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use Error;
use wire::pretty_print::{PrettyPrint, PrettyPrinter};
use super::Device;
pub struct Tracer<T: Device, U: PrettyPrint> {
lower: T,
writer: fn(PrettyPrinter<U>)
}
impl<T: Device, U: PrettyPrint> Tracer<T, U> {
pub fn new(lower: T, writer: fn(PrettyPrinter<U>)) -> Tracer<T, U> {
Tracer {
lower: lower,
writer: writer
}
}
#[cfg(feature = "use_std")]
pub fn new_stdout(lower: T) -> Tracer<T, U> {
fn writer<U: PrettyPrint>(printer: PrettyPrinter<U>) {
print!("{}", printer)
}
Tracer {
lower: lower,
writer: writer
}
}
pub fn into_lower(self) -> T {
self.lower
}
}
impl<T: Device, U: PrettyPrint> Device for Tracer<T, U> {
type RxBuffer = T::RxBuffer;
type TxBuffer = TxBuffer<T::TxBuffer, U>;
fn mtu(&self) -> usize { self.lower.mtu() }
fn receive(&mut self) -> Result<Self::RxBuffer, Error> {
let buffer = try!(self.lower.receive());
(self.writer)(PrettyPrinter::<U>::new("<- ", &buffer));
Ok(buffer)
}
fn transmit(&mut self, length: usize) -> Result<Self::TxBuffer, Error> {
let buffer = try!(self.lower.transmit(length));
Ok(TxBuffer {
buffer: buffer,
writer: self.writer
})
}
}
#[doc(hidden)]
pub struct TxBuffer<T: AsRef<[u8]>, U: PrettyPrint> {
buffer: T,
writer: fn(PrettyPrinter<U>)
}
impl<T: AsRef<[u8]>, U: PrettyPrint> AsRef<[u8]>
for TxBuffer<T, U> {
fn as_ref(&self) -> &[u8] { self.buffer.as_ref() }
}
impl<T: AsRef<[u8]> + AsMut<[u8]>, U: PrettyPrint> AsMut<[u8]>
for TxBuffer<T, U> {
fn as_mut(&mut self) -> &mut [u8] { self.buffer.as_mut() }
}
impl<T: AsRef<[u8]>, U: PrettyPrint> Drop for TxBuffer<T, U> {
fn drop(&mut self) {
(self.writer)(PrettyPrinter::<U>::new("-> ", &self.buffer));
}
}