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use connection::{Connection,ConnectionState};
use buffer::Buffer;
use std::io::{Error,ErrorKind,Read,Result,Write};
impl Connection {
pub fn run<T>(&mut self, stream: &mut T, send_buffer: &mut Buffer, receive_buffer: &mut Buffer) -> Result<ConnectionState>
where T: Read + Write {
let mut write_would_block = false;
let mut read_would_block = false;
loop {
let continue_writing = !write_would_block && self.can_write(send_buffer);
let continue_reading = !read_would_block && self.can_read(receive_buffer);
let continue_parsing = self.can_parse(receive_buffer);
if !continue_writing && !continue_reading && !continue_parsing {
return Ok(self.state);
}
if continue_writing {
match self.write_to_stream(stream, send_buffer) {
Ok((_,_)) => {
},
Err(e) => {
match e.kind() {
ErrorKind::WouldBlock => {
write_would_block = true;
},
k => {
println!("error writing: {:?}", k);
self.state = ConnectionState::Error;
return Err(e);
}
}
}
}
}
if continue_reading {
match self.read_from_stream(stream, receive_buffer) {
Ok(_) => {},
Err(e) => {
match e.kind() {
ErrorKind::WouldBlock => {
read_would_block = true;
},
k => {
println!("error reading: {:?}", k);
self.state = ConnectionState::Error;
return Err(e);
}
}
}
}
}
if continue_parsing {
if let Ok((sz, _)) = self.parse(receive_buffer.data()) {
receive_buffer.consume(sz);
}
}
}
}
pub fn can_write(&self, send_buffer: &Buffer) -> bool {
send_buffer.available_data() > 0 || !self.frame_queue.is_empty()
}
pub fn can_read(&self, receive_buffer: &Buffer) -> bool {
receive_buffer.available_space() > 0
}
pub fn can_parse(&self, receive_buffer: &Buffer) -> bool {
receive_buffer.available_data() > 0
}
pub fn write_to_stream(&mut self, writer: &mut Write, send_buffer: &mut Buffer) -> Result<(usize, ConnectionState)> {
match self.serialize(send_buffer.space()) {
Ok((sz, _)) => {
send_buffer.fill(sz);
},
Err(e) => {
return Err(e);
}
}
match writer.write(&mut send_buffer.data()) {
Ok(sz) => {
println!("wrote {} bytes", sz);
send_buffer.consume(sz);
Ok((sz, self.state))
},
Err(e) => Err(e),
}
}
pub fn read_from_stream(&mut self, reader: &mut Read, receive_buffer: &mut Buffer) -> Result<(usize, ConnectionState)> {
if self.state == ConnectionState::Initial || self.state == ConnectionState::Error {
self.state = ConnectionState::Error;
return Err(Error::new(ErrorKind::Other, "invalid state"))
}
match reader.read(&mut receive_buffer.space()) {
Ok(sz) => {
println!("read {} bytes", sz);
receive_buffer.fill(sz);
Ok((sz, self.state))
},
Err(e) => Err(e),
}
}
}