refactor: Update database connection functions and configurations

internal/auth/internal/db/db.go

@@ -1,3 +1,4 @@
+// Package db provides functionality to connect to a SQLite database and Redis.
 package db
 
 import (
@@ -8,37 +9,61 @@ import (
 	"github.com/go-redis/redis/v8"
 )
 
+// Config holds the configuration for database connections.
 type Config struct {
+	// DatabaseURL is the connection string for the SQLite database.
 	DatabaseURL string
-	RedisURL    string
+
+	// RedisURL is the connection string for Redis.
+	RedisURL string
 }
 
-// ConnectEnt establishes a connection to the SQLite database and returns an ent client
+// ConnectEnt establishes a connection to the SQLite database and returns an ent client.
+// It also runs the auto migration tool to create the schema resources.
+//
+// Parameters:
+//   - cfg: Config struct containing the DatabaseURL.
+//
+// Returns:
+//   - *ent.Client: A pointer to the ent client for database operations.
+//   - error: An error if the connection or schema creation fails, nil otherwise.
 func ConnectEnt(cfg Config) (*ent.Client, error) {
+	// Open a connection to the SQLite database
 	client, err := ent.Open("sqlite3", cfg.DatabaseURL)
 	if err != nil {
 		return nil, fmt.Errorf("failed opening connection to sqlite: %v", err)
 	}
 
-	// Run the auto migration tool
+	// Run the auto migration tool to create schema resources
 	if err := client.Schema.Create(context.Background()); err != nil {
 		return nil, fmt.Errorf("failed creating schema resources: %v", err)
 	}
 
 	return client, nil
 }
 
-// ConnectRedis establishes a connection to Redis
+// ConnectRedis establishes a connection to Redis.
+//
+// Parameters:
+//   - redisURL: The URL for connecting to Redis.
+//
+// Returns:
+//   - *redis.Client: A pointer to the Redis client for Redis operations.
+//   - error: An error if the connection fails, nil otherwise.
 func ConnectRedis(redisURL string) (*redis.Client, error) {
+	// Parse the Redis URL
 	opts, err := redis.ParseURL(redisURL)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse Redis URL: %v", err)
 	}
 
+	// Create a new Redis client
 	client := redis.NewClient(opts)
+
+	// Ping Redis to check the connection
 	if err := client.Ping(context.Background()).Err(); err != nil {
 		return nil, fmt.Errorf("failed to connect to Redis: %v", err)
 	}
 
 	return client, nil
-}
+}