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
use std::{cmp::max, collections::VecDeque, time::Duration};
use futures::{task, Async, Future, Poll, Stream};
use tokio_timer;
use telegram_bot_fork_raw::{AllowedUpdate, GetUpdates, Integer, Update};
use api::Api;
use errors::Error;
use future::{NewTelegramFuture, TelegramFuture};
const TELEGRAM_LONG_POLL_TIMEOUT_SECONDS: u64 = 5;
const TELEGRAM_LONG_POLL_LIMIT_MESSAGES: Integer = 100;
const TELEGRAM_LONG_POLL_ERROR_DELAY_MILLISECONDS: u64 = 500;
/// This type represents stream of Telegram API updates and uses
/// long polling method under the hood.
#[must_use = "streams do nothing unless polled"]
pub struct UpdatesStream {
api: Api,
last_update: Integer,
buffer: VecDeque<Update>,
current_request: Option<TelegramFuture<Option<Vec<Update>>>>,
timeout: Duration,
allowed_updates: Vec<AllowedUpdate>,
limit: Integer,
error_delay: Duration,
}
impl Stream for UpdatesStream {
type Item = Update;
type Error = Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
if let Some(value) = self.buffer.pop_front() {
return Ok(Async::Ready(Some(value)));
}
let result = match self.current_request {
Some(ref mut current_request) => {
let polled_update = current_request.poll();
match polled_update {
Ok(Async::Ready(Some(updates))) => {
for update in updates {
self.last_update = max(update.id, self.last_update);
self.buffer.push_back(update)
}
Ok(true)
}
Ok(Async::Ready(None)) => Ok(false),
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(err) => Err(err),
}
}
None => Ok(false),
};
match result {
Ok(true) => {
self.current_request = None;
task::current().notify();
Ok(Async::NotReady)
}
Ok(false) => {
let timeout = self.timeout + Duration::from_secs(1);
let request = self.api.send_timeout(
GetUpdates::new()
.offset(self.last_update + 1)
.timeout(self.timeout.as_secs() as Integer)
.allowed_updates(&self.allowed_updates)
.limit(self.limit),
timeout,
);
self.current_request = Some(request);
task::current().notify();
Ok(Async::NotReady)
}
Err(err) => {
let timeout_future = tokio_timer::sleep(self.error_delay)
.from_err()
.map(|()| None);
self.current_request = Some(TelegramFuture::new(Box::new(timeout_future)));
Err(err)
}
}
}
}
pub trait NewUpdatesStream {
fn new(api: Api) -> Self;
}
impl NewUpdatesStream for UpdatesStream {
fn new(api: Api) -> Self {
UpdatesStream {
api,
last_update: 0,
buffer: VecDeque::new(),
current_request: None,
timeout: Duration::from_secs(TELEGRAM_LONG_POLL_TIMEOUT_SECONDS),
allowed_updates: Vec::new(),
limit: TELEGRAM_LONG_POLL_LIMIT_MESSAGES,
error_delay: Duration::from_millis(TELEGRAM_LONG_POLL_ERROR_DELAY_MILLISECONDS),
}
}
}
impl UpdatesStream {
/// Set timeout for long polling requests, this corresponds with `timeout` field
/// in [getUpdates](https://core.telegram.org/bots/api#getupdates) method,
/// also this stream sets an additional request timeout for `timeout + 1 second`
/// in case of invalid Telegram API server behaviour.
///
/// Default timeout is 5 seconds.
pub fn timeout(&mut self, timeout: Duration) -> &mut Self {
self.timeout = timeout;
self
}
/// Set timeout for long polling requests, this corresponds with `allowed_updates` field
/// in [getUpdates](https://core.telegram.org/bots/api#getupdates) method.
/// List the types of updates you want your bot to receive. For example,
/// specify [“message”, “edited_channel_post”, “callback_query”] to only receive updates of these types.
/// See Update for a complete list of available update types. Specify an empty list to receive all
/// updates regardless of type (default). If not specified, the previous setting will be used.
///
/// Please note that this parameter doesn't affect updates created before the call to the getUpdates,
/// so unwanted updates may be received for a short period of time.
pub fn allowed_updates(&mut self, allowed_updates: &[AllowedUpdate]) -> &mut Self {
self.allowed_updates = allowed_updates.to_vec();
self
}
/// Set limits the number of updates to be retrieved, this corresponds with `limit` field
/// in [getUpdates](https://core.telegram.org/bots/api#getupdates) method.
/// Values between 1—100 are accepted.
///
/// Defaults to 100.
pub fn limit(&mut self, limit: Integer) -> &mut Self {
self.limit = limit;
self
}
/// Set a delay between erroneous request and next request.
/// This delay prevents busy looping in some cases.
///
/// Default delay is 500 ms.
pub fn error_delay(&mut self, delay: Duration) -> &mut Self {
self.error_delay = delay;
self
}
}