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#![cfg(feature = "std")]
#[macro_use]
extern crate criterion;
#[macro_use]
extern crate combine;
use std::fmt;
use {
combine::{
many, many1,
parser::range::{range, take_while1},
stream::easy,
token, ParseError, Parser, RangeStream,
},
criterion::{black_box, Bencher, Criterion},
};
#[allow(dead_code)]
#[derive(Debug)]
struct Request<'a> {
method: &'a [u8],
uri: &'a [u8],
version: &'a [u8],
}
#[allow(dead_code)]
#[derive(Debug)]
struct Header<'a> {
name: &'a [u8],
value: Vec<&'a [u8]>,
}
fn is_token(c: u8) -> bool {
!matches!(
c,
128..=255
| 0..=31
| b'('
| b')'
| b'<'
| b'>'
| b'@'
| b','
| b';'
| b':'
| b'\\'
| b'"'
| b'/'
| b'['
| b']'
| b'?'
| b'='
| b'{'
| b'}'
| b' '
)
}
fn is_horizontal_space(c: u8) -> bool {
c == b' ' || c == b'\t'
}
fn is_space(c: u8) -> bool {
c == b' '
}
fn is_not_space(c: u8) -> bool {
c != b' '
}
fn is_http_version(c: u8) -> bool {
(b'0'..=b'9').contains(&c) || c == b'.'
}
fn end_of_line<'a, Input>() -> impl Parser<Input, Output = u8>
where
Input: RangeStream<Token = u8, Range = &'a [u8]>,
Input::Error: ParseError<Input::Token, Input::Range, Input::Position>,
{
(token(b'\r'), token(b'\n')).map(|_| b'\r').or(token(b'\n'))
}
fn message_header<'a, Input>() -> impl Parser<Input, Output = Header<'a>>
where
Input: RangeStream<Token = u8, Range = &'a [u8]>,
Input::Error: ParseError<Input::Token, Input::Range, Input::Position>,
{
let message_header_line = (
take_while1(is_horizontal_space),
take_while1(|c| c != b'\r' && c != b'\n'),
end_of_line(),
)
.map(|(_, line, _)| line);
struct_parser!(Header {
name: take_while1(is_token),
_: token(b':'),
value: many1(message_header_line),
})
}
type HttpRequest<'a> = (Request<'a>, Vec<Header<'a>>);
fn parse_http_request<'a, Input>(input: Input) -> Result<(HttpRequest<'a>, Input), Input::Error>
where
Input: RangeStream<Token = u8, Range = &'a [u8]>,
Input::Error: ParseError<Input::Token, Input::Range, Input::Position>,
{
let http_version = range(&b"HTTP/"[..]).with(take_while1(is_http_version));
let request_line = struct_parser!(Request {
method: take_while1(is_token),
_: take_while1(is_space),
uri: take_while1(is_not_space),
_: take_while1(is_space),
version: http_version,
});
let mut request = (
request_line,
end_of_line(),
many(message_header()),
end_of_line(),
)
.map(|(request, _, headers, _)| (request, headers));
request.parse(input)
}
static REQUESTS: &[u8] = include_bytes!("http-requests.txt");
fn http_requests_small(b: &mut Bencher<'_>) {
http_requests_bench(b, easy::Stream(REQUESTS))
}
fn http_requests_large(b: &mut Bencher<'_>) {
use std::iter;
let mut buffer = Vec::with_capacity(REQUESTS.len() * 5);
for buf in iter::repeat(REQUESTS).take(5) {
buffer.extend_from_slice(buf);
}
http_requests_bench(b, easy::Stream(&buffer[..]))
}
fn http_requests_large_cheap_error(b: &mut Bencher<'_>) {
use std::iter;
let mut buffer = Vec::with_capacity(REQUESTS.len() * 5);
for buf in iter::repeat(REQUESTS).take(5) {
buffer.extend_from_slice(buf);
}
http_requests_bench(b, &buffer[..])
}
fn http_requests_bench<'a, Input>(b: &mut Bencher<'_>, buffer: Input)
where
Input: RangeStream<Token = u8, Range = &'a [u8]> + Clone,
Input::Error: ParseError<Input::Token, Input::Range, Input::Position> + fmt::Debug,
{
b.iter(|| {
let mut buf = black_box(buffer.clone());
while buf.clone().uncons().is_ok() {
match parse_http_request(buf) {
Ok(((_, _), b)) => {
buf = b;
}
Err(err) => panic!("{:?}", err),
}
}
});
}
fn http_requests(c: &mut Criterion) {
c.bench_function("http_requests_small", http_requests_small);
c.bench_function("http_requests_large", http_requests_large);
c.bench_function(
"http_requests_large_cheap_error",
http_requests_large_cheap_error,
);
}
criterion_group!(http, http_requests,);
criterion_main!(http);
|
