✨ It works!

ezcache.go

@@ -1,15 +1,17 @@
 package ezcache
 
 import (
-	"errors"
+	"sync"
 	"time"
 )
 
 type ezc[K comparable, V any] struct {
-	fetch   Fetcher[K, V]
-	exp     time.Duration
-	cache   map[K]V
-	setTime map[K]time.Time
+	fetch    Fetcher[K, V]
+	exp      time.Duration
+	cache    map[K]V
+	setTime  map[K]time.Time
+	lock     sync.RWMutex
+	timeLock sync.RWMutex
 }
 
 func New[K comparable, V any](fetcher Fetcher[K, V], exp time.Duration) (Cache[K, V], error) {
@@ -28,11 +30,33 @@ func New[K comparable, V any](fetcher Fetcher[K, V], exp time.Duration) (Cache[K
 	return c, nil
 }
 
-var errUnimpl = errors.New("unimplemented")
-
 func (c *ezc[K, V]) Get(key K) (V, error) {
-	var val V
-	return val, errUnimpl
+	c.timeLock.RLock()
+	setTime, ok := c.setTime[key]
+	c.timeLock.RUnlock()
+	if ok && time.Since(setTime) <= c.exp {
+		c.lock.RLock()
+		val, ok := c.cache[key]
+		c.lock.RUnlock()
+		if ok {
+			return val, nil
+		}
+	}
+
+	val, err := c.fetch(key)
+	if err != nil {
+		return val, err
+	}
+
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	c.cache[key] = val
+
+	c.timeLock.Lock()
+	defer c.timeLock.Unlock()
+	c.setTime[key] = time.Now()
+
+	return val, nil
 }
 
 func (c *ezc[K, V]) SetFetcher(f Fetcher[K, V]) error {