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package cache
import (
"sync"
"github.com/ReneKroon/ttlcache"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
// AccountCache is a wrapper around ttlcache.Cache to provide URL and URI lookups for gtsmodel.Account
type AccountCache struct {
cache *ttlcache.Cache // map of IDs -> cached accounts
urls map[string]string // map of account URLs -> IDs
uris map[string]string // map of account URIs -> IDs
mutex sync.Mutex
}
// NewAccountCache returns a new instantiated AccountCache object
func NewAccountCache() *AccountCache {
c := AccountCache{
cache: ttlcache.NewCache(),
urls: make(map[string]string, 100),
uris: make(map[string]string, 100),
mutex: sync.Mutex{},
}
// Set callback to purge lookup maps on expiration
c.cache.SetExpirationCallback(func(key string, value interface{}) {
account, ok := value.(*gtsmodel.Account)
if !ok {
logrus.Panicf("AccountCache could not assert entry with key %s to *gtsmodel.Account", key)
}
c.mutex.Lock()
delete(c.urls, account.URL)
delete(c.uris, account.URI)
c.mutex.Unlock()
})
return &c
}
// GetByID attempts to fetch a account from the cache by its ID, you will receive a copy for thread-safety
func (c *AccountCache) GetByID(id string) (*gtsmodel.Account, bool) {
c.mutex.Lock()
account, ok := c.getByID(id)
c.mutex.Unlock()
return account, ok
}
// GetByURL attempts to fetch a account from the cache by its URL, you will receive a copy for thread-safety
func (c *AccountCache) GetByURL(url string) (*gtsmodel.Account, bool) {
// Perform safe ID lookup
c.mutex.Lock()
id, ok := c.urls[url]
// Not found, unlock early
if !ok {
c.mutex.Unlock()
return nil, false
}
// Attempt account lookup
account, ok := c.getByID(id)
c.mutex.Unlock()
return account, ok
}
// GetByURI attempts to fetch a account from the cache by its URI, you will receive a copy for thread-safety
func (c *AccountCache) GetByURI(uri string) (*gtsmodel.Account, bool) {
// Perform safe ID lookup
c.mutex.Lock()
id, ok := c.uris[uri]
// Not found, unlock early
if !ok {
c.mutex.Unlock()
return nil, false
}
// Attempt account lookup
account, ok := c.getByID(id)
c.mutex.Unlock()
return account, ok
}
// getByID performs an unsafe (no mutex locks) lookup of account by ID, returning a copy of account in cache
func (c *AccountCache) getByID(id string) (*gtsmodel.Account, bool) {
v, ok := c.cache.Get(id)
if !ok {
return nil, false
}
return copyAccount(v.(*gtsmodel.Account)), true
}
// Put places a account in the cache, ensuring that the object place is a copy for thread-safety
func (c *AccountCache) Put(account *gtsmodel.Account) {
if account == nil || account.ID == "" {
panic("invalid account")
}
c.mutex.Lock()
c.cache.Set(account.ID, copyAccount(account))
if account.URL != "" {
c.urls[account.URL] = account.ID
}
if account.URI != "" {
c.uris[account.URI] = account.ID
}
c.mutex.Unlock()
}
// copyAccount performs a surface-level copy of account, only keeping attached IDs intact, not the objects.
// due to all the data being copied being 99% primitive types or strings (which are immutable and passed by ptr)
// this should be a relatively cheap process
func copyAccount(account *gtsmodel.Account) *gtsmodel.Account {
return >smodel.Account{
ID: account.ID,
Username: account.Username,
Domain: account.Domain,
AvatarMediaAttachmentID: account.AvatarMediaAttachmentID,
AvatarMediaAttachment: nil,
AvatarRemoteURL: account.AvatarRemoteURL,
HeaderMediaAttachmentID: account.HeaderMediaAttachmentID,
HeaderMediaAttachment: nil,
HeaderRemoteURL: account.HeaderRemoteURL,
DisplayName: account.DisplayName,
Fields: account.Fields,
Note: account.Note,
Memorial: account.Memorial,
MovedToAccountID: account.MovedToAccountID,
CreatedAt: account.CreatedAt,
UpdatedAt: account.UpdatedAt,
Bot: account.Bot,
Reason: account.Reason,
Locked: account.Locked,
Discoverable: account.Discoverable,
Privacy: account.Privacy,
Sensitive: account.Sensitive,
Language: account.Language,
URI: account.URI,
URL: account.URL,
LastWebfingeredAt: account.LastWebfingeredAt,
InboxURI: account.InboxURI,
OutboxURI: account.OutboxURI,
FollowingURI: account.FollowingURI,
FollowersURI: account.FollowersURI,
FeaturedCollectionURI: account.FeaturedCollectionURI,
ActorType: account.ActorType,
AlsoKnownAs: account.AlsoKnownAs,
PrivateKey: account.PrivateKey,
PublicKey: account.PublicKey,
PublicKeyURI: account.PublicKeyURI,
SensitizedAt: account.SensitizedAt,
SilencedAt: account.SilencedAt,
SuspendedAt: account.SuspendedAt,
HideCollections: account.HideCollections,
SuspensionOrigin: account.SuspensionOrigin,
}
}
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