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store.go
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store.go
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package main
import (
"encoding/json"
"log"
"gopkg.in/redis.v3"
)
const (
redisRedirectsKey = "shortlink_redirects"
)
type store struct {
db *redis.Client
}
func (s *store) Redirects() (redirects []*redirect) {
results, err := s.db.HGetAllMap(redisRedirectsKey).Result()
if err != nil {
log.Printf("store.Redirects(): %v", err)
}
for _, jsonString := range results {
redirect := new(redirect)
json.Unmarshal([]byte(jsonString), redirect)
redirects = append(redirects, redirect)
}
return
}
func (s *store) Add(redirect *redirect) error {
jsonBytes, err := json.Marshal(redirect)
if err != nil {
panic(err)
}
s.db.HSet(redisRedirectsKey, redirect.From, string(jsonBytes)).Result()
return nil
}
func (s *store) Get(from string) (r *redirect, ok bool) {
jsonString, err := s.db.HGet(redisRedirectsKey, from).Result()
if err != nil {
log.Printf("store.Get(%q): %v", from, err)
return nil, false
}
r = new(redirect)
if err := json.Unmarshal([]byte(jsonString), r); err != nil {
log.Printf("store.Get(%q): %v", from, err)
return nil, false
}
return r, true
}
func (s *store) Delete(from string) {
cnt, err := s.db.HDel(redisRedirectsKey, from).Result()
if err != nil {
log.Printf("store.Delete(%q): %v", from, err)
}
if cnt != 1 {
log.Printf("store.Delete(%q): not found", from)
}
}
func (s *store) DeleteAll() {
s.db.Del(redisRedirectsKey)
}
func (s *store) Close() error {
return s.db.Close()
}
/// NewStore creates a new redirect store.
func NewStore() (s *store) {
s = &store{
db: redis.NewClient(&redis.Options{Addr: "redis:6379"}),
}
return
}