Spaces:
Sleeping
Sleeping
File size: 7,345 Bytes
67c9f93 a3a0745 67c9f93 a3a0745 67c9f93 a3a0745 67c9f93 a3a0745 67c9f93 a3a0745 67c9f93 a3a0745 67c9f93 a3a0745 260407e a3a0745 260407e a3a0745 067af89 260407e 067af89 260407e 067af89 a3a0745 67c9f93 067af89 67c9f93 a3a0745 67c9f93 | 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 | import os
from contextlib import contextmanager
from queue import Empty, Full, Queue
from threading import Lock
from typing import Iterator, Optional
from urllib.parse import parse_qs, unquote, urlparse
import pymysql
from pymysql.connections import Connection
from dotenv import load_dotenv
load_dotenv()
_pool: Optional["MySQLConnectionPool"] = None
_pool_lock = Lock()
def _get_env(name: str, default: Optional[str] = None) -> Optional[str]:
value = os.getenv(name)
if value is None:
return default
trimmed = value.strip()
return trimmed or default
def _str_to_bool(value: str) -> bool:
return value.lower() in {"1", "true", "yes", "on"}
def _parse_database_url(database_url: str) -> dict:
parsed = urlparse(database_url)
scheme = parsed.scheme.lower()
if scheme not in {"mysql", "mysql+pymysql"}:
raise RuntimeError(
"DATABASE_URL must use the mysql scheme when PyMySQL is in use"
)
database = parsed.path.lstrip("/")
if not database:
raise RuntimeError("DATABASE_URL must include the database name")
connect_kwargs = {
"host": parsed.hostname or "localhost",
"port": parsed.port or 3306,
"user": unquote(parsed.username or ""),
"password": unquote(parsed.password or ""),
"database": database,
"charset": _get_env("DB_CHARSET", "utf8mb4"),
"autocommit": True,
}
connect_timeout = _get_env("DB_CONNECT_TIMEOUT")
if connect_timeout:
connect_kwargs["connect_timeout"] = float(connect_timeout)
ssl_root_cert = _get_env("SSL_ROOT_CERT")
if ssl_root_cert:
connect_kwargs["ssl"] = {"ca": ssl_root_cert}
query_params = parse_qs(parsed.query, keep_blank_values=True)
for key, values in query_params.items():
if not values:
continue
value = values[-1]
if key == "autocommit":
connect_kwargs["autocommit"] = _str_to_bool(value)
elif key == "charset":
connect_kwargs["charset"] = value
elif key == "connect_timeout":
connect_kwargs["connect_timeout"] = float(value)
else:
connect_kwargs[key] = value
return {key: val for key, val in connect_kwargs.items() if val not in {None, ""}}
def _build_connect_kwargs_from_env() -> Optional[dict]:
host = _get_env("DB_HOST")
database = _get_env("DB_NAME") or _get_env("DB_DATABASE")
if not host or not database:
return None
connect_kwargs = {
"host": host,
"port": int(_get_env("DB_PORT", "3306")),
"user": _get_env("DB_USER", ""),
"password": _get_env("DB_PASSWORD", ""),
"database": database,
"charset": _get_env("DB_CHARSET", "utf8mb4"),
"autocommit": _str_to_bool(_get_env("DB_AUTOCOMMIT", "true")),
}
connect_timeout = _get_env("DB_CONNECT_TIMEOUT")
if connect_timeout:
connect_kwargs["connect_timeout"] = float(connect_timeout)
ssl_root_cert = _get_env("SSL_ROOT_CERT")
if ssl_root_cert:
connect_kwargs["ssl"] = {"ca": ssl_root_cert}
return {key: val for key, val in connect_kwargs.items() if val not in {None, ""}}
class MySQLConnectionPool:
"""Simple thread-safe connection pool for PyMySQL."""
def __init__(self, connect_kwargs: dict, min_size: int, max_size: int) -> None:
if min_size < 0:
raise ValueError("min_size must be non-negative")
if max_size < 1:
raise ValueError("max_size must be at least 1")
if min_size > max_size:
raise ValueError("min_size cannot exceed max_size")
self._connect_kwargs = connect_kwargs
self._available: Queue[Connection] = Queue(maxsize=max_size)
self._lock = Lock()
self._max_size = max_size
self._total_created = 0
self._closed = False
for _ in range(min_size):
conn = self._create_connection()
self._available.put(conn)
self._total_created += 1
def _create_connection(self) -> Connection:
if self._closed:
raise RuntimeError("Connection pool is closed")
return pymysql.connect(**self._connect_kwargs)
def connection(self):
return _PooledConnectionContext(self)
def acquire(self) -> Connection:
while True:
try:
conn = self._available.get_nowait()
except Empty:
with self._lock:
if self._total_created < self._max_size:
conn = self._create_connection()
self._total_created += 1
return conn
conn = self._available.get()
if conn.open:
conn.ping(reconnect=True)
conn.autocommit(True)
return conn
self._discard_connection(conn)
def release(self, conn: Connection) -> None:
if self._closed:
self._discard_connection(conn)
return
if not conn.open:
self._discard_connection(conn)
return
try:
self._available.put_nowait(conn)
except Full:
self._discard_connection(conn)
def close(self) -> None:
self._closed = True
while True:
try:
conn = self._available.get_nowait()
except Empty:
break
self._discard_connection(conn)
def _discard_connection(self, conn: Connection) -> None:
try:
conn.close()
finally:
with self._lock:
if self._total_created > 0:
self._total_created -= 1
class _PooledConnectionContext:
def __init__(self, pool: MySQLConnectionPool) -> None:
self._pool = pool
self._conn: Optional[Connection] = None
def __enter__(self) -> Connection:
self._conn = self._pool.acquire()
return self._conn
def __exit__(self, exc_type, exc, tb) -> None:
if self._conn is not None:
self._pool.release(self._conn)
self._conn = None
def _ensure_pool() -> MySQLConnectionPool:
global _pool
if _pool is not None:
return _pool
with _pool_lock:
if _pool is not None:
return _pool
database_url = _get_env("DATABASE_URL")
if database_url:
connect_kwargs = _parse_database_url(database_url)
else:
connect_kwargs = _build_connect_kwargs_from_env()
if connect_kwargs is None:
raise RuntimeError(
"DATABASE_URL or DB_HOST and DB_NAME must be set in the environment"
)
min_size = int(_get_env("DB_POOL_MIN_SIZE", "1"))
max_size = int(_get_env("DB_POOL_MAX_SIZE", "5"))
pool = MySQLConnectionPool(
connect_kwargs=connect_kwargs,
min_size=min_size,
max_size=max_size,
)
_pool = pool
return pool
@contextmanager
def get_connection() -> Iterator[Connection]:
pool = _ensure_pool()
with pool.connection() as conn:
yield conn
def close_pool() -> None:
global _pool
with _pool_lock:
if _pool is not None:
_pool.close()
_pool = None
|