diqiu50 commented on code in PR #5738: URL: https://github.com/apache/gravitino/pull/5738#discussion_r1878051123
########## clients/filesystem-fuse/src/fuse_api_handle.rs: ########## @@ -0,0 +1,437 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +use crate::filesystem::{FileStat, FileSystemContext, RawFileSystem, SimpleFileSystem}; +use fuse3::path::prelude::{ReplyData, ReplyOpen, ReplyStatFs, ReplyWrite}; +use fuse3::path::Request; +use fuse3::raw::prelude::{ + FileAttr, ReplyAttr, ReplyCreated, ReplyDirectory, ReplyDirectoryPlus, ReplyEntry, ReplyInit, +}; +use fuse3::raw::reply::{DirectoryEntry, DirectoryEntryPlus}; +use fuse3::raw::Filesystem; +use fuse3::FileType::{Directory, RegularFile}; +use fuse3::{Errno, FileType, Inode, SetAttr, Timestamp}; +use futures_util::stream::BoxStream; +use futures_util::StreamExt; +use futures_util::{stream, FutureExt}; +use std::ffi::{OsStr, OsString}; +use std::num::NonZeroU32; +use std::time::{Duration, SystemTime}; + +pub(crate) struct FuseApiHandle<T: RawFileSystem> { + local_fs: T, + default_ttl: Duration, + fs_context: FileSystemContext, +} + +impl<T: RawFileSystem> FuseApiHandle<T> { + pub fn new(fs: T, context: FileSystemContext) -> Self { + FuseApiHandle { + local_fs: fs, + default_ttl: Duration::from_secs(1), + fs_context: context, + } + } + + pub async fn get_file_path(&self, inode: u64) -> String { + self.local_fs.get_file_path(inode).await + } + + async fn get_modified_file_stat( + &self, + inode: u64, + size: Option<u64>, + atime: Option<Timestamp>, + mtime: Option<Timestamp>, + ) -> Result<FileStat, Errno> { + let file_stat = self.local_fs.stat(inode).await?; + let mut nf = FileStat::clone(&file_stat); + size.map(|size| { + nf.size = size; + }); + atime.map(|atime| { + nf.atime = atime; + }); + mtime.map(|mtime| { + nf.mtime = mtime; + }); + Ok(nf) + } +} + +impl<T: RawFileSystem> Filesystem for FuseApiHandle<T> { + async fn init(&self, _req: Request) -> fuse3::Result<ReplyInit> { + self.local_fs.init().await; + Ok(ReplyInit { + max_write: NonZeroU32::new(16 * 1024).unwrap(), + }) + } + + async fn destroy(&self, _req: Request) {} + + async fn lookup( + &self, + _req: Request, + parent: Inode, + name: &OsStr, + ) -> fuse3::Result<ReplyEntry> { + let file_stat = self.local_fs.lookup(parent, name.to_str().unwrap()).await?; + Ok(ReplyEntry { + ttl: self.default_ttl, + attr: fstat_to_file_attr(&file_stat, &self.fs_context), + generation: 0, + }) + } + + async fn getattr( + &self, + _req: Request, + inode: Inode, + fh: Option<u64>, + _flags: u32, + ) -> fuse3::Result<ReplyAttr> { + // check the opened file inode is the same as the inode + if let Some(fh) = fh { + self.local_fs.valid_file_id(inode, fh).await?; + } + + let file_stat = self.local_fs.stat(inode).await?; + Ok(ReplyAttr { + ttl: self.default_ttl, + attr: fstat_to_file_attr(&file_stat, &self.fs_context), + }) + } + + async fn setattr( + &self, + req: Request, + inode: Inode, + fh: Option<u64>, + set_attr: SetAttr, + ) -> fuse3::Result<ReplyAttr> { + let new_file_stat = self + .get_modified_file_stat(inode, set_attr.size, set_attr.atime, set_attr.mtime) + .await?; + let attr = fstat_to_file_attr(&new_file_stat, &self.fs_context); + self.local_fs.set_attr(inode, &new_file_stat).await?; + Ok(ReplyAttr { + ttl: self.default_ttl, + attr: attr, + }) + } + + async fn mkdir( + &self, + req: Request, + parent: Inode, + name: &OsStr, + mode: u32, + umask: u32, + ) -> fuse3::Result<ReplyEntry> { + let handle_id = self + .local_fs + .create_dir(parent, name.to_str().unwrap()) + .await?; + Ok(ReplyEntry { + ttl: self.default_ttl, + attr: dummy_file_attr( + handle_id.file_id, + Directory, + Timestamp::from(SystemTime::now()), + &self.fs_context, + ), + generation: 0, + }) + } + + async fn unlink(&self, req: Request, parent: Inode, name: &OsStr) -> fuse3::Result<()> { + let result = self + .local_fs + .remove_file(parent, name.to_str().unwrap()) + .await?; + Ok(()) + } + + async fn rmdir(&self, req: Request, parent: Inode, name: &OsStr) -> fuse3::Result<()> { + self.local_fs + .remove_dir(parent, name.to_str().unwrap()) + .await?; + Ok(()) + } + + async fn open(&self, req: Request, inode: Inode, flags: u32) -> fuse3::Result<ReplyOpen> { + let file_handle = self.local_fs.open_file(inode, flags).await?; + Ok(ReplyOpen { + fh: file_handle.handle_id, + flags: flags, + }) + } + + async fn read( + &self, + req: Request, + inode: Inode, + fh: u64, + offset: u64, + size: u32, + ) -> fuse3::Result<ReplyData> { + let data = self.local_fs.read(inode, fh, offset, size).await?; + Ok(ReplyData { data: data }) + } + + async fn write( + &self, + req: Request, + inode: Inode, + fh: u64, + offset: u64, + data: &[u8], + write_flags: u32, + flags: u32, + ) -> fuse3::Result<ReplyWrite> { + let mut written = self.local_fs.write(inode, fh, offset, data).await?; + Ok(ReplyWrite { written: written }) + } + + async fn statfs(&self, req: Request, inode: Inode) -> fuse3::Result<ReplyStatFs> { + Ok(ReplyStatFs { + blocks: 1000000, + bfree: 1000000, + bavail: 1000000, + files: 1000000, + ffree: 1000000, + bsize: 4096, + namelen: 255, + frsize: 4096, + }) + } + + async fn release( + &self, + req: Request, + inode: Inode, + fh: u64, + flags: u32, + lock_owner: u64, + flush: bool, + ) -> fuse3::Result<()> { + self.local_fs.close_file(inode, fh).await + } + + async fn opendir(&self, req: Request, inode: Inode, flags: u32) -> fuse3::Result<ReplyOpen> { + let file_handle = self.local_fs.open_dir(inode, flags).await?; + Ok(ReplyOpen { + fh: file_handle.handle_id, + flags: flags, + }) + } + + type DirEntryStream<'a> + = BoxStream<'a, fuse3::Result<DirectoryEntry>> + where + T: 'a; + + async fn readdir<'a>( + &'a self, + req: Request, + parent: Inode, + fh: u64, + offset: i64, + ) -> fuse3::Result<ReplyDirectory<Self::DirEntryStream<'a>>> { + let current = self.local_fs.stat(parent).await?; + let files = self.local_fs.read_dir(parent).await?; + let entries_stream = + stream::iter(files.into_iter().enumerate().map(|(index, file_stat)| { + Ok(DirectoryEntry { + inode: file_stat.inode, + name: file_stat.name.clone().into(), + kind: file_stat.kind, + offset: (index + 3) as i64, + }) + })); + + let mut relative_paths = stream::iter([ + Ok(DirectoryEntry { + inode: current.inode, + name: ".".into(), + kind: Directory, + offset: 1, + }), + Ok(DirectoryEntry { + inode: current.parent_inode, + name: "..".into(), + kind: Directory, + offset: 2, + }), + ]); + + let combined_stream = relative_paths.chain(entries_stream); + Ok(ReplyDirectory { + entries: combined_stream.skip(offset as usize).boxed(), + }) + } + + async fn releasedir( + &self, + req: Request, + inode: Inode, + fh: u64, + flags: u32, + ) -> fuse3::Result<()> { + self.local_fs.close_file(inode, fh).await + } + + async fn create( + &self, + req: Request, + parent: Inode, + name: &OsStr, + mode: u32, + flags: u32, + ) -> fuse3::Result<ReplyCreated> { + let file_handle = self + .local_fs + .create_file(parent, name.to_str().unwrap(), flags) + .await?; + Ok(ReplyCreated { + ttl: self.default_ttl, + attr: dummy_file_attr( + file_handle.file_id, + RegularFile, + Timestamp::from(SystemTime::now()), + &self.fs_context, + ), + generation: 0, + fh: file_handle.handle_id, + flags: flags, + }) + } + + type DirEntryPlusStream<'a> + = BoxStream<'a, fuse3::Result<DirectoryEntryPlus>> + where + T: 'a; + + async fn readdirplus<'a>( Review Comment: `readdirplus` is a new api of fuse. it has better performance -- This is an automated message from the Apache Git Service. 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