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// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
use std::{fmt, time::Duration};
use rumqttc::QoS;
use serde::{
de::{self, Visitor},
Deserialize, Deserializer,
};
#[allow(clippy::enum_variant_names)]
#[derive(Deserialize, Debug)]
#[serde(remote = "QoS", rename_all = "kebab-case")]
#[repr(u8)]
pub enum QoSDef {
AtMostOnce = 0,
AtLeastOnce = 1,
ExactlyOnce = 2,
}
pub fn deserialize_qos_opt<'de, D>(deserializer: D) -> Result<Option<QoS>, D::Error>
where
D: Deserializer<'de>,
{
#[derive(Deserialize)]
struct Helper(#[serde(with = "QoSDef")] QoS);
let helper = Option::deserialize(deserializer)?;
Ok(helper.map(|Helper(external)| external))
}
pub fn deserialize_timeout<'de, D>(deserializer: D) -> Result<Duration, D::Error>
where
D: Deserializer<'de>,
{
struct DurationVisitor;
impl<'de> de::Visitor<'de> for DurationVisitor {
type Value = Duration;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a positive number")
}
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
where
E: de::Error,
{
if v < 0 {
return Err(de::Error::invalid_value(
de::Unexpected::Signed(v),
&"a non-negative number",
));
}
if v == 0 {
Ok(Duration::MAX)
} else {
Ok(Duration::from_secs(v as u64))
}
}
fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
where
E: de::Error,
{
if v < 0.0 {
return Err(de::Error::invalid_value(
de::Unexpected::Float(v),
&"a non-negative number",
));
}
if v == 0.0 {
Ok(Duration::MAX)
} else {
Ok(Duration::from_secs_f64(v))
}
}
}
deserializer.deserialize_any(DurationVisitor)
}
pub fn deserialize_timeout_opt<'de, D>(deserializer: D) -> Result<Option<Duration>, D::Error>
where
D: Deserializer<'de>,
{
#[derive(Deserialize)]
struct Helper(#[serde(deserialize_with = "deserialize_timeout")] Duration);
let helper = Option::deserialize(deserializer)?;
Ok(helper.map(|Helper(external)| external))
}
impl<'de> Deserialize<'de> for super::Program {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
struct VecOrProgram;
impl<'de> Visitor<'de> for VecOrProgram {
type Value = super::Program;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("map or seq")
}
fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
let vec: Box<[String]> =
Deserialize::deserialize(de::value::SeqAccessDeserializer::new(seq))?;
Ok(super::Program {
command: vec,
timeout: None,
})
}
fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
where
A: serde::de::MapAccess<'de>,
{
#[derive(Deserialize)]
struct Helper {
command: Box<[String]>,
#[serde(default, deserialize_with = "deserialize_timeout_opt")]
timeout: Option<Duration>,
}
let helper: Helper =
Deserialize::deserialize(de::value::MapAccessDeserializer::new(map))?;
Ok(super::Program {
command: helper.command,
timeout: helper.timeout,
})
}
}
deserializer.deserialize_any(VecOrProgram)
}
}
impl<'de> Deserialize<'de> for super::Route {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
struct VecOrRoute;
impl<'de> Visitor<'de> for VecOrRoute {
type Value = super::Route;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("map or seq")
}
fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
let vec: Box<[super::Program]> =
Deserialize::deserialize(de::value::SeqAccessDeserializer::new(seq))?;
Ok(super::Route {
programs: vec,
qos: None,
})
}
fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
where
A: serde::de::MapAccess<'de>,
{
#[derive(Deserialize)]
struct Helper {
programs: Box<[super::Program]>,
#[serde(default, deserialize_with = "deserialize_qos_opt")]
qos: Option<QoS>,
}
let helper: Helper =
Deserialize::deserialize(de::value::MapAccessDeserializer::new(map))?;
Ok(super::Route {
programs: helper.programs,
qos: helper.qos,
})
}
}
deserializer.deserialize_any(VecOrRoute)
}
}
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