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pub mod builder;
pub mod processor;
use crate::secure::CryptoError;
use std::{fmt::Display, string::FromUtf8Error, io::{self, Read, Write}, str::Utf8Error};
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Copy, Clone, PartialEq, Eq, Debug)]
pub struct Header {
pub id: i32,
pub status: i16,
pub name: [u8; 11],
pub data_type: i8,
pub data_size: i32
}
impl Header {
pub fn name(&self) -> Result<String, FromUtf8Error> {
let size = self.name.iter().position(|&c| c == b'\0').unwrap_or(11);
String::from_utf8(self.name[..size].into())
}
pub fn set_name(&mut self, name: &str) {
self.name = Self::to_name(name);
}
pub fn to_name(name: &str) -> [u8; 11] {
let bytes = name.as_bytes();
let mut name = [0_u8; 11];
name[..bytes.len().min(11)].copy_from_slice(bytes);
name
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Command {
pub header: Header,
pub data: Vec<u8>,
}
pub trait CommandData: Sized {
fn method(&self) -> &'static str;
fn encode(&self) -> Result<Vec<u8>, Error>;
fn decode(data: &Vec<u8>) -> Result<Self, Error>;
}
#[derive(Debug)]
pub enum Error {
Io(io::Error),
Marshal(bincode::Error),
Decode(String),
Encode(String),
Crypto(CryptoError)
}
impl Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{:?}", self)
}
}
impl std::error::Error for Error {
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Self {
Error::Io(err)
}
}
impl From<bincode::Error> for Error {
fn from(err: bincode::Error) -> Self {
Error::Marshal(err)
}
}
impl From<CryptoError> for Error {
fn from(err: CryptoError) -> Self {
Error::Crypto(err)
}
}
impl From<Utf8Error> for Error {
fn from(err: Utf8Error) -> Self {
Error::Decode(err.to_string()).into()
}
}
impl From<Error> for io::Error {
fn from(err: Error) -> Self {
io::Error::new(io::ErrorKind::InvalidData, format!("Command Error: {:?}", err))
}
}
pub trait ReadHeader {
fn read_header(&mut self) -> Result<Header, Error>;
}
impl<T: Read> ReadHeader for T {
fn read_header(&mut self) -> Result<Header, Error> {
let mut buf = [0_u8; 22];
self.read_exact(&mut buf)?;
let header = bincode::deserialize::<Header>(&buf)?;
Ok(header)
}
}
pub trait WriteHeader {
fn write_header(&mut self, header: Header) -> Result<usize, Error>;
}
impl<T: Write> WriteHeader for T {
fn write_header(&mut self, header: Header) -> Result<usize, Error> {
let buf = bincode::serialize(&header)?;
self.write_all(&buf)?;
Ok(buf.len())
}
}
pub trait ReadCommand {
fn read_command(&mut self) -> Result<Command, Error>;
}
impl<T: ReadHeader + Read> ReadCommand for T {
fn read_command(&mut self) -> Result<Command, Error> {
let header_read = self.read_header();
if header_read.is_err() {
return Err(header_read.err().unwrap());
}
let header = header_read.ok().unwrap();
let mut data_buf = Vec::with_capacity(header.data_size as usize);
let read = self.read_exact(&mut data_buf);
if read.is_err() {
return Err(read.err().unwrap().into());
}
Ok(Command {
header,
data: data_buf
})
}
}
pub trait WriteCommand {
fn write_command(&mut self, command: Command) -> Result<usize, Error>;
}
impl<T: Write + WriteHeader> WriteCommand for T {
fn write_command(&mut self, command: Command) -> Result<usize, Error> {
let header_written = self.write_header(command.header)?;
self.write_all(&command.data)?;
Ok(header_written + command.data.len())
}
}