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

use std::{
    marker::PhantomData,
    net::SocketAddr,
    task::{Context, Poll},
};

use actix_service::{Service, ServiceFactory as BaseServiceFactory};
use actix_utils::future::{ready, Ready};
use futures_core::future::LocalBoxFuture;
use tracing::error;

use crate::{
    socket::{FromStream, MioStream},
    worker::WorkerCounterGuard,
};

#[doc(hidden)]
pub trait ServerServiceFactory<Stream: FromStream>: Send + Clone + 'static {
    type Factory: BaseServiceFactory<Stream, Config = ()>;

    fn create(&self) -> Self::Factory;
}

pub(crate) trait InternalServiceFactory: Send {
    fn name(&self, token: usize) -> &str;

    fn clone_factory(&self) -> Box<dyn InternalServiceFactory>;

    fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>>;
}

pub(crate) type BoxedServerService = Box<
    dyn Service<
        (WorkerCounterGuard, MioStream),
        Response = (),
        Error = (),
        Future = Ready<Result<(), ()>>,
    >,
>;

pub(crate) struct StreamService<S, I> {
    service: S,
    _phantom: PhantomData<I>,
}

impl<S, I> StreamService<S, I> {
    pub(crate) fn new(service: S) -> Self {
        StreamService {
            service,
            _phantom: PhantomData,
        }
    }
}

impl<S, I> Service<(WorkerCounterGuard, MioStream)> for StreamService<S, I>
where
    S: Service<I>,
    S::Future: 'static,
    S::Error: 'static,
    I: FromStream,
{
    type Response = ();
    type Error = ();
    type Future = Ready<Result<(), ()>>;

    fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.service.poll_ready(ctx).map_err(|_| ())
    }

    fn call(&self, (guard, req): (WorkerCounterGuard, MioStream)) -> Self::Future {
        ready(match FromStream::from_mio(req) {
            Ok(stream) => {
                let f = self.service.call(stream);
                actix_rt::spawn(async move {
                    let _ = f.await;
                    drop(guard);
                });
                Ok(())
            }
            Err(err) => {
                error!("can not convert to an async TCP stream: {}", err);
                Err(())
            }
        })
    }
}

pub(crate) struct StreamNewService<F: ServerServiceFactory<Io>, Io: FromStream> {
    name: String,
    inner: F,
    token: usize,
    addr: SocketAddr,
    _t: PhantomData<Io>,
}

impl<F, Io> StreamNewService<F, Io>
where
    F: ServerServiceFactory<Io>,
    Io: FromStream + Send + 'static,
{
    pub(crate) fn create(
        name: String,
        token: usize,
        inner: F,
        addr: SocketAddr,
    ) -> Box<dyn InternalServiceFactory> {
        Box::new(Self {
            name,
            token,
            inner,
            addr,
            _t: PhantomData,
        })
    }
}

impl<F, Io> InternalServiceFactory for StreamNewService<F, Io>
where
    F: ServerServiceFactory<Io>,
    Io: FromStream + Send + 'static,
{
    fn name(&self, _: usize) -> &str {
        &self.name
    }

    fn clone_factory(&self) -> Box<dyn InternalServiceFactory> {
        Box::new(Self {
            name: self.name.clone(),
            inner: self.inner.clone(),
            token: self.token,
            addr: self.addr,
            _t: PhantomData,
        })
    }

    fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>> {
        let token = self.token;
        let fut = self.inner.create().new_service(());
        Box::pin(async move {
            match fut.await {
                Ok(inner) => {
                    let service = Box::new(StreamService::new(inner)) as _;
                    Ok((token, service))
                }
                Err(_) => Err(()),
            }
        })
    }
}

impl<F, T, I> ServerServiceFactory<I> for F
where
    F: Fn() -> T + Send + Clone + 'static,
    T: BaseServiceFactory<I, Config = ()>,
    I: FromStream,
{
    type Factory = T;

    fn create(&self) -> T {
        (self)()
    }
}