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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;
#[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 {
pub fn timeout(&mut self, timeout: Duration) -> &mut Self {
self.timeout = timeout;
self
}
pub fn allowed_updates(&mut self, allowed_updates: &[AllowedUpdate]) -> &mut Self {
self.allowed_updates = allowed_updates.to_vec();
self
}
pub fn limit(&mut self, limit: Integer) -> &mut Self {
self.limit = limit;
self
}
pub fn error_delay(&mut self, delay: Duration) -> &mut Self {
self.error_delay = delay;
self
}
}