all: change optional to result of io (#16075)

vlib/vweb/parse.v

@@ -4,7 +4,7 @@ import net.urllib
 import net.http
 
 // Parsing function attributes for methods and path.
-fn parse_attrs(name string, attrs []string) ?([]http.Method, string) {
+fn parse_attrs(name string, attrs []string) !([]http.Method, string) {
 	if attrs.len == 0 {
 		return [http.Method.get], '/$name'
 	}
@@ -55,7 +55,7 @@ fn parse_query_from_url(url urllib.URL) map[string]string {
 	return query
 }
 
-fn parse_form_from_request(request http.Request) ?(map[string]string, map[string][]http.FileData) {
+fn parse_form_from_request(request http.Request) !(map[string]string, map[string][]http.FileData) {
 	mut form := map[string]string{}
 	mut files := map[string][]http.FileData{}
 	if request.method in methods_with_form {

vlib/vweb/sse/sse.v

@@ -42,7 +42,7 @@ pub fn new_connection(conn &net.TcpConn) &SSEConnection {
 }
 
 // sse_start is used to send the start of a Server Side Event response.
-pub fn (mut sse SSEConnection) start() ? {
+pub fn (mut sse SSEConnection) start() ! {
 	sse.conn.set_write_timeout(sse.write_timeout)
 	mut start_sb := strings.new_builder(512)
 	start_sb.write_string('HTTP/1.1 200')
@@ -58,7 +58,7 @@ pub fn (mut sse SSEConnection) start() ? {
 
 // send_message sends a single message to the http client that listens for SSE.
 // It does not close the connection, so you can use it many times in a loop.
-pub fn (mut sse SSEConnection) send_message(message SSEMessage) ? {
+pub fn (mut sse SSEConnection) send_message(message SSEMessage) ! {
 	mut sb := strings.new_builder(512)
 	if message.id != '' {
 		sb.write_string('id: $message.id\n')
@@ -73,5 +73,5 @@ pub fn (mut sse SSEConnection) send_message(message SSEMessage) ? {
 		sb.write_string('retry: $message.retry\n')
 	}
 	sb.write_string('\n')
-	sse.conn.write(sb)?
+	sse.conn.write(sb)!
 }

vlib/vweb/vweb.v

@@ -331,7 +331,7 @@ pub fn (mut ctx Context) set_cookie_with_expire_date(key string, val string, exp
 }
 
 // Gets a cookie by a key
-pub fn (ctx &Context) get_cookie(key string) ?string { // TODO refactor
+pub fn (ctx &Context) get_cookie(key string) !string { // TODO refactor
 	mut cookie_header := ctx.get_header('cookie')
 	if cookie_header == '' {
 		cookie_header = ctx.get_header('Cookie')
@@ -391,7 +391,7 @@ pub struct RunParams {
 // run_at - start a new VWeb server, listening only on a specific address `host`, at the specified `port`
 // Example: vweb.run_at(new_app(), vweb.RunParams{ host: 'localhost' port: 8099 family: .ip }) or { panic(err) }
 [manualfree]
-pub fn run_at<T>(global_app &T, params RunParams) ? {
+pub fn run_at<T>(global_app &T, params RunParams) ! {
 	if params.port <= 0 || params.port > 65535 {
 		return error('invalid port number `$params.port`, it should be between 1 and 65535')
 	}
@@ -714,11 +714,11 @@ pub fn not_found() Result {
 	return Result{}
 }
 
-fn send_string(mut conn net.TcpConn, s string) ? {
+fn send_string(mut conn net.TcpConn, s string) ! {
 	$if trace_response ? {
 		eprintln('> send_string:\n$s\n')
 	}
-	conn.write(s.bytes())?
+	conn.write(s.bytes())!
 }
 
 // Do not delete.