Error Handling

src/lib.rs

@@ -30,43 +30,53 @@ impl OtdIpc {
             1,
         )?;
 
-        stream.write_all(&Vec::from(hello))?;
+        stream.write_all(&Vec::try_from(hello)?)?;
 
         Ok(Self { stream })
     }
 }
 
 impl Iterator for OtdIpc {
-    type Item = Message;
+    type Item = Result<Message, Box<dyn std::error::Error>>;
 
     fn next(&mut self) -> Option<Self::Item> {
         let mut raw_header = [0; size_of::<Header>()];
-        self.stream.read_exact(&mut raw_header).unwrap();
+        if let Err(e) = self.stream.read_exact(&mut raw_header) {
+            return Some(Err(e.into()));
+        };
+
+        let header: Header = match raw_header[..].try_into() {
+            Ok(e) => e,
+            Err(e) => return Some(Err(e)),
+        };
 
-        let header: Header = raw_header[..].try_into().unwrap();
         let mut raw_buffer = vec![0; (header.size as usize) - size_of::<Header>()];
-        self.stream.read_exact(&mut raw_buffer).unwrap();
 
-        match header.message_type {
+        if let Err(e) = self.stream.read_exact(&mut raw_buffer) {
-            messages::MessageType::None => None,
+            return Some(Err(e.into()));
-            messages::MessageType::DeviceInfo => Some(Message::DeviceInfo(Box::new(
-                DeviceInfo::try_from(&raw_buffer[..]).unwrap(),
-            ))),
-            messages::MessageType::State => {
-                Some(Message::State(State::try_from(&raw_buffer[..]).unwrap()))
         }
-            messages::MessageType::Ping => {
+
-                Some(Message::Ping(Ping::try_from(&raw_buffer[..]).unwrap()))
+        Some(get_message(header.message_type, &raw_buffer))
     }
+}
+
+fn get_message(
+    message_type: MessageType,
+    raw_buffer: &[u8],
+) -> Result<Message, Box<dyn std::error::Error>> {
+    Ok(match message_type {
+        messages::MessageType::None => Message::None,
+        messages::MessageType::DeviceInfo => {
+            Message::DeviceInfo(Box::new(DeviceInfo::try_from(raw_buffer)?))
+        }
+        messages::MessageType::State => Message::State(State::try_from(raw_buffer)?),
+        messages::MessageType::Ping => Message::Ping(Ping::try_from(raw_buffer)?),
         messages::MessageType::DebugMessage => {
-                Some(Message::DebugMessage(DebugMessage::from(&raw_buffer[..])))
+            Message::DebugMessage(DebugMessage::from(raw_buffer))
         }
         messages::MessageType::Experimental => {
-                Some(Message::Experimental(Experimental::from(&raw_buffer[..])))
+            Message::Experimental(Experimental::from(raw_buffer))
-            }
-            messages::MessageType::Hello => {
-                Some(Message::Hello(Hello::try_from(&raw_buffer[..]).unwrap()))
-            }
-        }
         }
+        messages::MessageType::Hello => Message::Hello(Hello::try_from(raw_buffer)?),
+    })
 }

src/main.rs

@@ -4,7 +4,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let otd_ipc = OtdIpc::new("otd-ipc-rs", "master")?;
 
     for msg in otd_ipc {
-        dbg!(msg);
+        dbg!(msg?);
     }
 
     Ok(())

src/messages/device_info.rs

@@ -13,11 +13,11 @@ pub struct DeviceInfo {
 }
 
 impl TryFrom<&[u8]> for DeviceInfo {
-    type Error = &'static str;
+    type Error = Box<dyn std::error::Error>;
 
     fn try_from(mut bytes: &[u8]) -> Result<Self, Self::Error> {
         if bytes.len() < 12 + 256 + 256 {
-            return Err("buffer too small");
+            return Err("buffer too small".into());
         }
 
         let max_x = f32::from_le_bytes(take::<4>(&mut bytes)?);

src/messages/header.rs

@@ -12,11 +12,11 @@ pub struct Header {
 }
 
 impl TryFrom<&[u8]> for Header {
-    type Error = &'static str;
+    type Error = Box<dyn std::error::Error>;
 
     fn try_from(mut bytes: &[u8]) -> Result<Self, Self::Error> {
         if bytes.len() < 12 {
-            return Err("buffer too small");
+            return Err("buffer too small".into());
         }
 
         Ok(Self {

src/messages/hello.rs

@@ -45,8 +45,10 @@ impl Hello {
     }
 }
 
-impl From<Hello> for Vec<u8> {
+impl TryFrom<Hello> for Vec<u8> {
-    fn from(value: Hello) -> Self {
+    type Error = Box<dyn std::error::Error>;
+
+    fn try_from(value: Hello) -> Result<Self, Self::Error> {
         let mut output = Vec::with_capacity(std::mem::size_of::<Hello>());
 
         // Header
@@ -56,22 +58,22 @@ impl From<Hello> for Vec<u8> {
 
         // Hello
         output.extend_from_slice(&value.protocol_version.to_le_bytes());
-        output.extend_from_slice(&str_to_fixed(&value.human_readable_name).unwrap());
+        output.extend_from_slice(&str_to_fixed(&value.human_readable_name)?);
-        output.extend_from_slice(&str_to_fixed(&value.human_readable_version).unwrap());
+        output.extend_from_slice(&str_to_fixed(&value.human_readable_version)?);
-        output.extend_from_slice(&str_to_fixed(&value.implementation_id).unwrap());
+        output.extend_from_slice(&str_to_fixed(&value.implementation_id)?);
 
         output.push(value.compatibility_version);
 
-        output
+        Ok(output)
     }
 }
 
 impl TryFrom<&[u8]> for Hello {
-    type Error = &'static str;
+    type Error = Box<dyn std::error::Error>;
 
     fn try_from(mut bytes: &[u8]) -> Result<Self, Self::Error> {
         if bytes.len() < 8 + 256 + 256 + 256 + 1 {
-            return Err("buffer too small");
+            return Err("buffer too small".into());
         }
 
         // random 4 bytes are here now, wtf?

src/messages/mod.rs

@@ -18,6 +18,7 @@ pub use state::*;
 
 #[derive(Debug, Clone)]
 pub enum Message {
+    None,
     DeviceInfo(Box<DeviceInfo>),
     State(State),
     Ping(Ping),
@@ -27,11 +28,13 @@ pub enum Message {
 }
 
 // helper to read fixed-size chunks
-pub(super) fn take<const N: usize>(bytes: &mut &[u8]) -> Result<[u8; N], &'static str> {
+pub(super) fn take<const N: usize>(
+    bytes: &mut &[u8],
+) -> Result<[u8; N], Box<dyn std::error::Error>> {
     if bytes.len() < N {
-        return Err("buffer too small");
+        return Err("buffer too small".into());
     }
     let (head, tail) = bytes.split_at(N);
     *bytes = tail;
-    Ok(head.try_into().unwrap())
+    Ok(head.try_into()?)
 }

src/messages/ping.rs

@@ -10,11 +10,11 @@ pub struct Ping {
 }
 
 impl TryFrom<&[u8]> for Ping {
-    type Error = &'static str;
+    type Error = Box<dyn std::error::Error>;
 
     fn try_from(mut bytes: &[u8]) -> Result<Self, Self::Error> {
         if bytes.len() < 4 {
-            return Err("buffer too small");
+            return Err("buffer too small".into());
         }
 
         Ok(Self {

src/messages/state.rs

@@ -131,11 +131,11 @@ impl State {
 }
 
 impl TryFrom<&[u8]> for State {
-    type Error = &'static str;
+    type Error = Box<dyn std::error::Error>;
 
     fn try_from(mut bytes: &[u8]) -> Result<Self, Self::Error> {
         if bytes.len() < 29 {
-            return Err("buffer too small");
+            return Err("buffer too small".into());
         }
 
         Ok(Self {