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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
use crate::{
connection::{ConnectedPoint, Endpoint},
either::EitherError,
transport::{ListenerEvent, Transport, TransportError},
};
use futures::{future::Either, prelude::*};
use multiaddr::Multiaddr;
use std::{error, marker::PhantomPinned, pin::Pin, task::Context, task::Poll};
#[derive(Debug, Clone)]
pub struct AndThen<T, C> {
transport: T,
fun: C,
}
impl<T, C> AndThen<T, C> {
pub(crate) fn new(transport: T, fun: C) -> Self {
AndThen { transport, fun }
}
}
impl<T, C, F, O> Transport for AndThen<T, C>
where
T: Transport,
C: FnOnce(T::Output, ConnectedPoint) -> F + Clone,
F: TryFuture<Ok = O>,
F::Error: error::Error,
{
type Output = O;
type Error = EitherError<T::Error, F::Error>;
type Listener = AndThenStream<T::Listener, C>;
type ListenerUpgrade = AndThenFuture<T::ListenerUpgrade, C, F>;
type Dial = AndThenFuture<T::Dial, C, F>;
fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
let listener = self
.transport
.listen_on(addr)
.map_err(|err| err.map(EitherError::A))?;
let stream = AndThenStream {
stream: listener,
fun: self.fun,
};
Ok(stream)
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
let dialed_fut = self
.transport
.dial(addr.clone())
.map_err(|err| err.map(EitherError::A))?;
let future = AndThenFuture {
inner: Either::Left(Box::pin(dialed_fut)),
args: Some((
self.fun,
ConnectedPoint::Dialer {
address: addr,
role_override: Endpoint::Dialer,
},
)),
_marker: PhantomPinned,
};
Ok(future)
}
fn dial_as_listener(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
let dialed_fut = self
.transport
.dial_as_listener(addr.clone())
.map_err(|err| err.map(EitherError::A))?;
let future = AndThenFuture {
inner: Either::Left(Box::pin(dialed_fut)),
args: Some((
self.fun,
ConnectedPoint::Dialer {
address: addr,
role_override: Endpoint::Listener,
},
)),
_marker: PhantomPinned,
};
Ok(future)
}
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
self.transport.address_translation(server, observed)
}
}
#[pin_project::pin_project]
#[derive(Debug, Clone)]
pub struct AndThenStream<TListener, TMap> {
#[pin]
stream: TListener,
fun: TMap,
}
impl<TListener, TMap, TTransOut, TMapOut, TListUpgr, TTransErr> Stream
for AndThenStream<TListener, TMap>
where
TListener: TryStream<Ok = ListenerEvent<TListUpgr, TTransErr>, Error = TTransErr>,
TListUpgr: TryFuture<Ok = TTransOut, Error = TTransErr>,
TMap: FnOnce(TTransOut, ConnectedPoint) -> TMapOut + Clone,
TMapOut: TryFuture,
{
type Item = Result<
ListenerEvent<
AndThenFuture<TListUpgr, TMap, TMapOut>,
EitherError<TTransErr, TMapOut::Error>,
>,
EitherError<TTransErr, TMapOut::Error>,
>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let this = self.project();
match TryStream::try_poll_next(this.stream, cx) {
Poll::Ready(Some(Ok(event))) => {
let event = match event {
ListenerEvent::Upgrade {
upgrade,
local_addr,
remote_addr,
} => {
let point = ConnectedPoint::Listener {
local_addr: local_addr.clone(),
send_back_addr: remote_addr.clone(),
};
ListenerEvent::Upgrade {
upgrade: AndThenFuture {
inner: Either::Left(Box::pin(upgrade)),
args: Some((this.fun.clone(), point)),
_marker: PhantomPinned,
},
local_addr,
remote_addr,
}
}
ListenerEvent::NewAddress(a) => ListenerEvent::NewAddress(a),
ListenerEvent::AddressExpired(a) => ListenerEvent::AddressExpired(a),
ListenerEvent::Error(e) => ListenerEvent::Error(EitherError::A(e)),
};
Poll::Ready(Some(Ok(event)))
}
Poll::Ready(Some(Err(err))) => Poll::Ready(Some(Err(EitherError::A(err)))),
Poll::Ready(None) => Poll::Ready(None),
Poll::Pending => Poll::Pending,
}
}
}
#[derive(Debug)]
pub struct AndThenFuture<TFut, TMap, TMapOut> {
inner: Either<Pin<Box<TFut>>, Pin<Box<TMapOut>>>,
args: Option<(TMap, ConnectedPoint)>,
_marker: PhantomPinned,
}
impl<TFut, TMap, TMapOut> Future for AndThenFuture<TFut, TMap, TMapOut>
where
TFut: TryFuture,
TMap: FnOnce(TFut::Ok, ConnectedPoint) -> TMapOut,
TMapOut: TryFuture,
{
type Output = Result<TMapOut::Ok, EitherError<TFut::Error, TMapOut::Error>>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
loop {
let future = match &mut self.inner {
Either::Left(future) => {
let item = match TryFuture::try_poll(future.as_mut(), cx) {
Poll::Ready(Ok(v)) => v,
Poll::Ready(Err(err)) => return Poll::Ready(Err(EitherError::A(err))),
Poll::Pending => return Poll::Pending,
};
let (f, a) = self
.args
.take()
.expect("AndThenFuture has already finished.");
f(item, a)
}
Either::Right(future) => {
return match TryFuture::try_poll(future.as_mut(), cx) {
Poll::Ready(Ok(v)) => Poll::Ready(Ok(v)),
Poll::Ready(Err(err)) => return Poll::Ready(Err(EitherError::B(err))),
Poll::Pending => Poll::Pending,
}
}
};
self.inner = Either::Right(Box::pin(future));
}
}
}
impl<TFut, TMap, TMapOut> Unpin for AndThenFuture<TFut, TMap, TMapOut> {}