neutron 0.0.2

A Rust client library for Pulsar
Documentation 
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


use futures::FutureExt;

use crate::{
    broker_address::BrokerAddress,
    command_resolver::CommandResolver,
    engine::EngineConnection,
    message::{Command, Inbound, Outbound},
    NeutronError,
};

#[derive(Clone)]
pub struct ClientData {
    pub id: u64,
    pub broker_address: BrokerAddress,
    pub topic: String,
}

#[derive(Debug)]
pub(crate) struct ClientConnection {
    pub(crate) id: u64,
    pub(crate) connection: EngineConnection<Inbound, Command<Outbound, Inbound>>,
    pub(crate) topic: String,
    pub(crate) broker_address: BrokerAddress,
}

impl From<&ClientConnection> for ClientData {
    fn from(val: &ClientConnection) -> Self {
        ClientData {
            id: val.id,
            broker_address: val.broker_address.clone(),
            topic: val.topic.clone(),
        }
    }
}

impl ClientConnection {
    fn get_connection(&self) -> &EngineConnection<Inbound, Command<Outbound, Inbound>> {
        &self.connection
    }

    fn broker_address(&self) -> &BrokerAddress {
        &self.broker_address
    }
}

pub(crate) struct ClientManager {
    clients: Vec<ClientConnection>,
    pub(crate) command_resolver: CommandResolver<Outbound, Inbound>,
}

impl ClientManager {
    pub(crate) fn new() -> Self {
        ClientManager {
            clients: Vec::new(),
            command_resolver: CommandResolver::new(),
        }
    }

    pub(crate) fn add_client(&mut self, client: ClientConnection) {
        self.clients.push(client);
    }

    pub(crate) fn is_empty(&self) -> bool {
        self.clients.is_empty()
    }

    pub(crate) async fn next(&self) -> (ClientData, Result<Outbound, NeutronError>) {
        let (next, _, _) = futures::future::select_all(self.clients.iter().map(|client| {
            async {
                let connection = client.get_connection();
                let message = connection.recv().await;
                (client.into(), message)
            }
            .boxed()
        }))
        .await;

        let outbound = match next.1 {
            Ok(cmd) => match cmd {
                Command::RequestResponse(outbound, sender) => {
                    self.command_resolver.put(outbound.clone(), sender).await;
                    Ok(outbound)
                }
                _ => Ok(cmd.get_outbound()),
            },
            Err(err) => Err(err),
        };

        (next.0, outbound)
    }

    pub(crate) async fn send(
        &self,
        inbound: &Inbound,
        broker_address: &BrokerAddress,
    ) -> Result<(), NeutronError> {
        if self.command_resolver.try_resolve(inbound.clone()).await {
            return Ok(());
        }

        let consumer_or_producer_id = inbound.try_consumer_or_producer_id();

        let clients = self
            .clients
            .iter()
            .filter(|client| client.broker_address() == broker_address)
            .filter(|client| {
                if let Some(id) = consumer_or_producer_id {
                    client.id == id
                } else {
                    true
                }
            });

        futures::future::join_all(clients.map(|client| async {
            let connection = client.get_connection();
            connection.send(Ok(inbound.clone())).await
        }))
        .await;

        Ok(())
    }

    #[allow(dead_code)]
    pub(crate) async fn send_all(
        &self,
        inbound: &Result<Inbound, NeutronError>,
    ) -> Result<(), NeutronError> {
        let clients = self.clients.iter().map(|client| {
            let connection = client.get_connection();
            connection.send(inbound.clone())
        });

        futures::future::join_all(clients).await;

        Ok(())
    }

    pub(crate) fn move_client_to_broker(&mut self, id: u64, broker_address: &BrokerAddress) {
        for client in self.clients.iter_mut() {
            if client.id == id {
                client.broker_address = broker_address.clone();
            }
        }
    }

    pub(crate) fn get_client(&self, id: u64) -> Option<&ClientConnection> {
        self.clients.iter().find(|client| client.id == id)
    }
}