1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

//! Used for sharing references to the same file across multiple file systems,
//! effectively this is a symbolic link without all the complex path redirection

use crate::{ClonableVirtualFile, VirtualFile};
use derivative::Derivative;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::{
    io::{self, *},
    sync::{Arc, Mutex},
};
use tokio::io::{AsyncRead, AsyncSeek, AsyncWrite};

#[derive(Derivative, Clone)]
#[derivative(Debug)]
pub struct ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    #[derivative(Debug = "ignore")]
    inner: Arc<Mutex<Box<T>>>,
}

impl<T> ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    pub fn new(inner: Box<T>) -> Self {
        Self {
            inner: Arc::new(Mutex::new(inner)),
        }
    }
}

impl<T> AsyncSeek for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    fn start_seek(self: Pin<&mut Self>, position: SeekFrom) -> io::Result<()> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.start_seek(position)
    }
    fn poll_complete(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<u64>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_complete(cx)
    }
}

impl<T> AsyncWrite for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_write(cx, buf)
    }
    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_flush(cx)
    }
    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_shutdown(cx)
    }
    fn poll_write_vectored(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &[IoSlice<'_>],
    ) -> Poll<io::Result<usize>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_write_vectored(cx, bufs)
    }
    fn is_write_vectored(&self) -> bool {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.is_write_vectored()
    }
}

impl<T> AsyncRead for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut tokio::io::ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        let mut guard = self.inner.lock().unwrap();
        let file = Pin::new(guard.as_mut());
        file.poll_read(cx, buf)
    }
}

impl<T> VirtualFile for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
{
    fn last_accessed(&self) -> u64 {
        let inner = self.inner.lock().unwrap();
        inner.last_accessed()
    }
    fn last_modified(&self) -> u64 {
        let inner = self.inner.lock().unwrap();
        inner.last_modified()
    }
    fn created_time(&self) -> u64 {
        let inner = self.inner.lock().unwrap();
        inner.created_time()
    }
    fn size(&self) -> u64 {
        let inner = self.inner.lock().unwrap();
        inner.size()
    }
    fn set_len(&mut self, new_size: u64) -> crate::Result<()> {
        let mut inner = self.inner.lock().unwrap();
        inner.set_len(new_size)
    }
    fn unlink(&mut self) -> crate::Result<()> {
        let mut inner = self.inner.lock().unwrap();
        inner.unlink()
    }
    fn is_open(&self) -> bool {
        let inner = self.inner.lock().unwrap();
        inner.is_open()
    }
    fn get_special_fd(&self) -> Option<u32> {
        let inner = self.inner.lock().unwrap();
        inner.get_special_fd()
    }
    fn poll_read_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<usize>> {
        let mut inner = self.inner.lock().unwrap();
        let inner = Pin::new(inner.as_mut());
        inner.poll_read_ready(cx)
    }
    fn poll_write_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<usize>> {
        let mut inner = self.inner.lock().unwrap();
        let inner = Pin::new(inner.as_mut());
        inner.poll_write_ready(cx)
    }
}

impl<T> ClonableVirtualFile for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
    T: Clone,
{
}

impl<T> Default for ArcFile<T>
where
    T: VirtualFile + Send + Sync + 'static,
    T: Default,
{
    fn default() -> Self {
        Self {
            inner: Arc::new(Mutex::new(Box::new(Default::default()))),
        }
    }
}