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9552aa0 | 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 | use std::pin::Pin;
use pyo3::prelude::*;
use tokio::io::{AsyncBufRead, AsyncBufReadExt, AsyncReadExt};
#[pyclass]
pub struct WsgiInputStream {
body_reader: Pin<Box<dyn AsyncBufRead + Send + Sync>>,
}
impl WsgiInputStream {
pub fn new(body_reader: impl AsyncBufRead + Send + Sync + 'static) -> Self {
Self {
body_reader: Box::pin(body_reader),
}
}
}
#[pymethods]
impl WsgiInputStream {
fn read(&mut self, size: usize) -> PyResult<Vec<u8>> {
let mut buffer = vec![0u8; size];
let read_bytes = futures_lite::future::block_on(self.body_reader.read(&mut buffer))?;
Ok(buffer[0..read_bytes].to_vec())
}
#[pyo3(signature = (size=-1))]
fn readline(&mut self, size: Option<isize>) -> PyResult<Vec<u8>> {
let mut buffer = Vec::new();
let size = if size.is_none_or(|s| s < 0) {
None
} else {
size.map(|s| s as usize)
};
loop {
let reader_buffer = futures_lite::future::block_on(self.body_reader.fill_buf())?.to_vec();
if reader_buffer.is_empty() {
break;
}
if let Some(eol_position) = reader_buffer.iter().position(|&char| char == b'\n') {
buffer.extend_from_slice(
&reader_buffer[0..size.map_or(eol_position + 1, |size| {
std::cmp::min(size, eol_position + 1)
})],
);
self.body_reader.consume(eol_position + 1);
break;
} else {
buffer.extend_from_slice(&reader_buffer[0..size.unwrap_or(reader_buffer.len())]);
self.body_reader.consume(reader_buffer.len());
}
}
Ok(buffer)
}
#[pyo3(signature = (hint=-1))]
fn readlines(&mut self, hint: Option<isize>) -> PyResult<Vec<Vec<u8>>> {
let mut total_bytes = 0;
let mut lines = Vec::new();
let hint = if hint.is_none_or(|s| s < 0) {
None
} else {
hint.map(|s| s as usize)
};
loop {
let mut line = Vec::new();
let bytes_read =
futures_lite::future::block_on(self.body_reader.read_until(b'\n', &mut line))?;
if bytes_read == 0 {
break;
}
total_bytes += line.len();
lines.push(line);
if hint.is_some_and(|hint| hint > total_bytes) {
break;
}
}
Ok(lines)
}
fn __iter__(this: PyRef<'_, Self>) -> PyRef<'_, Self> {
this
}
fn __next__(&mut self) -> PyResult<Option<Vec<u8>>> {
let line = self.readline(None)?;
if line.is_empty() {
// If a "readline()" function in WSGI input stream Python class returns 0 bytes (not even "\n"), it means EOF.
Ok(None)
} else {
Ok(Some(line))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::io::Cursor;
use tokio::io::BufReader;
fn create_stream(data: &str) -> WsgiInputStream {
let cursor = Cursor::new(data.as_bytes().to_vec());
let reader = BufReader::new(cursor);
WsgiInputStream::new(reader)
}
#[test]
fn test_read() {
let mut stream = create_stream("Hello, world!");
let result = stream.read(5).unwrap();
assert_eq!(result, b"Hello");
}
#[test]
fn test_read_full() {
let mut stream = create_stream("Hello");
let result = stream.read(10).unwrap(); // try to read more than available
assert_eq!(result, b"Hello");
}
#[test]
fn test_readline_no_limit() {
let mut stream = create_stream("line1\nline2\n");
let result = stream.readline(None).unwrap();
assert_eq!(result, b"line1\n");
let result = stream.readline(None).unwrap();
assert_eq!(result, b"line2\n");
}
#[test]
fn test_readline_with_limit() {
let mut stream = create_stream("line1\nline2\n");
let result = stream.readline(Some(3)).unwrap();
assert_eq!(result, b"lin"); // Only 3 bytes
}
#[test]
fn test_readlines_no_hint() {
let mut stream = create_stream("line1\nline2\nline3\n");
let result = stream.readlines(None).unwrap();
assert_eq!(result, vec![b"line1\n", b"line2\n", b"line3\n"]);
}
#[test]
fn test_readlines_with_hint() {
let mut stream = create_stream("line1\nline2\nline3\n");
let result = stream.readlines(Some(10)).unwrap(); // Should stop when bytes exceed 10
let total: usize = result.iter().map(|l| l.len()).sum();
assert!(total > 0 && total <= 10);
}
#[test]
fn test_iterator_behavior() {
let mut stream = create_stream("line1\nline2\n");
let mut results = Vec::new();
while let Some(line) = stream.__next__().unwrap() {
results.push(line);
}
assert_eq!(results, vec![b"line1\n", b"line2\n"]);
}
#[test]
fn test_iterator_eof() {
let mut stream = create_stream("");
let result = stream.__next__().unwrap();
assert_eq!(result, None);
}
}
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