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redis.go
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redis.go
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package redis
import (
"github.com/go-redis/redis"
"istio.io/pkg/log"
"os"
"strconv"
)
var client *redis.Client
func GetUsedUnits(applicationId string) int {
val, err := getRedisClient().HGet(applicationId, "used").Result()
if err == redis.Nil {
return 0
}
units, parseErr := strconv.Atoi(val)
if parseErr != nil {
log.Fatalf(parseErr.Error())
}
return units
}
func GetRemainingUnits(applicationId string) int {
val, err := getRedisClient().HGet(applicationId, "remaining").Result()
if err == redis.Nil {
return 0
}
units, parseErr := strconv.Atoi(val)
if parseErr != nil {
log.Fatalf(parseErr.Error())
}
return units
}
func SetUsedUnits(applicationId string, used int) {
_, err := getRedisClient().HSet(applicationId, "used", used).Result()
if err != nil {
log.Errorf(err.Error())
}
}
func SetRemainingUnits(applicationId string, remaining int) {
_, err := getRedisClient().HSet(applicationId, "remaining", remaining).Result()
if err != nil {
log.Errorf(err.Error())
}
}
func GetUsageInfo() map[string]int {
resultMap := make(map[string]int)
keys, _, err := getRedisClient().Scan(0, "*", 0).Result()
if err != nil {
log.Errorf(err.Error())
}
for _, key := range keys {
val := GetUsedUnits(key)
resultMap[key] = val
}
return resultMap
}
func IncreaseUsedValue(applicationId string) {
val := GetUsedUnits(applicationId)
SetUsedUnits(applicationId, val+1)
}
func DecreaseRemainingValue(applicationId string) {
val := GetRemainingUnits(applicationId)
SetRemainingUnits(applicationId, val-1)
}
func getRedisClient() *redis.Client {
if client != nil {
return client
}
var (
host = getEnv("REDIS_HOST", "localhost")
port = getEnv("REDIS_PORT", "6379")
password = getEnv("REDIS_PASSWORD", "")
)
client = redis.NewClient(&redis.Options{
Addr: host + ":" + port,
Password: password,
DB: 0,
})
_, err := client.Ping().Result()
if err != nil {
log.Fatalf(err.Error())
}
return client
}
func getEnv(key, defaultValue string) string {
value := os.Getenv(key)
if value == "" {
return defaultValue
}
return value
}