graham.systems
Fetch, resize, reformat, and cache Atmosphere avatar images
atp.pics
atproto
1// Package cache provides a lightweight in-process TTL cache for DID → avatar CID mappings.
2package cache
3
4import (
5 "sync"
6 "time"
7)
8
9const ttl = 5 * time.Minute
10
11type entry struct {
12 cid string
13 mimeType string
14 expiry time.Time
15}
16
17// CIDCache caches DID → (avatar CID, mimeType) with a fixed 5-minute TTL.
18type CIDCache struct {
19 m sync.Map
20}
21
22func (c *CIDCache) Get(did string) (cid, mimeType string, ok bool) {
23 v, ok := c.m.Load(did)
24 if !ok {
25 return "", "", false
26 }
27 e := v.(entry)
28 if time.Now().After(e.expiry) {
29 c.m.Delete(did)
30 return "", "", false
31 }
32 return e.cid, e.mimeType, true
33}
34
35func (c *CIDCache) Set(did, cid, mimeType string) {
36 c.m.Store(did, entry{cid: cid, mimeType: mimeType, expiry: time.Now().Add(ttl)})
37}