87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package cache
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import (
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"context"
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"encoding/json"
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"time"
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"mal/internal/db"
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"mal/internal/observability"
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)
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type Store struct {
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db db.Querier
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metrics *observability.Metrics
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}
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func NewStore(queries db.Querier, metrics *observability.Metrics) *Store {
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return &Store{db: queries, metrics: metrics}
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}
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// Get retrieves a fresh cached value by key.
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func (s *Store) Get(parentCtx context.Context, key string, out any) bool {
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ctx, cancel := context.WithTimeout(parentCtx, 2*time.Second)
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defer cancel()
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data, err := s.db.GetJikanCache(ctx, key)
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if err != nil {
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s.metrics.ObserveCache("jikan", "miss")
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return false
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}
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if err := json.Unmarshal([]byte(data), out); err != nil {
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s.metrics.ObserveCache("jikan", "miss")
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return false
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}
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s.metrics.ObserveCache("jikan", "hit")
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return true
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}
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// GetStale retrieves an expired-but-available cached value by key.
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func (s *Store) GetStale(parentCtx context.Context, key string, out any) bool {
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ctx, cancel := context.WithTimeout(parentCtx, 2*time.Second)
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defer cancel()
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data, err := s.db.GetJikanCacheStale(ctx, key)
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if err != nil {
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s.metrics.ObserveCache("jikan_stale", "miss")
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return false
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}
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if err := json.Unmarshal([]byte(data), out); err != nil {
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s.metrics.ObserveCache("jikan_stale", "miss")
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return false
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}
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s.metrics.ObserveCache("jikan_stale", "hit")
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return true
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}
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// Set stores data in cache with the specified TTL.
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func (s *Store) Set(parentCtx context.Context, key string, data any, ttl time.Duration) {
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ctx, cancel := context.WithTimeout(parentCtx, 2*time.Second)
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defer cancel()
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bytes, err := json.Marshal(data)
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if err != nil {
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return
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}
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err = s.db.SetJikanCache(ctx, db.SetJikanCacheParams{
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Key: key,
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Data: string(bytes),
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ExpiresAt: time.Now().Add(ttl),
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})
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if err != nil {
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observability.LogJSON(
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observability.LogLevelError,
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"jikan_cache_set",
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"jikan",
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"",
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map[string]any{"cache_key": key},
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err,
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)
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}
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}
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