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db.go
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db.go
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package beepboop
import (
"encoding/json"
"fmt"
"time"
"github.com/go-redis/redis/v7"
)
// DB ...
type DB struct {
client *redis.Client
CacheDuration time.Duration
SessionDuration time.Duration
}
type dbContextKeyType struct{}
var dbContextKey = &dbContextKeyType{}
// NewDB returns a new DB
func NewDB(redisUrl string) (*DB, error) {
opt, err := redis.ParseURL(redisUrl)
if err != nil {
return nil, err
}
client := redis.NewClient(opt)
if err := client.Ping().Err(); err != nil {
client.Close()
return nil, err
}
return &DB{
client: client,
CacheDuration: time.Hour,
SessionDuration: time.Hour * 24 * 7,
}, nil
}
// CacheValue caches a value
func (db *DB) CacheValue(key string, value interface{}, rewriteExisting bool) error {
data, err := json.Marshal(value)
if err != nil {
return err
}
if rewriteExisting {
return db.client.Set("beepboop-cache:"+key, data, db.CacheDuration).Err()
}
return db.client.SetNX("beepboop-cache:"+key, data, db.CacheDuration).Err()
}
// UncacheValue removes a cached value
func (db *DB) UncacheValue(key string) error {
return db.client.Del("beepboop-cache:" + key).Err()
}
// GetCachedValue tries to unmarshal a cached value
func (db *DB) GetCachedValue(key string, value interface{}) error {
data, err := db.client.Get("beepboop-cache:" + key).Result()
if err != nil {
return err
}
return json.Unmarshal([]byte(data), value)
}
// IsWithinRateLimit returns whether a request is withing rate limit per minute
func (db *DB) IsWithinRateLimit(reqType, ip string, rate int) (bool, error) {
key := fmt.Sprintf("beepboop-rate:%s:%s", reqType, ip)
pipe := db.client.TxPipeline()
incr := pipe.Incr(key)
pipe.Expire(key, time.Minute)
_, err := pipe.Exec()
if err != nil {
return false, err
}
return int(incr.Val()) <= rate, nil
}
func (db *DB) addSessionAccess(sessionID, ip string, access AccessMap) error {
key := fmt.Sprintf("beepboop-session:%s:%s", sessionID, ip)
data, _ := db.client.Get(key).Result()
var sessAccess AccessMap
if len(data) > 0 {
err := json.Unmarshal([]byte(data), &sessAccess)
if err != nil {
return err
}
sessAccess.Merge(access)
} else {
sessAccess = access
}
newData, err := json.Marshal(sessAccess)
if err != nil {
return err
}
return db.client.Set(key, string(newData), db.SessionDuration).Err()
}
func (db *DB) revokeSessionAccess(sessionID, ip string, revoke AccessRevokeMap) error {
key := fmt.Sprintf("beepboop-session:%s:%s", sessionID, ip)
data, err := db.client.Get(key).Result()
if err != nil {
return err
}
sessAccess := make(AccessMap)
err = json.Unmarshal([]byte(data), &sessAccess)
if err != nil {
return err
}
sessAccess.Revoke(revoke, false)
newData, err := json.Marshal(sessAccess)
if err != nil {
return err
}
return db.client.Set(key, string(newData), db.SessionDuration).Err()
}
func (db *DB) getAccessMap(sessionID, ip string) (AccessMap, error) {
key := fmt.Sprintf("beepboop-session:%s:%s", sessionID, ip)
data, err := db.client.Get(key).Result()
if err != nil {
return nil, err
}
var access AccessMap
err = json.Unmarshal([]byte(data), &access)
if err != nil {
return nil, err
}
return access, nil
}