vweb: fix empty post request blocking

vlib/strings/builder_c.v

@@ -19,6 +19,11 @@ pub fn new_builder(initial_size int) Builder {
 	}
 }
 
+pub fn (b mut Builder) write_bytes(bytes byteptr, howmany int) {
+	b.buf.push_many(bytes, howmany)
+	b.len += howmany
+}
+
 pub fn (b mut Builder) write_b(data byte) {
 	b.buf << data
 	b.len++

vlib/vweb/vweb.v

@@ -32,6 +32,7 @@ const (
 		'.svg': 'image/svg+xml',
 		'.xml': 'text/xml; charset=utf-8'
 	}
+	MAX_HTTP_POST_SIZE = 1024 * 1024
 )
 
 pub struct Context {
@@ -125,12 +126,25 @@ pub fn run<T>(app mut T, port int) {
 		conn := l.accept() or { panic('accept() failed') }
 		//foobar<T>()
 		// TODO move this to handle_conn<T>(conn, app)
-		first_line:= conn.read_line()
-		if first_line == '' {
+		message := readall(conn)
+		
+		if message.len > MAX_HTTP_POST_SIZE {
+			println('message.len = $message.len > MAX_HTTP_POST_SIZE')
 			conn.send_string(HTTP_500) or {}
 			conn.close() or {}
 			continue
 		}
+		
+		lines := message.split_into_lines()
+		
+		if lines.len < 2 {
+			conn.send_string(HTTP_500) or {}
+			conn.close() or {}
+			continue
+		}
+		
+		first_line := strip(lines[0])
+		$if debug { println(first_line) }
 		// Parse the first line
 		// "GET / HTTP/1.1"
 		//first_line := s.all_before('\n')
@@ -142,13 +156,18 @@ pub fn run<T>(app mut T, port int) {
 			continue
 		}
 		mut headers := []string
-		for {
-			if headers.len >= 30 { break }
-			header := conn.read_line()
-			headers << header
-			//println('header="$header" len = ' + header.len.str())
-			if header.len <= 2 { break }
+		mut body := ''
+		mut in_headers := true
+		for line in lines[1..] {
+			sline := strip(line)
+			if sline == '' { in_headers = false }
+			if in_headers {
+				headers << sline
+			} else {
+				body += strip(sline) + '\r\n'
+			}
 		}
+		
 		mut action := vals[1][1..].all_before('/')
 		if action.contains('?') {
 			action = action.all_before('?')
@@ -178,19 +197,8 @@ pub fn run<T>(app mut T, port int) {
 		}
 		//}
 		if req.method in methods_with_form {
-			/*
-			for {
-				line := conn.read_line()
-				if line == '' || line == '\r\n' {
-					break
-				}
-				//if line.contains('POST') || line == '' {
-					//break
-				//}
-			}
-			*/
-			line := conn.read_line()
-			app.vweb.parse_form(line)
+			body = strip(body)
+			app.vweb.parse_form(body)
 		}
 		if vals.len < 2 {
 			$if debug {
@@ -219,10 +227,6 @@ pub fn run<T>(app mut T, port int) {
 	}
 }
 
-
-pub fn foobar<T>() {
-}
-
 fn (ctx mut Context) parse_form(s string) {
 	if !(ctx.req.method in methods_with_form) {
 		return
@@ -248,6 +252,8 @@ fn (ctx mut Context) parse_form(s string) {
 		ctx.form[key] = val
 	}
 	//}
+	// todo: parse form-data and application/json
+	// ...
 }
 
 fn (ctx mut Context) scan_static_directory(directory_path, mount_path string) {
@@ -297,3 +303,23 @@ pub fn (ctx mut Context) serve_static(url, file_path, mime_type string) {
 	ctx.static_files[url] = file_path
 	ctx.static_mime_types[url] = mime_type
 }
+
+
+fn readall(conn net.Socket) string {
+	// read all message from socket
+	mut message := ''
+	buf := [1024]byte
+	for {
+		n := C.recv(conn.sockfd, buf, 1024, 2)
+		m := conn.crecv(buf, 1024)
+		message += string( byteptr(buf), m )
+		if message.len > MAX_HTTP_POST_SIZE { break }
+		if n == m { break }
+	}
+	return message
+}
+
+fn strip(s string) string {
+	// strip('\nabc\r\n') => 'abc'
+	return s.trim('\r\n')
+}