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package fetchers
import (
"context"
"encoding/json"
"fmt"
"llostre/backend/notes"
"sort"
"time"
"github.com/redis/go-redis/v9"
)
type Cache struct {
client *redis.Client
ctx context.Context
expiryTime time.Duration
}
func NewCache(addr, password string, expiryMinutes int) (*Cache, error) {
client := redis.NewClient(&redis.Options{
Addr: addr,
Password: password,
DB: 0,
})
ctx := context.Background()
if err := client.Ping(ctx).Err(); err != nil {
return nil, fmt.Errorf("redis connection failed: %w", err)
}
return &Cache{
client: client,
ctx: ctx,
expiryTime: time.Duration(expiryMinutes) * time.Minute,
}, nil
}
func (c *Cache) Get(uri string) (*notes.Note, bool) {
key := fmt.Sprintf("post:%s", uri)
data, err := c.client.Get(c.ctx, key).Bytes()
if err != nil {
return nil, false
}
var note notes.Note
if err := json.Unmarshal(data, ¬e); err != nil {
return nil, false
}
return ¬e, true
}
func (c *Cache) Set(uri string, note *notes.Note) {
key := fmt.Sprintf("post:%s", uri)
data, err := json.Marshal(note)
if err != nil {
return
}
c.client.Set(c.ctx, key, data, c.expiryTime)
}
func (c *Cache) GetAuthor(did string) (*notes.Author, bool) {
key := fmt.Sprintf("profile:%s", did)
data, err := c.client.Get(c.ctx, key).Bytes()
if err != nil {
return nil, false
}
var author notes.Author
if err := json.Unmarshal(data, &author); err != nil {
return nil, false
}
return &author, true
}
func (c *Cache) SetAuthor(did string, author *notes.Author) {
key := fmt.Sprintf("profile:%s", did)
data, err := json.Marshal(author)
if err != nil {
return
}
c.client.Set(c.ctx, key, data, c.expiryTime)
}
func (c *Cache) GetCursor(did string) (string, bool) {
key := fmt.Sprintf("cursor:%s", did)
cursor, err := c.client.Get(c.ctx, key).Result()
if err != nil {
return "", false
}
return cursor, true
}
func (c *Cache) SetCursor(did, cursor string) {
key := fmt.Sprintf("cursor:%s", did)
if cursor == "" {
c.client.Del(c.ctx, key)
return
}
c.client.Set(c.ctx, key, cursor, 24*time.Hour)
}
func (c *Cache) GetPostsByDID(did string) ([]notes.Note, error) {
pattern := fmt.Sprintf("post:at://%s/*", did)
var posts []notes.Note
iter := c.client.Scan(c.ctx, 0, pattern, 0).Iterator()
for iter.Next(c.ctx) {
data, err := c.client.Get(c.ctx, iter.Val()).Bytes()
if err != nil {
continue
}
var note notes.Note
if err := json.Unmarshal(data, ¬e); err != nil {
continue
}
posts = append(posts, note)
}
if err := iter.Err(); err != nil {
return nil, err
}
sort.Slice(posts, func(i, j int) bool {
return posts[i].CreatedAt.After(posts[j].CreatedAt)
})
return posts, nil
}
// track oldest sent post per profile
func (c *Cache) GetOldestSent(did string) (time.Time, bool) {
key := fmt.Sprintf("oldest_sent:%s", did)
ts, err := c.client.Get(c.ctx, key).Int64()
if err != nil {
return time.Time{}, false
}
return time.Unix(ts, 0), true
}
func (c *Cache) SetOldestSent(did string, timestamp time.Time) {
key := fmt.Sprintf("oldest_sent:%s", did)
c.client.Set(c.ctx, key, timestamp.Unix(), 24*time.Hour)
}
// count posts older than timestamp for a profile
func (c *Cache) CountPostsOlderThan(did string, timestamp time.Time) (int, error) {
posts, err := c.GetPostsByDID(did)
if err != nil {
return 0, err
}
for i, p := range posts {
if p.CreatedAt.Before(timestamp) {
return len(posts) - i, nil
}
}
return 0, nil
}
func (c *Cache) Close() error {
return c.client.Close()
}
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