diff --git a/swh/fuse/fs/artifact.py b/swh/fuse/fs/artifact.py index 5f24b54..7d882f6 100644 --- a/swh/fuse/fs/artifact.py +++ b/swh/fuse/fs/artifact.py @@ -1,604 +1,610 @@ # Copyright (C) 2020 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information import asyncio from dataclasses import dataclass, field import json import logging import os from pathlib import Path import re from typing import Any, AsyncIterator, Dict, List from swh.fuse.fs.entry import ( EntryMode, FuseDirEntry, FuseEntry, FuseFileEntry, FuseSymlinkEntry, ) from swh.model.from_disk import DentryPerms from swh.model.identifiers import CONTENT, DIRECTORY, RELEASE, REVISION, SNAPSHOT, SWHID SWHID_REGEXP = r"swh:1:(cnt|dir|rel|rev|snp):[0-9a-f]{40}" @dataclass class Content(FuseFileEntry): """ Software Heritage content artifact. Attributes: swhid: Software Heritage persistent identifier prefetch: optional prefetched metadata used to set entry attributes Content leaves (AKA blobs) are represented on disks as regular files, containing the corresponding bytes, as archived. Note that permissions are associated to blobs only in the context of directories. Hence, when accessing blobs from the top-level `archive/` directory, the permissions of the `archive/SWHID` file will be arbitrary and not meaningful (e.g., `0x644`). """ swhid: SWHID prefetch: Any = None async def get_content(self) -> bytes: data = await self.fuse.get_blob(self.swhid) if not self.prefetch: self.prefetch = {"length": len(data)} return data async def size(self) -> int: if self.prefetch: return self.prefetch["length"] else: return await super().size() @dataclass class Directory(FuseDirEntry): """ Software Heritage directory artifact. Attributes: swhid: Software Heritage persistent identifier Directory nodes are represented as directories on the file-system, containing one entry for each entry of the archived directory. Entry names and other metadata, including permissions, will correspond to the archived entry metadata. Note that the FUSE mount is read-only, no matter what the permissions say. So it is possible that, in the context of a directory, a file is presented as writable, whereas actually writing to it will fail with `EPERM`. """ swhid: SWHID async def compute_entries(self) -> AsyncIterator[FuseEntry]: metadata = await self.fuse.get_metadata(self.swhid) for entry in metadata: name = entry["name"] swhid = entry["target"] mode = ( # Archived permissions for directories are always set to # 0o040000 so use a read-only permission instead int(EntryMode.RDONLY_DIR) if swhid.object_type == DIRECTORY else entry["perms"] ) # 1. Symlink (check symlink first because condition is less restrictive) if mode == DentryPerms.symlink: target = "" try: # Symlink target is stored in the blob content target = await self.fuse.get_blob(swhid) except Exception: pass # Ignore error and create a (broken) symlink anyway yield self.create_child( FuseSymlinkEntry, name=name, target=target, ) # 2. Regular file elif swhid.object_type == CONTENT: yield self.create_child( Content, name=name, mode=mode, swhid=swhid, # The directory API has extra info we can use to set # attributes without additional Software Heritage API call prefetch=entry, ) # 3. Regular directory elif swhid.object_type == DIRECTORY: yield self.create_child( Directory, name=name, mode=mode, swhid=swhid, ) # 4. Submodule elif swhid.object_type == REVISION: try: # Make sure the revision metadata is fetched and create a # symlink to distinguish it with regular directories await self.fuse.get_metadata(swhid) except Exception: pass # Ignore error and create a (broken) symlink anyway yield self.create_child( FuseSymlinkEntry, name=name, target=Path(self.get_relative_root_path(), f"archive/{swhid}"), ) else: raise ValueError("Unknown directory entry type: {swhid.object_type}") @dataclass class Revision(FuseDirEntry): """ Software Heritage revision artifact. Attributes: swhid: Software Heritage persistent identifier Revision (AKA commit) nodes are represented on the file-system as directories with the following entries: - `root`: source tree at the time of the commit, as a symlink pointing into `archive/`, to a SWHID of type `dir` - `parents/` (note the plural): a virtual directory containing entries named `1`, `2`, `3`, etc., one for each parent commit. Each of these entry is a symlink pointing into `archive/`, to the SWHID file for the given parent commit - `parent` (note the singular): present if and only if the current commit has at least one parent commit (which is the most common case). When present it is a symlink pointing into `parents/1/` - `history`: a virtual directory listing all its revision ancestors, sorted in reverse topological order. The history can be listed through `by-date/`, `by-hash/` or `by-page/` with each its own sharding policy. - `meta.json`: metadata for the current node, as a symlink pointing to the relevant `archive/.json` file """ swhid: SWHID async def compute_entries(self) -> AsyncIterator[FuseEntry]: metadata = await self.fuse.get_metadata(self.swhid) directory = metadata["directory"] parents = metadata["parents"] root_path = self.get_relative_root_path() yield self.create_child( FuseSymlinkEntry, name="root", target=Path(root_path, f"archive/{directory}"), ) yield self.create_child( FuseSymlinkEntry, name="meta.json", target=Path(root_path, f"archive/{self.swhid}.json"), ) yield self.create_child( RevisionParents, name="parents", mode=int(EntryMode.RDONLY_DIR), parents=[x["id"] for x in parents], ) if len(parents) >= 1: yield self.create_child( FuseSymlinkEntry, name="parent", target="parents/1/", ) yield self.create_child( RevisionHistory, name="history", mode=int(EntryMode.RDONLY_DIR), swhid=self.swhid, ) @dataclass class RevisionParents(FuseDirEntry): """ Revision virtual `parents/` directory """ parents: List[SWHID] async def compute_entries(self) -> AsyncIterator[FuseEntry]: root_path = self.get_relative_root_path() for i, parent in enumerate(self.parents): yield self.create_child( FuseSymlinkEntry, name=str(i + 1), target=Path(root_path, f"archive/{parent}"), ) @dataclass class RevisionHistory(FuseDirEntry): """ Revision virtual `history/` directory """ swhid: SWHID async def prefill_caches(self) -> None: history = await self.fuse.get_history(self.swhid) for swhid in history: await self.fuse.get_metadata(swhid) async def compute_entries(self) -> AsyncIterator[FuseEntry]: # Run it concurrently because of the many API calls necessary asyncio.create_task(self.prefill_caches()) yield self.create_child( RevisionHistoryShardByDate, name="by-date", mode=int(EntryMode.RDONLY_DIR), history_swhid=self.swhid, ) yield self.create_child( RevisionHistoryShardByHash, name="by-hash", mode=int(EntryMode.RDONLY_DIR), history_swhid=self.swhid, ) yield self.create_child( RevisionHistoryShardByPage, name="by-page", mode=int(EntryMode.RDONLY_DIR), history_swhid=self.swhid, ) @dataclass class RevisionHistoryShardByDate(FuseDirEntry): """ Revision virtual `history/by-date` sharded directory """ history_swhid: SWHID prefix: str = field(default="") is_status_done: bool = field(default=False) DATE_FMT = "{year:04d}/{month:02d}/{day:02d}/" ENTRIES_REGEXP = re.compile(r"^([0-9]{2,4})|(" + SWHID_REGEXP + ")$") @dataclass class StatusFile(FuseFileEntry): """ Temporary file used to indicate loading progress in by-date/ """ name: str = field(init=False, default=".status") mode: int = field(init=False, default=int(EntryMode.RDONLY_FILE)) - done: int - todo: int + history_swhid: SWHID + + def __post_init__(self): + super().__post_init__() + # This is the only case where we do not want the kernel to cache the file + self.file_info_attrs["keep_cache"] = False + self.file_info_attrs["direct_io"] = True async def get_content(self) -> bytes: - fmt = f"Done: {self.done}/{self.todo}\n" + history_full = await self.fuse.get_history(self.history_swhid) + history_cached = await self.fuse.cache.history.get_with_date_prefix( + self.history_swhid, date_prefix="" + ) + fmt = f"Done: {len(history_cached)}/{len(history_full)}\n" return fmt.encode() async def compute_entries(self) -> AsyncIterator[FuseEntry]: - history = await self.fuse.get_history(self.history_swhid) + history_full = await self.fuse.get_history(self.history_swhid) # Only check for cached revisions with the appropriate prefix, since # fetching all of them with the Web API would take too long - swhids = await self.fuse.cache.history.get_with_date_prefix( + history_cached = await self.fuse.cache.history.get_with_date_prefix( self.history_swhid, date_prefix=self.prefix ) depth = self.prefix.count("/") root_path = self.get_relative_root_path() sharded_dirs = set() - for (swhid, sharded_name) in swhids: + for (swhid, sharded_name) in history_cached: if not sharded_name.startswith(self.prefix): continue if depth == 3: yield self.create_child( FuseSymlinkEntry, name=str(swhid), target=Path(root_path, f"archive/{swhid}"), ) # Create sharded directories else: next_prefix = sharded_name.split("/")[depth] if next_prefix not in sharded_dirs: sharded_dirs.add(next_prefix) yield self.create_child( RevisionHistoryShardByDate, name=next_prefix, mode=int(EntryMode.RDONLY_DIR), prefix=f"{self.prefix}{next_prefix}/", history_swhid=self.history_swhid, ) - # TODO: store len(history) somewhere to avoid recompute? - self.is_status_done = len(swhids) == len(history) + self.is_status_done = len(history_cached) == len(history_full) if not self.is_status_done and depth == 0: yield self.create_child( - RevisionHistoryShardByDate.StatusFile, - done=len(swhids), - todo=len(history), + RevisionHistoryShardByDate.StatusFile, history_swhid=self.history_swhid ) @dataclass class RevisionHistoryShardByHash(FuseDirEntry): """ Revision virtual `history/by-hash` sharded directory """ history_swhid: SWHID prefix: str = field(default="") SHARDING_LENGTH = 2 ENTRIES_REGEXP = re.compile(r"^([a-f0-9]+)|(" + SWHID_REGEXP + ")$") async def compute_entries(self) -> AsyncIterator[FuseEntry]: history = await self.fuse.get_history(self.history_swhid) if self.prefix: root_path = self.get_relative_root_path() for swhid in history: if swhid.object_id.startswith(self.prefix): yield self.create_child( FuseSymlinkEntry, name=str(swhid), target=Path(root_path, f"archive/{swhid}"), ) # Create sharded directories else: sharded_dirs = set() for swhid in history: next_prefix = swhid.object_id[: self.SHARDING_LENGTH] if next_prefix not in sharded_dirs: sharded_dirs.add(next_prefix) yield self.create_child( RevisionHistoryShardByHash, name=next_prefix, mode=int(EntryMode.RDONLY_DIR), prefix=next_prefix, history_swhid=self.history_swhid, ) @dataclass class RevisionHistoryShardByPage(FuseDirEntry): """ Revision virtual `history/by-page` sharded directory """ history_swhid: SWHID prefix: int = field(default=None) PAGE_SIZE = 10_000 PAGE_FMT = "{page_number:03d}" ENTRIES_REGEXP = re.compile(r"^([0-9]+)|(" + SWHID_REGEXP + ")$") async def compute_entries(self) -> AsyncIterator[FuseEntry]: history = await self.fuse.get_history(self.history_swhid) if self.prefix is not None: current_page = self.prefix root_path = self.get_relative_root_path() max_idx = min(len(history), (current_page + 1) * self.PAGE_SIZE) for i in range(current_page * self.PAGE_SIZE, max_idx): swhid = history[i] yield self.create_child( FuseSymlinkEntry, name=str(swhid), target=Path(root_path, f"archive/{swhid}"), ) # Create sharded directories else: for i in range(0, len(history), self.PAGE_SIZE): page_number = i // self.PAGE_SIZE yield self.create_child( RevisionHistoryShardByPage, name=self.PAGE_FMT.format(page_number=page_number), mode=int(EntryMode.RDONLY_DIR), history_swhid=self.history_swhid, prefix=page_number, ) @dataclass class Release(FuseDirEntry): """ Software Heritage release artifact. Attributes: swhid: Software Heritage persistent identifier Release nodes are represented on the file-system as directories with the following entries: - `target`: target node, as a symlink to `archive/` - `target_type`: regular file containing the type of the target SWHID - `root`: present if and only if the release points to something that (transitively) resolves to a directory. When present it is a symlink pointing into `archive/` to the SWHID of the given directory - `meta.json`: metadata for the current node, as a symlink pointing to the relevant `archive/.json` file """ swhid: SWHID async def find_root_directory(self, swhid: SWHID) -> SWHID: if swhid.object_type == RELEASE: metadata = await self.fuse.get_metadata(swhid) return await self.find_root_directory(metadata["target"]) elif swhid.object_type == REVISION: metadata = await self.fuse.get_metadata(swhid) return metadata["directory"] elif swhid.object_type == DIRECTORY: return swhid else: return None async def compute_entries(self) -> AsyncIterator[FuseEntry]: metadata = await self.fuse.get_metadata(self.swhid) root_path = self.get_relative_root_path() yield self.create_child( FuseSymlinkEntry, name="meta.json", target=Path(root_path, f"archive/{self.swhid}.json"), ) target = metadata["target"] yield self.create_child( FuseSymlinkEntry, name="target", target=Path(root_path, f"archive/{target}") ) yield self.create_child( ReleaseType, name="target_type", mode=int(EntryMode.RDONLY_FILE), target_type=target.object_type, ) target_dir = await self.find_root_directory(target) if target_dir is not None: yield self.create_child( FuseSymlinkEntry, name="root", target=Path(root_path, f"archive/{target_dir}"), ) @dataclass class ReleaseType(FuseFileEntry): """ Release type virtual file """ target_type: str async def get_content(self) -> bytes: return str.encode(self.target_type + "\n") @dataclass class Snapshot(FuseDirEntry): """ Software Heritage snapshot artifact. Attributes: swhid: Software Heritage persistent identifier Snapshot nodes are represented on the file-system as recursive directories following the branch names structure. For example, a branch named ``refs/tags/v1.0`` will be represented as a ``refs`` directory containing a ``tags`` directory containing a ``v1.0`` symlink pointing to the branch target SWHID. """ swhid: SWHID prefix: str = field(default="") async def compute_entries(self) -> AsyncIterator[FuseEntry]: metadata = await self.fuse.get_metadata(self.swhid) root_path = self.get_relative_root_path() subdirs = set() for branch_name, branch_meta in metadata.items(): if not branch_name.startswith(self.prefix): continue next_subdirs = branch_name[len(self.prefix) :].split("/") next_prefix = next_subdirs[0] if len(next_subdirs) == 1: # Non-alias targets are symlinks to their corresponding archived # artifact, whereas alias targets are relative symlinks to the # corresponding snapshot directory entry. target_type = branch_meta["target_type"] target_raw = branch_meta["target"] if target_type == "alias": prefix = Path(branch_name).parent target = os.path.relpath(target_raw, prefix) else: target = f"{root_path}/archive/{target_raw}" yield self.create_child( FuseSymlinkEntry, name=next_prefix, target=Path(target), ) else: subdirs.add(next_prefix) for subdir in subdirs: yield self.create_child( Snapshot, name=subdir, mode=int(EntryMode.RDONLY_DIR), swhid=self.swhid, prefix=f"{self.prefix}{subdir}/", ) @dataclass class Origin(FuseDirEntry): """ Software Heritage origin artifact. Origin nodes are represented on the file-system as directories with one entry for each origin visit. The visits directories are named after the visit date (`YYYY-MM-DD`, if multiple visits occur the same day only the first one is kept). Each visit directory contains a `meta.json` with associated metadata for the origin node, and potentially a `snapshot` symlink pointing to the visit's snapshot node. """ DATE_FMT = "{year:04d}-{month:02d}-{day:02d}" ENTRIES_REGEXP = re.compile(r"^[0-9]{4}-[0-9]{2}-[0-9]{2}$") async def compute_entries(self) -> AsyncIterator[FuseEntry]: # The origin's name is always its URL (encoded to create a valid UNIX filename) visits = await self.fuse.get_visits(self.name) seen_date = set() for visit in visits: date = visit["date"] name = self.DATE_FMT.format(year=date.year, month=date.month, day=date.day) if name in seen_date: logging.debug( "Conflict date on origin: %s, %s", visit["origin"], str(name) ) else: seen_date.add(name) yield self.create_child( OriginVisit, name=name, mode=int(EntryMode.RDONLY_DIR), meta=visit, ) @dataclass class OriginVisit(FuseDirEntry): """ Origin visit virtual directory """ meta: Dict[str, Any] @dataclass class MetaFile(FuseFileEntry): content: str async def get_content(self) -> bytes: return str.encode(self.content + "\n") async def compute_entries(self) -> AsyncIterator[FuseEntry]: snapshot_swhid = self.meta["snapshot"] if snapshot_swhid: root_path = self.get_relative_root_path() yield self.create_child( FuseSymlinkEntry, name="snapshot", target=Path(root_path, f"archive/{snapshot_swhid}"), ) yield self.create_child( OriginVisit.MetaFile, name="meta.json", mode=int(EntryMode.RDONLY_FILE), content=json.dumps( self.meta, indent=self.fuse.conf["json-indent"], default=lambda x: str(x), ), ) OBJTYPE_GETTERS = { CONTENT: Content, DIRECTORY: Directory, REVISION: Revision, RELEASE: Release, SNAPSHOT: Snapshot, } diff --git a/swh/fuse/fs/entry.py b/swh/fuse/fs/entry.py index cada9bb..8777d73 100644 --- a/swh/fuse/fs/entry.py +++ b/swh/fuse/fs/entry.py @@ -1,141 +1,144 @@ # Copyright (C) 2020 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information from __future__ import annotations from dataclasses import dataclass, field from enum import IntEnum from pathlib import Path import re from stat import S_IFDIR, S_IFLNK, S_IFREG -from typing import Any, AsyncIterator, Optional, Pattern, Sequence, Union +from typing import Any, AsyncIterator, Dict, Optional, Pattern, Sequence, Union # Avoid cycling import Fuse = "Fuse" class EntryMode(IntEnum): """ Default entry mode and permissions for the FUSE. The FUSE mount is always read-only, even if permissions contradict this statement (in a context of a directory, entries are listed with permissions taken from the archive). """ RDONLY_FILE = S_IFREG | 0o444 RDONLY_DIR = S_IFDIR | 0o555 SYMLINK = S_IFLNK | 0o444 @dataclass class FuseEntry: """ Main wrapper class to manipulate virtual FUSE entries Attributes: name: entry filename mode: entry permission mode fuse: internal reference to the main FUSE class inode: unique integer identifying the entry """ name: str mode: int depth: int fuse: Fuse inode: int = field(init=False) + file_info_attrs: Dict[str, Any] = field(init=False, default_factory=dict) def __post_init__(self): self.inode = self.fuse._alloc_inode(self) + # By default, let the kernel cache previously accessed data + self.file_info_attrs["keep_cache"] = True async def size(self) -> int: """ Return the size (in bytes) of an entry """ raise NotImplementedError def get_relative_root_path(self) -> str: return "../" * (self.depth - 1) def create_child(self, constructor: Any, **kwargs) -> FuseEntry: return constructor(depth=self.depth + 1, fuse=self.fuse, **kwargs) @dataclass class FuseFileEntry(FuseEntry): """ FUSE virtual file entry """ async def get_content(self) -> bytes: """ Return the content of a file entry """ raise NotImplementedError async def size(self) -> int: return len(await self.get_content()) @dataclass class FuseDirEntry(FuseEntry): """ FUSE virtual directory entry """ ENTRIES_REGEXP: Optional[Pattern] = field(init=False, default=None) async def size(self) -> int: return 0 def validate_entry(self, name: str) -> bool: """ Return true if the name matches the directory entries regular expression, and false otherwise """ if self.ENTRIES_REGEXP: return re.match(self.ENTRIES_REGEXP, name) else: return True async def compute_entries(self) -> Sequence[FuseEntry]: """ Return the child entries of a directory entry """ raise NotImplementedError async def get_entries(self, offset: int = 0) -> AsyncIterator[FuseEntry]: """ Return the child entries of a directory entry using direntry cache """ cache = self.fuse.cache.direntry.get(self) if cache: entries = cache else: entries = [x async for x in self.compute_entries()] self.fuse.cache.direntry.set(self, entries) # Avoid copy by manual iteration (instead of slicing) and use of a # generator (instead of returning the full list every time) for i in range(offset, len(entries)): yield entries[i] async def lookup(self, name: str) -> FuseEntry: """ Look up a FUSE entry by name """ async for entry in self.get_entries(): if entry.name == name: return entry return None @dataclass class FuseSymlinkEntry(FuseEntry): """ FUSE virtual symlink entry Attributes: target: path to symlink target """ mode: int = field(init=False, default=int(EntryMode.SYMLINK)) target: Union[str, bytes, Path] async def size(self) -> int: return len(str(self.target)) def get_target(self) -> Union[str, bytes, Path]: """ Return the path target of a symlink entry """ return self.target diff --git a/swh/fuse/fuse.py b/swh/fuse/fuse.py index 00d1a5b..0579fdc 100644 --- a/swh/fuse/fuse.py +++ b/swh/fuse/fuse.py @@ -1,332 +1,333 @@ # Copyright (C) 2020 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information import asyncio import errno import functools import logging import os from pathlib import Path import time from typing import Any, Dict, List import urllib.parse import pyfuse3 import pyfuse3_asyncio import requests from swh.fuse import LOGGER_NAME from swh.fuse.cache import FuseCache from swh.fuse.fs.entry import FuseDirEntry, FuseEntry, FuseFileEntry, FuseSymlinkEntry from swh.fuse.fs.mountpoint import Root from swh.model.identifiers import CONTENT, REVISION, SWHID from swh.web.client.client import WebAPIClient class Fuse(pyfuse3.Operations): """ Software Heritage Filesystem in Userspace (FUSE). Locally mount parts of the archive and navigate it as a virtual file system. """ def __init__( self, root_path: Path, cache: FuseCache, conf: Dict[str, Any], ): super(Fuse, self).__init__() self._next_inode: int = pyfuse3.ROOT_INODE self._inode2entry: Dict[int, FuseEntry] = {} self.root = Root(fuse=self) self.conf = conf self.logger = logging.getLogger(LOGGER_NAME) self.time_ns: int = time.time_ns() # start time, used as timestamp self.gid = os.getgid() self.uid = os.getuid() self.web_api = WebAPIClient( conf["web-api"]["url"], conf["web-api"]["auth-token"] ) self.cache = cache def shutdown(self) -> None: pass def _alloc_inode(self, entry: FuseEntry) -> int: """ Return a unique inode integer for a given entry """ inode = self._next_inode self._next_inode += 1 self._inode2entry[inode] = entry # TODO add inode recycling with invocation to invalidate_inode when # the dicts get too big return inode def inode2entry(self, inode: int) -> FuseEntry: """ Return the entry matching a given inode """ try: return self._inode2entry[inode] except KeyError: raise pyfuse3.FUSEError(errno.ENOENT) async def get_metadata(self, swhid: SWHID) -> Any: """ Retrieve metadata for a given SWHID using Software Heritage API """ cache = await self.cache.metadata.get(swhid) if cache: return cache try: typify = False # Get the raw JSON from the API # TODO: async web API loop = asyncio.get_event_loop() metadata = await loop.run_in_executor(None, self.web_api.get, swhid, typify) await self.cache.metadata.set(swhid, metadata) # Retrieve it from cache so it is correctly typed return await self.cache.metadata.get(swhid) except requests.HTTPError as err: self.logger.error("Cannot fetch metadata for object %s: %s", swhid, err) raise async def get_blob(self, swhid: SWHID) -> bytes: """ Retrieve the blob bytes for a given content SWHID using Software Heritage API """ if swhid.object_type != CONTENT: raise pyfuse3.FUSEError(errno.EINVAL) # Make sure the metadata cache is also populated with the given SWHID await self.get_metadata(swhid) cache = await self.cache.blob.get(swhid) if cache: self.logger.debug("Found blob %s in cache", swhid) return cache try: self.logger.debug("Retrieving blob %s via web API...", swhid) loop = asyncio.get_event_loop() resp = await loop.run_in_executor(None, self.web_api.content_raw, swhid) blob = b"".join(list(resp)) await self.cache.blob.set(swhid, blob) return blob except requests.HTTPError as err: self.logger.error("Cannot fetch blob for object %s: %s", swhid, err) raise async def get_history(self, swhid: SWHID) -> List[SWHID]: """ Retrieve a revision's history using Software Heritage Graph API """ if swhid.object_type != REVISION: raise pyfuse3.FUSEError(errno.EINVAL) cache = await self.cache.history.get(swhid) if cache: self.logger.debug( "Found history of %s in cache (%d ancestors)", swhid, len(cache) ) return cache try: # Use the swh-graph API to retrieve the full history very fast self.logger.debug("Retrieving history of %s via graph API...", swhid) call = f"graph/visit/edges/{swhid}?edges=rev:rev" loop = asyncio.get_event_loop() history = await loop.run_in_executor(None, self.web_api._call, call) await self.cache.history.set(history.text) # Retrieve it from cache so it is correctly typed res = await self.cache.history.get(swhid) return res except requests.HTTPError as err: self.logger.error("Cannot fetch history for object %s: %s", swhid, err) # Ignore exception since swh-graph does not necessarily contain the # most recent artifacts from the archive. Computing the full history # from the Web API is too computationally intensive so simply return # an empty list. return [] async def get_visits(self, url_encoded: str) -> List[Dict[str, Any]]: """ Retrieve origin visits given an encoded-URL using Software Heritage API """ cache = await self.cache.metadata.get_visits(url_encoded) if cache: self.logger.debug( "Found %d visits for origin '%s' in cache", len(cache), url_encoded, ) return cache try: self.logger.debug( "Retrieving visits for origin '%s' via web API...", url_encoded ) typify = False # Get the raw JSON from the API loop = asyncio.get_event_loop() # Web API only takes non-encoded URL url = urllib.parse.unquote_plus(url_encoded) origin_exists = await loop.run_in_executor( None, self.web_api.origin_exists, url ) if not origin_exists: raise ValueError("origin does not exist") visits_it = await loop.run_in_executor( None, functools.partial(self.web_api.visits, url, typify=typify) ) visits = list(visits_it) await self.cache.metadata.set_visits(url_encoded, visits) # Retrieve it from cache so it is correctly typed res = await self.cache.metadata.get_visits(url_encoded) return res except (ValueError, requests.HTTPError) as err: self.logger.error( "Cannot fetch visits for origin '%s': %s", url_encoded, err ) raise async def get_attrs(self, entry: FuseEntry) -> pyfuse3.EntryAttributes: """ Return entry attributes """ attrs = pyfuse3.EntryAttributes() attrs.st_size = 0 attrs.st_atime_ns = self.time_ns attrs.st_ctime_ns = self.time_ns attrs.st_mtime_ns = self.time_ns attrs.st_gid = self.gid attrs.st_uid = self.uid attrs.st_ino = entry.inode attrs.st_mode = entry.mode attrs.st_size = await entry.size() return attrs async def getattr( self, inode: int, _ctx: pyfuse3.RequestContext ) -> pyfuse3.EntryAttributes: """ Get attributes for a given inode """ entry = self.inode2entry(inode) return await self.get_attrs(entry) async def opendir(self, inode: int, _ctx: pyfuse3.RequestContext) -> int: """ Open a directory referred by a given inode """ # Re-use inode as directory handle self.logger.debug("opendir(inode=%d)", inode) return inode async def readdir(self, fh: int, offset: int, token: pyfuse3.ReaddirToken) -> None: """ Read entries in an open directory """ # opendir() uses inode as directory handle inode = fh direntry = self.inode2entry(inode) self.logger.debug( "readdir(dirname=%s, fh=%d, offset=%d)", direntry.name, fh, offset ) assert isinstance(direntry, FuseDirEntry) next_id = offset + 1 try: async for entry in direntry.get_entries(offset): name = os.fsencode(entry.name) attrs = await self.get_attrs(entry) if not pyfuse3.readdir_reply(token, name, attrs, next_id): break next_id += 1 self._inode2entry[attrs.st_ino] = entry except Exception as err: self.logger.exception("Cannot readdir: %s", err) raise pyfuse3.FUSEError(errno.ENOENT) async def open( self, inode: int, _flags: int, _ctx: pyfuse3.RequestContext ) -> pyfuse3.FileInfo: """ Open an inode and return a unique file handle """ # Re-use inode as file handle self.logger.debug("open(inode=%d)", inode) - return pyfuse3.FileInfo(fh=inode, keep_cache=True) + entry = self.inode2entry(inode) + return pyfuse3.FileInfo(fh=inode, **entry.file_info_attrs) async def read(self, fh: int, offset: int, length: int) -> bytes: """ Read `length` bytes from file handle `fh` at position `offset` """ # open() uses inode as file handle inode = fh entry = self.inode2entry(inode) self.logger.debug( "read(name=%s, fh=%d, offset=%d, length=%d)", entry.name, fh, offset, length ) assert isinstance(entry, FuseFileEntry) try: data = await entry.get_content() return data[offset : offset + length] except Exception as err: self.logger.exception("Cannot read: %s", err) raise pyfuse3.FUSEError(errno.ENOENT) async def lookup( self, parent_inode: int, name: str, _ctx: pyfuse3.RequestContext ) -> pyfuse3.EntryAttributes: """ Look up a directory entry by name and get its attributes """ name = os.fsdecode(name) parent_entry = self.inode2entry(parent_inode) self.logger.debug( "lookup(parent_name=%s, parent_inode=%d, name=%s)", parent_entry.name, parent_inode, name, ) assert isinstance(parent_entry, FuseDirEntry) try: if parent_entry.validate_entry(name): lookup_entry = await parent_entry.lookup(name) if lookup_entry: return await self.get_attrs(lookup_entry) except Exception as err: self.logger.exception("Cannot lookup: %s", err) raise pyfuse3.FUSEError(errno.ENOENT) async def readlink(self, inode: int, _ctx: pyfuse3.RequestContext) -> bytes: entry = self.inode2entry(inode) self.logger.debug("readlink(name=%s, inode=%d)", entry.name, inode) assert isinstance(entry, FuseSymlinkEntry) return os.fsencode(entry.get_target()) async def main(swhids: List[SWHID], root_path: Path, conf: Dict[str, Any]) -> None: """ swh-fuse CLI entry-point """ # Use pyfuse3 asyncio layer to match the rest of Software Heritage codebase pyfuse3_asyncio.enable() async with FuseCache(conf["cache"]) as cache: fs = Fuse(root_path, cache, conf) # Initially populate the cache for swhid in swhids: try: await fs.get_metadata(swhid) except Exception as err: fs.logger.exception("Cannot prefetch object %s: %s", swhid, err) fuse_options = set(pyfuse3.default_options) fuse_options.add("fsname=swhfs") try: pyfuse3.init(fs, root_path, fuse_options) await pyfuse3.main() except Exception as err: fs.logger.error("Error running FUSE: %s", err) finally: fs.shutdown() pyfuse3.close(unmount=True)