topcoat-router 0.2.0

A modular, batteries-included Rust web framework for server-rendered apps.
Documentation 
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

use std::convert::Infallible;
use std::pin::Pin;
use std::task::{Context, Poll};

use bytes::Bytes;
use http_body::{Frame, SizeHint};
use http_body_util::combinators::UnsyncBoxBody;
use http_body_util::{BodyExt, BodyStream, Empty, Full, Limited};

/// A boxed error type used by the response body machinery.
pub type BoxError = Box<dyn std::error::Error + Send + Sync>;

/// The HTTP body type used for both requests and responses.
#[must_use]
pub struct Body(UnsyncBoxBody<Bytes, BoxError>);

impl Body {
    /// Creates an empty body.
    pub fn empty() -> Self {
        Self::from(Bytes::new())
    }

    /// Wraps any [`http_body::Body`] that yields [`Bytes`].
    pub fn new<B>(body: B) -> Self
    where
        B: http_body::Body<Data = Bytes> + Send + 'static,
        B::Error: Into<BoxError>,
    {
        Self(body.map_err(Into::into).boxed_unsync())
    }

    /// Consumes the body, returning a [`Stream`](futures_core::Stream) of its
    /// data frames.
    pub fn into_data_stream(self) -> BodyDataStream {
        BodyDataStream(BodyStream::new(self))
    }
}

impl Default for Body {
    fn default() -> Self {
        Self::empty()
    }
}

impl From<Bytes> for Body {
    fn from(bytes: Bytes) -> Self {
        Self(
            Full::new(bytes)
                .map_err(|never: Infallible| match never {})
                .boxed_unsync(),
        )
    }
}

impl From<()> for Body {
    fn from((): ()) -> Self {
        Self(
            Empty::new()
                .map_err(|never: Infallible| match never {})
                .boxed_unsync(),
        )
    }
}

impl From<Vec<u8>> for Body {
    fn from(value: Vec<u8>) -> Self {
        Self::from(Bytes::from(value))
    }
}

impl From<&'static [u8]> for Body {
    fn from(value: &'static [u8]) -> Self {
        Self::from(Bytes::from_static(value))
    }
}

impl From<String> for Body {
    fn from(value: String) -> Self {
        Self::from(Bytes::from(value))
    }
}

impl From<&'static str> for Body {
    fn from(value: &'static str) -> Self {
        Self::from(Bytes::from_static(value.as_bytes()))
    }
}

impl http_body::Body for Body {
    type Data = Bytes;
    type Error = BoxError;

    fn poll_frame(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
        Pin::new(&mut self.0).poll_frame(cx)
    }

    fn size_hint(&self) -> SizeHint {
        self.0.size_hint()
    }

    fn is_end_stream(&self) -> bool {
        self.0.is_end_stream()
    }
}

impl std::fmt::Debug for Body {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Body").finish_non_exhaustive()
    }
}

/// A [`Stream`](futures_core::Stream) over the data frames of a [`Body`],
/// yielding the raw [`Bytes`] of each frame.
#[must_use]
pub struct BodyDataStream(BodyStream<Body>);

impl futures_core::Stream for BodyDataStream {
    type Item = Result<Bytes, BoxError>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        loop {
            return match Pin::new(&mut self.0).poll_next(cx) {
                Poll::Ready(Some(Ok(frame))) => match frame.into_data() {
                    Ok(data) => Poll::Ready(Some(Ok(data))),
                    Err(_frame) => continue,
                },
                Poll::Ready(Some(Err(error))) => Poll::Ready(Some(Err(error))),
                Poll::Ready(None) => Poll::Ready(None),
                Poll::Pending => Poll::Pending,
            };
        }
    }
}

/// Collects an entire [`Body`] into [`Bytes`], failing if it exceeds `limit`.
///
/// Pass [`usize::MAX`] to read the body without enforcing a limit.
///
/// # Errors
///
/// Returns an error if reading the body fails or if it exceeds `limit` bytes.
pub async fn to_bytes(body: Body, limit: usize) -> Result<Bytes, BoxError> {
    if limit == usize::MAX {
        Ok(body.collect().await?.to_bytes())
    } else {
        Ok(Limited::new(body, limit).collect().await?.to_bytes())
    }
}