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use std::io::{BufRead, BufReader, Read, Write};
use super::{Error, Message};
use crate::irc::types::Message as IrcMessage;
pub trait ReadAdapter {
type Reader;
fn read_message(&mut self) -> Result<Message, Error>;
fn into_inner(self) -> Self::Reader;
}
pub trait WriteAdapter {
type Writer;
type Error;
fn write_line(&mut self, line: &[u8]) -> Result<(), Self::Error>;
fn into_inner(self) -> Self::Writer;
}
pub struct SyncReadAdapter<R> {
reader: BufReader<R>,
}
impl<R: Read> SyncReadAdapter<R> {
pub fn new(read: R) -> Self {
Self {
reader: BufReader::new(read),
}
}
}
impl<R: Read> ReadAdapter for SyncReadAdapter<R> {
type Reader = R;
fn read_message(&mut self) -> Result<Message, Error> {
let mut buf = String::new();
let len = self
.reader
.read_line(&mut buf)
.map_err(|_| Error::CannotRead)?;
if len == 0 {
return Err(Error::CannotRead);
}
let buf = buf.trim_end();
if buf.is_empty() {
return Err(Error::CannotRead);
}
log::trace!("<- {}", buf);
log::trace!("trying to parse message");
let msg = IrcMessage::parse(&buf).ok_or_else(
|| Error::InvalidMessage(buf.to_string()),
)?;
log::trace!("parsed message: {:?}", msg);
match &msg {
IrcMessage::Unknown {
prefix,
head,
args,
tail,
..
} => {
use crate::irc::types::Prefix::*;
if let (Some(Server { host }), Some(data)) = (prefix, tail) {
if head == "NOTICE"
&& host == "tmi.twitch.tv"
&& data == "Improperly formatted auth"
&& args.get(0).map(|k| k.as_str()) == Some("*")
{
log::trace!("got a registration error");
return Err(Error::InvalidRegistration);
}
}
Ok(Message::parse(msg))
}
_ => Ok(Message::Irc(Box::new(msg))),
}
}
fn into_inner(self) -> Self::Reader {
self.reader.into_inner()
}
}
pub struct SyncWriteAdapter<W> {
writer: W,
}
impl<W: Write> SyncWriteAdapter<W> {
pub fn new(writer: W) -> Self {
Self { writer }
}
}
impl<W: Write> WriteAdapter for SyncWriteAdapter<W> {
type Writer = W;
type Error = Error;
fn write_line(&mut self, line: &[u8]) -> Result<(), Self::Error> {
self.writer
.write_all(line)
.and_then(|_| self.writer.write_all(b"\r\n"))
.and_then(|_| self.writer.flush())
.map_err(Error::Write)
}
fn into_inner(self) -> Self::Writer {
self.writer
}
}
pub fn sync_adapters<R, W>(read: R, write: W) -> (SyncReadAdapter<R>, SyncWriteAdapter<W>)
where
R: Read,
W: Write,
{
(SyncReadAdapter::new(read), SyncWriteAdapter::new(write))
}