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Apache License
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# cache [![Build Status](https://travis-ci.org/go-macaron/cache.svg?branch=master)](https://travis-ci.org/go-macaron/cache) [![](http://gocover.io/_badge/github.com/go-macaron/cache)](http://gocover.io/github.com/go-macaron/cache)
Middleware cache provides cache management for [Macaron](https://github.com/go-macaron/macaron). It can use many cache adapters, including memory, file, Redis, Memcache, PostgreSQL, MySQL, Ledis and Nodb.
### Installation
go get github.com/go-macaron/cache
## Getting Help
- [API Reference](https://gowalker.org/github.com/go-macaron/cache)
- [Documentation](http://go-macaron.com/docs/middlewares/cache)
## Credits
This package is a modified version of [beego/cache](https://github.com/astaxie/beego/tree/master/cache).
## License
This project is under the Apache License, Version 2.0. See the [LICENSE](LICENSE) file for the full license text.

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// Package cache is a middleware that provides the cache management of Macaron.
package cache
import (
"fmt"
"gopkg.in/macaron.v1"
)
const _VERSION = "0.3.0"
func Version() string {
return _VERSION
}
// Cache is the interface that operates the cache data.
type Cache interface {
// Put puts value into cache with key and expire time.
Put(key string, val interface{}, timeout int64) error
// Get gets cached value by given key.
Get(key string) interface{}
// Delete deletes cached value by given key.
Delete(key string) error
// Incr increases cached int-type value by given key as a counter.
Incr(key string) error
// Decr decreases cached int-type value by given key as a counter.
Decr(key string) error
// IsExist returns true if cached value exists.
IsExist(key string) bool
// Flush deletes all cached data.
Flush() error
// StartAndGC starts GC routine based on config string settings.
StartAndGC(opt Options) error
}
// Options represents a struct for specifying configuration options for the cache middleware.
type Options struct {
// Name of adapter. Default is "memory".
Adapter string
// Adapter configuration, it's corresponding to adapter.
AdapterConfig string
// GC interval time in seconds. Default is 60.
Interval int
// Occupy entire database. Default is false.
OccupyMode bool
// Configuration section name. Default is "cache".
Section string
}
func prepareOptions(options []Options) Options {
var opt Options
if len(options) > 0 {
opt = options[0]
}
if len(opt.Section) == 0 {
opt.Section = "cache"
}
sec := macaron.Config().Section(opt.Section)
if len(opt.Adapter) == 0 {
opt.Adapter = sec.Key("ADAPTER").MustString("memory")
}
if opt.Interval == 0 {
opt.Interval = sec.Key("INTERVAL").MustInt(60)
}
if len(opt.AdapterConfig) == 0 {
opt.AdapterConfig = sec.Key("ADAPTER_CONFIG").MustString("data/caches")
}
return opt
}
// NewCacher creates and returns a new cacher by given adapter name and configuration.
// It panics when given adapter isn't registered and starts GC automatically.
func NewCacher(name string, opt Options) (Cache, error) {
adapter, ok := adapters[name]
if !ok {
return nil, fmt.Errorf("cache: unknown adapter '%s'(forgot to import?)", name)
}
return adapter, adapter.StartAndGC(opt)
}
// Cacher is a middleware that maps a cache.Cache service into the Macaron handler chain.
// An single variadic cache.Options struct can be optionally provided to configure.
func Cacher(options ...Options) macaron.Handler {
opt := prepareOptions(options)
cache, err := NewCacher(opt.Adapter, opt)
if err != nil {
panic(err)
}
return func(ctx *macaron.Context) {
ctx.Map(cache)
}
}
var adapters = make(map[string]Cache)
// Register registers a adapter.
func Register(name string, adapter Cache) {
if adapter == nil {
panic("cache: cannot register adapter with nil value")
}
if _, dup := adapters[name]; dup {
panic(fmt.Errorf("cache: cannot register adapter '%s' twice", name))
}
adapters[name] = adapter
}

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package cache
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"sync"
"time"
"github.com/Unknwon/com"
"gopkg.in/macaron.v1"
)
// Item represents a cache item.
type Item struct {
Val interface{}
Created int64
Expire int64
}
func (item *Item) hasExpired() bool {
return item.Expire > 0 &&
(time.Now().Unix()-item.Created) >= item.Expire
}
// FileCacher represents a file cache adapter implementation.
type FileCacher struct {
lock sync.Mutex
rootPath string
interval int // GC interval.
}
// NewFileCacher creates and returns a new file cacher.
func NewFileCacher() *FileCacher {
return &FileCacher{}
}
func (c *FileCacher) filepath(key string) string {
m := md5.Sum([]byte(key))
hash := hex.EncodeToString(m[:])
return filepath.Join(c.rootPath, string(hash[0]), string(hash[1]), hash)
}
// Put puts value into cache with key and expire time.
// If expired is 0, it will be deleted by next GC operation.
func (c *FileCacher) Put(key string, val interface{}, expire int64) error {
filename := c.filepath(key)
item := &Item{val, time.Now().Unix(), expire}
data, err := EncodeGob(item)
if err != nil {
return err
}
os.MkdirAll(filepath.Dir(filename), os.ModePerm)
return ioutil.WriteFile(filename, data, os.ModePerm)
}
func (c *FileCacher) read(key string) (*Item, error) {
filename := c.filepath(key)
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
item := new(Item)
return item, DecodeGob(data, item)
}
// Get gets cached value by given key.
func (c *FileCacher) Get(key string) interface{} {
item, err := c.read(key)
if err != nil {
return nil
}
if item.hasExpired() {
os.Remove(c.filepath(key))
return nil
}
return item.Val
}
// Delete deletes cached value by given key.
func (c *FileCacher) Delete(key string) error {
return os.Remove(c.filepath(key))
}
// Incr increases cached int-type value by given key as a counter.
func (c *FileCacher) Incr(key string) error {
item, err := c.read(key)
if err != nil {
return err
}
item.Val, err = Incr(item.Val)
if err != nil {
return err
}
return c.Put(key, item.Val, item.Expire)
}
// Decrease cached int value.
func (c *FileCacher) Decr(key string) error {
item, err := c.read(key)
if err != nil {
return err
}
item.Val, err = Decr(item.Val)
if err != nil {
return err
}
return c.Put(key, item.Val, item.Expire)
}
// IsExist returns true if cached value exists.
func (c *FileCacher) IsExist(key string) bool {
return com.IsExist(c.filepath(key))
}
// Flush deletes all cached data.
func (c *FileCacher) Flush() error {
return os.RemoveAll(c.rootPath)
}
func (c *FileCacher) startGC() {
c.lock.Lock()
defer c.lock.Unlock()
if c.interval < 1 {
return
}
if err := filepath.Walk(c.rootPath, func(path string, fi os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("Walk: %v", err)
}
if fi.IsDir() {
return nil
}
data, err := ioutil.ReadFile(path)
if err != nil && !os.IsNotExist(err) {
fmt.Errorf("ReadFile: %v", err)
}
item := new(Item)
if err = DecodeGob(data, item); err != nil {
return err
}
if item.hasExpired() {
if err = os.Remove(path); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("Remove: %v", err)
}
}
return nil
}); err != nil {
log.Printf("error garbage collecting cache files: %v", err)
}
time.AfterFunc(time.Duration(c.interval)*time.Second, func() { c.startGC() })
}
// StartAndGC starts GC routine based on config string settings.
func (c *FileCacher) StartAndGC(opt Options) error {
c.lock.Lock()
c.rootPath = opt.AdapterConfig
c.interval = opt.Interval
if !filepath.IsAbs(c.rootPath) {
c.rootPath = filepath.Join(macaron.Root, c.rootPath)
}
c.lock.Unlock()
if err := os.MkdirAll(c.rootPath, os.ModePerm); err != nil {
return err
}
go c.startGC()
return nil
}
func init() {
Register("file", NewFileCacher())
}

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package cache
import (
"strings"
"github.com/Unknwon/com"
"github.com/bradfitz/gomemcache/memcache"
"github.com/go-macaron/cache"
)
// MemcacheCacher represents a memcache cache adapter implementation.
type MemcacheCacher struct {
c *memcache.Client
}
func NewItem(key string, data []byte, expire int32) *memcache.Item {
return &memcache.Item{
Key: key,
Value: data,
Expiration: expire,
}
}
// Put puts value into cache with key and expire time.
// If expired is 0, it lives forever.
func (c *MemcacheCacher) Put(key string, val interface{}, expire int64) error {
return c.c.Set(NewItem(key, []byte(com.ToStr(val)), int32(expire)))
}
// Get gets cached value by given key.
func (c *MemcacheCacher) Get(key string) interface{} {
item, err := c.c.Get(key)
if err != nil {
return nil
}
return string(item.Value)
}
// Delete deletes cached value by given key.
func (c *MemcacheCacher) Delete(key string) error {
return c.c.Delete(key)
}
// Incr increases cached int-type value by given key as a counter.
func (c *MemcacheCacher) Incr(key string) error {
_, err := c.c.Increment(key, 1)
return err
}
// Decr decreases cached int-type value by given key as a counter.
func (c *MemcacheCacher) Decr(key string) error {
_, err := c.c.Decrement(key, 1)
return err
}
// IsExist returns true if cached value exists.
func (c *MemcacheCacher) IsExist(key string) bool {
_, err := c.c.Get(key)
return err == nil
}
// Flush deletes all cached data.
func (c *MemcacheCacher) Flush() error {
return c.c.FlushAll()
}
// StartAndGC starts GC routine based on config string settings.
// AdapterConfig: 127.0.0.1:9090;127.0.0.1:9091
func (c *MemcacheCacher) StartAndGC(opt cache.Options) error {
c.c = memcache.New(strings.Split(opt.AdapterConfig, ";")...)
return nil
}
func init() {
cache.Register("memcache", &MemcacheCacher{})
}

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package cache
import (
"errors"
"sync"
"time"
)
// MemoryItem represents a memory cache item.
type MemoryItem struct {
val interface{}
created int64
expire int64
}
func (item *MemoryItem) hasExpired() bool {
return item.expire > 0 &&
(time.Now().Unix()-item.created) >= item.expire
}
// MemoryCacher represents a memory cache adapter implementation.
type MemoryCacher struct {
lock sync.RWMutex
items map[string]*MemoryItem
interval int // GC interval.
}
// NewMemoryCacher creates and returns a new memory cacher.
func NewMemoryCacher() *MemoryCacher {
return &MemoryCacher{items: make(map[string]*MemoryItem)}
}
// Put puts value into cache with key and expire time.
// If expired is 0, it will be deleted by next GC operation.
func (c *MemoryCacher) Put(key string, val interface{}, expire int64) error {
c.lock.Lock()
defer c.lock.Unlock()
c.items[key] = &MemoryItem{
val: val,
created: time.Now().Unix(),
expire: expire,
}
return nil
}
// Get gets cached value by given key.
func (c *MemoryCacher) Get(key string) interface{} {
c.lock.RLock()
defer c.lock.RUnlock()
item, ok := c.items[key]
if !ok {
return nil
}
if item.hasExpired() {
go c.Delete(key)
return nil
}
return item.val
}
// Delete deletes cached value by given key.
func (c *MemoryCacher) Delete(key string) error {
c.lock.Lock()
defer c.lock.Unlock()
delete(c.items, key)
return nil
}
// Incr increases cached int-type value by given key as a counter.
func (c *MemoryCacher) Incr(key string) (err error) {
c.lock.RLock()
defer c.lock.RUnlock()
item, ok := c.items[key]
if !ok {
return errors.New("key not exist")
}
item.val, err = Incr(item.val)
return err
}
// Decr decreases cached int-type value by given key as a counter.
func (c *MemoryCacher) Decr(key string) (err error) {
c.lock.RLock()
defer c.lock.RUnlock()
item, ok := c.items[key]
if !ok {
return errors.New("key not exist")
}
item.val, err = Decr(item.val)
return err
}
// IsExist returns true if cached value exists.
func (c *MemoryCacher) IsExist(key string) bool {
c.lock.RLock()
defer c.lock.RUnlock()
_, ok := c.items[key]
return ok
}
// Flush deletes all cached data.
func (c *MemoryCacher) Flush() error {
c.lock.Lock()
defer c.lock.Unlock()
c.items = make(map[string]*MemoryItem)
return nil
}
func (c *MemoryCacher) checkRawExpiration(key string) {
item, ok := c.items[key]
if !ok {
return
}
if item.hasExpired() {
delete(c.items, key)
}
}
func (c *MemoryCacher) checkExpiration(key string) {
c.lock.Lock()
defer c.lock.Unlock()
c.checkRawExpiration(key)
}
func (c *MemoryCacher) startGC() {
c.lock.Lock()
defer c.lock.Unlock()
if c.interval < 1 {
return
}
if c.items != nil {
for key, _ := range c.items {
c.checkRawExpiration(key)
}
}
time.AfterFunc(time.Duration(c.interval)*time.Second, func() { c.startGC() })
}
// StartAndGC starts GC routine based on config string settings.
func (c *MemoryCacher) StartAndGC(opt Options) error {
c.lock.Lock()
c.interval = opt.Interval
c.lock.Unlock()
go c.startGC()
return nil
}
func init() {
Register("memory", NewMemoryCacher())
}

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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package cache
import (
"fmt"
"strings"
"time"
"github.com/Unknwon/com"
"gopkg.in/ini.v1"
"gopkg.in/redis.v2"
"github.com/go-macaron/cache"
)
// RedisCacher represents a redis cache adapter implementation.
type RedisCacher struct {
c *redis.Client
prefix string
hsetName string
occupyMode bool
}
// Put puts value into cache with key and expire time.
// If expired is 0, it lives forever.
func (c *RedisCacher) Put(key string, val interface{}, expire int64) error {
key = c.prefix + key
if expire == 0 {
if err := c.c.Set(key, com.ToStr(val)).Err(); err != nil {
return err
}
} else {
dur, err := time.ParseDuration(com.ToStr(expire) + "s")
if err != nil {
return err
}
if err = c.c.SetEx(key, dur, com.ToStr(val)).Err(); err != nil {
return err
}
}
if c.occupyMode {
return nil
}
return c.c.HSet(c.hsetName, key, "0").Err()
}
// Get gets cached value by given key.
func (c *RedisCacher) Get(key string) interface{} {
val, err := c.c.Get(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(key).Err(); err != nil {
return err
}
if c.occupyMode {
return nil
}
return c.c.HDel(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(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(c.prefix + key).Err()
}
// IsExist returns true if cached value exists.
func (c *RedisCacher) IsExist(key string) bool {
if c.c.Exists(c.prefix + key).Val() {
return true
}
if !c.occupyMode {
c.c.HDel(c.hsetName, c.prefix+key)
}
return false
}
// Flush deletes all cached data.
func (c *RedisCacher) Flush() error {
if c.occupyMode {
return c.c.FlushDb().Err()
}
keys, err := c.c.HKeys(c.hsetName).Result()
if err != nil {
return err
}
if err = c.c.Del(keys...).Err(); err != nil {
return err
}
return c.c.Del(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
cfg, err := ini.Load([]byte(strings.Replace(opts.AdapterConfig, ",", "\n", -1)))
if err != nil {
return err
}
opt := &redis.Options{
Network: "tcp",
}
for k, v := range cfg.Section("").KeysHash() {
switch k {
case "network":
opt.Network = v
case "addr":
opt.Addr = v
case "password":
opt.Password = v
case "db":
opt.DB = com.StrTo(v).MustInt64()
case "pool_size":
opt.PoolSize = com.StrTo(v).MustInt()
case "idle_timeout":
opt.IdleTimeout, err = time.ParseDuration(v + "s")
if err != nil {
return fmt.Errorf("error parsing idle timeout: %v", err)
}
case "hset_name":
c.hsetName = v
case "prefix":
c.prefix = v
default:
return fmt.Errorf("session/redis: unsupported option '%s'", k)
}
}
c.c = redis.NewClient(opt)
if err = c.c.Ping().Err(); err != nil {
return err
}
return nil
}
func init() {
cache.Register("redis", &RedisCacher{})
}

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// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package cache
import (
"bytes"
"encoding/gob"
"errors"
)
func EncodeGob(item *Item) ([]byte, error) {
buf := bytes.NewBuffer(nil)
err := gob.NewEncoder(buf).Encode(item)
return buf.Bytes(), err
}
func DecodeGob(data []byte, out *Item) error {
buf := bytes.NewBuffer(data)
return gob.NewDecoder(buf).Decode(&out)
}
func Incr(val interface{}) (interface{}, error) {
switch val.(type) {
case int:
val = val.(int) + 1
case int32:
val = val.(int32) + 1
case int64:
val = val.(int64) + 1
case uint:
val = val.(uint) + 1
case uint32:
val = val.(uint32) + 1
case uint64:
val = val.(uint64) + 1
default:
return val, errors.New("item value is not int-type")
}
return val, nil
}
func Decr(val interface{}) (interface{}, error) {
switch val.(type) {
case int:
val = val.(int) - 1
case int32:
val = val.(int32) - 1
case int64:
val = val.(int64) - 1
case uint:
if val.(uint) > 0 {
val = val.(uint) - 1
} else {
return val, errors.New("item value is less than 0")
}
case uint32:
if val.(uint32) > 0 {
val = val.(uint32) - 1
} else {
return val, errors.New("item value is less than 0")
}
case uint64:
if val.(uint64) > 0 {
val = val.(uint64) - 1
} else {
return val, errors.New("item value is less than 0")
}
default:
return val, errors.New("item value is not int-type")
}
return val, nil
}