174 lines
7.1 KiB
Python
174 lines
7.1 KiB
Python
"""Shared HTTP session helpers for all monitors.
|
|
|
|
A single aioweb_tls TLSSession (curl_cffi backend, random client fingerprint per
|
|
session) replaces the old aiohttp/curl_cffi split. send_request wraps aioweb's
|
|
request_with_retries, adding per-request proxy rotation and old-style JSON/text
|
|
return values so monitor call sites change as little as possible.
|
|
"""
|
|
|
|
import asyncio
|
|
import logging
|
|
import random
|
|
|
|
from aioproxies import AioProxies
|
|
from aioweb import Response
|
|
from aioweb_tls import CurlCffi, TLSSession
|
|
from monitor_utils.constants import (
|
|
CLIENT_IDENTIFIERS,
|
|
MAX_CURL_HANDLES,
|
|
RETRY_LIMIT,
|
|
SESSION_CLOSE_TIMEOUT_SECONDS,
|
|
TIMEOUT_SECONDS,
|
|
)
|
|
|
|
LOGGER = logging.getLogger(__name__)
|
|
|
|
|
|
class BoundedCloseSession(TLSSession):
|
|
"""A TLSSession whose close cannot outlive SESSION_CLOSE_TIMEOUT_SECONDS.
|
|
|
|
curl_cffi's close awaits the multi handle with no timeout of its own, so a
|
|
wedged transfer parks whatever is closing the session. A caller-side budget
|
|
cannot cover this reliably: asyncio.timeout cancels its task once, so a
|
|
cycle budget that has already fired leaves the close running as a fresh,
|
|
uncancelled await, and the process parks in the `async with` exit that was
|
|
meant to reclaim it.
|
|
|
|
Bounding it here keeps that guarantee attached to the session itself, so
|
|
every `async with get_default_session(...)` gets it without the call site
|
|
having to arrange anything. Abandoning a session leaks its handle until the
|
|
process restarts, which is strictly better than a wedged monitor.
|
|
|
|
Known inconsistency, deliberate: an abandoned session reports itself closed
|
|
while its curl handle is still open. TLSSession.close sets _closed before
|
|
awaiting the backend, so _is_closed() returns True on this path, and since
|
|
aioweb's __del__ only warns when _is_closed() is False, its leak warning is
|
|
suppressed for exactly the sessions that leaked. The "session close exceeded
|
|
budget" error logged below is therefore the only signal that it happened —
|
|
alert on it rather than on the library's warning.
|
|
|
|
Correcting the flag would mean overriding _is_closed too, and aioweb_tls is
|
|
a third-party library: this class deliberately overrides one documented
|
|
lifecycle method and nothing private, so an upstream release has one narrow
|
|
way to break it. A stale flag on a session discarded the same instant is the
|
|
cheaper side of that trade.
|
|
"""
|
|
|
|
async def close(self) -> None:
|
|
try:
|
|
async with asyncio.timeout(SESSION_CLOSE_TIMEOUT_SECONDS):
|
|
await super().close()
|
|
except TimeoutError:
|
|
LOGGER.error(
|
|
"session close exceeded budget, abandoning session",
|
|
extra={"timeout": SESSION_CLOSE_TIMEOUT_SECONDS},
|
|
)
|
|
|
|
|
|
def get_default_session(
|
|
proxies: AioProxies,
|
|
headers: dict | None = None,
|
|
timeout: int = TIMEOUT_SECONDS,
|
|
max_clients: int = MAX_CURL_HANDLES,
|
|
) -> TLSSession:
|
|
"""Return a TLSSession impersonating a random client fingerprint.
|
|
|
|
Fingerprint rotation lives here so every monitor rotates the same way; the
|
|
caller owns the session lifetime via ``async with``.
|
|
|
|
Cookies are not set here: aioweb has no constructor cookie path, and
|
|
monitors usually obtain them at runtime, so call session.set_cookie(name,
|
|
value, domain=...) where they are fetched (e.g. a pre_task_func) instead.
|
|
|
|
Args:
|
|
proxies: Pool attached to the session as proxy_pool, which send_request
|
|
rotates through per request. Required so a session can never send
|
|
un-proxied.
|
|
headers: Default headers merged into every request by aioweb. Use for
|
|
monitor-wide static headers; per-request headers still go through
|
|
send_request. The curl_cffi impersonation already supplies a
|
|
matching User-Agent, so one is not defaulted here.
|
|
timeout: Total request timeout in seconds, defaulting to TIMEOUT_SECONDS.
|
|
aioweb's own default is only 10s, so this restores the wider budget
|
|
the old sessions used and slow retailers depend on.
|
|
max_clients: Size of the curl handle pool, defaulting to
|
|
MAX_CURL_HANDLES. This is a hard concurrency ceiling: a request
|
|
finding the pool empty waits in pop_curl's untimed pool.get(), and
|
|
`timeout` does not cover that wait, only the transfer after
|
|
checkout. Keep it at or above the monitor's real fan-out (the sum
|
|
of its pagination semaphores plus any unsemaphored per-cycle
|
|
requests) so the wait is never reachable.
|
|
|
|
Returns:
|
|
A BoundedCloseSession (a TLSSession whose close is bounded) over a
|
|
curl_cffi backend with a random impersonation, with the proxy pool
|
|
attached as proxy_pool.
|
|
"""
|
|
impersonate = random.choice(CLIENT_IDENTIFIERS)
|
|
session = BoundedCloseSession(
|
|
backend=CurlCffi(impersonate=impersonate),
|
|
headers=headers,
|
|
timeout=timeout,
|
|
max_clients=max_clients,
|
|
)
|
|
session.proxy_pool = proxies
|
|
return session
|
|
|
|
|
|
async def send_request(
|
|
session: TLSSession,
|
|
url: str,
|
|
method: str,
|
|
*,
|
|
params: dict | None = None,
|
|
json_data: dict | None = None,
|
|
data: dict | None = None,
|
|
headers: dict | None = None,
|
|
) -> Response:
|
|
"""Send a request through a TLSSession with retries and proxy rotation.
|
|
|
|
Wraps aioweb's request_with_retries, which retries transport errors,
|
|
timeouts, and retryable statuses (429/5xx) up to RETRY_LIMIT attempts with
|
|
exponential backoff. The next proxy is drawn from the pool per call and
|
|
applied to both schemes. A non-2xx response or a fully failed request raises
|
|
AiowebError, an expected task error, so a failed fetch surfaces the same way
|
|
the old HTTPError path did. On success the aioweb Response is returned for
|
|
the caller to read via response.json(), response.text(), etc.
|
|
|
|
Args:
|
|
session: The TLSSession to send through.
|
|
url: Request URL.
|
|
method: HTTP method.
|
|
params: Query parameters.
|
|
json_data: JSON body. A dict here is sent as JSON with the
|
|
application/json content-type set by aioweb.
|
|
data: Raw request body, passed through unchanged (e.g. a url-encoded
|
|
form string). The caller owns the matching content-type via headers.
|
|
A dict is JSON-encoded by aioweb, so use json_data for JSON bodies.
|
|
headers: Per-request headers merged over the session defaults.
|
|
|
|
Returns:
|
|
The aioweb Response, guaranteed 2xx (non-2xx raises). Read the body with
|
|
response.json() (dict/list, or None if not valid JSON) or
|
|
response.text().
|
|
|
|
Raises:
|
|
AiowebError: On a non-2xx response or after all retries fail.
|
|
"""
|
|
|
|
proxy_url = session.proxy_pool.next().url()
|
|
proxy = {"http": proxy_url, "https": proxy_url}
|
|
|
|
body = json_data if json_data is not None else data
|
|
response = await session.request_with_retries(
|
|
method.upper(),
|
|
url,
|
|
params=params,
|
|
data=body,
|
|
headers=headers,
|
|
proxies=proxy,
|
|
attempts=RETRY_LIMIT,
|
|
)
|
|
response.raise_for_status()
|
|
return response
|