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redis.go
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redis.go
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package astiredis
import (
"bytes"
"encoding/gob"
"time"
"github.com/asticode/go-astilog"
"gopkg.in/redis.v5"
)
// Nil error
var Nil = redis.Nil
// Client represents a client
type Client struct {
client *redis.Client
prefix string
}
// New returns a client based on a configuration
func New(c Configuration) *Client {
return &Client{
client: redis.NewClient(&redis.Options{
Addr: c.Addr,
}),
prefix: c.Prefix,
}
}
// key builds a key with the prefix
func (c *Client) key(k string) string {
if len(c.prefix) == 0 {
return k
}
return c.prefix + "." + k
}
// Del deletes a key
func (c *Client) Del(k string) error {
astilog.Debugf("astiredis: deleting redis key %s", c.key(k))
return c.client.Del(c.key(k)).Err()
}
// Get gets a value
func (c *Client) Get(k string, v interface{}) error {
astilog.Debugf("astiredis: getting redis key %s", c.key(k))
b, err := c.client.Get(c.key(k)).Bytes()
if err != nil {
return err
}
// Decode
return gob.NewDecoder(bytes.NewReader(b)).Decode(v)
}
// Set sets a value
func (c *Client) Set(k string, v interface{}, ttl time.Duration) error {
// Encode
buf := bytes.Buffer{}
err := gob.NewEncoder(&buf).Encode(v)
if err != nil {
return err
}
// Set
astilog.Debugf("astiredis: setting redis key %s", c.key(k))
return c.client.Set(c.key(k), buf.Bytes(), ttl).Err()
}
// SetNX sets a value if it doesn't exist
func (c *Client) SetNX(k string, v interface{}, ttl time.Duration) (bool, error) {
// Encode
buf := bytes.Buffer{}
err := gob.NewEncoder(&buf).Encode(v)
if err != nil {
return false, err
}
// Set
astilog.Debugf("astiredis: setting redis key %s if not exists", c.key(k))
return c.client.SetNX(c.key(k), buf.Bytes(), ttl).Result()
}