v/vlib/x/websocket/websocket_server.v

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// The module websocket implements the websocket server capabilities
module websocket
import net
import x.openssl
import log
import sync
import time
import rand
pub struct Server {
mut:
clients map[string]&ServerClient
logger &log.Log
ls net.TcpListener
accept_client_callbacks []AcceptClientFn
message_callbacks []MessageEventHandler
close_callbacks []CloseEventHandler
pub:
port int
is_ssl bool
pub mut:
ping_interval int = 30 // in seconds
state State
}
struct ServerClient {
pub:
resource_name string
client_key string
pub mut:
server &Server
client &Client
}
pub fn new_server(port int, route string) &Server {
return &Server{
port: port
logger: &log.Log{
level: .info
}
state: .closed
}
}
pub fn (mut s Server) set_ping_interval(seconds int) {
s.ping_interval = seconds
}
pub fn (mut s Server) listen() ? {
s.logger.info('websocket server: start listen on port $s.port')
s.ls = net.listen_tcp(s.port)?
s.set_state(.open)
go s.handle_ping()
for {
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mut c := s.accept_new_client() or {
continue
}
go s.serve_client(mut c)
}
s.logger.info('websocket server: end listen on port $s.port')
}
fn (mut s Server) close() {
}
// Todo: make thread safe
fn (mut s Server) handle_ping() {
mut clients_to_remove := []string{}
for s.state == .open {
time.sleep(s.ping_interval)
for _, cli in s.clients {
mut c := cli
if c.client.state == .open {
c.client.ping() or {
s.logger.debug('server-> error sending ping to client')
// todo fix better close message, search the standard
c.client.close(1002, 'Clossing connection: ping send error') or {
// we want to continue even if error
continue
}
clients_to_remove << c.client.id
}
if (time.now().unix - c.client.last_pong_ut) > s.ping_interval * 2 {
clients_to_remove << c.client.id
c.client.close(1000, 'no pong received') or {
continue
}
}
}
}
// TODO replace for with s.clients.delete_all(clients_to_remove) if (https://github.com/vlang/v/pull/6020) merges
for client in clients_to_remove {
lock {
s.clients.delete(client)
}
}
clients_to_remove.clear()
}
}
fn (mut s Server) serve_client(mut c Client) ? {
c.logger.debug('server-> Start serve client ($c.id)')
defer {
c.logger.debug('server-> End serve client ($c.id)')
}
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mut handshake_response, mut server_client := s.handle_server_handshake(mut c)?
accept := s.send_connect_event(mut server_client)?
if !accept {
s.logger.debug('server-> client not accepted')
c.shutdown_socket()?
return
}
// The client is accepted
c.socket_write(handshake_response.bytes())?
lock {
s.clients[server_client.client.id] = server_client
}
s.setup_callbacks(mut server_client)
c.listen() or {
s.logger.error(err)
return error(err)
}
}
fn (mut s Server) setup_callbacks(mut sc ServerClient) {
if s.message_callbacks.len > 0 {
for cb in s.message_callbacks {
if cb.is_ref {
sc.client.on_message_ref(cb.handler2, cb.ref)
} else {
sc.client.on_message(cb.handler)
}
}
}
if s.close_callbacks.len > 0 {
for cb in s.close_callbacks {
if cb.is_ref {
sc.client.on_close_ref(cb.handler2, cb.ref)
} else {
sc.client.on_close(cb.handler)
}
}
}
// Set standard close so we can remove client if closed
sc.client.on_close_ref(fn (mut c Client, code int, reason string, mut sc ServerClient) ? {
c.logger.debug('server-> Delete client')
lock {
sc.server.clients.delete(sc.client.id)
}
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}, sc)
}
fn (mut s Server) accept_new_client() ?&Client {
mut new_conn := s.ls.accept()?
c := &Client{
is_server: true
conn: new_conn
ssl_conn: openssl.new_ssl_conn()
logger: s.logger
state: .open
last_pong_ut: time.now().unix
id: rand.uuid_v4()
}
return c
}
// set_state sets current state in a thread safe way
[inline]
fn (mut s Server) set_state(state State) {
lock {
s.state = state
}
}
pub fn (mut s Server) free() {
unsafe {
s.clients.free()
// s.logger.free()
// s.ls.free()
s.accept_client_callbacks.free()
s.message_callbacks.free()
s.close_callbacks.free()
}
}