Simplify ConnectError

Same deal as Error

src/error.rs

@@ -174,19 +174,10 @@ impl error::Error for DbError {
 /// Reasons a new Postgres connection could fail.
 #[derive(Debug)]
 pub enum ConnectError {
-    /// An error creating `ConnectParams`.
-    BadConnectParams(Box<error::Error + Sync + Send>),
-    /// The `ConnectParams` was missing a user.
-    MissingUser,
+    /// An error relating to connection parameters.
+    ConnectParams(Box<error::Error + Sync + Send>),
     /// An error from the Postgres server itself.
     Db(Box<DbError>),
-    /// A password was required but not provided in the `ConnectParams`.
-    MissingPassword,
-    /// The Postgres server requested an authentication method not supported
-    /// by the driver.
-    UnsupportedAuthentication,
-    /// The Postgres server does not support SSL encryption.
-    NoSslSupport,
     /// An error initializing the SSL session.
     Ssl(Box<error::Error + Sync + Send>),
     /// An error communicating with the server.
@@ -197,11 +188,10 @@ impl fmt::Display for ConnectError {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         try!(fmt.write_str(error::Error::description(self)));
         match *self {
-            ConnectError::BadConnectParams(ref msg) => write!(fmt, ": {}", msg),
+            ConnectError::ConnectParams(ref msg) => write!(fmt, ": {}", msg),
             ConnectError::Db(ref err) => write!(fmt, ": {}", err),
             ConnectError::Ssl(ref err) => write!(fmt, ": {}", err),
             ConnectError::Io(ref err) => write!(fmt, ": {}", err),
-            _ => Ok(()),
         }
     }
 }
@@ -209,16 +199,8 @@ impl fmt::Display for ConnectError {
 impl error::Error for ConnectError {
     fn description(&self) -> &str {
         match *self {
-            ConnectError::BadConnectParams(_) => "Error creating `ConnectParams`",
-            ConnectError::MissingUser => "User missing in `ConnectParams`",
+            ConnectError::ConnectParams(_) => "Invalid connection parameters",
             ConnectError::Db(_) => "Error reported by Postgres",
-            ConnectError::MissingPassword => {
-                "The server requested a password but none was provided"
-            }
-            ConnectError::UnsupportedAuthentication => {
-                "The server requested an unsupported authentication method"
-            }
-            ConnectError::NoSslSupport => "The server does not support SSL",
             ConnectError::Ssl(_) => "Error initiating SSL session",
             ConnectError::Io(_) => "Error communicating with the server",
         }
@@ -226,11 +208,10 @@ impl error::Error for ConnectError {
 
     fn cause(&self) -> Option<&error::Error> {
         match *self {
-            ConnectError::BadConnectParams(ref err) => Some(&**err),
+            ConnectError::ConnectParams(ref err) => Some(&**err),
             ConnectError::Db(ref err) => Some(&**err),
             ConnectError::Ssl(ref err) => Some(&**err),
             ConnectError::Io(ref err) => Some(err),
-            _ => None,
         }
     }
 }

src/lib.rs

@@ -272,7 +272,7 @@ pub fn cancel_query<T>(params: T,
                        -> result::Result<(), ConnectError>
     where T: IntoConnectParams
 {
-    let params = try!(params.into_connect_params().map_err(ConnectError::BadConnectParams));
+    let params = try!(params.into_connect_params().map_err(ConnectError::ConnectParams));
     let mut socket = try!(priv_io::initialize_stream(&params, ssl));
 
     try!(socket.write_message(&CancelRequest {
@@ -394,12 +394,18 @@ impl InnerConnection {
     fn connect<T>(params: T, ssl: SslMode) -> result::Result<InnerConnection, ConnectError>
         where T: IntoConnectParams
     {
-        let params = try!(params.into_connect_params().map_err(ConnectError::BadConnectParams));
+        let params = try!(params.into_connect_params().map_err(ConnectError::ConnectParams));
         let stream = try!(priv_io::initialize_stream(&params, ssl));
 
         let ConnectParams { user, database, mut options, .. } = params;
 
-        let user = try!(user.ok_or(ConnectError::MissingUser));
+        let user = match user {
+            Some(user) => user,
+            None => {
+                let err: Box<StdError + StdSync + Send> = "User missing from connection parameters".into();
+                return Err(ConnectError::ConnectParams(err));
+            }
+        };
 
         let mut conn = InnerConnection {
             stream: BufStream::new(stream),
@@ -564,11 +570,15 @@ impl InnerConnection {
         match try!(self.read_message()) {
             AuthenticationOk => return Ok(()),
             AuthenticationCleartextPassword => {
-                let pass = try!(user.password.ok_or(ConnectError::MissingPassword));
+                let pass = try!(user.password.ok_or_else(|| {
+                    ConnectError::ConnectParams("a password was requested but not provided".into())
+                }));
                 try!(self.write_messages(&[PasswordMessage { password: &pass }]));
             }
             AuthenticationMD5Password { salt } => {
-                let pass = try!(user.password.ok_or(ConnectError::MissingPassword));
+                let pass = try!(user.password.ok_or_else(|| {
+                    ConnectError::ConnectParams("a password was requested but not provided".into())
+                }));
                 let mut hasher = Md5::new();
                 hasher.input(pass.as_bytes());
                 hasher.input(user.user.as_bytes());
@@ -582,7 +592,10 @@ impl InnerConnection {
             AuthenticationKerberosV5 |
             AuthenticationSCMCredential |
             AuthenticationGSS |
-            AuthenticationSSPI => return Err(ConnectError::UnsupportedAuthentication),
+            AuthenticationSSPI => {
+                return Err(ConnectError::Io(std_io::Error::new(std_io::ErrorKind::Other,
+                                                               "unsupported authentication")))
+            }
             ErrorResponse { fields } => return DbError::new_connect(fields),
             _ => return Err(ConnectError::Io(bad_response())),
         }

src/priv_io.rs

@@ -1,5 +1,6 @@
 use byteorder::ReadBytesExt;
 use net2::TcpStreamExt;
+use std::error::Error;
 use std::io;
 use std::io::prelude::*;
 use std::fmt;
@@ -172,7 +173,8 @@ pub fn initialize_stream(params: &ConnectParams,
 
     if try!(socket.read_u8()) == b'N' {
         if ssl_required {
-            return Err(ConnectError::NoSslSupport);
+            let err: Box<Error + Sync + Send> = "The server does not support SSL".into();
+            return Err(ConnectError::Ssl(err));
         } else {
             return Ok(Box::new(socket));
         }

tests/test.rs

@@ -698,7 +698,7 @@ fn test_plaintext_pass() {
 fn test_plaintext_pass_no_pass() {
     let ret = Connection::connect("postgres://pass_user@localhost/postgres", SslMode::None);
     match ret {
-        Err(ConnectError::MissingPassword) => (),
+        Err(ConnectError::ConnectParams(..)) => (),
         Err(err) => panic!("Unexpected error {:?}", err),
         _ => panic!("Expected error")
     }
@@ -723,7 +723,7 @@ fn test_md5_pass() {
 fn test_md5_pass_no_pass() {
     let ret = Connection::connect("postgres://md5_user@localhost/postgres", SslMode::None);
     match ret {
-        Err(ConnectError::MissingPassword) => (),
+        Err(ConnectError::ConnectParams(..)) => (),
         Err(err) => panic!("Unexpected error {:?}", err),
         _ => panic!("Expected error")
     }