Go语言连接Redis之go-redis使用指南
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package utils
import (
"log"
"github.com/astaxie/beego"
"github.com/go-redis/redis"
)
var RedisClient *redis.Client
func init() {
NewClient()
}
func NewClient() *redis.Client {
if RedisClient != nil {
return RedisClient
}
RedisClient = redis.NewClient(&redis.Options{
Addr: beego.AppConfig.String("RedisHost"),
DB: 0, // use default DB
})
_, err := RedisClient.Ping().Result()
if err != nil {
log.Fatalf("redis connection failed: %v", err)
}
return RedisClient
}
redis_api.go
package utils
import (
"encoding/json"
"fmt"
"strings"
"time"
"github.com/ansel1/merry"
"github.com/astaxie/beego/logs"
"github.com/go-redis/redis"
)
func RedisSet(key string, value interface{}, expire int) error {
if expire > 0 {
err := RedisClient.Do("SET", key, value, "PX", expire).Err()
if err != nil {
logs.Error("RedisSet Error! key:", key, "Details:", err.Error())
return err
}
} else {
err := RedisClient.Do("SET", key, value).Err()
if err != nil {
logs.Error("RedisSet Error! key:", key, "Details:", err.Error())
return err
}
}
return nil
}
func RedisKeyExists(key string) (bool, error) {
ok, err := RedisClient.Do("EXISTS", key).Bool()
return ok, err
}
func RedisGet(key string) (string, error) {
value, err := RedisClient.Do("GET", key).String()
if err != nil {
return "", nil
}
return value, nil
}
func RedisGetResult(key string) (interface{}, error) {
v, err := RedisClient.Do("GET", key).Result()
if err == redis.Nil {
return v, nil
}
return v, err
}
func RedisGetInt(key string) (int, error) {
v, err := RedisClient.Do("GET", key).Int()
if err == redis.Nil {
return 0, nil
}
return v, err
}
func RedisGetInt64(key string) (int64, error) {
v, err := RedisClient.Do("GET", key).Int64()
if err == redis.Nil {
return 0, nil
}
return v, err
}
func RedisGetUint64(key string) (uint64, error) {
v, err := RedisClient.Do("GET", key).Uint64()
if err == redis.Nil {
return 0, nil
}
return v, err
}
func RedisGetFloat64(key string) (float64, error) {
v, err := RedisClient.Do("GET", key).Float64()
if err == redis.Nil {
return 0.0, nil
}
return v, err
}
func RedisExpire(key string, expire int) error {
err := RedisClient.Do("EXPIRE", key, expire).Err()
if err != nil {
logs.Error("RedisExpire Error!", key, "Details:", err.Error())
return err
}
return nil
}
func RedisPTTL(key string) (int, error) {
ttl, err := RedisClient.Do("PTTL", key).Int()
if err != nil {
return -1, err
}
return ttl, nil
}
func RedisTTL(key string) (int, error) {
ttl, err := RedisClient.Do("TTL", key).Int()
if err != nil {
return -1, err
}
return ttl, nil
}
func RedisSetJson(key string, value interface{}, expire int) error {
jsonData, _ := json.Marshal(value)
if expire > 0 {
err := RedisClient.Do("SET", key, jsonData, "PX", expire).Err()
if err != nil {
logs.Error("RedisSetJson Error! key:", key, "Details:", err.Error())
return err
}
} else {
err := RedisClient.Do("SET", key, jsonData).Err()
if err != nil {
logs.Error("RedisSetJson Error! key:", key, "Details:", err.Error())
return err
}
}
return nil
}
func RedisGetJson(key string) ([]byte, error) {
value, err := RedisClient.Do("GET", key).String()
if err != nil {
return nil, nil
}
return []byte(value), nil
}
func RedisDel(key string) error {
err := RedisClient.Do("DEL", key).Err()
if err != nil {
logs.Error("RedisDel Error! key:", key, "Details:", err.Error())
}
return err
}
func RedisHGet(key, field string) (string, error) {
value, err := RedisClient.Do("HGET", key, field).String()
if err != nil {
return "", nil
}
return value, nil
}
func RedisHSet(key, field, value string) error {
err := RedisClient.Do("HSET", key, field, value).Err()
if err != nil {
logs.Error("RedisHSet Error!", key, "field:", field, "Details:", err.Error())
}
return err
}
func RedisHDel(key, field string) error {
err := RedisClient.Do("HDEL", key, field).Err()
if err != nil {
logs.Error("RedisHDel Error!", key, "field:", field, "Details:", err.Error())
}
return err
}
func RedisZAdd(key, member, score string) error {
err := RedisClient.Do("ZADD", key, score, member).Err()
if err != nil {
logs.Error("RedisZAdd Error!", key, "member:", member, "score:", score, "Details:", err.Error())
}
return err
}
func RedisZRank(key, member string) (int, error) {
rank, err := RedisClient.Do("ZRANK", key, member).Int()
if err == redis.Nil {
return -1, nil
}
if err != nil {
logs.Error("RedisZRank Error!", key, "member:", member, "Details:", err.Error())
return -1, nil
}
return rank, err
}
func RedisZRange(key string, start, stop int) (values []string, err error) {
values, err = RedisClient.ZRange(key, int64(start), int64(stop)).Result()
if err != nil {
logs.Error("RedisZRange Error!", key, "start:", start, "stop:", stop, "Details:", err.Error())
return
}
return
}
func RedisZRangeWithScores(key string, start, stop int) (values []redis.Z, err error) {
values, err = RedisClient.ZRangeWithScores(key, int64(start), int64(stop)).Result()
if err != nil {
logs.Error("RedisZRange Error!", key, "start:", start, "stop:", stop, "Details:", err.Error())
return
}
return
}
func RedisZRem(key, member string) error {
err := RedisClient.Do("ZREM", key, member).Err()
if err != nil {
logs.Error("RedisZRem Error!", key, "member:", member, "Details:", err.Error())
}
return err
}
func RedisRPUSH(key string, member string) (err error) {
err = RedisClient.Do("RPUSH", key, member).Err()
if err != nil {
logs.Error("RedisRPUSH Error!", key, member, "Details:", err.Error())
return
}
return
}
func RedisBLPOP(timeout time.Duration, keys ...string) (value []string, err error) {
value, err = RedisClient.BLPop(timeout, keys...).Result()
if err == redis.Nil {
err = nil
return
}
if err != nil {
logs.Error("BLPop Error!", keys, timeout, "Details:", err.Error())
return
}
return
}
func RedisLLEN(key string) (value int64, err error) {
value, err = RedisClient.LLen(key).Result()
if err != nil {
logs.Error("RedisLLEN Error!", key, "Details:", err.Error())
return
}
return
}
func RedisLRange(key string, start, stop int) (values []string, err error) {
values, err = RedisClient.LRange(key, int64(start), int64(stop)).Result()
if err != nil {
logs.Error("RedisLRange Error!", key, "start:", start, "stop:", stop, "Details:", err.Error())
return
}
return
}
func RedisKeys(pattern string) (keys []string, err error) {
keys, err = RedisClient.Keys(pattern).Result()
if err != nil {
logs.Error("RedisKeys Error!", pattern, "Details:", err.Error())
return
}
return
}
// RedisListAllValuesWithPrefix will take in a key prefix and return the value of all the keys that contain that prefix
func RedisListAllValuesWithPrefix(prefix string) (map[string]string, error) {
// Grab all the keys with the prefix
keys, err := getKeys(fmt.Sprintf("%s*", prefix))
if err != nil {
return nil, err
}
// We will now iterate through all of the values to
values, err := getKeyAndValuesMap(keys, prefix)
return values, nil
}
// getKeys will take a certain prefix that the keys share and return a list of all the keys
func getKeys(prefix string) ([]string, error) {
var allKeys []string
var cursor uint64
count := int64(10) // count specifies how many keys should be returned in every Scan call
for {
var keys []string
var err error
keys, cursor, err = RedisClient.Scan(cursor, prefix, count).Result()
if err != nil {
return nil, merry.Appendf(err, "error retrieving ‘%s‘ keys", prefix)
}
allKeys = append(allKeys, keys...)
if cursor == 0 {
break
}
}
return allKeys, nil
}
// getKeyAndValuesMap generates a [string]string map structure that will associate an ID with the token value stored in Redis
func getKeyAndValuesMap(keys []string, prefix string) (map[string]string, error) {
values := make(map[string]string)
for _, key := range keys {
value, err := RedisClient.Do("GET", key).String()
if err != nil {
return nil, merry.Appendf(err, "error retrieving value for key %s", key)
}
// Strip off the prefix from the key so that we save the key to the user ID
strippedKey := strings.Split(key, prefix)
values[strippedKey[1]] = value
}
return values, nil
}
func RedisBatchDel(key ...string) error {
err := RedisClient.Del(key...).Err()
if err != nil {
logs.Error("RedisBatchDel Error! key:", key, "Details:", err.Error())
}
return err
}
func RedisMset(pairs ...interface{}) error {
err := RedisClient.MSet(pairs...).Err()
if err != nil {
logs.Error("RedisMset Error! pairs:", pairs, "Details:", err.Error())
}
return err
}
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