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

use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

use futures::future::FutureExt;

use crate::{Service, ServiceFactory};

pub type BoxFuture<I, E> = Pin<Box<dyn Future<Output = Result<I, E>>>>;

pub type BoxService<Req, Res, Err> =
    Box<dyn Service<Request = Req, Response = Res, Error = Err, Future = BoxFuture<Res, Err>>>;

pub struct BoxServiceFactory<C, Req, Res, Err, InitErr>(Inner<C, Req, Res, Err, InitErr>);

/// Create boxed new service
pub fn factory<T>(
    factory: T,
) -> BoxServiceFactory<T::Config, T::Request, T::Response, T::Error, T::InitError>
where
    T: ServiceFactory + 'static,
    T::Request: 'static,
    T::Response: 'static,
    T::Service: 'static,
    T::Future: 'static,
    T::Error: 'static,
    T::InitError: 'static,
{
    BoxServiceFactory(Box::new(FactoryWrapper {
        factory,
        _t: std::marker::PhantomData,
    }))
}

/// Create boxed service
pub fn service<T>(service: T) -> BoxService<T::Request, T::Response, T::Error>
where
    T: Service + 'static,
    T::Future: 'static,
{
    Box::new(ServiceWrapper(service))
}

type Inner<C, Req, Res, Err, InitErr> = Box<
    dyn ServiceFactory<
        Config = C,
        Request = Req,
        Response = Res,
        Error = Err,
        InitError = InitErr,
        Service = BoxService<Req, Res, Err>,
        Future = BoxFuture<BoxService<Req, Res, Err>, InitErr>,
    >,
>;

impl<C, Req, Res, Err, InitErr> ServiceFactory for BoxServiceFactory<C, Req, Res, Err, InitErr>
where
    Req: 'static,
    Res: 'static,
    Err: 'static,
    InitErr: 'static,
{
    type Request = Req;
    type Response = Res;
    type Error = Err;
    type InitError = InitErr;
    type Config = C;
    type Service = BoxService<Req, Res, Err>;

    type Future = BoxFuture<Self::Service, InitErr>;

    fn new_service(&self, cfg: C) -> Self::Future {
        self.0.new_service(cfg)
    }
}

struct FactoryWrapper<C, T: ServiceFactory> {
    factory: T,
    _t: std::marker::PhantomData<C>,
}

impl<C, T, Req, Res, Err, InitErr> ServiceFactory for FactoryWrapper<C, T>
where
    Req: 'static,
    Res: 'static,
    Err: 'static,
    InitErr: 'static,
    T: ServiceFactory<
        Config = C,
        Request = Req,
        Response = Res,
        Error = Err,
        InitError = InitErr,
    >,
    T::Future: 'static,
    T::Service: 'static,
    <T::Service as Service>::Future: 'static,
{
    type Request = Req;
    type Response = Res;
    type Error = Err;
    type InitError = InitErr;
    type Config = C;
    type Service = BoxService<Req, Res, Err>;
    type Future = BoxFuture<Self::Service, Self::InitError>;

    fn new_service(&self, cfg: C) -> Self::Future {
        Box::pin(
            self.factory
                .new_service(cfg)
                .map(|res| res.map(ServiceWrapper::boxed)),
        )
    }
}

struct ServiceWrapper<T: Service>(T);

impl<T> ServiceWrapper<T>
where
    T: Service + 'static,
    T::Future: 'static,
{
    fn boxed(service: T) -> BoxService<T::Request, T::Response, T::Error> {
        Box::new(ServiceWrapper(service))
    }
}

impl<T, Req, Res, Err> Service for ServiceWrapper<T>
where
    T: Service<Request = Req, Response = Res, Error = Err>,
    T::Future: 'static,
{
    type Request = Req;
    type Response = Res;
    type Error = Err;
    type Future = BoxFuture<Res, Err>;

    fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.0.poll_ready(ctx)
    }

    fn call(&mut self, req: Self::Request) -> Self::Future {
        Box::pin(self.0.call(req))
    }
}