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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
use std::borrow::Cow;
use std::str;
use bytes::{Bytes, BytesMut};
use encoding_rs::{Encoding, UTF_8};
use futures::{Async, Poll, Stream};
use crate::dev::Payload;
use crate::error::{PayloadError, ReadlinesError};
use crate::HttpMessage;
pub struct Readlines<T: HttpMessage> {
stream: Payload<T::Stream>,
buff: BytesMut,
limit: usize,
checked_buff: bool,
encoding: &'static Encoding,
err: Option<ReadlinesError>,
}
impl<T> Readlines<T>
where
T: HttpMessage,
T::Stream: Stream<Item = Bytes, Error = PayloadError>,
{
pub fn new(req: &mut T) -> Self {
let encoding = match req.encoding() {
Ok(enc) => enc,
Err(err) => return Self::err(err.into()),
};
Readlines {
stream: req.take_payload(),
buff: BytesMut::with_capacity(262_144),
limit: 262_144,
checked_buff: true,
err: None,
encoding,
}
}
pub fn limit(mut self, limit: usize) -> Self {
self.limit = limit;
self
}
fn err(err: ReadlinesError) -> Self {
Readlines {
stream: Payload::None,
buff: BytesMut::new(),
limit: 262_144,
checked_buff: true,
encoding: UTF_8,
err: Some(err),
}
}
}
impl<T> Stream for Readlines<T>
where
T: HttpMessage,
T::Stream: Stream<Item = Bytes, Error = PayloadError>,
{
type Item = String;
type Error = ReadlinesError;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
if let Some(err) = self.err.take() {
return Err(err);
}
if !self.checked_buff {
let mut found: Option<usize> = None;
for (ind, b) in self.buff.iter().enumerate() {
if *b == b'\n' {
found = Some(ind);
break;
}
}
if let Some(ind) = found {
if ind + 1 > self.limit {
return Err(ReadlinesError::LimitOverflow);
}
let line = if self.encoding == UTF_8 {
str::from_utf8(&self.buff.split_to(ind + 1))
.map_err(|_| ReadlinesError::EncodingError)?
.to_owned()
} else {
self.encoding
.decode_without_bom_handling_and_without_replacement(
&self.buff.split_to(ind + 1),
)
.map(Cow::into_owned)
.ok_or(ReadlinesError::EncodingError)?
};
return Ok(Async::Ready(Some(line)));
}
self.checked_buff = true;
}
match self.stream.poll() {
Ok(Async::Ready(Some(mut bytes))) => {
let mut found: Option<usize> = None;
for (ind, b) in bytes.iter().enumerate() {
if *b == b'\n' {
found = Some(ind);
break;
}
}
if let Some(ind) = found {
if ind + 1 > self.limit {
return Err(ReadlinesError::LimitOverflow);
}
let line = if self.encoding == UTF_8 {
str::from_utf8(&bytes.split_to(ind + 1))
.map_err(|_| ReadlinesError::EncodingError)?
.to_owned()
} else {
self.encoding
.decode_without_bom_handling_and_without_replacement(
&bytes.split_to(ind + 1),
)
.map(Cow::into_owned)
.ok_or(ReadlinesError::EncodingError)?
};
self.buff.extend_from_slice(&bytes);
self.checked_buff = false;
return Ok(Async::Ready(Some(line)));
}
self.buff.extend_from_slice(&bytes);
Ok(Async::NotReady)
}
Ok(Async::NotReady) => Ok(Async::NotReady),
Ok(Async::Ready(None)) => {
if self.buff.is_empty() {
return Ok(Async::Ready(None));
}
if self.buff.len() > self.limit {
return Err(ReadlinesError::LimitOverflow);
}
let line = if self.encoding == UTF_8 {
str::from_utf8(&self.buff)
.map_err(|_| ReadlinesError::EncodingError)?
.to_owned()
} else {
self.encoding
.decode_without_bom_handling_and_without_replacement(&self.buff)
.map(Cow::into_owned)
.ok_or(ReadlinesError::EncodingError)?
};
self.buff.clear();
Ok(Async::Ready(Some(line)))
}
Err(e) => Err(ReadlinesError::from(e)),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test::{block_on, TestRequest};
#[test]
fn test_readlines() {
let mut req = TestRequest::default()
.set_payload(Bytes::from_static(
b"Lorem Ipsum is simply dummy text of the printing and typesetting\n\
industry. Lorem Ipsum has been the industry's standard dummy\n\
Contrary to popular belief, Lorem Ipsum is not simply random text.",
))
.to_request();
let stream = match block_on(Readlines::new(&mut req).into_future()) {
Ok((Some(s), stream)) => {
assert_eq!(
s,
"Lorem Ipsum is simply dummy text of the printing and typesetting\n"
);
stream
}
_ => unreachable!("error"),
};
let stream = match block_on(stream.into_future()) {
Ok((Some(s), stream)) => {
assert_eq!(
s,
"industry. Lorem Ipsum has been the industry's standard dummy\n"
);
stream
}
_ => unreachable!("error"),
};
match block_on(stream.into_future()) {
Ok((Some(s), _)) => {
assert_eq!(
s,
"Contrary to popular belief, Lorem Ipsum is not simply random text."
);
}
_ => unreachable!("error"),
}
}
}