Added redis module as seperate component of session

Author: PythonHacker24

internal/session/redis/redis.go

@@ -0,0 +1,66 @@
+package redis 
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+/* defines the methods to expose (for dependency injection) */
+type RedisClient interface {
+	Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error
+	Get(ctx context.Context, key string) (string, error)
+	HSet(ctx context.Context, key string, values ...interface{}) *redis.IntCmd
+	RPush(ctx context.Context, key string, value interface{}) *redis.IntCmd
+	LRange(ctx context.Context, key string, start, stop int64) *redis.StringSliceCmd
+}
+
+/* redisClient implementation */
+type redisClient struct {
+	client *redis.Client
+}
+
+/* for creating a new redis client */
+func NewRedisClient(address, password string, db int) (RedisClient, error) {
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     address,
+		Password: password,
+		DB:       db,
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	
+	if err := rdb.Ping(ctx).Err(); err != nil {
+		return nil, fmt.Errorf("could not connect to Redis: %w", err)
+	}
+
+	return &redisClient{client: rdb}, nil
+}
+
+/* Set sets a key-value pair in Redis */
+func (r *redisClient) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) error {
+	return r.client.Set(ctx, key, value, expiration).Err()
+}
+
+/* retrieves a value by key from Redis */
+func (r *redisClient) Get(ctx context.Context, key string) (string, error) {
+	return r.client.Get(ctx, key).Result()
+}
+
+/* for pushing multiple elements in Redis */
+func (r *redisClient) RPush(ctx context.Context, key string, value interface{}) *redis.IntCmd {
+	return r.client.RPush(ctx, key, value)
+}
+
+/* retrieve a subset of the list stored at a specified key */
+func (r *redisClient) LRange(ctx context.Context, key string, start, stop int64) *redis.StringSliceCmd {
+	return r.client.LRange(ctx, key, start, stop)
+}
+
+/* hash set for redis */
+func (r *redisClient) HSet(ctx context.Context, key string, values ...interface{}) *redis.IntCmd {
+	return r.client.HSet(ctx, key, values...)
+}