Implement the Error trait on ws Error type (#117)

* Implement the Error trait on ws Error type

* Fix compile error in test

Author: faern

ws/src/server_builder.rs

@@ -1,3 +1,4 @@
+use std::fmt;
 use std::io;
 use std::net::SocketAddr;
 use std::sync::Arc;
@@ -37,6 +38,28 @@ impl From<io::Error> for Error {
 	}
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::Io(ref e) => e.fmt(f),
+            Error::WebSocket(ref e) => e.fmt(f),
+        }
+    }
+}
+
+impl ::std::error::Error for Error {
+    fn description(&self) -> &str {
+        "Starting the JSON-RPC WebSocket server failed"
+    }
+
+    fn cause(&self) -> Option<&::std::error::Error> {
+        Some(match *self {
+            Error::Io(ref e) => e,
+            Error::WebSocket(ref e) => e,
+        })
+    }
+}
+
 /// Builder for `WebSockets` server
 pub struct ServerBuilder<M: core::Metadata, S: core::Middleware<M>> {
 	handler: Arc<core::MetaIoHandler<M, S>>,

ws/src/tests.rs

@@ -70,7 +70,7 @@ fn serve(port: u16) -> Server {
 		.request_middleware(|req: &ws::Request| {
 			if req.resource() == "/intercepted" {
 				let mut res = ws::Response::new(200, "OK");
-				res.set_body(b"Hello World!");
+				res.set_body("Hello World!".to_owned());
 				Some(res)
 			} else {
 				None