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
|
/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use std::{sync::atomic::Ordering, time::Duration};
use store::write::now;
use tokio::sync::mpsc;
use crate::core::{SmtpInstance, SMTP};
use super::{spool::QueueEventLock, DeliveryAttempt, Event, Message, OnHold, Status};
pub(crate) const SHORT_WAIT: Duration = Duration::from_millis(1);
pub(crate) const LONG_WAIT: Duration = Duration::from_secs(86400 * 365);
pub struct Queue {
pub core: SmtpInstance,
pub on_hold: Vec<OnHold<QueueEventLock>>,
pub next_wake_up: Duration,
}
impl SpawnQueue for mpsc::Receiver<Event> {
fn spawn(mut self, core: SmtpInstance) {
tokio::spawn(async move {
let mut queue = Queue::new(core);
loop {
let on_hold = match tokio::time::timeout(queue.next_wake_up, self.recv()).await {
Ok(Some(Event::OnHold(on_hold))) => on_hold.into(),
Ok(Some(Event::Stop)) | Ok(None) => {
break;
}
_ => None,
};
queue.process_events().await;
// Add message on hold
if let Some(on_hold) = on_hold {
queue.on_hold(on_hold);
}
}
});
}
}
impl Queue {
pub fn new(core: SmtpInstance) -> Self {
Queue {
core,
on_hold: Vec::with_capacity(128),
next_wake_up: SHORT_WAIT,
}
}
pub async fn process_events(&mut self) {
// Deliver any concurrency limited messages
let core = SMTP::from(self.core.clone());
while let Some(queue_event) = self.next_on_hold() {
DeliveryAttempt::new(queue_event)
.try_deliver(core.clone())
.await;
}
// Deliver scheduled messages
let now = now();
self.next_wake_up = LONG_WAIT;
for queue_event in core.next_event().await {
if queue_event.due <= now {
DeliveryAttempt::new(queue_event)
.try_deliver(core.clone())
.await;
} else {
self.next_wake_up = Duration::from_secs(queue_event.due - now);
}
}
}
pub fn on_hold(&mut self, message: OnHold<QueueEventLock>) {
self.on_hold.push(OnHold {
next_due: message.next_due,
limiters: message.limiters,
message: message.message,
});
}
pub fn next_on_hold(&mut self) -> Option<QueueEventLock> {
let now = now();
self.on_hold
.iter()
.position(|o| {
o.limiters
.iter()
.any(|l| l.concurrent.load(Ordering::Relaxed) < l.max_concurrent)
|| o.next_due.map_or(false, |due| due <= now)
})
.map(|pos| self.on_hold.remove(pos).message)
}
}
impl Message {
pub fn next_event(&self) -> Option<u64> {
let mut next_event = now();
let mut has_events = false;
for domain in &self.domains {
if matches!(
domain.status,
Status::Scheduled | Status::TemporaryFailure(_)
) {
if !has_events || domain.retry.due < next_event {
next_event = domain.retry.due;
has_events = true;
}
if domain.notify.due < next_event {
next_event = domain.notify.due;
}
if domain.expires < next_event {
next_event = domain.expires;
}
}
}
if has_events {
next_event.into()
} else {
None
}
}
pub fn next_delivery_event(&self) -> u64 {
let mut next_delivery = now();
for (pos, domain) in self
.domains
.iter()
.filter(|d| matches!(d.status, Status::Scheduled | Status::TemporaryFailure(_)))
.enumerate()
{
if pos == 0 || domain.retry.due < next_delivery {
next_delivery = domain.retry.due;
}
}
next_delivery
}
pub fn next_dsn(&self) -> u64 {
let mut next_dsn = now();
for (pos, domain) in self
.domains
.iter()
.filter(|d| matches!(d.status, Status::Scheduled | Status::TemporaryFailure(_)))
.enumerate()
{
if pos == 0 || domain.notify.due < next_dsn {
next_dsn = domain.notify.due;
}
}
next_dsn
}
pub fn expires(&self) -> u64 {
let mut expires = now();
for (pos, domain) in self
.domains
.iter()
.filter(|d| matches!(d.status, Status::Scheduled | Status::TemporaryFailure(_)))
.enumerate()
{
if pos == 0 || domain.expires < expires {
expires = domain.expires;
}
}
expires
}
pub fn next_event_after(&self, instant: u64) -> Option<u64> {
let mut next_event = None;
for domain in &self.domains {
if matches!(
domain.status,
Status::Scheduled | Status::TemporaryFailure(_)
) {
if domain.retry.due > instant
&& next_event
.as_ref()
.map_or(true, |ne| domain.retry.due.lt(ne))
{
next_event = domain.retry.due.into();
}
if domain.notify.due > instant
&& next_event
.as_ref()
.map_or(true, |ne| domain.notify.due.lt(ne))
{
next_event = domain.notify.due.into();
}
if domain.expires > instant
&& next_event.as_ref().map_or(true, |ne| domain.expires.lt(ne))
{
next_event = domain.expires.into();
}
}
}
next_event
}
}
pub trait SpawnQueue {
fn spawn(self, core: SmtpInstance);
}
|
