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redis_set_store.go
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/
redis_set_store.go
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// Copyright © 2017 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package storage
import (
"sort"
"strings"
"github.com/TheThingsNetwork/ttn/utils/errors"
"gopkg.in/redis.v5"
)
// RedisSetStore stores sets in Redis
type RedisSetStore struct {
*RedisStore
}
// NewRedisSetStore creates a new RedisSetStore
func NewRedisSetStore(client *redis.Client, prefix string) *RedisSetStore {
if !strings.HasSuffix(prefix, ":") {
prefix += ":"
}
return &RedisSetStore{
RedisStore: NewRedisStore(client, prefix),
}
}
// GetAll returns all results for the given keys, prepending the prefix to the keys if necessary
func (s *RedisSetStore) GetAll(keys []string, options *ListOptions) (map[string][]string, error) {
if len(keys) == 0 {
return map[string][]string{}, nil
}
for i, key := range keys {
if !strings.HasPrefix(key, s.prefix) {
keys[i] = s.prefix + key
}
}
sort.Strings(keys)
selectedKeys := selectKeys(keys, options)
if len(selectedKeys) == 0 {
return map[string][]string{}, nil
}
pipe := s.client.Pipeline()
defer pipe.Close()
// Add all commands to pipeline
cmds := make(map[string]*redis.StringSliceCmd)
for _, key := range selectedKeys {
cmds[key] = pipe.SMembers(key)
}
// Execute pipeline
_, err := pipe.Exec()
if err != nil {
return nil, err
}
// Get all results from pipeline
data := make(map[string][]string)
for key, cmd := range cmds {
res, err := cmd.Result()
if err == nil {
sort.Strings(res)
data[strings.TrimPrefix(key, s.prefix)] = res
}
}
return data, nil
}
// Count the number of items for the given key
func (s *RedisSetStore) Count(key string) (int, error) {
if !strings.HasPrefix(key, s.prefix) {
key = s.prefix + key
}
res, err := s.client.SCard(key).Result()
return int(res), err
}
// List all results matching the selector, prepending the prefix to the selector if necessary
func (s *RedisSetStore) List(selector string, options *ListOptions) (map[string][]string, error) {
allKeys, err := s.Keys(selector)
if err != nil {
return nil, err
}
return s.GetAll(allKeys, options)
}
// Get one result, prepending the prefix to the key if necessary
func (s *RedisSetStore) Get(key string) (res []string, err error) {
if !strings.HasPrefix(key, s.prefix) {
key = s.prefix + key
}
res, err = s.client.SMembers(key).Result()
if err == redis.Nil || len(res) == 0 {
return res, errors.NewErrNotFound(key)
}
sort.Strings(res)
return res, err
}
// Contains returns wheter the set contains a given value, prepending the prefix to the key if necessary
func (s *RedisSetStore) Contains(key string, value string) (res bool, err error) {
if !strings.HasPrefix(key, s.prefix) {
key = s.prefix + key
}
res, err = s.client.SIsMember(key, value).Result()
if err == redis.Nil {
return res, errors.NewErrNotFound(key)
}
return res, err
}
// Add one or more values to the set, prepending the prefix to the key if necessary
func (s *RedisSetStore) Add(key string, values ...string) error {
if !strings.HasPrefix(key, s.prefix) {
key = s.prefix + key
}
valuesI := make([]interface{}, len(values))
for i, v := range values {
valuesI[i] = v
}
return s.client.SAdd(key, valuesI...).Err()
}
// Remove one or more values from the set, prepending the prefix to the key if necessary
func (s *RedisSetStore) Remove(key string, values ...string) error {
if !strings.HasPrefix(key, s.prefix) {
key = s.prefix + key
}
valuesI := make([]interface{}, len(values))
for i, v := range values {
valuesI[i] = v
}
return s.client.SRem(key, valuesI...).Err()
}