Merge branch 'aleksanderkrauze-feature/implement-std-error-for-birdc-…

…error'. See PR #1

src/connection.rs

@@ -137,7 +137,7 @@ impl Connection {
             // process only if we find the first entry to be a 1001
             if let Some(msg_1001) = Interface::from_enum(first_msg) {
                 // get the position of the next 1001
-                let next_1001_idx = (&messages[idx..])
+                let next_1001_idx = messages[idx..]
                     .iter()
                     .position(|x| matches!(x, Message::InterfaceList(_)))
                     .unwrap_or(messages.len() - idx)
@@ -619,7 +619,7 @@ fn parse_message(code: u32, buffer: &[u8], start_pos: usize, msg_size: usize) ->
         }
         idx += 1;
 
-        if let Some(nl_pos) = (&buffer[pos..]).iter().position(|it| *it == b'\n') {
+        if let Some(nl_pos) = buffer[pos..].iter().position(|it| *it == b'\n') {
             let src = &buffer[pos..(pos + nl_pos)];
             v.extend_from_slice(src);
             pos += src.len() + 1;

src/error.rs

@@ -1,4 +1,4 @@
-use std::{num::ParseIntError, str::Utf8Error};
+use std::{fmt, num::ParseIntError, str::Utf8Error};
 
 use super::Message;
 
@@ -22,6 +22,43 @@ pub enum Error {
     ParseError(Vec<Message>),
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::IoError(_) => write!(f, "IO operation failed"),
+            Error::ProtocolError(msg) => {
+                write!(f, "received an error message from server")?;
+                match msg {
+                    Message::ReplyTooLong(_) => write!(f, ": reply too long"),
+                    Message::RouteNotFound(_) => write!(f, ": route not found"),
+                    Message::ConfigurationFileError(_) => write!(f, ": configuration file error"),
+                    Message::NoProtocolsMatch(_) => write!(f, ": no protocols match"),
+                    Message::StoppedDueToReconfiguration(_) => {
+                        write!(f, ": stopped due to reconfiguration")
+                    }
+                    Message::ProtocolDown(_) => write!(f, ": protocol is down => connot dump"),
+                    Message::ReloadFailed(_) => write!(f, ": reload failed"),
+                    Message::AccessDenied(_) => write!(f, ": access denied"),
+                    Message::RuntimeError(..) => write!(f, ": evaluation runtime error"),
+                    _ => Ok(()),
+                }
+            }
+            Error::OperationInProgress => write!(f, "another request is already in progress"),
+            Error::InvalidToken(_) => write!(f, "received invalid token"),
+            Error::ParseError(_) => write!(f, "failed to parse server response"),
+        }
+    }
+}
+
+impl std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::IoError(err) => Some(err),
+            _ => None,
+        }
+    }
+}
+
 impl Error {
     pub fn eof(err: &str) -> Self {
         Self::IoError(std::io::Error::new(std::io::ErrorKind::UnexpectedEof, err))