
}
switch value := conn.Get(key).(type) {
case int:
return value, nil
case string:
v, err := strconv.Atoi(value)
if err != nil {
return 0, err
}
return v, nil
default:
return 0, fmt.Errorf("Unsupported cached value type: %v", value)
}
}
// 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()
}
if !conn.IsExist(key) {
var (
value int64
err error
)
if value, err = getFunc(); err != nil {
return value, err
}
err = conn.Put(key, value, setting.CacheService.TTLSeconds())
if err != nil {
return 0, err
}
}
switch value := conn.Get(key).(type) {
case int64:
return value, nil
case string:
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return 0, err
}
return v, nil
default:
return 0, fmt.Errorf("Unsupported cached value type: %v", value)
}
}
// Remove key from cache
func Remove(key string) {
if conn == nil {
return
}
_ = conn.Delete(key)
}
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