use crate::base::{DataValueRaw, ErrorCode, HasErrorCode};
use crate::{
error, DataValueReaderExt, DataValueWriterExt, Endian,
ErrorCodeReaderExt, ErrorCodeWriterExt, HasFixedCommandId, IsRequest,
IsResponse, IsValidResponseFor, MessageExt, ReadExt, ReadFromPayload,
Result, TryFromResponse, WithFixedPayloadLength, WriteExt,
};
use std::io::{Read, Write};
#[derive(Clone, Debug, PartialEq)]
pub struct Request {
pub module_id: u16,
pub channel_index: u16,
}
impl IsRequest for Request {
type Response = Response;
}
impl From<Request> for super::Request {
fn from(m: Request) -> Self {
super::Request::ReadValueFromModuleChannel(m)
}
}
impl WithFixedPayloadLength for Request {
const FIXED_PAYLOAD_LENGTH: u16 =
u16::FIXED_PAYLOAD_LENGTH + u16::FIXED_PAYLOAD_LENGTH;
}
impl HasFixedCommandId for Request {
const COMMAND_ID: u16 = 0x380a;
}
impl MessageExt for Request {
fn payload_length(&self) -> u16 {
Self::FIXED_PAYLOAD_LENGTH
}
fn write_payload(&self, w: &mut dyn Write) -> Result<()> {
w.write_u16::<Endian>(self.module_id)?;
w.write_u16::<Endian>(self.channel_index)?;
Ok(())
}
}
impl ReadFromPayload for Request {
fn read_from_payload<R: Read>(
r: &mut R,
payload_length: u16,
) -> Result<Self> {
Self::verify_payload_length(
payload_length,
"read_value_from_module_channel_request",
)?;
let module_id = r.read_u16::<Endian>()?;
let channel_index = r.read_u16::<Endian>()?;
Ok(Self {
module_id,
channel_index,
})
}
}
#[cfg(test)]
mod test_request {
use super::*;
#[test]
fn write_to() {
let mut buffer = Vec::new();
let options: u8 = 0x45;
let sequence: u8 = 0x93;
let message = Request {
module_id: 0x1122,
channel_index: 0x3344,
};
message.write_to(&mut buffer, options, sequence).unwrap();
assert_eq!(
buffer,
[
0x45,
0x93,
0x0a,
0x38,
0x04,
0x00,
0x22,
0x11,
0x44,
0x33,
]
);
}
#[test]
fn read_from_payload() {
let buffer = vec![
0x22,
0x11,
0x44,
0x33,
];
let len = buffer.len() as u16;
let message =
Request::read_from_payload(&mut buffer.as_slice(), len)
.unwrap();
assert_eq!(
message,
Request {
module_id: 0x1122,
channel_index: 0x3344,
}
);
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct Response {
pub error: ErrorCode,
pub value: DataValueRaw,
}
impl IsResponse for Response {
type Request = Request;
}
impl IsValidResponseFor for Response {
fn is_valid_response_for(&self, _request: &Request) -> bool {
true
}
}
impl HasErrorCode for Response {
fn error_code(&self) -> ErrorCode {
self.error
}
}
impl TryFromResponse for Response {
fn try_from_response(r: super::Response) -> Result<Self> {
if let super::Response::ReadValueFromModuleChannel(r) = r {
Ok(r)
} else {
error::UnexpectedResponseType.fail()
}
}
}
impl From<Response> for super::Response {
fn from(m: Response) -> Self {
super::Response::ReadValueFromModuleChannel(m)
}
}
impl WithFixedPayloadLength for Response {
const FIXED_PAYLOAD_LENGTH: u16 = ErrorCode::FIXED_PAYLOAD_LENGTH
+ DataValueRaw::FIXED_PAYLOAD_LENGTH;
}
impl HasFixedCommandId for Response {
const COMMAND_ID: u16 = 0x380b;
}
impl MessageExt for Response {
fn payload_length(&self) -> u16 {
Self::FIXED_PAYLOAD_LENGTH
}
fn write_payload(&self, w: &mut dyn Write) -> Result<()> {
w.write_error_code(self.error)?;
w.write_data_value(&self.value)?;
Ok(())
}
}
impl ReadFromPayload for Response {
fn read_from_payload<R: Read>(
r: &mut R,
payload_length: u16,
) -> Result<Self> {
Self::verify_payload_length(
payload_length,
"read_value_from_module_channel_repsonse",
)?;
let error = r.read_error_code()?;
let value = r.read_data_value()?;
Ok(Self { error, value })
}
}
#[cfg(test)]
mod test_response {
use super::*;
#[test]
fn write_to() {
let mut buffer = Vec::new();
let options: u8 = 0x45;
let sequence: u8 = 0x93;
let message = Response {
error: ErrorCode::InvalidState,
value: 0x6543u16.into(),
};
message.write_to(&mut buffer, options, sequence).unwrap();
assert_eq!(
buffer,
[
0x45,
0x93,
0x0b,
0x38,
0x0B,
0x00,
0x07,
0x01,
0x06,
0x43,
0x65,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
]
);
}
#[test]
fn read_from_payload() {
let buffer = vec![
0x07,
0x01,
0x06,
0x43,
0x65,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
];
let len = buffer.len() as u16;
let message =
Response::read_from_payload(&mut buffer.as_slice(), len)
.unwrap();
assert_eq!(
message,
Response {
error: ErrorCode::InvalidState,
value: 0x6543u16.into(),
}
);
}
}