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
use std::sync::Arc;
use crate::{Client, Request, Response, Result};
mod logger;
mod redirect;
pub use logger::Logger;
pub use redirect::Redirect;
use async_trait::async_trait;
use futures_util::future::BoxFuture;
#[async_trait]
pub trait Middleware: 'static + Send + Sync {
async fn handle(&self, req: Request, client: Client, next: Next<'_>) -> Result<Response>;
}
#[async_trait]
impl<F> Middleware for F
where
F: Send
+ Sync
+ 'static
+ for<'a> Fn(Request, Client, Next<'a>) -> BoxFuture<'a, Result<Response>>,
{
async fn handle(&self, req: Request, client: Client, next: Next<'_>) -> Result<Response> {
(self)(req, client, next).await
}
}
#[allow(missing_debug_implementations)]
pub struct Next<'a> {
next_middleware: &'a [Arc<dyn Middleware>],
endpoint: &'a (dyn (Fn(Request, Client) -> BoxFuture<'static, Result<Response>>)
+ Send
+ Sync
+ 'static),
}
impl Clone for Next<'_> {
fn clone(&self) -> Self {
Self {
next_middleware: self.next_middleware,
endpoint: self.endpoint,
}
}
}
impl Copy for Next<'_> {}
impl<'a> Next<'a> {
pub fn new(
next: &'a [Arc<dyn Middleware>],
endpoint: &'a (dyn (Fn(Request, Client) -> BoxFuture<'static, Result<Response>>)
+ Send
+ Sync
+ 'static),
) -> Self {
Self {
endpoint,
next_middleware: next,
}
}
pub fn run(mut self, req: Request, client: Client) -> BoxFuture<'a, Result<Response>> {
if let Some((current, next)) = self.next_middleware.split_first() {
self.next_middleware = next;
current.handle(req, client, self)
} else {
(self.endpoint)(req, client)
}
}
}