1 files changed, 144 insertions, 0 deletions
diff --git a/ui/src/plugins/rpc.rs b/ui/src/plugins/rpc.rs
new file mode 100644
index 00000000..1d3b91a0
--- /dev/null
+++ b/ui/src/plugins/rpc.rs
@@ -0,0 +1,144 @@
+/*
+ * 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::*;
+use rmp_serde::Deserializer;
+use serde::{Deserialize, Serialize};
+
+#[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(mut stream: UnixStream, session: &Uuid) -> Result<RpcChannel> {
+        let mut ret = RpcChannel {
+            stream,
+            session: session.clone(),
+        };
+        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)),
+        }
+    }
+}