Initial commit for Cache Plugin

pkg/plugin/implementation/cache/cache.go

@@ -0,0 +1,77 @@
+package cache
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type Config struct {
+	Addr string
+}
+
+type Cache struct {
+	client *redis.Client
+}
+
+var (
+	ErrEmptyConfig       = errors.New("empty config")
+	ErrAddrMissing       = errors.New("missing required field 'Addr'")
+	ErrCredentialMissing = errors.New("missing Redis credentials in environment")
+	ErrConnectionFail    = errors.New("failed to connect to Redis")
+)
+
+func validate(cfg *Config) error {
+	if cfg == nil {
+		return ErrEmptyConfig
+	}
+	if cfg.Addr == "" {
+		return ErrAddrMissing
+	}
+	return nil
+}
+
+func New(ctx context.Context, cfg *Config) (*Cache, func() error, error) {
+	if err := validate(cfg); err != nil {
+		return nil, nil, err
+	}
+
+	// Get password from environment variable
+	password := os.Getenv("REDIS_PASSWORD")
+	// Allow empty password for local testing
+	// if password == "" {
+	// 	return nil, nil, ErrCredentialMissing
+	// }
+
+	client := redis.NewClient(&redis.Options{
+		Addr:     cfg.Addr,
+		Password: password,
+		DB:       0, // Always use default DB 0
+	})
+
+	if _, err := client.Ping(ctx).Result(); err != nil {
+		return nil, nil, fmt.Errorf("%w: %v", ErrConnectionFail, err)
+	}
+
+	return &Cache{client: client}, client.Close, nil
+}
+
+func (c *Cache) Get(ctx context.Context, key string) (string, error) {
+	return c.client.Get(ctx, key).Result()
+}
+
+func (c *Cache) Set(ctx context.Context, key, value string, ttl time.Duration) error {
+	return c.client.Set(ctx, key, value, ttl).Err()
+}
+
+func (c *Cache) Delete(ctx context.Context, key string) error {
+	return c.client.Del(ctx, key).Err()
+}
+
+func (c *Cache) Clear(ctx context.Context) error {
+	return c.client.FlushDB(ctx).Err()
+}