remove redis_cacher.go
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Nash Tsai
parent
48798e566f
commit
e41af85ab4
273
redis_cacher.go
273
redis_cacher.go
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@ -1,273 +0,0 @@
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package xorm
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"github.com/garyburd/redigo/redis"
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//"github.com/go-xorm/core"
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"hash/crc32"
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"log"
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"reflect"
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// "strconv"
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"time"
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)
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const (
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DEFAULT_EXPIRATION = time.Duration(0)
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FOREVER_EXPIRATION = time.Duration(-1)
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)
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// Wraps the Redis client to meet the Cache interface.
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type RedisCacher struct {
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pool *redis.Pool
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defaultExpiration time.Duration
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}
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// until redigo supports sharding/clustering, only one host will be in hostList
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func NewRedisCacher(host string, password string, defaultExpiration time.Duration) *RedisCacher {
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var pool = &redis.Pool{
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MaxIdle: 5,
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IdleTimeout: 240 * time.Second,
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Dial: func() (redis.Conn, error) {
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// the redis protocol should probably be made sett-able
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c, err := redis.Dial("tcp", host)
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if err != nil {
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return nil, err
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}
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if len(password) > 0 {
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if _, err := c.Do("AUTH", password); err != nil {
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c.Close()
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return nil, err
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}
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} else {
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// check with PING
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if _, err := c.Do("PING"); err != nil {
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c.Close()
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return nil, err
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}
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}
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return c, err
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},
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// custom connection test method
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TestOnBorrow: func(c redis.Conn, t time.Time) error {
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if _, err := c.Do("PING"); err != nil {
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return err
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}
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return nil
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},
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}
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return &RedisCacher{pool, defaultExpiration}
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}
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func exists(conn redis.Conn, key string) bool {
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existed, _ := redis.Bool(conn.Do("EXISTS", key))
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return existed
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}
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func (c *RedisCacher) getBeanKey(tableName string, id string) string {
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return fmt.Sprintf("bean:%s:%s", tableName, id)
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}
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func (c *RedisCacher) getSqlKey(tableName string, sql string) string {
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// hash sql to minimize key length
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crc := crc32.ChecksumIEEE([]byte(sql))
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return fmt.Sprintf("sql:%s:%d", tableName, crc)
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}
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func (c *RedisCacher) Flush() error {
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conn := c.pool.Get()
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defer conn.Close()
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_, err := conn.Do("FLUSHALL")
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return err
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}
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func (c *RedisCacher) getObject(key string) interface{} {
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conn := c.pool.Get()
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defer conn.Close()
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raw, err := conn.Do("GET", key)
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if raw == nil {
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return nil
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}
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item, err := redis.Bytes(raw, err)
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if err != nil {
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log.Fatalf("[xorm/redis_cacher] redis.Bytes failed: %s", err)
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return nil
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}
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value, err := deserialize(item)
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return value
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}
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func (c *RedisCacher) GetIds(tableName, sql string) interface{} {
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log.Printf("[xorm/redis_cacher] GetIds|tableName:%s|sql:%s", tableName, sql)
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return c.getObject(c.getSqlKey(tableName, sql))
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}
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func (c *RedisCacher) GetBean(tableName string, id string) interface{} {
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log.Printf("[xorm/redis_cacher] GetBean|tableName:%s|id:%s", tableName, id)
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return c.getObject(c.getBeanKey(tableName, id))
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}
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func (c *RedisCacher) putObject(key string, value interface{}) {
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c.invoke(c.pool.Get().Do, key, value, c.defaultExpiration)
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}
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func (c *RedisCacher) PutIds(tableName, sql string, ids interface{}) {
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log.Printf("[xorm/redis_cacher] PutIds|tableName:%s|sql:%s|type:%v", tableName, sql, reflect.TypeOf(ids))
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c.putObject(c.getSqlKey(tableName, sql), ids)
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}
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func (c *RedisCacher) PutBean(tableName string, id string, obj interface{}) {
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log.Printf("[xorm/redis_cacher] PutBean|tableName:%s|id:%s|type:%v", tableName, id, reflect.TypeOf(obj))
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c.putObject(c.getBeanKey(tableName, id), obj)
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}
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func (c *RedisCacher) delObject(key string) {
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conn := c.pool.Get()
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defer conn.Close()
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if !exists(conn, key) {
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return // core.ErrCacheMiss
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}
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conn.Do("DEL", key)
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// _, err := conn.Do("DEL", key)
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// return err
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}
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func (c *RedisCacher) DelIds(tableName, sql string) {
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c.delObject(c.getSqlKey(tableName, sql))
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}
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func (c *RedisCacher) DelBean(tableName string, id string) {
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c.delObject(c.getBeanKey(tableName, id))
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}
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func (c *RedisCacher) clearObjects(key string) {
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conn := c.pool.Get()
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defer conn.Close()
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if exists(conn, key) {
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// _, err := conn.Do("DEL", key)
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// return err
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conn.Do("DEL", key)
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} else {
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// return ErrCacheMiss
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}
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}
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func (c *RedisCacher) ClearIds(tableName string) {
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// TODO
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c.clearObjects(c.getSqlKey(tableName, "*"))
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}
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func (c *RedisCacher) ClearBeans(tableName string) {
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c.clearObjects(c.getBeanKey(tableName, "*"))
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}
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func (c *RedisCacher) invoke(f func(string, ...interface{}) (interface{}, error),
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key string, value interface{}, expires time.Duration) error {
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switch expires {
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case DEFAULT_EXPIRATION:
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expires = c.defaultExpiration
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case FOREVER_EXPIRATION:
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expires = time.Duration(0)
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}
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b, err := serialize(value)
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if err != nil {
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return err
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}
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conn := c.pool.Get()
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defer conn.Close()
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if expires > 0 {
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_, err := f("SETEX", key, int32(expires/time.Second), b)
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return err
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} else {
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_, err := f("SET", key, b)
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return err
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}
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}
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func serialize(value interface{}) ([]byte, error) {
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RegisterGobConcreteType(value)
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var b bytes.Buffer
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encoder := gob.NewEncoder(&b)
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if err := interfaceEncode(encoder, value); err != nil {
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log.Fatalf("[xorm/redis_cacher] gob encoding '%s' failed: %s", value, err)
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return nil, err
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}
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return b.Bytes(), nil
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}
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func deserialize(byt []byte) (ptr interface{}, err error) {
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b := bytes.NewBuffer(byt)
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decoder := gob.NewDecoder(b)
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if ptr, err = interfaceDecode(decoder); err != nil {
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log.Fatalf("[xorm/redis_cacher] gob decoding failed: %s", err)
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return
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}
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return
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}
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func RegisterGobConcreteType(value interface{}) {
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t := reflect.TypeOf(value)
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log.Printf("[xorm/redis_cacher] RegisterGobConcreteType:%v", t)
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switch t.Kind() {
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case reflect.Ptr:
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v := reflect.ValueOf(value)
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i := v.Elem().Interface()
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gob.Register(i)
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case reflect.Struct, reflect.Map, reflect.Slice:
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gob.Register(value)
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case reflect.String, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Bool, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
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// do nothing since already registered known type
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default:
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panic(fmt.Errorf("unhandled type: %v", t))
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}
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}
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// interfaceEncode encodes the interface value into the encoder.
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func interfaceEncode(enc *gob.Encoder, p interface{}) error {
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// The encode will fail unless the concrete type has been
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// registered. We registered it in the calling function.
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// Pass pointer to interface so Encode sees (and hence sends) a value of
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// interface type. If we passed p directly it would see the concrete type instead.
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// See the blog post, "The Laws of Reflection" for background.
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log.Printf("[xorm/redis_cacher] interfaceEncode type:%v", reflect.TypeOf(p))
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err := enc.Encode(&p)
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if err != nil {
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log.Fatal("[xorm/redis_cacher] encode:", err)
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}
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return err
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}
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// interfaceDecode decodes the next interface value from the stream and returns it.
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func interfaceDecode(dec *gob.Decoder) (interface{}, error) {
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// The decode will fail unless the concrete type on the wire has been
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// registered. We registered it in the calling function.
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var p interface{}
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err := dec.Decode(&p)
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if err != nil {
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log.Fatal("[xorm/redis_cacher] decode:", err)
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}
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log.Printf("[xorm/redis_cacher] interfaceDecode type:%v", reflect.TypeOf(p))
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if reflect.TypeOf(p).Kind() == reflect.Struct {
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// TODO need to convert p to pointer of struct, however, encountered reflect.ValueOf(p).CanAddr() == false
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}
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return p, err
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}
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