niquests-cache 0.2.0

Cached niquests sessions with pluggable storage backends.

niquests-cache

Cached niquests sessions with pluggable storage backends. SQLite is the default; filesystem and in-memory backends are also built in.

Installation

pip install niquests-cache

Example usage

The cached_session() helper returns a CachedSession or AsyncCachedSession whose cache database is platformdirs.user_cache_path(app_name, appauthor=False) / 'http.sqlite'. If you omit app_name, niquests-cache is used. Only successful GET and HEAD responses are written; the default time-to-live is 10 minutes (expire_after= on the helper, or per-request— see below).

Sync helper (default app name and TTL):

from niquests_cache import cached_session

session = cached_session()
response = session.get('https://httpbin.org/get')
response.raise_for_status()

Custom application name for user_cache_path:

from niquests_cache import cached_session

session = cached_session(app_name='my-application')
response = session.get('https://httpbin.org/get')
response.raise_for_status()

Plain niquests session with no caching:

from niquests_cache import cached_session

session = cached_session(no_cache=True)

Construct CachedSession when you need an explicit cache name or TTL:

from datetime import timedelta
from pathlib import Path

from niquests_cache import CachedSession

with CachedSession(cache_name=Path('.cache') / 'http',
                   expire_after=timedelta(hours=1)) as session:
    response = session.get('https://httpbin.org/get')
    response.raise_for_status()

Async helper (use an async context manager):

import asyncio
from datetime import timedelta

from niquests_cache import cached_session

async def main() -> None:
    async with cached_session(aio=True, expire_after=timedelta(minutes=30)) as session:
        response = await session.get('https://httpbin.org/get')
        response.raise_for_status()

asyncio.run(main())

Or construct AsyncCachedSession directly:

import asyncio
from datetime import timedelta
from pathlib import Path

from niquests_cache import AsyncCachedSession

async def main() -> None:
    async with AsyncCachedSession(cache_name=Path('.cache') / 'http',
                                  expire_after=timedelta(hours=1)) as session:
        response = await session.get('https://httpbin.org/get')
        response.raise_for_status()

asyncio.run(main())

Choosing a backend

Pass backend= as one of the built-in aliases ('sqlite' (default), 'filesystem', 'memory') or a BaseBackend instance:

from niquests_cache import CachedSession
from niquests_cache.backends import FileCache, MemoryBackend

# Filesystem backend with custom cache directory:
session = CachedSession(backend='filesystem', cache_name='./fs-cache')

# In-memory (per-process) cache:
session = CachedSession(backend=MemoryBackend())

# FileCache with the pickle serializer (preserves binary content natively):
session = CachedSession(backend=FileCache('./fs-cache', serializer='pickle'))

The AsyncCachedSession uses aiosqlite for SQLite and anyio for filesystem I/O so async requests do not block the event loop.

Per-request controls

request() accepts expire_after, only_if_cached, refresh, and force_refresh per call:

# Bypass the cache read and replace any stored entry:
session.get('https://httpbin.org/get', force_refresh=True)

# Return a synthesised 504 if the entry is missing instead of going to the network:
session.get('https://httpbin.org/get', only_if_cached=True)

# Override the session-wide TTL for one request:
session.get('https://httpbin.org/get', expire_after=60)

Cache key behaviour

By default the cache key is sha256(method + url + '') — request headers are not part of the key. Pass match_headers=True to include all session/request headers, or match_headers=('Accept', 'Accept-Language') to include only the listed names. Strip query-string parameters from the key with ignored_parameters=('access_token', ...). Provide a key_fn= to replace key generation entirely.

Settings

All session settings live on the mutable session.settings dataclass (niquests_cache.settings.CacheSettings); change them at runtime, for example session.settings.expire_after = 360 or session.settings.read_only = True. Use with session.cache_disabled(): to suspend caching for a block.