/
redis.go
134 lines (121 loc) · 2.88 KB
/
redis.go
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package server
import (
"context"
"log"
"os"
"time"
"github.com/gomodule/redigo/redis"
"github.com/keys-pub/keys-ext/ws/api"
)
// NewRedisPool from env.
func NewRedisPool() *redis.Pool {
redisAddr := os.Getenv("REDIS_ADDR")
redisPassword := os.Getenv("REDIS_PASSWORD")
return &redis.Pool{
Dial: func() (redis.Conn, error) {
conn, err := redis.Dial("tcp", redisAddr)
if redisPassword == "" {
return conn, err
}
if err != nil {
return nil, err
}
if _, err := conn.Do("AUTH", redisPassword); err != nil {
_ = conn.Close()
return nil, err
}
return conn, nil
},
// TODO: Tune other settings, like IdleTimeout, MaxActive, MaxIdle, TestOnBorrow.
}
}
// Redis ...
type Redis struct {
redisPool *redis.Pool
hub *Hub
secretKey *[32]byte
}
// NewRedis ...
func NewRedis(hub *Hub, secretKey *[32]byte) *Redis {
redisPool := NewRedisPool()
return &Redis{
redisPool: redisPool,
hub: hub,
secretKey: secretKey,
}
}
// Subscribe ...
func (r *Redis) Subscribe() error {
redisConn := r.redisPool.Get()
defer redisConn.Close()
log.Printf("subscribe\n")
psc := redis.PubSubConn{Conn: redisConn}
if err := psc.Subscribe(api.EventPubSub); err != nil {
return err
}
for {
switch v := psc.Receive().(type) {
case redis.Message:
log.Printf("channel %s (%d)\n", v.Channel, len(v.Data))
var event api.Event
if err := api.Decrypt(v.Data, &event, r.secretKey); err != nil {
log.Printf("error decrypting event: %v\n", err)
}
r.hub.broadcast <- &event
case redis.Subscription:
log.Printf("subscription %s: %s %d\n", v.Channel, v.Kind, v.Count)
case error:
return v
}
}
}
// Get value.
func (r *Redis) Get(ctx context.Context, k string) (string, error) {
redisConn := r.redisPool.Get()
defer redisConn.Close()
s, err := redis.String(redisConn.Do("GET", k))
if err == redis.ErrNil {
return "", nil
} else if err != nil {
return "", err
}
return s, nil
}
// Expire value.
func (r *Redis) Expire(ctx context.Context, k string, dt time.Duration) error {
redisConn := r.redisPool.Get()
defer redisConn.Close()
seconds := int64(dt / time.Second)
if _, err := redisConn.Do("EXPIRE", k, seconds); err != nil {
return err
}
return nil
}
// Increment value.
func (r *Redis) Increment(ctx context.Context, k string) (int64, error) {
redisConn := r.redisPool.Get()
defer redisConn.Close()
n, err := redis.Int64(redisConn.Do("INCR", k))
if err != nil {
return 0, err
}
return n, nil
}
// Set value.
func (r *Redis) Set(ctx context.Context, k string, v string) error {
redisConn := r.redisPool.Get()
defer redisConn.Close()
if _, err := redisConn.Do("SET", k, v); err != nil {
return err
}
return nil
}
// Delete value.
func (r *Redis) Delete(ctx context.Context, k string) error {
redisConn := r.redisPool.Get()
defer redisConn.Close()
if _, err := redisConn.Do("DEL", k); err != nil {
return err
}
return nil
}