picoev: extract common code to a trace_fd/1 function, cleanup

vlib/picoev/logging.v

@@ -4,3 +4,8 @@ module picoev
 fn elog(msg string) {
 	eprintln(msg)
 }
+
+@[if trace_fd ?]
+fn trace_fd(msg string) {
+	eprintln(msg)
+}

vlib/picoev/loop_default.c.v

@@ -83,18 +83,13 @@ fn (mut pv Picoev) poll_once(max_wait_in_sec int) int {
 				if C.FD_ISSET(target.fd, &writefds) != 0 {
 					read_events |= picoev_write
 				}
-
 				if read_events != 0 {
-					$if trace_fd ? {
+					trace_fd('do callback ${target.fd}')
-						eprintln('do callback ${target.fd}')
-					}
-
 					// do callback!
 					unsafe { target.cb(target.fd, read_events, &pv) }
 				}
 			}
 		}
 	}
-
 	return 0
 }

vlib/picoev/picoev.v

@@ -88,10 +88,8 @@ pub:
 
 // init fills the `file_descriptors` array
 pub fn (mut pv Picoev) init() {
-	assert max_fds > 0
+	// assert max_fds > 0
-
 	pv.num_loops = 0
-
 	for i in 0 .. max_fds {
 		pv.file_descriptors[i] = &Target{}
 	}
@@ -103,21 +101,17 @@ pub fn (mut pv Picoev) add(fd int, events int, timeout int, callback voidptr) in
 	if pv == unsafe { nil } || fd < 0 || fd >= max_fds {
 		return -1 // Invalid arguments
 	}
-
 	mut target := pv.file_descriptors[fd]
 	target.fd = fd
 	target.cb = callback
 	target.loop_id = pv.loop.id
 	target.events = 0
-
 	if pv.update_events(fd, events | picoev_add) != 0 {
 		if pv.delete(fd) != 0 {
 			elog('Error during del')
 		}
-
 		return -1
 	}
-
 	pv.set_timeout(fd, timeout)
 	return 0
 }
@@ -135,18 +129,12 @@ pub fn (mut pv Picoev) delete(fd int) int {
 	if fd < 0 || fd >= max_fds {
 		return -1 // Invalid fd
 	}
-
 	mut target := pv.file_descriptors[fd]
-
+	trace_fd('remove ${fd}')
-	$if trace_fd ? {
-		eprintln('remove ${fd}')
-	}
-
 	if pv.update_events(fd, picoev_del) != 0 {
 		elog('Error during update_events. event: `picoev.picoev_del`')
 		return -1
 	}
-
 	pv.set_timeout(fd, 0)
 	target.loop_id = -1
 	target.fd = 0
@@ -156,19 +144,16 @@ pub fn (mut pv Picoev) delete(fd int) int {
 
 fn (mut pv Picoev) loop_once(max_wait_in_sec int) int {
 	pv.loop.now = get_time()
-
 	if pv.poll_once(max_wait_in_sec) != 0 {
 		elog('Error during poll_once')
 		return -1
 	}
-
+	if max_wait_in_sec == 0 {
-	if max_wait_in_sec != 0 {
-		pv.loop.now = get_time() // Update loop start time again if waiting occurred
-	} else {
 		// If no waiting, skip timeout handling for potential performance optimization
 		return 0
 	}
-
+	// Update loop start time again if waiting occurred
+	pv.loop.now = get_time()
 	pv.handle_timeout()
 	return 0
 }
@@ -178,10 +163,10 @@ fn (mut pv Picoev) loop_once(max_wait_in_sec int) int {
 @[direct_array_access; inline]
 fn (mut pv Picoev) set_timeout(fd int, secs int) {
 	assert fd < max_fds
-	if secs != 0 {
+	if secs == 0 {
-		pv.timeouts[fd] = pv.loop.now + secs
-	} else {
 		pv.timeouts.delete(fd)
+	} else {
+		pv.timeouts[fd] = pv.loop.now + secs
 	}
 }
 
@@ -191,13 +176,11 @@ fn (mut pv Picoev) set_timeout(fd int, secs int) {
 @[direct_array_access; inline]
 fn (mut pv Picoev) handle_timeout() {
 	mut to_remove := []int{}
-
 	for fd, timeout in pv.timeouts {
 		if timeout <= pv.loop.now {
 			to_remove << fd
 		}
 	}
-
 	for fd in to_remove {
 		target := pv.file_descriptors[fd]
 		assert target.loop_id == pv.loop.id
@@ -210,26 +193,19 @@ fn (mut pv Picoev) handle_timeout() {
 fn accept_callback(listen_fd int, events int, cb_arg voidptr) {
 	mut pv := unsafe { &Picoev(cb_arg) }
 	accepted_fd := accept(listen_fd)
-
 	if accepted_fd == -1 {
 		if fatal_socket_error(accepted_fd) == false {
 			return
 		}
-
 		elog('Error during accept')
 		return
 	}
-
 	if accepted_fd >= max_fds {
 		// should never happen
 		close_socket(accepted_fd)
 		return
 	}
-
+	trace_fd('accept ${accepted_fd}')
-	$if trace_fd ? {
-		eprintln('accept ${accepted_fd}')
-	}
-
 	setup_sock(accepted_fd) or {
 		elog('setup_sock failed, fd: ${accepted_fd}, listen_fd: ${listen_fd}, err: ${err.code()}')
 		pv.error_callback(pv.user_data, picohttpparser.Request{}, mut &picohttpparser.Response{},
@@ -256,17 +232,12 @@ fn raw_callback(fd int, events int, context voidptr) {
 	defer {
 		pv.idx[fd] = 0
 	}
-
 	if events & picoev_timeout != 0 {
-		$if trace_fd ? {
+		trace_fd('timeout ${fd}')
-			eprintln('timeout ${fd}')
-		}
-
 		if !isnil(pv.raw_callback) {
 			pv.raw_callback(mut pv, fd, events)
 			return
 		}
-
 		pv.close_conn(fd)
 		return
 	} else if events & picoev_read != 0 {
@@ -275,13 +246,11 @@ fn raw_callback(fd int, events int, context voidptr) {
 			pv.raw_callback(mut pv, fd, events)
 			return
 		}
-
 		mut request_buffer := pv.buf
 		unsafe {
 			request_buffer += fd * pv.max_read // pointer magic
 		}
 		mut req := picohttpparser.Request{}
-
 		// Response init
 		mut response_buffer := pv.out
 		unsafe {
@@ -293,7 +262,6 @@ fn raw_callback(fd int, events int, context voidptr) {
 			buf:       response_buffer
 			date:      pv.date.str
 		}
-
 		for {
 			// Request parsing loop
 			r := req_read(fd, request_buffer, pv.max_read, pv.idx[fd]) // Get data from socket
@@ -305,15 +273,12 @@ fn raw_callback(fd int, events int, context voidptr) {
 				if fatal_socket_error(fd) == false {
 					return
 				}
-
 				elog('Error during req_read')
-
 				// fatal error
 				pv.close_conn(fd)
 				return
 			}
 			pv.idx[fd] += r
-
 			mut s := unsafe { tos(request_buffer, pv.idx[fd]) }
 			pret := req.parse_request(s) or {
 				// Parse error
@@ -323,7 +288,6 @@ fn raw_callback(fd int, events int, context voidptr) {
 			if pret > 0 { // Success
 				break
 			}
-
 			assert pret == -2
 			// request is incomplete, continue the loop
 			if pv.idx[fd] == sizeof(request_buffer) {
@@ -331,7 +295,6 @@ fn raw_callback(fd int, events int, context voidptr) {
 				return
 			}
 		}
-
 		// Callback (should call .end() itself)
 		pv.cb(pv.user_data, req, mut &res)
 	} else if events & picoev_write != 0 {
@@ -354,7 +317,6 @@ pub fn new(config Config) !&Picoev {
 		elog('Error during listen: ${err}')
 		return err
 	}
-
 	mut pv := &Picoev{
 		num_loops:      1
 		cb:             config.cb
@@ -366,12 +328,10 @@ pub fn new(config Config) !&Picoev {
 		max_read:       config.max_read
 		max_write:      config.max_write
 	}
-
 	if isnil(pv.raw_callback) {
 		pv.buf = unsafe { malloc_noscan(max_fds * config.max_read + 1) }
 		pv.out = unsafe { malloc_noscan(max_fds * config.max_write + 1) }
 	}
-
 	// epoll on linux
 	// kqueue on macos and bsd
 	// select on windows and others
@@ -382,15 +342,12 @@ pub fn new(config Config) !&Picoev {
 	} $else {
 		pv.loop = create_select_loop(0) or { panic(err) }
 	}
-
 	if pv.loop == unsafe { nil } {
 		elog('Failed to create loop')
 		close_socket(listening_socket_fd)
 		return unsafe { nil }
 	}
-
 	pv.init()
-
 	pv.add(listening_socket_fd, picoev_read, 0, accept_callback)
 	return pv
 }
@@ -399,7 +356,6 @@ pub fn new(config Config) !&Picoev {
 // See also picoev.new().
 pub fn (mut pv Picoev) serve() {
 	spawn update_date_string(mut pv)
-
 	for {
 		pv.loop_once(1)
 	}

vlib/picoev/socket_util.c.v

@@ -30,10 +30,7 @@ fn accept(fd int) int {
 
 @[inline]
 fn close_socket(fd int) {
-	$if trace_fd ? {
+	trace_fd('close ${fd}')
-		eprintln('close ${fd}')
-	}
-
 	$if windows {
 		C.closesocket(fd)
 	} $else {
@@ -44,11 +41,9 @@ fn close_socket(fd int) {
 @[inline]
 fn setup_sock(fd int) ! {
 	flag := 1
-
 	if C.setsockopt(fd, C.IPPROTO_TCP, C.TCP_NODELAY, &flag, sizeof(int)) < 0 {
 		return error('setup_sock.setup_sock failed')
 	}
-
 	$if freebsd {
 		if C.fcntl(fd, C.F_SETFL, C.SOCK_NONBLOCK) != 0 {
 			return error('fcntl failed')
@@ -88,11 +83,7 @@ fn fatal_socket_error(fd int) bool {
 			return false
 		}
 	}
-
+	trace_fd('fatal error ${fd}: ${C.errno}')
-	$if trace_fd ? {
-		eprintln('fatal error ${fd}: ${C.errno}')
-	}
-
 	return true
 }
 
@@ -103,22 +94,16 @@ fn listen(config Config) !int {
 	if fd == -1 {
 		return error('Failed to create socket')
 	}
-
+	trace_fd('listen: ${fd}')
-	$if trace_fd ? {
-		eprintln('listen: ${fd}')
-	}
-
 	// Setting flags for socket
 	flag := 1
 	flag_zero := 0
 	net.socket_error(C.setsockopt(fd, C.SOL_SOCKET, C.SO_REUSEADDR, &flag, sizeof(int)))!
-
 	if config.family == .ip6 {
 		// set socket to dualstack so connections to both ipv4 and ipv6 addresses
 		// can be accepted
 		net.socket_error(C.setsockopt(fd, C.IPPROTO_IPV6, C.IPV6_V6ONLY, &flag_zero, sizeof(int)))!
 	}
-
 	$if linux {
 		// epoll socket options
 		net.socket_error(C.setsockopt(fd, C.SOL_SOCKET, C.SO_REUSEPORT, &flag, sizeof(int)))!
@@ -131,20 +116,18 @@ fn listen(config Config) !int {
 				sizeof(int)))!
 		}
 	}
-
 	// addr settings
 	saddr := '${config.host}:${config.port}'
-	addrs := net.resolve_addrs(saddr, config.family, .tcp) or { panic(err) }
+	addrs := net.resolve_addrs(saddr, config.family, .tcp) or {
+		panic('Error while resolving `${saddr}`, err: ${err}')
+	}
 	addr := addrs[0]
 	alen := addr.len()
-
 	net.socket_error_message(C.bind(fd, voidptr(&addr), alen), 'binding to ${saddr} failed')!
 	net.socket_error_message(C.listen(fd, C.SOMAXCONN), 'listening on ${saddr} with maximum backlog pending queue of ${C.SOMAXCONN}, failed')!
-
 	setup_sock(fd) or {
 		config.err_cb(config.user_data, picohttpparser.Request{}, mut &picohttpparser.Response{},
 			err)
 	}
-
 	return fd
 }