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

use crate::{spawn, TestTransport};
use async_channel::{Receiver, Sender};
use dashmap::DashMap;
use once_cell::sync::Lazy;
use std::{
    future::Future,
    io::{Error, ErrorKind, Result},
    pin::Pin,
};
use trillium::Info;
use trillium_server_common::{Acceptor, Config, ConfigExt, Connector, Server};
use url::Url;

type Servers = Lazy<DashMap<(String, u16), (Sender<TestTransport>, Receiver<TestTransport>)>>;
static SERVERS: Servers = Lazy::new(Default::default);

/// A [`Server`] for testing that does not depend on any runtime
#[derive(Debug)]
pub struct RuntimelessServer {
    host: String,
    port: u16,
    channel: Receiver<TestTransport>,
}

impl Server for RuntimelessServer {
    type Transport = TestTransport;
    const DESCRIPTION: &'static str = "test server";
    fn accept(&mut self) -> Pin<Box<dyn Future<Output = Result<Self::Transport>> + Send + '_>> {
        Box::pin(async move {
            self.channel
                .recv()
                .await
                .map_err(|e| Error::new(ErrorKind::Other, e.to_string()))
        })
    }

    fn build_listener<A>(config: &Config<Self, A>) -> Self
    where
        A: Acceptor<Self::Transport>,
    {
        let mut port = config.port();
        let host = config.host();
        if port == 0 {
            loop {
                port = fastrand::u16(..);
                if !SERVERS.contains_key(&(host.clone(), port)) {
                    break;
                }
            }
        }

        let entry = SERVERS
            .entry((host.clone(), port))
            .or_insert_with(async_channel::unbounded);

        let (_, channel) = entry.value();

        Self {
            host,
            channel: channel.clone(),
            port,
        }
    }

    fn info(&self) -> Info {
        Info::from(&*format!("{}:{}", &self.host, &self.port))
    }

    fn block_on(fut: impl Future<Output = ()> + 'static) {
        crate::block_on(fut)
    }

    fn spawn(fut: impl Future<Output = ()> + Send + 'static) {
        spawn(fut);
    }
}

impl Drop for RuntimelessServer {
    fn drop(&mut self) {
        SERVERS.remove(&(self.host.clone(), self.port));
    }
}

/// An in-memory Connector to use with GenericServer.
#[derive(Default, Debug, Clone, Copy)]
pub struct RuntimelessClientConfig(());

impl RuntimelessClientConfig {
    /// constructs a GenericClientConfig
    pub fn new() -> Self {
        Self(())
    }
}

#[trillium::async_trait]
impl Connector for RuntimelessClientConfig {
    type Transport = TestTransport;
    async fn connect(&self, url: &Url) -> Result<Self::Transport> {
        let (tx, _) = &*SERVERS
            .get(&(
                url.host_str().unwrap().to_string(),
                url.port_or_known_default().unwrap(),
            ))
            .ok_or(Error::new(ErrorKind::AddrNotAvailable, "not available"))?;
        let (client_transport, server_transport) = TestTransport::new();
        tx.send(server_transport).await.unwrap();
        Ok(client_transport)
    }

    fn spawn<Fut: Future<Output = ()> + Send + 'static>(&self, fut: Fut) {
        spawn(fut);
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use crate::{harness, TestResult};
    use test_harness::test;
    #[test(harness)]
    async fn round_trip() -> TestResult {
        let handle1 = Config::<RuntimelessServer, ()>::new()
            .with_host("host.com")
            .with_port(80)
            .spawn("server 1");
        handle1.info().await;

        let handle2 = Config::<RuntimelessServer, ()>::new()
            .with_host("other_host.com")
            .with_port(80)
            .spawn("server 2");
        handle2.info().await;

        let client = trillium_client::Client::new(RuntimelessClientConfig::default());
        let mut conn = client.get("http://host.com").await?;
        assert_eq!(conn.response_body().await?, "server 1");

        let mut conn = client.get("http://other_host.com").await?;
        assert_eq!(conn.response_body().await?, "server 2");

        handle1.stop().await;
        assert!(client.get("http://host.com").await.is_err());
        assert!(client.get("http://other_host.com").await.is_ok());

        handle2.stop().await;
        assert!(client.get("http://other_host.com").await.is_err());

        assert!(SERVERS.is_empty());

        Ok(())
    }
}