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

use std::marker::PhantomData;

use super::{IntoServiceFactory, ServiceFactory};

/// Adapt external config argument to a config for provided service factory
///
/// Note that this function consumes the receiving service factory and returns
/// a wrapped version of it.
pub fn map_config<T, U, F, C>(factory: U, f: F) -> MapConfig<T, F, C>
where
    T: ServiceFactory,
    U: IntoServiceFactory<T>,
    F: Fn(C) -> T::Config,
{
    MapConfig::new(factory.into_factory(), f)
}

/// Replace config with unit
pub fn unit_config<T, U, C>(factory: U) -> UnitConfig<T, C>
where
    T: ServiceFactory<Config = ()>,
    U: IntoServiceFactory<T>,
{
    UnitConfig::new(factory.into_factory())
}

/// `map_config()` adapter service factory
pub struct MapConfig<A, F, C> {
    a: A,
    f: F,
    e: PhantomData<C>,
}

impl<A, F, C> MapConfig<A, F, C> {
    /// Create new `MapConfig` combinator
    pub(crate) fn new(a: A, f: F) -> Self
    where
        A: ServiceFactory,
        F: Fn(C) -> A::Config,
    {
        Self {
            a,
            f,
            e: PhantomData,
        }
    }
}

impl<A, F, C> Clone for MapConfig<A, F, C>
where
    A: Clone,
    F: Clone,
{
    fn clone(&self) -> Self {
        Self {
            a: self.a.clone(),
            f: self.f.clone(),
            e: PhantomData,
        }
    }
}

impl<A, F, C> ServiceFactory for MapConfig<A, F, C>
where
    A: ServiceFactory,
    F: Fn(C) -> A::Config,
{
    type Request = A::Request;
    type Response = A::Response;
    type Error = A::Error;

    type Config = C;
    type Service = A::Service;
    type InitError = A::InitError;
    type Future = A::Future;

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

/// `unit_config()` config combinator
pub struct UnitConfig<A, C> {
    a: A,
    e: PhantomData<C>,
}

impl<A, C> UnitConfig<A, C>
where
    A: ServiceFactory<Config = ()>,
{
    /// Create new `UnitConfig` combinator
    pub(crate) fn new(a: A) -> Self {
        Self { a, e: PhantomData }
    }
}

impl<A, C> Clone for UnitConfig<A, C>
where
    A: Clone,
{
    fn clone(&self) -> Self {
        Self {
            a: self.a.clone(),
            e: PhantomData,
        }
    }
}

impl<A, C> ServiceFactory for UnitConfig<A, C>
where
    A: ServiceFactory<Config = ()>,
{
    type Request = A::Request;
    type Response = A::Response;
    type Error = A::Error;

    type Config = C;
    type Service = A::Service;
    type InitError = A::InitError;
    type Future = A::Future;

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