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

use super::{DispatchResult, MailDispatch, MailSetup};
use crate::common::*;

#[derive(Debug)]
pub struct NullDispatch;

impl MailDispatch for NullDispatch {
    fn send_mail<'a, 's, 'f>(
        &'a self,
        _session: &'s super::SessionInfo,
        mut transaction: super::Transaction,
    ) -> crate::common::S2Fut<'f, DispatchResult>
    where
        'a: 'f,
        's: 'f,
    {
        if transaction.sink.is_none() {
            transaction.sink = Some(Box::pin(NullSink))
        }
        Box::pin(ready(Ok(transaction)))
    }
}
impl MailSetup for NullDispatch {
    fn setup(self, builder: &mut super::Builder) {
        builder.dispatch.insert(0, Box::new(self))
    }
}

struct NullSink;

impl Write for NullSink {
    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
        Poll::Ready(Ok(()))
    }
    fn poll_close(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
        Poll::Ready(Ok(()))
    }
    fn poll_write(
        self: Pin<&mut Self>,
        _cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<std::io::Result<usize>> {
        Poll::Ready(Ok(buf.len()))
    }
}