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use std::io::{BufRead, Read as _};
use http::{request::Parts as RequestParts, HeaderMap, HeaderValue, Method, Request, Uri, Version};
use crate::head_parser::{HeadParseConfig, HeadParseError, HeadParseOutput, HeadParser};
#[derive(Default)]
pub struct RequestHeadParser {
pub method: Method,
pub uri: Uri,
pub http_version: Version,
pub headers: HeaderMap<HeaderValue>,
config: HeadParseConfig,
state: State,
buf: Vec<u8>,
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
enum State {
Idle,
MethodParsed,
UriParsed,
HttpVersionParsed,
HeadersParsing,
}
impl Default for State {
fn default() -> Self {
Self::Idle
}
}
impl RequestHeadParser {
pub fn to_request_parts(&self) -> RequestParts {
let (mut parts, _) = Request::new(()).into_parts();
parts.method = self.method.to_owned();
parts.uri = self.uri.to_owned();
parts.version = self.http_version;
parts.headers = self.headers.to_owned();
parts
}
pub fn to_request<B>(&self, body: B) -> Request<B> {
let parts = self.to_request_parts();
Request::from_parts(parts, body)
}
}
impl HeadParser for RequestHeadParser {
fn new() -> Self {
Self::default()
}
fn with_config(config: HeadParseConfig) -> Self {
let buf = Vec::with_capacity(config.buf_capacity());
let headers = HeaderMap::with_capacity(config.header_map_capacity());
RequestHeadParser {
config,
buf,
headers,
..Default::default()
}
}
fn get_headers(&self) -> &HeaderMap<HeaderValue> {
&self.headers
}
fn get_version(&self) -> &Version {
&self.http_version
}
fn parse<R: BufRead>(&mut self, r: &mut R) -> Result<HeadParseOutput, HeadParseError> {
let mut take = r.take(0);
let mut parsed_num_bytes = 0_usize;
if self.state < State::MethodParsed {
self.buf.clear();
match Self::parse_method(&mut take, &mut self.buf, &self.config)? {
Some((method, n)) => {
self.state = State::MethodParsed;
self.method = method;
parsed_num_bytes += n;
}
None => return Ok(HeadParseOutput::Partial(parsed_num_bytes)),
}
}
if self.state < State::UriParsed {
self.buf.clear();
match Self::parse_uri(&mut take, &mut self.buf, &self.config)? {
Some((uri, n)) => {
self.state = State::UriParsed;
self.uri = uri;
parsed_num_bytes += n;
}
None => return Ok(HeadParseOutput::Partial(parsed_num_bytes)),
}
}
if self.state < State::HttpVersionParsed {
self.buf.clear();
match Self::parse_http_version_for_request(&mut take, &mut self.buf)? {
Some((http_version, n)) => {
self.state = State::HttpVersionParsed;
self.http_version = http_version;
parsed_num_bytes += n;
}
None => return Ok(HeadParseOutput::Partial(parsed_num_bytes)),
}
}
if self.state < State::HeadersParsing {
self.headers.clear();
}
loop {
if self.state <= State::HeadersParsing {
self.buf.clear();
match Self::parse_header(&mut take, &mut self.buf, &self.config, &mut self.headers)?
{
Some((is_all_completed, n)) => {
parsed_num_bytes += n;
if is_all_completed {
self.state = State::Idle;
return Ok(HeadParseOutput::Completed(parsed_num_bytes));
} else {
self.state = State::HeadersParsing;
continue;
}
}
None => return Ok(HeadParseOutput::Partial(parsed_num_bytes)),
}
} else {
unreachable!()
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_to_request() {
let p = RequestHeadParser {
method: Method::POST,
uri: Uri::try_from("/path").unwrap(),
http_version: Version::HTTP_2,
headers: {
let mut h = HeaderMap::new();
h.insert("x-foo", "bar".parse().unwrap());
h
},
..Default::default()
};
let req = p.to_request("body");
assert_eq!(req.method(), Method::POST);
assert_eq!(req.uri(), &Uri::try_from("/path").unwrap());
assert_eq!(req.version(), Version::HTTP_2);
assert_eq!(req.headers().get("x-foo").unwrap(), "bar");
assert_eq!(req.body(), &"body");
}
}