picoev: improve raw mode, change fn signature for the raw_cb field to fn (mut Picoev, int) (#19817)

Author: Casper64

cmd/tools/modules/testing/common.v

@@ -209,6 +209,7 @@ pub fn new_test_session(_vargs string, will_compile bool) TestSession {
 		$if solaris {
 			skip_files << 'examples/gg/gg2.v'
 			skip_files << 'examples/pico/pico.v'
+			skip_files << 'examples/pico/raw_callback.v'
 			skip_files << 'examples/sokol/fonts.v'
 			skip_files << 'examples/sokol/drawing.v'
 		}

examples/pico/raw_callback.v

@@ -0,0 +1,39 @@
+module main
+
+import net
+import picoev
+
+const (
+	port          = 8080
+	http_response = 'HTTP/1.1 200 OK\r\nContent-type: text/html\r\nContent-length: 18\r\n\r\nHello from Picoev!'
+)
+
+fn main() {
+	println('Starting webserver on http://localhost:${port}/ ...')
+	mut pico := picoev.new(
+		port: port
+		raw_cb: handle_conn
+	)
+	pico.serve()
+}
+
+fn handle_conn(mut pv picoev.Picoev, fd int) {
+	// setup a nonblocking tcp connection
+	mut conn := &net.TcpConn{
+		sock: net.tcp_socket_from_handle_raw(fd)
+		handle: fd
+		is_blocking: false
+	}
+
+	mut buf := []u8{len: 4096}
+	// read data from the tcp connection
+	conn.read(mut buf) or { eprintln('could not read data from socket') }
+
+	println('received data:')
+	println(buf.bytestr())
+
+	conn.write(http_response.bytes()) or { eprintln('could not write response') }
+
+	// remove the socket from picoev's event loop and close the connection
+	pv.close_conn(fd)
+}

vlib/picoev/picoev.v

@@ -33,7 +33,7 @@ pub:
 	port         int = 8080
 	cb           fn (voidptr, picohttpparser.Request, mut picohttpparser.Response) = unsafe { nil }
 	err_cb       fn (voidptr, picohttpparser.Request, mut picohttpparser.Response, IError) = default_err_cb
-	raw_cb       fn (voidptr, int) = unsafe { nil }
+	raw_cb       fn (mut Picoev, int) = unsafe { nil }
 	user_data    voidptr = unsafe { nil }
 	timeout_secs int     = 8
 	max_headers  int     = 100
@@ -43,10 +43,9 @@ pub:
 
 [heap]
 pub struct Picoev {
-	cb        fn (voidptr, picohttpparser.Request, mut picohttpparser.Response) = unsafe { nil }
-	err_cb    fn (voidptr, picohttpparser.Request, mut picohttpparser.Response, IError) = default_err_cb
-	raw_cb    fn (voidptr, int) = unsafe { nil }
-	user_data voidptr = unsafe { nil }
+	cb     fn (voidptr, picohttpparser.Request, mut picohttpparser.Response) = unsafe { nil }
+	err_cb fn (voidptr, picohttpparser.Request, mut picohttpparser.Response, IError) = default_err_cb
+	raw_cb fn (mut Picoev, int) = unsafe { nil }
 
 	timeout_secs int
 	max_headers  int = 100
@@ -63,6 +62,8 @@ mut:
 	out &u8 = unsafe { nil }
 
 	date string
+pub:
+	user_data voidptr = unsafe { nil }
 }
 
 // init fills the `file_descriptors` array
@@ -213,7 +214,7 @@ fn raw_callback(fd int, events int, context voidptr) {
 	} else if events & picoev.picoev_read != 0 {
 		pv.set_timeout(fd, pv.timeout_secs)
 		if !isnil(pv.raw_cb) {
-			pv.raw_cb(pv.user_data, fd)
+			pv.raw_cb(mut pv, fd)
 			return
 		}