872 lines
29 KiB
Python
872 lines
29 KiB
Python
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import asyncio
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import io
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import logging
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import re
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import weakref
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from copy import copy
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from urllib.parse import urlparse
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import aiohttp
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import yarl
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from fsspec.asyn import AbstractAsyncStreamedFile, AsyncFileSystem, sync, sync_wrapper
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from fsspec.callbacks import DEFAULT_CALLBACK
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from fsspec.exceptions import FSTimeoutError
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from fsspec.spec import AbstractBufferedFile
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from fsspec.utils import (
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DEFAULT_BLOCK_SIZE,
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glob_translate,
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isfilelike,
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nullcontext,
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tokenize,
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)
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from ..caching import AllBytes
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# https://stackoverflow.com/a/15926317/3821154
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ex = re.compile(r"""<(a|A)\s+(?:[^>]*?\s+)?(href|HREF)=["'](?P<url>[^"']+)""")
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ex2 = re.compile(r"""(?P<url>http[s]?://[-a-zA-Z0-9@:%_+.~#?&/=]+)""")
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logger = logging.getLogger("fsspec.http")
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async def get_client(**kwargs):
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return aiohttp.ClientSession(**kwargs)
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class HTTPFileSystem(AsyncFileSystem):
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"""
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Simple File-System for fetching data via HTTP(S)
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``ls()`` is implemented by loading the parent page and doing a regex
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match on the result. If simple_link=True, anything of the form
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"http(s)://server.com/stuff?thing=other"; otherwise only links within
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HTML href tags will be used.
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"""
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sep = "/"
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def __init__(
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self,
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simple_links=True,
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block_size=None,
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same_scheme=True,
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size_policy=None,
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cache_type="bytes",
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cache_options=None,
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asynchronous=False,
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loop=None,
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client_kwargs=None,
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get_client=get_client,
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encoded=False,
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**storage_options,
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):
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"""
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NB: if this is called async, you must await set_client
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Parameters
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----------
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block_size: int
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Blocks to read bytes; if 0, will default to raw requests file-like
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objects instead of HTTPFile instances
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simple_links: bool
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If True, will consider both HTML <a> tags and anything that looks
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like a URL; if False, will consider only the former.
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same_scheme: True
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When doing ls/glob, if this is True, only consider paths that have
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http/https matching the input URLs.
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size_policy: this argument is deprecated
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client_kwargs: dict
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Passed to aiohttp.ClientSession, see
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https://docs.aiohttp.org/en/stable/client_reference.html
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For example, ``{'auth': aiohttp.BasicAuth('user', 'pass')}``
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get_client: Callable[..., aiohttp.ClientSession]
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A callable which takes keyword arguments and constructs
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an aiohttp.ClientSession. It's state will be managed by
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the HTTPFileSystem class.
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storage_options: key-value
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Any other parameters passed on to requests
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cache_type, cache_options: defaults used in open
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"""
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super().__init__(self, asynchronous=asynchronous, loop=loop, **storage_options)
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self.block_size = block_size if block_size is not None else DEFAULT_BLOCK_SIZE
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self.simple_links = simple_links
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self.same_schema = same_scheme
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self.cache_type = cache_type
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self.cache_options = cache_options
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self.client_kwargs = client_kwargs or {}
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self.get_client = get_client
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self.encoded = encoded
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self.kwargs = storage_options
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self._session = None
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# Clean caching-related parameters from `storage_options`
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# before propagating them as `request_options` through `self.kwargs`.
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# TODO: Maybe rename `self.kwargs` to `self.request_options` to make
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# it clearer.
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request_options = copy(storage_options)
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self.use_listings_cache = request_options.pop("use_listings_cache", False)
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request_options.pop("listings_expiry_time", None)
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request_options.pop("max_paths", None)
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request_options.pop("skip_instance_cache", None)
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self.kwargs = request_options
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@property
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def fsid(self):
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return "http"
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def encode_url(self, url):
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return yarl.URL(url, encoded=self.encoded)
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@staticmethod
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def close_session(loop, session):
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if loop is not None and loop.is_running():
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try:
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sync(loop, session.close, timeout=0.1)
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return
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except (TimeoutError, FSTimeoutError, NotImplementedError):
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pass
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connector = getattr(session, "_connector", None)
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if connector is not None:
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# close after loop is dead
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connector._close()
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async def set_session(self):
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if self._session is None:
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self._session = await self.get_client(loop=self.loop, **self.client_kwargs)
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if not self.asynchronous:
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weakref.finalize(self, self.close_session, self.loop, self._session)
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return self._session
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@classmethod
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def _strip_protocol(cls, path):
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"""For HTTP, we always want to keep the full URL"""
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return path
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@classmethod
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def _parent(cls, path):
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# override, since _strip_protocol is different for URLs
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par = super()._parent(path)
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if len(par) > 7: # "http://..."
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return par
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return ""
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async def _ls_real(self, url, detail=True, **kwargs):
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# ignoring URL-encoded arguments
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kw = self.kwargs.copy()
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kw.update(kwargs)
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logger.debug(url)
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session = await self.set_session()
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async with session.get(self.encode_url(url), **self.kwargs) as r:
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self._raise_not_found_for_status(r, url)
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try:
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text = await r.text()
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if self.simple_links:
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links = ex2.findall(text) + [u[2] for u in ex.findall(text)]
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else:
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links = [u[2] for u in ex.findall(text)]
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except UnicodeDecodeError:
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links = [] # binary, not HTML
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out = set()
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parts = urlparse(url)
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for l in links:
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if isinstance(l, tuple):
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l = l[1]
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if l.startswith("/") and len(l) > 1:
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# absolute URL on this server
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l = f"{parts.scheme}://{parts.netloc}{l}"
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if l.startswith("http"):
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if self.same_schema and l.startswith(url.rstrip("/") + "/"):
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out.add(l)
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elif l.replace("https", "http").startswith(
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url.replace("https", "http").rstrip("/") + "/"
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):
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# allowed to cross http <-> https
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out.add(l)
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else:
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if l not in ["..", "../"]:
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# Ignore FTP-like "parent"
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out.add("/".join([url.rstrip("/"), l.lstrip("/")]))
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if not out and url.endswith("/"):
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out = await self._ls_real(url.rstrip("/"), detail=False)
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if detail:
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return [
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{
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"name": u,
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"size": None,
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"type": "directory" if u.endswith("/") else "file",
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}
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for u in out
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]
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else:
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return sorted(out)
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async def _ls(self, url, detail=True, **kwargs):
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if self.use_listings_cache and url in self.dircache:
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out = self.dircache[url]
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else:
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out = await self._ls_real(url, detail=detail, **kwargs)
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self.dircache[url] = out
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return out
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ls = sync_wrapper(_ls)
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def _raise_not_found_for_status(self, response, url):
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"""
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Raises FileNotFoundError for 404s, otherwise uses raise_for_status.
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"""
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if response.status == 404:
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raise FileNotFoundError(url)
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response.raise_for_status()
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async def _cat_file(self, url, start=None, end=None, **kwargs):
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kw = self.kwargs.copy()
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kw.update(kwargs)
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logger.debug(url)
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if start is not None or end is not None:
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if start == end:
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return b""
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headers = kw.pop("headers", {}).copy()
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headers["Range"] = await self._process_limits(url, start, end)
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kw["headers"] = headers
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session = await self.set_session()
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async with session.get(self.encode_url(url), **kw) as r:
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out = await r.read()
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self._raise_not_found_for_status(r, url)
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return out
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async def _get_file(
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self, rpath, lpath, chunk_size=5 * 2**20, callback=DEFAULT_CALLBACK, **kwargs
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):
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kw = self.kwargs.copy()
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kw.update(kwargs)
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logger.debug(rpath)
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session = await self.set_session()
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async with session.get(self.encode_url(rpath), **kw) as r:
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try:
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size = int(r.headers["content-length"])
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except (ValueError, KeyError):
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size = None
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callback.set_size(size)
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self._raise_not_found_for_status(r, rpath)
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if isfilelike(lpath):
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outfile = lpath
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else:
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outfile = open(lpath, "wb") # noqa: ASYNC101
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try:
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chunk = True
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while chunk:
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chunk = await r.content.read(chunk_size)
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outfile.write(chunk)
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callback.relative_update(len(chunk))
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finally:
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if not isfilelike(lpath):
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outfile.close()
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async def _put_file(
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self,
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lpath,
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rpath,
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chunk_size=5 * 2**20,
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callback=DEFAULT_CALLBACK,
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method="post",
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**kwargs,
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):
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async def gen_chunks():
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# Support passing arbitrary file-like objects
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# and use them instead of streams.
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if isinstance(lpath, io.IOBase):
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context = nullcontext(lpath)
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use_seek = False # might not support seeking
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else:
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context = open(lpath, "rb") # noqa: ASYNC101
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use_seek = True
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with context as f:
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if use_seek:
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callback.set_size(f.seek(0, 2))
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f.seek(0)
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else:
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callback.set_size(getattr(f, "size", None))
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chunk = f.read(chunk_size)
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while chunk:
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yield chunk
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callback.relative_update(len(chunk))
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chunk = f.read(chunk_size)
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kw = self.kwargs.copy()
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kw.update(kwargs)
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session = await self.set_session()
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method = method.lower()
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if method not in ("post", "put"):
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raise ValueError(
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f"method has to be either 'post' or 'put', not: {method!r}"
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)
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meth = getattr(session, method)
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async with meth(self.encode_url(rpath), data=gen_chunks(), **kw) as resp:
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self._raise_not_found_for_status(resp, rpath)
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async def _exists(self, path, **kwargs):
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kw = self.kwargs.copy()
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kw.update(kwargs)
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try:
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logger.debug(path)
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session = await self.set_session()
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r = await session.get(self.encode_url(path), **kw)
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async with r:
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return r.status < 400
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except aiohttp.ClientError:
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return False
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async def _isfile(self, path, **kwargs):
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return await self._exists(path, **kwargs)
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def _open(
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self,
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path,
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mode="rb",
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block_size=None,
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autocommit=None, # XXX: This differs from the base class.
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cache_type=None,
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cache_options=None,
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size=None,
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**kwargs,
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):
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"""Make a file-like object
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Parameters
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----------
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path: str
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Full URL with protocol
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mode: string
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must be "rb"
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block_size: int or None
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Bytes to download in one request; use instance value if None. If
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zero, will return a streaming Requests file-like instance.
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kwargs: key-value
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Any other parameters, passed to requests calls
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"""
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if mode != "rb":
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raise NotImplementedError
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block_size = block_size if block_size is not None else self.block_size
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kw = self.kwargs.copy()
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kw["asynchronous"] = self.asynchronous
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kw.update(kwargs)
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size = size or self.info(path, **kwargs)["size"]
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session = sync(self.loop, self.set_session)
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if block_size and size:
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return HTTPFile(
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self,
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path,
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session=session,
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block_size=block_size,
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mode=mode,
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size=size,
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cache_type=cache_type or self.cache_type,
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cache_options=cache_options or self.cache_options,
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loop=self.loop,
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**kw,
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)
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else:
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return HTTPStreamFile(
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self,
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path,
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mode=mode,
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loop=self.loop,
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session=session,
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**kw,
|
||
|
|
)
|
||
|
|
|
||
|
|
async def open_async(self, path, mode="rb", size=None, **kwargs):
|
||
|
|
session = await self.set_session()
|
||
|
|
if size is None:
|
||
|
|
try:
|
||
|
|
size = (await self._info(path, **kwargs))["size"]
|
||
|
|
except FileNotFoundError:
|
||
|
|
pass
|
||
|
|
return AsyncStreamFile(
|
||
|
|
self,
|
||
|
|
path,
|
||
|
|
loop=self.loop,
|
||
|
|
session=session,
|
||
|
|
size=size,
|
||
|
|
**kwargs,
|
||
|
|
)
|
||
|
|
|
||
|
|
def ukey(self, url):
|
||
|
|
"""Unique identifier; assume HTTP files are static, unchanging"""
|
||
|
|
return tokenize(url, self.kwargs, self.protocol)
|
||
|
|
|
||
|
|
async def _info(self, url, **kwargs):
|
||
|
|
"""Get info of URL
|
||
|
|
|
||
|
|
Tries to access location via HEAD, and then GET methods, but does
|
||
|
|
not fetch the data.
|
||
|
|
|
||
|
|
It is possible that the server does not supply any size information, in
|
||
|
|
which case size will be given as None (and certain operations on the
|
||
|
|
corresponding file will not work).
|
||
|
|
"""
|
||
|
|
info = {}
|
||
|
|
session = await self.set_session()
|
||
|
|
|
||
|
|
for policy in ["head", "get"]:
|
||
|
|
try:
|
||
|
|
info.update(
|
||
|
|
await _file_info(
|
||
|
|
self.encode_url(url),
|
||
|
|
size_policy=policy,
|
||
|
|
session=session,
|
||
|
|
**self.kwargs,
|
||
|
|
**kwargs,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
if info.get("size") is not None:
|
||
|
|
break
|
||
|
|
except Exception as exc:
|
||
|
|
if policy == "get":
|
||
|
|
# If get failed, then raise a FileNotFoundError
|
||
|
|
raise FileNotFoundError(url) from exc
|
||
|
|
logger.debug("", exc_info=exc)
|
||
|
|
|
||
|
|
return {"name": url, "size": None, **info, "type": "file"}
|
||
|
|
|
||
|
|
async def _glob(self, path, maxdepth=None, **kwargs):
|
||
|
|
"""
|
||
|
|
Find files by glob-matching.
|
||
|
|
|
||
|
|
This implementation is idntical to the one in AbstractFileSystem,
|
||
|
|
but "?" is not considered as a character for globbing, because it is
|
||
|
|
so common in URLs, often identifying the "query" part.
|
||
|
|
"""
|
||
|
|
if maxdepth is not None and maxdepth < 1:
|
||
|
|
raise ValueError("maxdepth must be at least 1")
|
||
|
|
import re
|
||
|
|
|
||
|
|
ends_with_slash = path.endswith("/") # _strip_protocol strips trailing slash
|
||
|
|
path = self._strip_protocol(path)
|
||
|
|
append_slash_to_dirname = ends_with_slash or path.endswith("/**")
|
||
|
|
idx_star = path.find("*") if path.find("*") >= 0 else len(path)
|
||
|
|
idx_brace = path.find("[") if path.find("[") >= 0 else len(path)
|
||
|
|
|
||
|
|
min_idx = min(idx_star, idx_brace)
|
||
|
|
|
||
|
|
detail = kwargs.pop("detail", False)
|
||
|
|
|
||
|
|
if not has_magic(path):
|
||
|
|
if await self._exists(path, **kwargs):
|
||
|
|
if not detail:
|
||
|
|
return [path]
|
||
|
|
else:
|
||
|
|
return {path: await self._info(path, **kwargs)}
|
||
|
|
else:
|
||
|
|
if not detail:
|
||
|
|
return [] # glob of non-existent returns empty
|
||
|
|
else:
|
||
|
|
return {}
|
||
|
|
elif "/" in path[:min_idx]:
|
||
|
|
min_idx = path[:min_idx].rindex("/")
|
||
|
|
root = path[: min_idx + 1]
|
||
|
|
depth = path[min_idx + 1 :].count("/") + 1
|
||
|
|
else:
|
||
|
|
root = ""
|
||
|
|
depth = path[min_idx + 1 :].count("/") + 1
|
||
|
|
|
||
|
|
if "**" in path:
|
||
|
|
if maxdepth is not None:
|
||
|
|
idx_double_stars = path.find("**")
|
||
|
|
depth_double_stars = path[idx_double_stars:].count("/") + 1
|
||
|
|
depth = depth - depth_double_stars + maxdepth
|
||
|
|
else:
|
||
|
|
depth = None
|
||
|
|
|
||
|
|
allpaths = await self._find(
|
||
|
|
root, maxdepth=depth, withdirs=True, detail=True, **kwargs
|
||
|
|
)
|
||
|
|
|
||
|
|
pattern = glob_translate(path + ("/" if ends_with_slash else ""))
|
||
|
|
pattern = re.compile(pattern)
|
||
|
|
|
||
|
|
out = {
|
||
|
|
p: info
|
||
|
|
for p, info in sorted(allpaths.items())
|
||
|
|
if pattern.match(
|
||
|
|
(
|
||
|
|
p + "/"
|
||
|
|
if append_slash_to_dirname and info["type"] == "directory"
|
||
|
|
else p
|
||
|
|
)
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
if detail:
|
||
|
|
return out
|
||
|
|
else:
|
||
|
|
return list(out)
|
||
|
|
|
||
|
|
async def _isdir(self, path):
|
||
|
|
# override, since all URLs are (also) files
|
||
|
|
try:
|
||
|
|
return bool(await self._ls(path))
|
||
|
|
except (FileNotFoundError, ValueError):
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
class HTTPFile(AbstractBufferedFile):
|
||
|
|
"""
|
||
|
|
A file-like object pointing to a remove HTTP(S) resource
|
||
|
|
|
||
|
|
Supports only reading, with read-ahead of a predermined block-size.
|
||
|
|
|
||
|
|
In the case that the server does not supply the filesize, only reading of
|
||
|
|
the complete file in one go is supported.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
url: str
|
||
|
|
Full URL of the remote resource, including the protocol
|
||
|
|
session: aiohttp.ClientSession or None
|
||
|
|
All calls will be made within this session, to avoid restarting
|
||
|
|
connections where the server allows this
|
||
|
|
block_size: int or None
|
||
|
|
The amount of read-ahead to do, in bytes. Default is 5MB, or the value
|
||
|
|
configured for the FileSystem creating this file
|
||
|
|
size: None or int
|
||
|
|
If given, this is the size of the file in bytes, and we don't attempt
|
||
|
|
to call the server to find the value.
|
||
|
|
kwargs: all other key-values are passed to requests calls.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
fs,
|
||
|
|
url,
|
||
|
|
session=None,
|
||
|
|
block_size=None,
|
||
|
|
mode="rb",
|
||
|
|
cache_type="bytes",
|
||
|
|
cache_options=None,
|
||
|
|
size=None,
|
||
|
|
loop=None,
|
||
|
|
asynchronous=False,
|
||
|
|
**kwargs,
|
||
|
|
):
|
||
|
|
if mode != "rb":
|
||
|
|
raise NotImplementedError("File mode not supported")
|
||
|
|
self.asynchronous = asynchronous
|
||
|
|
self.url = url
|
||
|
|
self.session = session
|
||
|
|
self.details = {"name": url, "size": size, "type": "file"}
|
||
|
|
super().__init__(
|
||
|
|
fs=fs,
|
||
|
|
path=url,
|
||
|
|
mode=mode,
|
||
|
|
block_size=block_size,
|
||
|
|
cache_type=cache_type,
|
||
|
|
cache_options=cache_options,
|
||
|
|
**kwargs,
|
||
|
|
)
|
||
|
|
self.loop = loop
|
||
|
|
|
||
|
|
def read(self, length=-1):
|
||
|
|
"""Read bytes from file
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
length: int
|
||
|
|
Read up to this many bytes. If negative, read all content to end of
|
||
|
|
file. If the server has not supplied the filesize, attempting to
|
||
|
|
read only part of the data will raise a ValueError.
|
||
|
|
"""
|
||
|
|
if (
|
||
|
|
(length < 0 and self.loc == 0) # explicit read all
|
||
|
|
# but not when the size is known and fits into a block anyways
|
||
|
|
and not (self.size is not None and self.size <= self.blocksize)
|
||
|
|
):
|
||
|
|
self._fetch_all()
|
||
|
|
if self.size is None:
|
||
|
|
if length < 0:
|
||
|
|
self._fetch_all()
|
||
|
|
else:
|
||
|
|
length = min(self.size - self.loc, length)
|
||
|
|
return super().read(length)
|
||
|
|
|
||
|
|
async def async_fetch_all(self):
|
||
|
|
"""Read whole file in one shot, without caching
|
||
|
|
|
||
|
|
This is only called when position is still at zero,
|
||
|
|
and read() is called without a byte-count.
|
||
|
|
"""
|
||
|
|
logger.debug(f"Fetch all for {self}")
|
||
|
|
if not isinstance(self.cache, AllBytes):
|
||
|
|
r = await self.session.get(self.fs.encode_url(self.url), **self.kwargs)
|
||
|
|
async with r:
|
||
|
|
r.raise_for_status()
|
||
|
|
out = await r.read()
|
||
|
|
self.cache = AllBytes(
|
||
|
|
size=len(out), fetcher=None, blocksize=None, data=out
|
||
|
|
)
|
||
|
|
self.size = len(out)
|
||
|
|
|
||
|
|
_fetch_all = sync_wrapper(async_fetch_all)
|
||
|
|
|
||
|
|
def _parse_content_range(self, headers):
|
||
|
|
"""Parse the Content-Range header"""
|
||
|
|
s = headers.get("Content-Range", "")
|
||
|
|
m = re.match(r"bytes (\d+-\d+|\*)/(\d+|\*)", s)
|
||
|
|
if not m:
|
||
|
|
return None, None, None
|
||
|
|
|
||
|
|
if m[1] == "*":
|
||
|
|
start = end = None
|
||
|
|
else:
|
||
|
|
start, end = [int(x) for x in m[1].split("-")]
|
||
|
|
total = None if m[2] == "*" else int(m[2])
|
||
|
|
return start, end, total
|
||
|
|
|
||
|
|
async def async_fetch_range(self, start, end):
|
||
|
|
"""Download a block of data
|
||
|
|
|
||
|
|
The expectation is that the server returns only the requested bytes,
|
||
|
|
with HTTP code 206. If this is not the case, we first check the headers,
|
||
|
|
and then stream the output - if the data size is bigger than we
|
||
|
|
requested, an exception is raised.
|
||
|
|
"""
|
||
|
|
logger.debug(f"Fetch range for {self}: {start}-{end}")
|
||
|
|
kwargs = self.kwargs.copy()
|
||
|
|
headers = kwargs.pop("headers", {}).copy()
|
||
|
|
headers["Range"] = f"bytes={start}-{end - 1}"
|
||
|
|
logger.debug(f"{self.url} : {headers['Range']}")
|
||
|
|
r = await self.session.get(
|
||
|
|
self.fs.encode_url(self.url), headers=headers, **kwargs
|
||
|
|
)
|
||
|
|
async with r:
|
||
|
|
if r.status == 416:
|
||
|
|
# range request outside file
|
||
|
|
return b""
|
||
|
|
r.raise_for_status()
|
||
|
|
|
||
|
|
# If the server has handled the range request, it should reply
|
||
|
|
# with status 206 (partial content). But we'll guess that a suitable
|
||
|
|
# Content-Range header or a Content-Length no more than the
|
||
|
|
# requested range also mean we have got the desired range.
|
||
|
|
response_is_range = (
|
||
|
|
r.status == 206
|
||
|
|
or self._parse_content_range(r.headers)[0] == start
|
||
|
|
or int(r.headers.get("Content-Length", end + 1)) <= end - start
|
||
|
|
)
|
||
|
|
|
||
|
|
if response_is_range:
|
||
|
|
# partial content, as expected
|
||
|
|
out = await r.read()
|
||
|
|
elif start > 0:
|
||
|
|
raise ValueError(
|
||
|
|
"The HTTP server doesn't appear to support range requests. "
|
||
|
|
"Only reading this file from the beginning is supported. "
|
||
|
|
"Open with block_size=0 for a streaming file interface."
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
# Response is not a range, but we want the start of the file,
|
||
|
|
# so we can read the required amount anyway.
|
||
|
|
cl = 0
|
||
|
|
out = []
|
||
|
|
while True:
|
||
|
|
chunk = await r.content.read(2**20)
|
||
|
|
# data size unknown, let's read until we have enough
|
||
|
|
if chunk:
|
||
|
|
out.append(chunk)
|
||
|
|
cl += len(chunk)
|
||
|
|
if cl > end - start:
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
out = b"".join(out)[: end - start]
|
||
|
|
return out
|
||
|
|
|
||
|
|
_fetch_range = sync_wrapper(async_fetch_range)
|
||
|
|
|
||
|
|
def __reduce__(self):
|
||
|
|
return (
|
||
|
|
reopen,
|
||
|
|
(
|
||
|
|
self.fs,
|
||
|
|
self.url,
|
||
|
|
self.mode,
|
||
|
|
self.blocksize,
|
||
|
|
self.cache.name if self.cache else "none",
|
||
|
|
self.size,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def reopen(fs, url, mode, blocksize, cache_type, size=None):
|
||
|
|
return fs.open(
|
||
|
|
url, mode=mode, block_size=blocksize, cache_type=cache_type, size=size
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
magic_check = re.compile("([*[])")
|
||
|
|
|
||
|
|
|
||
|
|
def has_magic(s):
|
||
|
|
match = magic_check.search(s)
|
||
|
|
return match is not None
|
||
|
|
|
||
|
|
|
||
|
|
class HTTPStreamFile(AbstractBufferedFile):
|
||
|
|
def __init__(self, fs, url, mode="rb", loop=None, session=None, **kwargs):
|
||
|
|
self.asynchronous = kwargs.pop("asynchronous", False)
|
||
|
|
self.url = url
|
||
|
|
self.loop = loop
|
||
|
|
self.session = session
|
||
|
|
if mode != "rb":
|
||
|
|
raise ValueError
|
||
|
|
self.details = {"name": url, "size": None}
|
||
|
|
super().__init__(fs=fs, path=url, mode=mode, cache_type="none", **kwargs)
|
||
|
|
|
||
|
|
async def cor():
|
||
|
|
r = await self.session.get(self.fs.encode_url(url), **kwargs).__aenter__()
|
||
|
|
self.fs._raise_not_found_for_status(r, url)
|
||
|
|
return r
|
||
|
|
|
||
|
|
self.r = sync(self.loop, cor)
|
||
|
|
|
||
|
|
def seek(self, loc, whence=0):
|
||
|
|
if loc == 0 and whence == 1:
|
||
|
|
return
|
||
|
|
if loc == self.loc and whence == 0:
|
||
|
|
return
|
||
|
|
raise ValueError("Cannot seek streaming HTTP file")
|
||
|
|
|
||
|
|
async def _read(self, num=-1):
|
||
|
|
out = await self.r.content.read(num)
|
||
|
|
self.loc += len(out)
|
||
|
|
return out
|
||
|
|
|
||
|
|
read = sync_wrapper(_read)
|
||
|
|
|
||
|
|
async def _close(self):
|
||
|
|
self.r.close()
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
asyncio.run_coroutine_threadsafe(self._close(), self.loop)
|
||
|
|
super().close()
|
||
|
|
|
||
|
|
def __reduce__(self):
|
||
|
|
return reopen, (self.fs, self.url, self.mode, self.blocksize, self.cache.name)
|
||
|
|
|
||
|
|
|
||
|
|
class AsyncStreamFile(AbstractAsyncStreamedFile):
|
||
|
|
def __init__(
|
||
|
|
self, fs, url, mode="rb", loop=None, session=None, size=None, **kwargs
|
||
|
|
):
|
||
|
|
self.url = url
|
||
|
|
self.session = session
|
||
|
|
self.r = None
|
||
|
|
if mode != "rb":
|
||
|
|
raise ValueError
|
||
|
|
self.details = {"name": url, "size": None}
|
||
|
|
self.kwargs = kwargs
|
||
|
|
super().__init__(fs=fs, path=url, mode=mode, cache_type="none")
|
||
|
|
self.size = size
|
||
|
|
|
||
|
|
async def read(self, num=-1):
|
||
|
|
if self.r is None:
|
||
|
|
r = await self.session.get(
|
||
|
|
self.fs.encode_url(self.url), **self.kwargs
|
||
|
|
).__aenter__()
|
||
|
|
self.fs._raise_not_found_for_status(r, self.url)
|
||
|
|
self.r = r
|
||
|
|
out = await self.r.content.read(num)
|
||
|
|
self.loc += len(out)
|
||
|
|
return out
|
||
|
|
|
||
|
|
async def close(self):
|
||
|
|
if self.r is not None:
|
||
|
|
self.r.close()
|
||
|
|
self.r = None
|
||
|
|
await super().close()
|
||
|
|
|
||
|
|
|
||
|
|
async def get_range(session, url, start, end, file=None, **kwargs):
|
||
|
|
# explicit get a range when we know it must be safe
|
||
|
|
kwargs = kwargs.copy()
|
||
|
|
headers = kwargs.pop("headers", {}).copy()
|
||
|
|
headers["Range"] = f"bytes={start}-{end - 1}"
|
||
|
|
r = await session.get(url, headers=headers, **kwargs)
|
||
|
|
r.raise_for_status()
|
||
|
|
async with r:
|
||
|
|
out = await r.read()
|
||
|
|
if file:
|
||
|
|
with open(file, "r+b") as f: # noqa: ASYNC101
|
||
|
|
f.seek(start)
|
||
|
|
f.write(out)
|
||
|
|
else:
|
||
|
|
return out
|
||
|
|
|
||
|
|
|
||
|
|
async def _file_info(url, session, size_policy="head", **kwargs):
|
||
|
|
"""Call HEAD on the server to get details about the file (size/checksum etc.)
|
||
|
|
|
||
|
|
Default operation is to explicitly allow redirects and use encoding
|
||
|
|
'identity' (no compression) to get the true size of the target.
|
||
|
|
"""
|
||
|
|
logger.debug("Retrieve file size for %s", url)
|
||
|
|
kwargs = kwargs.copy()
|
||
|
|
ar = kwargs.pop("allow_redirects", True)
|
||
|
|
head = kwargs.get("headers", {}).copy()
|
||
|
|
head["Accept-Encoding"] = "identity"
|
||
|
|
kwargs["headers"] = head
|
||
|
|
|
||
|
|
info = {}
|
||
|
|
if size_policy == "head":
|
||
|
|
r = await session.head(url, allow_redirects=ar, **kwargs)
|
||
|
|
elif size_policy == "get":
|
||
|
|
r = await session.get(url, allow_redirects=ar, **kwargs)
|
||
|
|
else:
|
||
|
|
raise TypeError(f'size_policy must be "head" or "get", got {size_policy}')
|
||
|
|
async with r:
|
||
|
|
r.raise_for_status()
|
||
|
|
|
||
|
|
# TODO:
|
||
|
|
# recognise lack of 'Accept-Ranges',
|
||
|
|
# or 'Accept-Ranges': 'none' (not 'bytes')
|
||
|
|
# to mean streaming only, no random access => return None
|
||
|
|
if "Content-Length" in r.headers:
|
||
|
|
# Some servers may choose to ignore Accept-Encoding and return
|
||
|
|
# compressed content, in which case the returned size is unreliable.
|
||
|
|
if "Content-Encoding" not in r.headers or r.headers["Content-Encoding"] in [
|
||
|
|
"identity",
|
||
|
|
"",
|
||
|
|
]:
|
||
|
|
info["size"] = int(r.headers["Content-Length"])
|
||
|
|
elif "Content-Range" in r.headers:
|
||
|
|
info["size"] = int(r.headers["Content-Range"].split("/")[1])
|
||
|
|
|
||
|
|
if "Content-Type" in r.headers:
|
||
|
|
info["mimetype"] = r.headers["Content-Type"].partition(";")[0]
|
||
|
|
|
||
|
|
info["url"] = str(r.url)
|
||
|
|
|
||
|
|
for checksum_field in ["ETag", "Content-MD5", "Digest"]:
|
||
|
|
if r.headers.get(checksum_field):
|
||
|
|
info[checksum_field] = r.headers[checksum_field]
|
||
|
|
|
||
|
|
return info
|
||
|
|
|
||
|
|
|
||
|
|
async def _file_size(url, session=None, *args, **kwargs):
|
||
|
|
if session is None:
|
||
|
|
session = await get_client()
|
||
|
|
info = await _file_info(url, session=session, *args, **kwargs)
|
||
|
|
return info.get("size")
|
||
|
|
|
||
|
|
|
||
|
|
file_size = sync_wrapper(_file_size)
|