opendal/services/compfs/
writer.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::io::Cursor;
19use std::sync::Arc;
20
21use compio::buf::buf_try;
22use compio::fs::File;
23use compio::io::AsyncWriteExt;
24
25use super::core::CompfsCore;
26use crate::raw::*;
27use crate::*;
28
29#[derive(Debug)]
30pub struct CompfsWriter {
31    core: Arc<CompfsCore>,
32    file: Option<Cursor<File>>,
33}
34
35impl CompfsWriter {
36    pub(super) fn new(core: Arc<CompfsCore>, file: Cursor<File>) -> Self {
37        Self {
38            core,
39            file: Some(file),
40        }
41    }
42}
43
44impl oio::Write for CompfsWriter {
45    /// FIXME
46    ///
47    /// the write_all doesn't work correctly if `bs` is non-contiguous.
48    ///
49    /// The IoBuf::buf_len() only returns the length of the current buffer.
50    async fn write(&mut self, bs: Buffer) -> Result<()> {
51        let Some(mut file) = self.file.clone() else {
52            return Err(Error::new(ErrorKind::Unexpected, "file has closed"));
53        };
54
55        let pos = self
56            .core
57            .exec(move || async move {
58                for b in bs {
59                    buf_try!(@try file.write_all(b).await);
60                }
61                Ok(file.position())
62            })
63            .await?;
64        self.file.as_mut().unwrap().set_position(pos);
65
66        Ok(())
67    }
68
69    async fn close(&mut self) -> Result<Metadata> {
70        let Some(f) = self.file.take() else {
71            return Err(Error::new(ErrorKind::Unexpected, "file has closed"));
72        };
73
74        self.core
75            .exec(move || async move {
76                f.get_ref().sync_all().await?;
77                f.into_inner().close().await
78            })
79            .await?;
80
81        Ok(Metadata::default())
82    }
83
84    async fn abort(&mut self) -> Result<()> {
85        Err(Error::new(
86            ErrorKind::Unsupported,
87            "cannot abort completion-based operations",
88        ))
89    }
90}
opendal/services/compfs/writer.rs

opendal/services/compfs/
writer.rs
