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

use crate::{
    packet::{
        Advice,
        Channel,
        ConnectionType,
        Packet,
    },
    transport::WsTransport,
    CometError,
    CometResult,
};
use std::sync::{
    Arc,
    Mutex,
};

#[derive(Clone)]
pub struct Context {
    pub(crate) inner: Arc<Mutex<ContextState>>,
    transport: WsTransport, // TODO: Replace with request buffer?
}

impl Context {
    pub(crate) fn new(transport: WsTransport) -> Self {
        Self {
            inner: Arc::new(Mutex::new(ContextState {
                client_id: None,
                is_reconnect: true,

                request_buffer: Vec::new(),
            })),
            transport,
        }
    }

    /// Send a single packet. Inefficient.
    pub async fn send_packet(&self, packet: Packet) -> CometResult<()> {
        self.transport.send_packet(vec![packet]).await // TODO: Batch and send?
    }

    /// Queue a single packet. Will not send immediately until the next call to `send_buffered_packets`.
    pub fn queue_packet(&self, packet: Packet) {
        self.inner.lock().unwrap().request_buffer.push(packet);
    }

    /// Send buffered packets
    pub async fn send_buffered_packets(&self) -> CometResult<()> {
        let packets = {
            let mut lock = self.inner.lock().unwrap();
            let request_buffer = &mut lock.request_buffer;

            if request_buffer.is_empty() {
                return Ok(());
            }

            std::mem::take(request_buffer)
        };
        self.transport.send_packet(packets).await
    }

    pub async fn send_handshake(&self) -> CometResult<()> {
        let handshake_packet = Packet::new()
            .channel(Channel::Handshake)
            .version("1.0".to_string())
            .minimum_version("1.0".to_string())
            .supported_connection_types(vec![ConnectionType::WebSocket])
            .advice(Advice::new().timeout(60_000).interval(0));

        self.send_packet(handshake_packet).await
    }

    /// Queue a handshake packet
    pub fn queue_handshake(&self) {
        let handshake_packet = Packet::new()
            .channel(Channel::Handshake)
            .version("1.0".to_string())
            .minimum_version("1.0".to_string())
            .supported_connection_types(vec![ConnectionType::WebSocket])
            .advice(Advice::new().timeout(60_000).interval(0));

        self.queue_packet(handshake_packet)
    }

    pub async fn send_connect(&self) -> CometResult<()> {
        let client_id = self.get_client_id().ok_or(CometError::MissingClientId)?;
        let connect_packet = Packet::new()
            .channel(Channel::Connect)
            .client_id(client_id)
            .advice(Advice::new())
            .connection_type(ConnectionType::WebSocket);

        self.send_packet(connect_packet).await
    }

    /// Queue a connect packet
    pub fn queue_connect(&self) -> CometResult<()> {
        let client_id = self.get_client_id().ok_or(CometError::MissingClientId)?;
        let connect_packet = Packet::new()
            .channel(Channel::Connect)
            .client_id(client_id)
            .advice(Advice::new())
            .connection_type(ConnectionType::WebSocket);

        self.queue_packet(connect_packet);

        Ok(())
    }

    pub async fn subscribe(&self, s: &str) -> CometResult<()> {
        let packet = Packet::new()
            .channel(Channel::Subscribe)
            .client_id(self.get_client_id().ok_or(CometError::MissingClientId)?)
            .subscription(s.into());

        self.send_packet(packet).await
    }

    pub async fn shutdown(&self) -> CometResult<()> {
        self.transport.graceful_shutdown().await
    }

    pub fn get_client_id(&self) -> Option<String> {
        self.inner.lock().unwrap().client_id.as_ref().cloned()
    }
}

pub struct ContextState {
    pub(crate) client_id: Option<String>,
    pub(crate) is_reconnect: bool,

    pub(crate) request_buffer: Vec<Packet>,
}