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from gridfs import GridFS
from pymongo import MongoClient
from . import get_valid_kwargs
from .base import BaseCache, BaseStorage
from .mongo import MongoDict
class GridFSCache(BaseCache):
"""GridFS cache backend.
Use this backend to store documents greater than 16MB.
Example:
>>> requests_cache.install_cache(backend='gridfs')
Or:
>>> from pymongo import MongoClient
>>> requests_cache.install_cache(backend='gridfs', connection=MongoClient('alternate-host'))
Args:
db_name: Database name
connection: :py:class:`pymongo.MongoClient` object to reuse instead of creating a new one
kwargs: Additional keyword arguments for :py:class:`pymongo.MongoClient`
"""
def __init__(self, db_name: str, **kwargs):
super().__init__(**kwargs)
self.responses = GridFSPickleDict(db_name, **kwargs)
kwargs['connection'] = self.responses.connection
self.redirects = MongoDict(db_name, collection_name='redirects', **kwargs)
class GridFSPickleDict(BaseStorage):
"""A dictionary-like interface for a GridFS database
Args:
db_name: Database name
collection_name: Ignored; GridFS internally uses collections 'fs.files' and 'fs.chunks'
connection: :py:class:`pymongo.MongoClient` object to reuse instead of creating a new one
kwargs: Additional keyword arguments for :py:class:`pymongo.MongoClient`
"""
def __init__(self, db_name, collection_name=None, connection=None, **kwargs):
super().__init__(**kwargs)
connection_kwargs = get_valid_kwargs(MongoClient, kwargs)
self.connection = connection or MongoClient(**connection_kwargs)
self.db = self.connection[db_name]
self.fs = GridFS(self.db)
def __getitem__(self, key):
result = self.fs.find_one({'_id': key})
if result is None:
raise KeyError
return self.deserialize(result.read())
def __setitem__(self, key, item):
try:
self.__delitem__(key)
except KeyError:
pass
self.fs.put(self.serialize(item), **{'_id': key})
def __delitem__(self, key):
res = self.fs.find_one({'_id': key})
if res is None:
raise KeyError
self.fs.delete(res._id)
def __len__(self):
return self.db['fs.files'].estimated_document_count()
def __iter__(self):
for d in self.fs.find():
yield d._id
def clear(self):
self.db['fs.files'].drop()
self.db['fs.chunks'].drop()
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