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/*
* meli - plugins
*
* Copyright 2019 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* meli is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with meli. If not, see <http://www.gnu.org/licenses/>.
*/
use super::*;
#[derive(Debug)]
pub struct RpcChannel {
stream: UnixStream,
session: Uuid,
}
#[derive(Debug, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub struct PluginGreeting {
version: String,
}
impl RpcChannel {
pub fn new(stream: UnixStream, session: &Uuid) -> Result<RpcChannel> {
let mut ret = RpcChannel {
stream,
session: *session,
};
let greeting: PluginGreeting = ret.from_read().map_err(|err| {
MeliError::new(format!("Could not get correct plugin greeting: {}", err))
})?;
debug!(&greeting);
//if greeting.version != "dev" {
// return Err("Plugin is not compatible with our API (dev)".into());
//}
ret.write_ref(&rmpv::ValueRef::String(session.to_string().as_str().into()))?;
debug!(ret.expect_ack())?;
Ok(ret)
}
pub fn expect_ack(&mut self) -> Result<()> {
debug!("expect_ack()");
let ack: u32 = debug!(rmp_serde::decode::from_read(&mut self.stream))
.map_err(|_| MeliError::new("Plugin did not return ACK."))?;
if 0x6 == ack {
Ok(())
} else {
Err(MeliError::new("Plugin did not return ACK."))
}
}
pub fn ack(&mut self) -> Result<()> {
debug!("ack()");
debug!(rmpv::encode::write_value_ref(
&mut self.stream,
&rmpv::ValueRef::Integer(0x6.into())
))
.map_err(|err| MeliError::new(err.to_string()))?;
let _ = self.stream.flush();
Ok(())
}
pub fn write_ref(&mut self, value_ref: &rmpv::ValueRef) -> Result<()> {
debug!("write_ref() {:?}", value_ref);
debug!(rmpv::encode::write_value_ref(&mut self.stream, value_ref))
.map_err(|err| MeliError::new(err.to_string()))?;
let _ = self.stream.flush();
Ok(())
}
pub fn read(&mut self) -> Result<rmpv::Value> {
debug!("read()");
let ret: RpcResult = debug!(rmp_serde::decode::from_read(&mut self.stream))
.map_err(|err| MeliError::new(err.to_string()))?;
let _ = self.stream.flush();
self.ack()?;
debug!("read() ret={:?}", &ret);
ret.into()
}
pub fn from_read<T>(&mut self) -> Result<T>
where
T: core::fmt::Debug + serde::de::DeserializeOwned,
{
debug!("from_read()");
let ret: Result<T> = debug!(rmp_serde::decode::from_read(&mut self.stream))
.map_err(|err| MeliError::new(err.to_string()));
let _ = self.stream.flush();
self.ack()?;
debug!("read() ret={:?}", &ret);
ret
}
}
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
#[serde(tag = "t", content = "c")]
enum RpcResult {
Ok(rmpv::Value),
Err(String),
}
impl RpcResult {
fn into(self) -> Result<rmpv::Value> {
match self {
RpcResult::Ok(v) => Ok(v),
RpcResult::Err(err) => Err(MeliError::new(err)),
}
}
}
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
#[serde(tag = "t", content = "c")]
pub enum PluginResult<T: core::fmt::Debug + Clone> {
Ok(T),
Err(String),
}
impl<T: core::fmt::Debug + Clone + serde::Serialize + serde::de::DeserializeOwned> Into<Result<T>>
for PluginResult<T>
{
fn into(self) -> Result<T> {
match self {
PluginResult::Ok(v) => Ok(v),
PluginResult::Err(err) => Err(MeliError::new(err)),
}
}
}
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