File size: 4,791 Bytes
afa0cbf | 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 | use anyhow::Context;
use anyhow::Result;
use std::io;
use std::io::Read;
use std::io::Write;
use std::net::TcpListener;
use std::net::TcpStream;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering;
use std::thread;
use std::thread::JoinHandle;
use std::time::Duration;
pub(super) struct LoopbackResponsesServer {
base_url: String,
shutdown: Arc<AtomicBool>,
thread: Option<JoinHandle<()>>,
}
impl LoopbackResponsesServer {
pub(super) fn start() -> Result<Self> {
let listener =
TcpListener::bind("127.0.0.1:0").context("bind loopback Responses API server")?;
listener
.set_nonblocking(true)
.context("set loopback Responses API server nonblocking")?;
let address = listener.local_addr()?;
let shutdown = Arc::new(AtomicBool::new(false));
let thread_shutdown = Arc::clone(&shutdown);
let thread = thread::spawn(move || {
while !thread_shutdown.load(Ordering::Relaxed) {
match listener.accept() {
Ok((stream, _)) => {
if let Err(err) = handle_model_connection(stream) {
eprintln!("loopback Responses API server error: {err}");
}
}
Err(err) if err.kind() == io::ErrorKind::WouldBlock => {
thread::sleep(Duration::from_millis(10));
}
Err(err) => {
eprintln!("loopback Responses API accept error: {err}");
break;
}
}
}
});
Ok(Self {
base_url: format!("http://{address}"),
shutdown,
thread: Some(thread),
})
}
pub(super) fn base_url(&self) -> &str {
&self.base_url
}
}
impl Drop for LoopbackResponsesServer {
fn drop(&mut self) {
self.shutdown.store(true, Ordering::Relaxed);
if let Some(thread) = self.thread.take() {
let _ = thread.join();
}
}
}
fn handle_model_connection(mut stream: TcpStream) -> io::Result<()> {
stream.set_nonblocking(false)?;
stream.set_read_timeout(Some(Duration::from_secs(2)))?;
let request = read_http_request(&mut stream)?;
let request_line = request
.split(|byte| *byte == b'\n')
.next()
.and_then(|line| std::str::from_utf8(line).ok())
.unwrap_or_default();
if request_line.starts_with("POST ") && request_line.contains("/responses ") {
let body = concat!(
"event: response.created\n",
"data: {\"type\":\"response.created\",\"response\":{\"id\":\"resp-plugin-analytics\"}}\n\n",
"event: response.completed\n",
"data: {\"type\":\"response.completed\",\"response\":{\"id\":\"resp-plugin-analytics\",\"usage\":{\"input_tokens\":0,\"input_tokens_details\":null,\"output_tokens\":0,\"output_tokens_details\":null,\"total_tokens\":0}}}\n\n"
);
write_http_response(&mut stream, "200 OK", "text/event-stream", body)
} else {
write_http_response(
&mut stream,
"404 Not Found",
"application/json",
r#"{"error":"not found"}"#,
)
}
}
fn read_http_request(stream: &mut TcpStream) -> io::Result<Vec<u8>> {
let mut request = Vec::new();
let mut buffer = [0_u8; 4096];
let header_end = loop {
let read = stream.read(&mut buffer)?;
if read == 0 {
return Ok(request);
}
request.extend_from_slice(&buffer[..read]);
if let Some(position) = request.windows(4).position(|window| window == b"\r\n\r\n") {
break position + 4;
}
};
let content_length = parse_content_length(&request[..header_end]);
while request.len() < header_end + content_length {
let read = stream.read(&mut buffer)?;
if read == 0 {
break;
}
request.extend_from_slice(&buffer[..read]);
}
Ok(request)
}
fn parse_content_length(headers: &[u8]) -> usize {
String::from_utf8_lossy(headers)
.lines()
.find_map(|line| {
let (name, value) = line.split_once(':')?;
name.eq_ignore_ascii_case("content-length")
.then(|| value.trim().parse().ok())
.flatten()
})
.unwrap_or(0)
}
fn write_http_response(
stream: &mut TcpStream,
status: &str,
content_type: &str,
body: &str,
) -> io::Result<()> {
write!(
stream,
"HTTP/1.1 {status}\r\nContent-Type: {content_type}\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{body}",
body.len()
)?;
stream.flush()
}
|