Add error type

src/error.rs

@@ -0,0 +1,33 @@
+use std::error::Error as StdError;
+use std::result::Result as StdResult;
+use std::io::Error as IoError;
+use std::fmt;
+
+#[derive(Debug)]
+pub enum Error {
+    Io(IoError),
+    Conversion,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(self.description())
+    }
+}
+
+impl StdError for Error {
+    fn description(&self) -> &str {
+        match *self {
+            Error::Conversion => "Failed to convert values",
+            Error::Io(ref err) => err.description()
+        }
+    }
+}
+
+impl From<IoError> for Error {
+    fn from(err: IoError) -> Self {
+        Error::Io(err)
+    }
+}
+
+pub type Result<T> = StdResult<T, Error>;

src/lib.rs

@@ -11,6 +11,7 @@ extern crate libc;
 #[macro_use]
 mod macros;
 
+mod error;
 mod utils;
 mod connection;
 mod models;