code.gitea.io/gitea@v1.19.3/modules/cache/cache.go (about)

     1  // Copyright 2017 The Gitea Authors. All rights reserved.
     2  // SPDX-License-Identifier: MIT
     3  
     4  package cache
     5  
     6  import (
     7  	"fmt"
     8  	"strconv"
     9  
    10  	"code.gitea.io/gitea/modules/setting"
    11  
    12  	mc "gitea.com/go-chi/cache"
    13  
    14  	_ "gitea.com/go-chi/cache/memcache" // memcache plugin for cache
    15  )
    16  
    17  var conn mc.Cache
    18  
    19  func newCache(cacheConfig setting.Cache) (mc.Cache, error) {
    20  	return mc.NewCacher(mc.Options{
    21  		Adapter:       cacheConfig.Adapter,
    22  		AdapterConfig: cacheConfig.Conn,
    23  		Interval:      cacheConfig.Interval,
    24  	})
    25  }
    26  
    27  // NewContext start cache service
    28  func NewContext() error {
    29  	var err error
    30  
    31  	if conn == nil && setting.CacheService.Enabled {
    32  		if conn, err = newCache(setting.CacheService.Cache); err != nil {
    33  			return err
    34  		}
    35  		if err = conn.Ping(); err != nil {
    36  			return err
    37  		}
    38  	}
    39  
    40  	return err
    41  }
    42  
    43  // GetCache returns the currently configured cache
    44  func GetCache() mc.Cache {
    45  	return conn
    46  }
    47  
    48  // GetString returns the key value from cache with callback when no key exists in cache
    49  func GetString(key string, getFunc func() (string, error)) (string, error) {
    50  	if conn == nil || setting.CacheService.TTL == 0 {
    51  		return getFunc()
    52  	}
    53  
    54  	cached := conn.Get(key)
    55  
    56  	if cached == nil {
    57  		value, err := getFunc()
    58  		if err != nil {
    59  			return value, err
    60  		}
    61  		return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
    62  	}
    63  
    64  	if value, ok := cached.(string); ok {
    65  		return value, nil
    66  	}
    67  
    68  	if stringer, ok := cached.(fmt.Stringer); ok {
    69  		return stringer.String(), nil
    70  	}
    71  
    72  	return fmt.Sprintf("%s", cached), nil
    73  }
    74  
    75  // GetInt returns key value from cache with callback when no key exists in cache
    76  func GetInt(key string, getFunc func() (int, error)) (int, error) {
    77  	if conn == nil || setting.CacheService.TTL == 0 {
    78  		return getFunc()
    79  	}
    80  
    81  	cached := conn.Get(key)
    82  
    83  	if cached == nil {
    84  		value, err := getFunc()
    85  		if err != nil {
    86  			return value, err
    87  		}
    88  
    89  		return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
    90  	}
    91  
    92  	switch v := cached.(type) {
    93  	case int:
    94  		return v, nil
    95  	case string:
    96  		value, err := strconv.Atoi(v)
    97  		if err != nil {
    98  			return 0, err
    99  		}
   100  		return value, nil
   101  	default:
   102  		value, err := getFunc()
   103  		if err != nil {
   104  			return value, err
   105  		}
   106  		return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
   107  	}
   108  }
   109  
   110  // GetInt64 returns key value from cache with callback when no key exists in cache
   111  func GetInt64(key string, getFunc func() (int64, error)) (int64, error) {
   112  	if conn == nil || setting.CacheService.TTL == 0 {
   113  		return getFunc()
   114  	}
   115  
   116  	cached := conn.Get(key)
   117  
   118  	if cached == nil {
   119  		value, err := getFunc()
   120  		if err != nil {
   121  			return value, err
   122  		}
   123  
   124  		return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
   125  	}
   126  
   127  	switch v := conn.Get(key).(type) {
   128  	case int64:
   129  		return v, nil
   130  	case string:
   131  		value, err := strconv.ParseInt(v, 10, 64)
   132  		if err != nil {
   133  			return 0, err
   134  		}
   135  		return value, nil
   136  	default:
   137  		value, err := getFunc()
   138  		if err != nil {
   139  			return value, err
   140  		}
   141  
   142  		return value, conn.Put(key, value, setting.CacheService.TTLSeconds())
   143  	}
   144  }
   145  
   146  // Remove key from cache
   147  func Remove(key string) {
   148  	if conn == nil {
   149  		return
   150  	}
   151  	_ = conn.Delete(key)
   152  }