forked from kataras/iris
/
service.go
279 lines (240 loc) · 6.56 KB
/
service.go
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package service
import (
"time"
"github.com/garyburd/redigo/redis"
"github.com/kataras/iris/config"
"github.com/kataras/iris/errors"
)
var (
// ErrRedisClosed an error with message 'Redis is already closed'
ErrRedisClosed = errors.New("Redis is already closed")
// ErrKeyNotFound an error with message 'Key $thekey doesn't found'
ErrKeyNotFound = errors.New("Key '%s' doesn't found")
)
// Service the Redis service, contains the config and the redis pool
type Service struct {
// Connected is true when the Service has already connected
Connected bool
// Config the redis config for this redis
Config *config.Redis
pool *redis.Pool
}
// PingPong sends a ping and receives a pong, if no pong received then returns false and filled error
func (r *Service) PingPong() (bool, error) {
c := r.pool.Get()
defer c.Close()
msg, err := c.Do("PING")
if err != nil || msg == nil {
return false, err
}
return (msg == "PONG"), nil
}
// CloseConnection closes the redis connection
func (r *Service) CloseConnection() error {
if r.pool != nil {
return r.pool.Close()
}
return ErrRedisClosed.Return()
}
// Set sets to the redis
// key string, value string, you can use utils.Serialize(&myobject{}) to convert an object to []byte
func (r *Service) Set(key string, value []byte, maxageseconds ...float64) (err error) { // map[interface{}]interface{}) (err error) {
maxage := config.DefaultRedisMaxAgeSeconds //1 year
c := r.pool.Get()
defer c.Close()
if err = c.Err(); err != nil {
return
}
if len(maxageseconds) > 0 {
if max := maxageseconds[0]; max >= 0 {
maxage = max
}
}
_, err = c.Do("SETEX", r.Config.Prefix+key, maxage, value)
return
}
// Get returns value, err by its key
// you can use utils.Deserialize((.Get("yourkey"),&theobject{})
//returns nil and a filled error if something wrong happens
func (r *Service) Get(key string) (interface{}, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
redisVal, err := c.Do("GET", r.Config.Prefix+key)
if err != nil {
return nil, err
}
if redisVal == nil {
return nil, ErrKeyNotFound.Format(key)
}
return redisVal, nil
}
// GetBytes returns value, err by its key
// you can use utils.Deserialize((.GetBytes("yourkey"),&theobject{})
//returns nil and a filled error if something wrong happens
func (r *Service) GetBytes(key string) ([]byte, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
redisVal, err := c.Do("GET", r.Config.Prefix+key)
if err != nil {
return nil, err
}
if redisVal == nil {
return nil, ErrKeyNotFound.Format(key)
}
return redis.Bytes(redisVal, err)
}
// GetString returns value, err by its key
// you can use utils.Deserialize((.GetString("yourkey"),&theobject{})
//returns empty string and a filled error if something wrong happens
func (r *Service) GetString(key string) (string, error) {
redisVal, err := r.Get(key)
if redisVal == nil {
return "", ErrKeyNotFound.Format(key)
}
sVal, err := redis.String(redisVal, err)
if err != nil {
return "", err
}
return sVal, nil
}
// GetInt returns value, err by its key
// you can use utils.Deserialize((.GetInt("yourkey"),&theobject{})
//returns -1 int and a filled error if something wrong happens
func (r *Service) GetInt(key string) (int, error) {
redisVal, err := r.Get(key)
if redisVal == nil {
return -1, ErrKeyNotFound.Format(key)
}
intVal, err := redis.Int(redisVal, err)
if err != nil {
return -1, err
}
return intVal, nil
}
// GetStringMap returns map[string]string, err by its key
//returns nil and a filled error if something wrong happens
func (r *Service) GetStringMap(key string) (map[string]string, error) {
redisVal, err := r.Get(key)
if redisVal == nil {
return nil, ErrKeyNotFound.Format(key)
}
_map, err := redis.StringMap(redisVal, err)
if err != nil {
return nil, err
}
return _map, nil
}
// GetAll returns all keys and their values from a specific key (map[string]string)
// returns a filled error if something bad happened
func (r *Service) GetAll(key string) (map[string]string, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
reply, err := c.Do("HGETALL", r.Config.Prefix+key)
if err != nil {
return nil, err
}
if reply == nil {
return nil, ErrKeyNotFound.Format(key)
}
return redis.StringMap(reply, err)
}
// GetAllKeysByPrefix returns all []string keys by a key prefix from the redis
func (r *Service) GetAllKeysByPrefix(prefix string) ([]string, error) {
c := r.pool.Get()
defer c.Close()
if err := c.Err(); err != nil {
return nil, err
}
reply, err := c.Do("KEYS", r.Config.Prefix+prefix)
if err != nil {
return nil, err
}
if reply == nil {
return nil, ErrKeyNotFound.Format(prefix)
}
return redis.Strings(reply, err)
}
// Delete removes redis entry by specific key
func (r *Service) Delete(key string) error {
c := r.pool.Get()
defer c.Close()
if _, err := c.Do("DEL", r.Config.Prefix+key); err != nil {
return err
}
return nil
}
func dial(network string, addr string, pass string) (redis.Conn, error) {
if network == "" {
network = config.DefaultRedisNetwork
}
if addr == "" {
addr = config.DefaultRedisAddr
}
c, err := redis.Dial(network, addr)
if err != nil {
return nil, err
}
if pass != "" {
if _, err = c.Do("AUTH", pass); err != nil {
c.Close()
return nil, err
}
}
return c, err
}
// Connect connects to the redis, called only once
func (r *Service) Connect() {
c := r.Config
if c.IdleTimeout <= 0 {
c.IdleTimeout = config.DefaultRedisIdleTimeout
}
if c.Network == "" {
c.Network = config.DefaultRedisNetwork
}
if c.Addr == "" {
c.Addr = config.DefaultRedisAddr
}
if c.MaxAgeSeconds <= 0 {
c.MaxAgeSeconds = config.DefaultRedisMaxAgeSeconds
}
pool := &redis.Pool{IdleTimeout: config.DefaultRedisIdleTimeout, MaxIdle: c.MaxIdle, MaxActive: c.MaxActive}
pool.TestOnBorrow = func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
}
if c.Database != "" {
pool.Dial = func() (redis.Conn, error) {
red, err := dial(c.Network, c.Addr, c.Password)
if err != nil {
return nil, err
}
if _, err = red.Do("SELECT", c.Database); err != nil {
red.Close()
return nil, err
}
return red, err
}
} else {
pool.Dial = func() (redis.Conn, error) {
return dial(c.Network, c.Addr, c.Password)
}
}
r.Connected = true
r.pool = pool
}
// New returns a Redis service filled by the passed config
// to connect call the .Connect()
func New(cfg ...config.Redis) *Service {
c := config.DefaultRedis().Merge(cfg)
r := &Service{pool: &redis.Pool{}, Config: &c}
return r
}