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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package cache | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/kelindar/binary" | ||
| "github.com/mitchellh/hashstructure/v2" | ||
| "gorm.io/gorm" | ||
| ) | ||
|
|
||
| type Cache struct { | ||
| ID uint `gorm:"primaryKey" json:"id"` | ||
| ExpiresAt time.Time `json:"expires_at"` | ||
| HashKey string `json:"hash_key"` | ||
| Value []byte `gorm:"type:BLOB" json:"item"` | ||
| } | ||
|
|
||
| func DeleteExpired(db *gorm.DB) error { | ||
| err := db.Exec("DELETE FROM caches WHERE expires_at < ?", time.Now()).Error | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func Lookup[I any, K any](db *gorm.DB, key K, fallback func() I) I { | ||
| var item I | ||
| var cache Cache | ||
|
|
||
| hash, err := hashstructure.Hash(key, hashstructure.FormatV2, nil) | ||
| hashKey := fmt.Sprintf("%d", hash) | ||
| if err == nil { | ||
| err := db.Where("hash_key = ?", hashKey).First(&cache).Error | ||
| if err == nil { | ||
| if time.Now().Before(cache.ExpiresAt) { | ||
| err := binary.Unmarshal(cache.Value, &item) | ||
| if err == nil { | ||
| return item | ||
| } | ||
| } else { | ||
| DeleteExpired(db) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| item = fallback() | ||
| bytes, err := binary.Marshal(item) | ||
| if err == nil { | ||
| cache = Cache{ | ||
| ExpiresAt: time.Now().Add(24 * time.Hour), | ||
| HashKey: hashKey, | ||
| Value: bytes, | ||
| } | ||
| db.Save(&cache) | ||
| } | ||
| return item | ||
| } |
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