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
use crate::{
api::{Api, ExecuteError},
handler::UpdateHandler,
methods::GetUpdates,
types::{AllowedUpdate, Integer, ResponseError, ResponseParameters},
};
use async_stream::stream;
use futures_util::{pin_mut, stream::StreamExt};
use log::error;
use std::{cmp::max, collections::HashSet, time::Duration};
use tokio::{
sync::mpsc::{channel, Receiver, Sender},
time::delay_for,
};
const DEFAULT_LIMIT: Integer = 100;
const DEFAULT_POLL_TIMEOUT: Duration = Duration::from_secs(10);
const DEFAULT_ERROR_TIMEOUT: Duration = Duration::from_secs(5);
pub struct LongPoll<H> {
api: Api,
handler: Box<H>,
options: LongPollOptions,
sender: Sender<()>,
receiver: Receiver<()>,
}
impl<H> LongPoll<H> {
pub fn new(api: Api, handler: H) -> Self {
let (sender, receiver) = channel(1);
Self {
api,
handler: Box::new(handler),
options: LongPollOptions::default(),
sender,
receiver,
}
}
pub fn options(mut self, options: LongPollOptions) -> Self {
self.options = options;
self
}
}
impl<H> LongPoll<H>
where
H: UpdateHandler + Send,
{
pub fn get_handle(&self) -> LongPollHandle {
LongPollHandle {
sender: self.sender.clone(),
}
}
pub async fn run(mut self) {
let LongPollOptions {
mut offset,
limit,
poll_timeout,
error_timeout,
allowed_updates,
} = self.options;
let api = self.api.clone();
let mut receiver = self.receiver;
let s = stream! {
loop {
if receiver.try_recv().is_ok() {
receiver.close();
break;
}
let method = GetUpdates::default()
.offset(offset + 1)
.limit(limit)
.timeout(poll_timeout)
.allowed_updates(allowed_updates.clone());
let updates = match api.execute(method).await {
Ok(updates) => updates,
Err(err) => {
error!("An error has occurred while getting updates: {}", err);
let timeout = get_error_timeout(err, error_timeout);
delay_for(error_timeout).await;
continue
}
};
for update in updates {
offset = max(offset, update.id);
yield update
}
}
};
pin_mut!(s);
while let Some(update) = s.next().await {
self.handler.handle(update).await;
}
}
}
pub struct LongPollHandle {
sender: Sender<()>,
}
impl LongPollHandle {
pub async fn shutdown(mut self) {
let _ = self.sender.send(()).await;
}
}
fn get_error_timeout(err: ExecuteError, default_timeout: Duration) -> Duration {
if let ExecuteError::Response(ResponseError {
parameters: Some(ResponseParameters {
retry_after: Some(retry_after),
..
}),
..
}) = err
{
Duration::from_secs(retry_after as u64)
} else {
default_timeout
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct LongPollOptions {
offset: Integer,
limit: Integer,
poll_timeout: Duration,
error_timeout: Duration,
allowed_updates: HashSet<AllowedUpdate>,
}
impl LongPollOptions {
pub fn limit(mut self, limit: Integer) -> Self {
self.limit = limit;
self
}
pub fn poll_timeout(mut self, poll_timeout: Duration) -> Self {
self.poll_timeout = poll_timeout;
self
}
pub fn error_timeout(mut self, error_timeout: u64) -> Self {
self.error_timeout = Duration::from_secs(error_timeout);
self
}
pub fn allowed_update(mut self, allowed_update: AllowedUpdate) -> Self {
self.allowed_updates.insert(allowed_update);
self
}
}
impl Default for LongPollOptions {
fn default() -> Self {
LongPollOptions {
offset: 0,
limit: DEFAULT_LIMIT,
poll_timeout: DEFAULT_POLL_TIMEOUT,
error_timeout: DEFAULT_ERROR_TIMEOUT,
allowed_updates: HashSet::new(),
}
}
}