-
Notifications
You must be signed in to change notification settings - Fork 965
/
boxed.rs
139 lines (123 loc) · 5 KB
/
boxed.rs
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
// Copyright 2018 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
use crate::transport::{ListenerEvent, Transport, TransportError};
use futures::prelude::*;
use multiaddr::Multiaddr;
use std::{error::Error, fmt, io, pin::Pin};
/// Creates a new [`Boxed`] transport from the given transport.
pub fn boxed<T>(transport: T) -> Boxed<T::Output>
where
T: Transport + Send + 'static,
T::Error: Send + Sync,
T::Dial: Send + 'static,
T::Listener: Send + 'static,
T::ListenerUpgrade: Send + 'static,
{
Boxed {
inner: Box::new(transport) as Box<_>,
}
}
/// A `Boxed` transport is a `Transport` whose `Dial`, `Listener`
/// and `ListenerUpgrade` futures are `Box`ed and only the `Output`
/// and `Error` types are captured in type variables.
pub struct Boxed<O> {
inner: Box<dyn Abstract<O> + Send>,
}
type Dial<O> = Pin<Box<dyn Future<Output = io::Result<O>> + Send>>;
type Listener<O> =
Pin<Box<dyn Stream<Item = io::Result<ListenerEvent<ListenerUpgrade<O>, io::Error>>> + Send>>;
type ListenerUpgrade<O> = Pin<Box<dyn Future<Output = io::Result<O>> + Send>>;
trait Abstract<O> {
fn listen_on(&mut self, addr: Multiaddr) -> Result<Listener<O>, TransportError<io::Error>>;
fn dial(&mut self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>>;
fn dial_as_listener(&mut self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>>;
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr>;
}
impl<T, O> Abstract<O> for T
where
T: Transport<Output = O> + 'static,
T::Error: Send + Sync,
T::Dial: Send + 'static,
T::Listener: Send + 'static,
T::ListenerUpgrade: Send + 'static,
{
fn listen_on(&mut self, addr: Multiaddr) -> Result<Listener<O>, TransportError<io::Error>> {
let listener = Transport::listen_on(self, addr).map_err(|e| e.map(box_err))?;
let fut = listener
.map_ok(|event| {
event
.map(|upgrade| {
let up = upgrade.map_err(box_err);
Box::pin(up) as ListenerUpgrade<O>
})
.map_err(box_err)
})
.map_err(box_err);
Ok(Box::pin(fut))
}
fn dial(&mut self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>> {
let fut = Transport::dial(self, addr)
.map(|r| r.map_err(box_err))
.map_err(|e| e.map(box_err))?;
Ok(Box::pin(fut) as Dial<_>)
}
fn dial_as_listener(&mut self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>> {
let fut = Transport::dial_as_listener(self, addr)
.map(|r| r.map_err(box_err))
.map_err(|e| e.map(box_err))?;
Ok(Box::pin(fut) as Dial<_>)
}
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
Transport::address_translation(self, server, observed)
}
}
impl<O> fmt::Debug for Boxed<O> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "BoxedTransport")
}
}
impl<O> Transport for Boxed<O> {
type Output = O;
type Error = io::Error;
type Listener = Listener<O>;
type ListenerUpgrade = ListenerUpgrade<O>;
type Dial = Dial<O>;
fn listen_on(
&mut self,
addr: Multiaddr,
) -> Result<Self::Listener, TransportError<Self::Error>> {
self.inner.listen_on(addr)
}
fn dial(&mut self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
self.inner.dial(addr)
}
fn dial_as_listener(
&mut self,
addr: Multiaddr,
) -> Result<Self::Dial, TransportError<Self::Error>> {
self.inner.dial_as_listener(addr)
}
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
self.inner.address_translation(server, observed)
}
}
fn box_err<E: Error + Send + Sync + 'static>(e: E) -> io::Error {
io::Error::new(io::ErrorKind::Other, e)
}