fix: remove global sync.Once to prevent DB state leakage in fuzz tests

internal/fuzz/db.go

@@ -1,89 +1,81 @@
 package fuzz
 
 import (
-	"sync"
-
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
 )
 
-var (
-	fuzzDBOnce sync.Once
-	fuzzDB     *gorm.DB
-	fuzzDBErr  error
-)
-
 func GetFuzzDB() (*gorm.DB, error) {
-	fuzzDBOnce.Do(func() {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
-		dbName := "file:memdb_fuzz?mode=memory&cache=shared&_journal_mode=WAL&_synchronous=NORMAL"
+		Logger: logger.Default.LogMode(logger.Silent),
-		fuzzDB, fuzzDBErr = gorm.Open(sqlite.Open(dbName), &gorm.Config{
-			Logger: logger.Default.LogMode(logger.Silent),
-		})
-		if fuzzDBErr == nil {
-			fuzzDBErr = fuzzDB.Exec(`
-				CREATE TABLE IF NOT EXISTS users (
-					id INTEGER PRIMARY KEY AUTOINCREMENT,
-					username TEXT UNIQUE NOT NULL,
-					email TEXT UNIQUE NOT NULL,
-					password TEXT NOT NULL,
-					email_verified INTEGER DEFAULT 0 NOT NULL,
-					email_verified_at DATETIME,
-					email_verification_token TEXT,
-					email_verification_sent_at DATETIME,
-					password_reset_token TEXT,
-					password_reset_sent_at DATETIME,
-					password_reset_expires_at DATETIME,
-					locked INTEGER DEFAULT 0,
-					session_version INTEGER DEFAULT 1 NOT NULL,
-					created_at DATETIME,
-					updated_at DATETIME,
-					deleted_at DATETIME
-				);
-				CREATE TABLE IF NOT EXISTS posts (
-					id INTEGER PRIMARY KEY AUTOINCREMENT,
-					title TEXT NOT NULL,
-					url TEXT UNIQUE,
-					content TEXT,
-					author_id INTEGER,
-					author_name TEXT,
-					up_votes INTEGER DEFAULT 0,
-					down_votes INTEGER DEFAULT 0,
-					score INTEGER DEFAULT 0,
-					created_at DATETIME,
-					updated_at DATETIME,
-					deleted_at DATETIME,
-					FOREIGN KEY(author_id) REFERENCES users(id)
-				);
-				CREATE TABLE IF NOT EXISTS votes (
-					id INTEGER PRIMARY KEY AUTOINCREMENT,
-					user_id INTEGER,
-					post_id INTEGER NOT NULL,
-					type TEXT NOT NULL,
-					vote_hash TEXT,
-					created_at DATETIME,
-					updated_at DATETIME,
-					FOREIGN KEY(user_id) REFERENCES users(id),
-					FOREIGN KEY(post_id) REFERENCES posts(id)
-				);
-				CREATE TABLE IF NOT EXISTS account_deletion_requests (
-					id INTEGER PRIMARY KEY AUTOINCREMENT,
-					user_id INTEGER NOT NULL,
-					token_hash TEXT UNIQUE NOT NULL,
-					expires_at DATETIME NOT NULL,
-					created_at DATETIME,
-					FOREIGN KEY(user_id) REFERENCES users(id)
-				);
-				CREATE TABLE IF NOT EXISTS refresh_tokens (
-					id INTEGER PRIMARY KEY AUTOINCREMENT,
-					user_id INTEGER NOT NULL,
-					token_hash TEXT UNIQUE NOT NULL,
-					expires_at DATETIME NOT NULL,
-					created_at DATETIME,
-					FOREIGN KEY(user_id) REFERENCES users(id)
-				);
-			`).Error
-		}
 	})
-	return fuzzDB, fuzzDBErr
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.Exec(`
+		CREATE TABLE IF NOT EXISTS users (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			username TEXT UNIQUE NOT NULL,
+			email TEXT UNIQUE NOT NULL,
+			password TEXT NOT NULL,
+			email_verified INTEGER DEFAULT 0 NOT NULL,
+			email_verified_at DATETIME,
+			email_verification_token TEXT,
+			email_verification_sent_at DATETIME,
+			password_reset_token TEXT,
+			password_reset_sent_at DATETIME,
+			password_reset_expires_at DATETIME,
+			locked INTEGER DEFAULT 0,
+			session_version INTEGER DEFAULT 1 NOT NULL,
+			created_at DATETIME,
+			updated_at DATETIME,
+			deleted_at DATETIME
+		);
+		CREATE TABLE IF NOT EXISTS posts (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			title TEXT NOT NULL,
+			url TEXT UNIQUE,
+			content TEXT,
+			author_id INTEGER,
+			author_name TEXT,
+			up_votes INTEGER DEFAULT 0,
+			down_votes INTEGER DEFAULT 0,
+			score INTEGER DEFAULT 0,
+			created_at DATETIME,
+			updated_at DATETIME,
+			deleted_at DATETIME,
+			FOREIGN KEY(author_id) REFERENCES users(id)
+		);
+		CREATE TABLE IF NOT EXISTS votes (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER,
+			post_id INTEGER NOT NULL,
+			type TEXT NOT NULL,
+			vote_hash TEXT,
+			created_at DATETIME,
+			updated_at DATETIME,
+			FOREIGN KEY(user_id) REFERENCES users(id),
+			FOREIGN KEY(post_id) REFERENCES posts(id)
+		);
+		CREATE TABLE IF NOT EXISTS account_deletion_requests (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL,
+			token_hash TEXT UNIQUE NOT NULL,
+			expires_at DATETIME NOT NULL,
+			created_at DATETIME,
+			FOREIGN KEY(user_id) REFERENCES users(id)
+		);
+		CREATE TABLE IF NOT EXISTS refresh_tokens (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL,
+			token_hash TEXT UNIQUE NOT NULL,
+			expires_at DATETIME NOT NULL,
+			created_at DATETIME,
+			FOREIGN KEY(user_id) REFERENCES users(id)
+		);
+	`).Error
+
+	return db, err
 }