/
redis_news_store.go
66 lines (53 loc) · 1.4 KB
/
redis_news_store.go
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package news_manager
import (
"github.com/go-redis/redis"
"github.com/pelletier/go-toml"
om "github.com/pingguodeli573365/delinkcious/pkg/object_model"
)
const redisMaxPageSize = 10
// RedisNewsStore manages a UserEvents data structure
type RedisNewsStore struct {
redis *redis.Client
}
func (m *RedisNewsStore) GetNews(username string, startIndex int) (events []*om.LinkManagerEvent, nextIndex int, err error) {
stop := startIndex + redisMaxPageSize - 1
result, err := m.redis.LRange(username, int64(startIndex), int64(stop)).Result()
if err != nil {
return
}
for _, t := range result {
var event om.LinkManagerEvent
err = toml.Unmarshal([]byte(t), &event)
if err != nil {
return
}
events = append(events, &event)
}
if len(result) == redisMaxPageSize {
nextIndex = stop + 1
} else {
nextIndex = -1
}
return
}
func (m *RedisNewsStore) AddEvent(username string, event *om.LinkManagerEvent) (err error) {
t, err := toml.Marshal(*event)
if err != nil {
return
}
err = m.redis.RPush(username, t).Err()
return
}
func NewRedisNewsStore(address string) (store Store, err error) {
client := redis.NewClient(&redis.Options{
Addr: address,
Password: "", // use empty password for simplicity. should come from a secret in production
DB: 0, // use default DB
})
_, err = client.Ping().Result()
if err != nil {
return
}
store = &RedisNewsStore{redis: client}
return
}