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72 lines
1.9 KiB
Python
72 lines
1.9 KiB
Python
import random
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from .. import exceptions
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from .base import normalize_meta_value
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from .base import Storage
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def _random_string():
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return f"{random.random():.9f}"
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class MemoryStorage(Storage):
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storage_name = "memory"
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"""
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Saves data in RAM, only useful for testing.
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"""
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def __init__(self, fileext="", **kwargs):
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if kwargs.get("collection") is not None:
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raise exceptions.UserError("MemoryStorage does not support " "collections.")
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self.items = {} # href => (etag, item)
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self.metadata = {}
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self.fileext = fileext
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super().__init__(**kwargs)
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def _get_href(self, item):
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return item.ident + self.fileext
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def list(self):
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for href, (etag, _item) in self.items.items():
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yield href, etag
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def get(self, href):
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etag, item = self.items[href]
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return item, etag
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def has(self, href):
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return href in self.items
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def upload(self, item):
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href = self._get_href(item)
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if href in self.items:
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raise exceptions.AlreadyExistingError(existing_href=href)
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etag = _random_string()
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self.items[href] = (etag, item)
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return href, etag
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def update(self, href, item, etag):
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if href not in self.items:
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raise exceptions.NotFoundError(href)
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actual_etag, _ = self.items[href]
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if etag != actual_etag:
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raise exceptions.WrongEtagError(etag, actual_etag)
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new_etag = _random_string()
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self.items[href] = (new_etag, item)
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return new_etag
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def delete(self, href, etag):
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if not self.has(href):
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raise exceptions.NotFoundError(href)
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if etag != self.items[href][0]:
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raise exceptions.WrongEtagError(etag)
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del self.items[href]
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def get_meta(self, key):
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return normalize_meta_value(self.metadata.get(key))
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def set_meta(self, key, value):
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self.metadata[key] = normalize_meta_value(value)
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