library: io: expose ID, User and Config via methods

These fields can be copied safely and is useful information outside the library, so they are exposed via methods that copy their value.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

io.go

@@ -21,6 +21,32 @@ type Client struct {
 	conn   net.Conn
 }
 
+// ID returns the Client Application ID nil-safely
+func (d *Client) ID() string {
+	if d == nil {
+		return ""
+	}
+	return d.id
+}
+
+// User returns the Client User nil-safely
+func (d *Client) User() (User, bool) {
+	if d == nil || d.user == nil {
+		return User{}, false
+	}
+	return *d.user, true
+
+}
+
+// Config returns the Client Config nil-safely
+func (d *Client) Config() (Config, bool) {
+	if d == nil || d.config == nil {
+		return Config{}, false
+	}
+	return *d.config, true
+
+}
+
 // Raw wraps around the Raw method to provide generic json parsing
 func Raw[T any](d *Client, opcode uint32, payload any) (uint32, T, error) {
 	var p T
@@ -82,8 +108,7 @@ func (d *Client) raw(opcode uint32, payload any) (uint32, []byte, error) {
 
 // Close the client, this is required before exit
 func (d *Client) Close() error {
-	if !d.dialed {
-		// silently succeed because client activation is implicit
+	if d == nil || !d.dialed {
 		return nil
 	}