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

use std::{
    fmt, mem,
    pin::Pin,
    task::{Context, Poll},
};

use bytes::{Bytes, BytesMut};
use futures_core::Stream;

use crate::error::Error;

use super::{BodySize, BodyStream, MessageBody, SizedStream};

/// Represents various types of HTTP message body.
pub enum Body {
    /// Empty response. `Content-Length` header is not set.
    None,
    /// Zero sized response body. `Content-Length` header is set to `0`.
    Empty,
    /// Specific response body.
    Bytes(Bytes),
    /// Generic message body.
    Message(Box<dyn MessageBody + Unpin>),
}

impl Body {
    /// Create body from slice (copy)
    pub fn from_slice(s: &[u8]) -> Body {
        Body::Bytes(Bytes::copy_from_slice(s))
    }

    /// Create body from generic message body.
    pub fn from_message<B: MessageBody + Unpin + 'static>(body: B) -> Body {
        Body::Message(Box::new(body))
    }
}

impl MessageBody for Body {
    fn size(&self) -> BodySize {
        match self {
            Body::None => BodySize::None,
            Body::Empty => BodySize::Empty,
            Body::Bytes(ref bin) => BodySize::Sized(bin.len() as u64),
            Body::Message(ref body) => body.size(),
        }
    }

    fn poll_next(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Result<Bytes, Error>>> {
        match self.get_mut() {
            Body::None => Poll::Ready(None),
            Body::Empty => Poll::Ready(None),
            Body::Bytes(ref mut bin) => {
                let len = bin.len();
                if len == 0 {
                    Poll::Ready(None)
                } else {
                    Poll::Ready(Some(Ok(mem::take(bin))))
                }
            }
            Body::Message(body) => Pin::new(&mut **body).poll_next(cx),
        }
    }
}

impl PartialEq for Body {
    fn eq(&self, other: &Body) -> bool {
        match *self {
            Body::None => matches!(*other, Body::None),
            Body::Empty => matches!(*other, Body::Empty),
            Body::Bytes(ref b) => match *other {
                Body::Bytes(ref b2) => b == b2,
                _ => false,
            },
            Body::Message(_) => false,
        }
    }
}

impl fmt::Debug for Body {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match *self {
            Body::None => write!(f, "Body::None"),
            Body::Empty => write!(f, "Body::Empty"),
            Body::Bytes(ref b) => write!(f, "Body::Bytes({:?})", b),
            Body::Message(_) => write!(f, "Body::Message(_)"),
        }
    }
}

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

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

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

impl From<String> for Body {
    fn from(s: String) -> Body {
        s.into_bytes().into()
    }
}

impl<'a> From<&'a String> for Body {
    fn from(s: &'a String) -> Body {
        Body::Bytes(Bytes::copy_from_slice(AsRef::<[u8]>::as_ref(&s)))
    }
}

impl From<Bytes> for Body {
    fn from(s: Bytes) -> Body {
        Body::Bytes(s)
    }
}

impl From<BytesMut> for Body {
    fn from(s: BytesMut) -> Body {
        Body::Bytes(s.freeze())
    }
}

impl From<serde_json::Value> for Body {
    fn from(v: serde_json::Value) -> Body {
        Body::Bytes(v.to_string().into())
    }
}

impl<S> From<SizedStream<S>> for Body
where
    S: Stream<Item = Result<Bytes, Error>> + Unpin + 'static,
{
    fn from(s: SizedStream<S>) -> Body {
        Body::from_message(s)
    }
}

impl<S, E> From<BodyStream<S>> for Body
where
    S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
    E: Into<Error> + 'static,
{
    fn from(s: BodyStream<S>) -> Body {
        Body::from_message(s)
    }
}