nautalid 0.1.0

Scratch container substrate — TLS 1.3 HTTP/2+3 kernel, LID/AetherDB, optional filter bus (GPL-3.0-or-later).
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

use crate::zeromq::codec::{Message, ZmqFramedRead};
use crate::zeromq::endpoint::Endpoint;
use crate::zeromq::error::{ZmqError, ZmqResult};
use crate::zeromq::fair_queue::FairQueue;
use crate::zeromq::message::ZmqMessage;
use crate::zeromq::sub::{SubBackendMsgType, SubSocketBackend};
use crate::zeromq::transport::AcceptStopHandle;
use crate::zeromq::util::PeerIdentity;
use crate::zeromq::{
    MultiPeerBackend, Socket, SocketBackend, SocketEvent, SocketOptions, SocketRecv, SocketSend,
    SocketType,
};

use async_trait::async_trait;
use futures_channel::mpsc;
use futures_util::{SinkExt, StreamExt};

use std::collections::HashMap;
use std::sync::Arc;

pub struct XSubSocket {
    backend: Arc<SubSocketBackend>,
    fair_queue: FairQueue<ZmqFramedRead, PeerIdentity>,
    binds: HashMap<Endpoint, AcceptStopHandle>,
}

impl Drop for XSubSocket {
    fn drop(&mut self) {
        self.backend.shutdown();
    }
}

impl XSubSocket {
    pub async fn subscribe(&mut self, subscription: &str) -> ZmqResult<()> {
        self.backend.subs.lock().insert(subscription.to_string());
        let message =
            SubSocketBackend::create_subs_message(subscription, SubBackendMsgType::SUBSCRIBE);
        for mut peer in self.backend.peers.iter_mut() {
            peer.send_queue
                .send(Message::Message(message.clone()))
                .await?;
        }
        Ok(())
    }

    pub async fn unsubscribe(&mut self, subscription: &str) -> ZmqResult<()> {
        self.backend.subs.lock().remove(subscription);
        let message =
            SubSocketBackend::create_subs_message(subscription, SubBackendMsgType::UNSUBSCRIBE);
        for mut peer in self.backend.peers.iter_mut() {
            peer.send_queue
                .send(Message::Message(message.clone()))
                .await?;
        }
        Ok(())
    }

    fn apply_subscription_send(&self, message: &ZmqMessage) -> bool {
        let Some(first) = message.get(0) else {
            return false;
        };
        if first.is_empty() {
            return false;
        }
        match first[0] {
            1 => {
                if let Ok(sub) = std::str::from_utf8(&first[1..]) {
                    self.backend.subs.lock().insert(sub.to_string());
                }
                true
            }
            0 => {
                if let Ok(sub) = std::str::from_utf8(&first[1..]) {
                    self.backend.subs.lock().remove(sub);
                }
                true
            }
            _ => false,
        }
    }
}

#[async_trait]
impl Socket for XSubSocket {
    fn with_options(options: SocketOptions) -> Self {
        let fair_queue = FairQueue::new(true);
        Self {
            backend: Arc::new(SubSocketBackend::with_options(
                Some(fair_queue.inner()),
                SocketType::XSUB,
                options,
            )),
            fair_queue,
            binds: HashMap::new(),
        }
    }

    fn backend(&self) -> Arc<dyn MultiPeerBackend> {
        self.backend.clone()
    }

    fn binds(&mut self) -> &mut HashMap<Endpoint, AcceptStopHandle> {
        &mut self.binds
    }

    fn monitor(&mut self) -> mpsc::Receiver<SocketEvent> {
        let (sender, receiver) = mpsc::channel(1024);
        self.backend.socket_monitor.lock().replace(sender);
        receiver
    }
}

#[async_trait]
impl SocketRecv for XSubSocket {
    async fn recv(&mut self) -> ZmqResult<ZmqMessage> {
        loop {
            match self.fair_queue.next().await {
                Some((_peer_id, Ok(Message::Message(message)))) => return Ok(message),
                Some((_peer_id, Ok(_))) => {}
                Some((peer_id, Err(_))) => {
                    self.backend.peer_disconnected(&peer_id);
                }
                None => return Err(ZmqError::NoMessage),
            }
        }
    }
}

#[async_trait]
impl SocketSend for XSubSocket {
    async fn send(&mut self, message: ZmqMessage) -> ZmqResult<()> {
        if !self.apply_subscription_send(&message) {
            return Err(ZmqError::Other(
                "XSUB send accepts subscription frames (0x01/0x00 prefix) only",
            ));
        }
        for mut peer in self.backend.peers.iter_mut() {
            peer.send_queue
                .send(Message::Message(message.clone()))
                .await?;
        }
        Ok(())
    }
}