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use super::ring_byte_buffer::RingByteBuffer;
use super::prelude::*;
use std::io;
use std::time::{ Instant, Duration };
const DEFAULT_CHANNEL_READ_BUFFER_SIZE: usize = 1024;
#[derive(Debug)]
pub struct Channel<P, T: ?Sized> {
protocol: P,
stream: Box<T>,
read_buffer: RingByteBuffer,
}
impl<P, T: ?Sized> Channel<P, T>
where
P: ProtocolDecoder + ProtocolEncoder,
T: io::Read + io::Write
{
pub fn new(protocol: P, stream: Box<T>) -> Channel<P, T> {
Channel::with_read_buffer_size(protocol, stream, DEFAULT_CHANNEL_READ_BUFFER_SIZE)
}
pub fn with_read_buffer_size(
protocol: P,
stream: Box<T>,
read_buffer_size: usize,
) -> Channel<P, T> {
let mut chn = Channel {
protocol: protocol,
stream: stream,
read_buffer: RingByteBuffer::with_capacity(read_buffer_size),
};
chn.reset();
return chn;
}
pub fn reset(&mut self) {
self.protocol.reset_encoder();
self.protocol.reset_decoder();
}
pub fn read(&mut self) -> Result<Option<Message>> {
loop {
self.read_buffer.read_from(&mut self.stream)?;
let (decoded, msg) = self
.protocol
.decode(self.read_buffer.current_read_slice())?;
self.read_buffer.skip_bytes(decoded);
if decoded == 0 {
return Ok(Option::None);
}
if let Some(_) = msg {
return Ok(msg);
}
}
}
pub fn read_until(&mut self, timeout: Duration) -> Result<Option<Message>> {
let start = Instant::now();
while Instant::now() - start < timeout {
if let Some(msg) = self.read()? {
return Ok(Some(msg));
}
}
return Err(Error::OperationFail("operation failed".to_owned()));
}
pub fn write(&mut self, msg:&Message) -> Result<usize> {
let written = self.protocol.write_to(msg, &mut self.stream)?;
self.stream.flush()?;
return Ok(written);
}
pub fn invoke(&mut self, request:&Message, timeout: Duration) -> Result<Option<Message>> {
self.write(request)?;
return self.read_until(timeout);
}
}