Spaces:
Running
Running
File size: 19,065 Bytes
2cb9dec |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 |
# import logging
# from typing import Dict, List, Optional, AsyncGenerator
# from pydantic import BaseSettings, PostgresDsn
# import pg8000
# from pg8000 import Connection, Cursor
# from pg8000.exceptions import DatabaseError
# import asyncio
# from contextlib import asynccontextmanager
# from dataclasses import dataclass
# from threading import Lock
# # Set up structured logging
# logging.basicConfig(
# level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
# )
# logger = logging.getLogger(__name__)
# class DatabaseSettings(BaseSettings):
# db_url: PostgresDsn
# pool_size: int = 5
# class Config:
# env_file = ".env"
# @dataclass
# class DatabaseConfig:
# username: str
# password: str
# hostname: str
# port: int
# database: str
# class DatabaseError(Exception):
# """Custom exception for database errors."""
# pass
# class Database:
# def __init__(self, db_url: str, pool_size: int):
# self.db_url = db_url
# self.pool_size = pool_size
# self.pool: List[Connection] = []
# self.lock = Lock()
# self.config = self._parse_db_url()
# def _parse_db_url(self) -> DatabaseConfig:
# """Parse the database URL into components."""
# result = urlparse(self.db_url)
# return DatabaseConfig(
# username=result.username,
# password=result.password,
# hostname=result.hostname,
# port=result.port or 5432,
# database=result.path.lstrip("/"),
# )
# async def connect(self) -> None:
# """Create a connection pool."""
# try:
# for _ in range(self.pool_size):
# conn = await self._create_connection()
# self.pool.append(conn)
# logger.info(
# f"Database connection pool created with {self.pool_size} connections."
# )
# except DatabaseError as e:
# logger.error(f"Failed to create database connection pool: {e}")
# raise
# async def _create_connection(self) -> Connection:
# """Create a single database connection."""
# try:
# conn = pg8000.connect(
# user=self.config.username,
# password=self.config.password,
# host=self.config.hostname,
# port=self.config.port,
# database=self.config.database,
# )
# return conn
# except DatabaseError as e:
# logger.error(f"Failed to create database connection: {e}")
# raise DatabaseError("Failed to create database connection.")
# async def disconnect(self) -> None:
# """Close all connections in the pool."""
# with self.lock:
# for conn in self.pool:
# conn.close()
# self.pool.clear()
# logger.info("Database connection pool closed.")
# @asynccontextmanager
# async def get_connection(self) -> AsyncGenerator[Connection, None]:
# """Acquire a connection from the pool."""
# with self.lock:
# if not self.pool:
# raise DatabaseError("Database connection pool is empty.")
# conn = self.pool.pop()
# try:
# yield conn
# finally:
# with self.lock:
# self.pool.append(conn)
# async def fetch(self, query: str, *args) -> List[Dict]:
# """
# Execute a SELECT query and return the results as a list of dictionaries.
# Args:
# query (str): The SQL query to execute.
# *args: Query parameters.
# Returns:
# List[Dict]: A list of dictionaries where keys are column names and values are column values.
# """
# try:
# async with self.get_connection() as conn:
# cursor: Cursor = conn.cursor()
# cursor.execute(query, args)
# rows = cursor.fetchall()
# columns = [desc[0] for desc in cursor.description]
# return [dict(zip(columns, row)) for row in rows]
# except DatabaseError as e:
# logger.error(f"Error executing query: {query}. Error: {e}")
# raise DatabaseError(f"Failed to execute query: {query}")
# async def execute(self, query: str, *args) -> None:
# """
# Execute an INSERT, UPDATE, or DELETE query.
# Args:
# query (str): The SQL query to execute.
# *args: Query parameters.
# """
# try:
# async with self.get_connection() as conn:
# cursor: Cursor = conn.cursor()
# cursor.execute(query, args)
# conn.commit()
# except DatabaseError as e:
# logger.error(f"Error executing query: {query}. Error: {e}")
# raise DatabaseError(f"Failed to execute query: {query}")
# # Dependency to get the database instance
# async def get_db() -> AsyncGenerator[Database, None]:
# settings = DatabaseSettings()
# db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
# await db.connect()
# try:
# yield db
# finally:
# await db.disconnect()
# # Example usage
# if __name__ == "__main__":
# async def main():
# settings = DatabaseSettings()
# db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
# await db.connect()
# try:
# # Example query
# query = """
# SELECT
# ppt.type AS product_type,
# pc.name AS product_category
# FROM
# product_producttype ppt
# INNER JOIN
# product_category pc
# ON
# ppt.category_id = pc.id
# """
# result = await db.fetch(query)
# print(result)
# finally:
# await db.disconnect()
# asyncio.run(main())
# import logging
# from urllib.parse import urlparse
# from typing import Dict, List, Optional, AsyncGenerator
# from pydantic_settings import BaseSettings
# from pydantic import PostgresDsn
# import pg8000
# from pg8000 import Connection, Cursor
# from pg8000.exceptions import DatabaseError
# import asyncio
# from contextlib import asynccontextmanager
# from dataclasses import dataclass
# from threading import Lock
# # Set up structured logging
# logging.basicConfig(
# level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
# )
# logger = logging.getLogger(__name__)
# class DatabaseSettings(BaseSettings):
# db_url: PostgresDsn
# pool_size: int = 5
# class Config:
# env_file = ".env"
# @dataclass
# class DatabaseConfig:
# username: str
# password: str
# hostname: str
# port: int
# database: str
# class DatabaseError(Exception):
# """Custom exception for database errors."""
# pass
# class Database:
# def __init__(self, db_url: str, pool_size: int):
# self.db_url = db_url
# self.pool_size = pool_size
# self.pool: List[Connection] = []
# self.lock = Lock()
# self.config = self._parse_db_url()
# def _parse_db_url(self) -> DatabaseConfig:
# """Parse the database URL into components."""
# # Convert PostgresDsn to a string
# db_url_str = str(self.db_url)
# result = urlparse(db_url_str)
# return DatabaseConfig(
# username=result.username,
# password=result.password,
# hostname=result.hostname,
# port=result.port or 5432,
# database=result.path.lstrip("/"),
# )
# async def connect(self) -> None:
# """Create a connection pool."""
# try:
# for _ in range(self.pool_size):
# conn = await self._create_connection()
# self.pool.append(conn)
# logger.info(
# f"Database connection pool created with {self.pool_size} connections."
# )
# except DatabaseError as e:
# logger.error(f"Failed to create database connection pool: {e}")
# raise
# async def _create_connection(self) -> Connection:
# """Create a single database connection."""
# try:
# conn = pg8000.connect(
# user=self.config.username,
# password=self.config.password,
# host=self.config.hostname,
# port=self.config.port,
# database=self.config.database,
# )
# return conn
# except DatabaseError as e:
# logger.error(f"Failed to create database connection: {e}")
# raise DatabaseError("Failed to create database connection.")
# async def disconnect(self) -> None:
# """Close all connections in the pool."""
# with self.lock:
# for conn in self.pool:
# conn.close()
# self.pool.clear()
# logger.info("Database connection pool closed.")
# @asynccontextmanager
# async def get_connection(self) -> AsyncGenerator[Connection, None]:
# """Acquire a connection from the pool."""
# with self.lock:
# if not self.pool:
# raise DatabaseError("Database connection pool is empty.")
# conn = self.pool.pop()
# try:
# yield conn
# finally:
# with self.lock:
# self.pool.append(conn)
# async def fetch(self, query: str, *args) -> List[Dict]:
# """
# Execute a SELECT query and return the results as a list of dictionaries.
# Args:
# query (str): The SQL query to execute.
# *args: Query parameters.
# Returns:
# List[Dict]: A list of dictionaries where keys are column names and values are column values.
# """
# try:
# async with self.get_connection() as conn:
# cursor: Cursor = conn.cursor()
# cursor.execute(query, args)
# rows = cursor.fetchall()
# columns = [desc[0] for desc in cursor.description]
# return [dict(zip(columns, row)) for row in rows]
# except DatabaseError as e:
# logger.error(f"Error executing query: {query}. Error: {e}")
# raise DatabaseError(f"Failed to execute query: {query}")
# async def execute(self, query: str, *args) -> None:
# """
# Execute an INSERT, UPDATE, or DELETE query.
# Args:
# query (str): The SQL query to execute.
# *args: Query parameters.
# """
# try:
# async with self.get_connection() as conn:
# cursor: Cursor = conn.cursor()
# cursor.execute(query, args)
# conn.commit()
# except DatabaseError as e:
# logger.error(f"Error executing query: {query}. Error: {e}")
# raise DatabaseError(f"Failed to execute query: {query}")
# # Dependency to get the database instance
# async def get_db() -> AsyncGenerator[Database, None]:
# settings = DatabaseSettings()
# db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
# await db.connect()
# try:
# yield db
# finally:
# await db.disconnect()
# # Example usage
# if __name__ == "__main__":
# async def main():
# settings = DatabaseSettings()
# db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
# await db.connect()
# try:
# # Example query
# query = "SELECT * FROM your_table LIMIT 10"
# query = """
# SELECT
# ppt.type AS product_type,
# pc.name AS product_category
# FROM
# product_producttype ppt
# INNER JOIN
# product_category pc
# ON
# ppt.category_id = pc.id
# """
# result = await db.fetch(query)
# print(result)
# finally:
# await db.disconnect()
# asyncio.run(main())
import logging
from typing import AsyncGenerator, List, Optional, Dict
from pydantic_settings import BaseSettings
from pydantic import PostgresDsn
import pg8000
from pg8000 import Connection
from pg8000.exceptions import DatabaseError as Pg8000DatabaseError
import asyncio
from contextlib import asynccontextmanager
from threading import Lock
from urllib.parse import urlparse
# Set up structured logging
logging.basicConfig(
level=logging.INFO, format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)
class DatabaseSettings(BaseSettings):
db_url: PostgresDsn
pool_size: int = 5 # Default pool size is 5
class Config:
env_file = ".env"
# Custom database errors
class DatabaseError(Exception):
"""Base exception for database errors."""
pass
class ConnectionError(DatabaseError):
"""Exception raised when a database connection fails."""
pass
class PoolExhaustedError(DatabaseError):
"""Exception raised when the connection pool is exhausted."""
pass
class QueryExecutionError(DatabaseError):
"""Exception raised when a query execution fails."""
pass
class HealthCheckError(DatabaseError):
"""Exception raised when a health check fails."""
pass
class Database:
def __init__(self, db_url: PostgresDsn, pool_size: int):
self.db_url = db_url
self.pool_size = pool_size
self.pool: List[Connection] = []
self.lock = Lock()
async def connect(self) -> None:
"""Create a connection pool."""
try:
# Convert PostgresDsn to a string
db_url_str = str(self.db_url)
result = urlparse(db_url_str)
for _ in range(self.pool_size):
conn = pg8000.connect(
user=result.username,
password=result.password,
host=result.hostname,
port=result.port or 5432,
database=result.path.lstrip("/"),
)
self.pool.append(conn)
logger.info(
f"Database connection pool created with {self.pool_size} connections."
)
except Pg8000DatabaseError as e:
logger.error(f"Failed to create database connection pool: {e}")
raise ConnectionError("Failed to create database connection pool.") from e
async def disconnect(self) -> None:
"""Close all connections in the pool."""
with self.lock:
for conn in self.pool:
conn.close()
self.pool.clear()
logger.info("Database connection pool closed.")
@asynccontextmanager
async def get_connection(self) -> AsyncGenerator[Connection, None]:
"""Acquire a connection from the pool."""
with self.lock:
if not self.pool:
logger.error("Connection pool is exhausted.")
raise PoolExhaustedError("No available connections in the pool.")
conn = self.pool.pop()
try:
yield conn
except Pg8000DatabaseError as e:
logger.error(f"Connection error: {e}")
raise ConnectionError("Failed to use database connection.") from e
finally:
with self.lock:
self.pool.append(conn)
async def fetch(self, query: str, *args) -> List[Dict]:
"""
Execute a SELECT query and return the results as a list of dictionaries.
Args:
query (str): The SQL query to execute.
*args: Query parameters.
Returns:
List[Dict]: A list of dictionaries where keys are column names and values are column values.
Raises:
QueryExecutionError: If the query execution fails.
"""
try:
async with self.get_connection() as conn:
cursor = conn.cursor()
cursor.execute(query, args)
rows = cursor.fetchall()
columns = [desc[0] for desc in cursor.description]
return [dict(zip(columns, row)) for row in rows]
except Pg8000DatabaseError as e:
logger.error(f"Query execution failed: {e}")
raise QueryExecutionError(f"Failed to execute query: {query}") from e
async def execute(self, query: str, *args) -> None:
"""
Execute an INSERT, UPDATE, or DELETE query.
Args:
query (str): The SQL query to execute.
*args: Query parameters.
Raises:
QueryExecutionError: If the query execution fails.
"""
try:
async with self.get_connection() as conn:
cursor = conn.cursor()
cursor.execute(query, args)
conn.commit()
except Pg8000DatabaseError as e:
logger.error(f"Query execution failed: {e}")
raise QueryExecutionError(f"Failed to execute query: {query}") from e
async def health_check(self) -> bool:
"""
Perform a health check by executing a simple query (e.g., SELECT 1).
Returns:
bool: True if the database is healthy, False otherwise.
Raises:
HealthCheckError: If the health check fails.
"""
try:
async with self.get_connection() as conn:
cursor = conn.cursor()
cursor.execute("SELECT 1")
result = cursor.fetchone()
cursor.close()
# Check if the result is as expected
if result and result[0] == 1:
logger.info("Database health check succeeded.")
return True
else:
logger.error("Database health check failed: Unexpected result.")
raise HealthCheckError("Unexpected result from health check query.")
except Pg8000DatabaseError as e:
logger.error(f"Health check failed: {e}")
raise HealthCheckError("Failed to perform health check.") from e
# Dependency to get the database instance
async def get_db() -> AsyncGenerator[Database, None]:
settings = DatabaseSettings()
db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
await db.connect()
try:
yield db
finally:
await db.disconnect()
# Example usage
if __name__ == "__main__":
async def main():
settings = DatabaseSettings()
db = Database(db_url=settings.db_url, pool_size=settings.pool_size)
await db.connect()
try:
# Perform a health check
is_healthy = await db.health_check()
print(f"Database health check: {'Success' if is_healthy else 'Failure'}")
except HealthCheckError as e:
print(f"Health check failed: {e}")
finally:
await db.disconnect()
asyncio.run(main())
|