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import os
import shutil
import json
from datetime import datetime
from typing import Optional
from huggingface_hub import HfApi, login
import sqlite3
import tempfile
class DatabaseManager:
def __init__(self, hf_token: Optional[str] = None, repo_id: Optional[str] = None):
"""Initialize Database Manager for Hugging Face Hub storage"""
self.repo_id = repo_id or os.getenv('REPO_ID', 'your-username/student-feedback-db')
self.hf_token = hf_token or os.getenv('HF_TOKEN')
self.db_path = 'instance/feedback_analysis.db'
self.backup_dir = 'backups'
self.is_local = not self.hf_token
os.makedirs(self.backup_dir, exist_ok=True)
if self.hf_token:
try:
login(token=self.hf_token)
self.api = HfApi()
except Exception:
self.api = None
else:
self.api = None
def sqlite_to_json(self, db_path: str) -> dict:
"""Convert SQLite database to JSON format"""
try:
conn = sqlite3.connect(db_path)
cursor = conn.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
tables = cursor.fetchall()
data = {}
for table in tables:
table_name = table[0]
if table_name in ['sqlite_sequence', 'sqlite_master']:
continue
cursor.execute(f"PRAGMA table_info({table_name})")
columns = [col[1] for col in cursor.fetchall()]
cursor.execute(f"SELECT * FROM {table_name}")
rows = cursor.fetchall()
table_data = []
for row in rows:
row_dict = {}
for i, value in enumerate(row):
if columns[i] == 'is_admin':
value = bool(value) if value is not None else False
row_dict[columns[i]] = value
table_data.append(row_dict)
data[table_name] = {
'columns': columns,
'data': table_data
}
try:
cursor.execute("SELECT * FROM sqlite_sequence")
sequence_rows = cursor.fetchall()
if sequence_rows:
sequence_data = []
for row in sequence_rows:
sequence_data.append({
'name': row[0],
'seq': row[1]
})
data['sqlite_sequence'] = {
'columns': ['name', 'seq'],
'data': sequence_data
}
except Exception:
pass
conn.close()
return data
except Exception:
return {}
def json_to_sqlite(self, json_data: dict, db_path: str):
"""Convert JSON data back to SQLite database"""
try:
if os.path.exists(db_path):
os.remove(db_path)
os.makedirs(os.path.dirname(db_path), exist_ok=True)
conn = sqlite3.connect(db_path)
cursor = conn.cursor()
for table_name, table_info in json_data.items():
if table_name in ['sqlite_sequence', 'sqlite_master']:
continue
columns = table_info['columns']
data = table_info['data']
if not columns:
continue
column_defs = []
for col in columns:
if col == 'id':
column_defs.append(f"{col} INTEGER PRIMARY KEY AUTOINCREMENT")
elif col == 'is_admin':
column_defs.append(f"{col} BOOLEAN DEFAULT 0")
else:
column_defs.append(f"{col} TEXT")
create_sql = f"CREATE TABLE IF NOT EXISTS {table_name} ({', '.join(column_defs)})"
cursor.execute(create_sql)
if data:
placeholders = ', '.join(['?' for _ in columns])
insert_sql = f"INSERT INTO {table_name} ({', '.join(columns)}) VALUES ({placeholders})"
for row in data:
values = []
for col in columns:
value = row.get(col)
if col == 'is_admin':
if isinstance(value, bool):
values.append(int(value))
elif isinstance(value, str):
values.append(1 if value.lower() in ['true', '1'] else 0)
else:
values.append(int(value) if value else 0)
else:
values.append(value)
cursor.execute(insert_sql, values)
if 'sqlite_sequence' in json_data:
sequence_data = json_data['sqlite_sequence']['data']
for seq_row in sequence_data:
table_name = seq_row.get('name')
seq_value = seq_row.get('seq')
if table_name and seq_value:
cursor.execute(f"INSERT INTO sqlite_sequence (name, seq) VALUES (?, ?)",
(table_name, seq_value))
conn.commit()
conn.close()
except Exception:
pass
def backup_database(self, force: bool = False) -> bool:
"""Backup database to Hugging Face Hub"""
if self.is_local:
return True
if not self.api or not os.path.exists(self.db_path):
return False
try:
json_data = self.sqlite_to_json(self.db_path)
if not json_data:
return False
timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
temp_file = f"{self.backup_dir}/feedback_backup_{timestamp}.json"
with open(temp_file, 'w', encoding='utf-8') as f:
json.dump(json_data, f, indent=2, ensure_ascii=False)
try:
self.api.upload_file(
path_or_fileobj=temp_file,
path_in_repo='feedback_backup.json',
repo_id=self.repo_id,
repo_type="dataset",
commit_message=f"Backup database - {timestamp}"
)
except Exception as upload_error:
if "No files have been modified" in str(upload_error):
return True
else:
raise upload_error
os.remove(temp_file)
return True
except Exception:
return False
def restore_database(self) -> bool:
"""Restore database from Hugging Face Hub"""
if not self.api:
return False
try:
temp_dir = tempfile.mkdtemp()
temp_file = os.path.join(temp_dir, 'feedback_backup.json')
self.api.hf_hub_download(
repo_id=self.repo_id,
filename='feedback_backup.json',
local_dir=temp_dir,
repo_type="dataset"
)
with open(temp_file, 'r', encoding='utf-8') as f:
json_data = json.load(f)
self.json_to_sqlite(json_data, self.db_path)
shutil.rmtree(temp_dir)
return True
except Exception:
return False
def check_database_exists(self) -> bool:
"""Check if database file exists locally"""
return os.path.exists(self.db_path)
def initialize_database_if_needed(self):
"""Initialize database from backup if local database doesn't exist"""
if not self.check_database_exists() and not self.is_local:
self.restore_database()
# Global instance
db_manager = DatabaseManager()
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