v/vlib/net/websocket/ws.v

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module websocket
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import net
import net.urllib
import encoding.base64
import eventbus
import sync
import net.websocket.logger
const (
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l = logger.new('ws')
)
pub struct Client {
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retry int
eb &eventbus.EventBus
is_ssl bool
// subprotocol_len int
// cwebsocket_subprotocol *subprotocol;
// cwebsocket_subprotocol *subprotocols[];
mut:
mtx &sync.Mutex = sync.new_mutex()
write_lock &sync.Mutex = sync.new_mutex()
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state State
socket net.Socket
flags []Flag
sslctx &C.SSL_CTX
ssl &C.SSL
fragments []Fragment
pub mut:
uri string
subscriber &eventbus.Subscriber
nonce_size int = 18 // you can try 16 too
}
struct Fragment {
data voidptr
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len u64
code OPCode
}
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pub struct Message {
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pub:
opcode OPCode
payload voidptr
payload_len int
}
pub enum OPCode {
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continuation = 0x00
text_frame = 0x01
binary_frame = 0x02
close = 0x08
ping = 0x09
pong = 0x0A
}
enum State {
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connecting = 0
connected
open
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closing
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closed
}
struct Uri {
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mut:
hostname string
port string
resource string
querystring string
}
enum Flag {
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has_accept
has_connection
has_upgrade
}
struct Frame {
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mut:
fin bool
rsv1 bool
rsv2 bool
rsv3 bool
opcode OPCode
mask bool
payload_len u64
masking_key [4]byte
}
pub fn new(uri string) &Client {
eb := eventbus.new()
ws := &Client{
uri: uri
state: .closed
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eb: eb
subscriber: eb.subscriber
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is_ssl: uri.starts_with('wss')
ssl: 0
sslctx: 0
}
return ws
}
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fn (ws &Client) parse_uri() &Uri {
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u := urllib.parse(ws.uri) or {
panic(err)
}
v := u.request_uri().split('?')
querystring := if v.len > 1 { '?' + v[1] } else { '' }
return &Uri{
hostname: u.hostname()
port: u.port()
resource: v[0]
querystring: querystring
}
}
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pub fn (mut ws Client) connect() int {
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match ws.state {
.connected {
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l.f('connect: websocket already connected')
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}
.connecting {
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l.f('connect: websocket already connecting')
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}
.open {
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l.f('connect: websocket already open')
}
else {
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// do nothing
}
}
ws.mtx.m_lock()
ws.state = .connecting
ws.mtx.unlock()
uri := ws.parse_uri()
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nonce := get_nonce(ws.nonce_size)
seckey := base64.encode(nonce)
ai_family := C.AF_INET
ai_socktype := C.SOCK_STREAM
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l.d('handshake header:')
handshake := 'GET ${uri.resource}${uri.querystring} HTTP/1.1\r\nHost: ${uri.hostname}:${uri.port}\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Key: ${seckey}\r\nSec-WebSocket-Version: 13\r\n\r\n'
l.d(handshake)
socket := net.new_socket(ai_family, ai_socktype, 0) or {
l.f(err)
return -1
}
ws.socket = socket
ws.socket.connect(uri.hostname, uri.port.int()) or {
l.f(err)
return -1
}
optval := 1
ws.socket.setsockopt(C.SOL_SOCKET, C.SO_KEEPALIVE, &optval) or {
l.f(err)
return -1
}
if ws.is_ssl {
ws.connect_ssl()
}
ws.mtx.m_lock()
ws.state = .connected
ws.mtx.unlock()
res := ws.write_to_server(handshake.str, handshake.len)
if res <= 0 {
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l.f('Handshake failed.')
}
ws.read_handshake(seckey)
ws.mtx.m_lock()
ws.state = .open
ws.mtx.unlock()
ws.send_open_event()
unsafe {
handshake.free()
nonce.free()
free(uri)
}
return 0
}
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pub fn (mut ws Client) close(code int, message string) {
if ws.state != .closed && ws.socket.sockfd > 1 {
ws.mtx.m_lock()
ws.state = .closing
ws.mtx.unlock()
mut code32 := 0
if code > 0 {
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code_ := C.htons(code)
message_len := message.len + 2
mut close_frame := [`0`].repeat(message_len)
close_frame[0] = byte(code_ & 0xFF)
close_frame[1] = byte(code_ >> 8)
code32 = (close_frame[0] << 8) + close_frame[1]
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for i in 0 .. message.len {
close_frame[i + 2] = message[i]
}
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ws.send_control_frame(.close, 'CLOSE', close_frame)
} else {
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ws.send_control_frame(.close, 'CLOSE', [])
}
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if ws.ssl != 0 {
C.SSL_shutdown(ws.ssl)
C.SSL_free(ws.ssl)
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if ws.sslctx != 0 {
C.SSL_CTX_free(ws.sslctx)
}
} else {
if C.shutdown(ws.socket.sockfd, C.SHUT_WR) == -1 {
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l.e('Unabled to shutdown websocket.')
}
mut buf := [`0`]
for ws.read_from_server(buf.data, 1) > 0 {
buf[0] = `\0`
}
unsafe {
buf.free()
}
if C.close(ws.socket.sockfd) == -1 {
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// ws.send_close_event()(websocket, 1011, strerror(C.errno));
}
}
ws.fragments = []
ws.send_close_event()
ws.mtx.m_lock()
ws.state = .closed
ws.mtx.unlock()
unsafe {
}
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// TODO impl autoreconnect
}
}
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pub fn (mut ws Client) write(payload byteptr, payload_len int, code OPCode) int {
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mut bytes_written := -1
if ws.state != .open {
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ws.send_error_event('WebSocket closed. Cannot write.')
unsafe {
free(payload)
}
return -1
}
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header_len := 6 + if payload_len > 125 { 2 } else { 0 } + if payload_len > 0xffff { 6 } else { 0 }
frame_len := header_len + payload_len
mut frame_buf := [`0`].repeat(frame_len)
fbdata := byteptr( frame_buf.data )
masking_key := create_masking_key()
mut header := [`0`].repeat(header_len)
header[0] = byte(code) | 0x80
if payload_len <= 125 {
header[1] = byte(payload_len | 0x80)
header[2] = masking_key[0]
header[3] = masking_key[1]
header[4] = masking_key[2]
header[5] = masking_key[3]
} else if payload_len > 125 && payload_len <= 0xffff {
len16 := C.htons(payload_len)
header[1] = (126 | 0x80)
unsafe {
C.memcpy(header.data + 2, &len16, 2)
}
header[4] = masking_key[0]
header[5] = masking_key[1]
header[6] = masking_key[2]
header[7] = masking_key[3]
} else if payload_len > 0xffff && payload_len <= 0xffffffffffffffff { // 65535 && 18446744073709551615
len64 := htonl64(u64(payload_len))
header[1] = (127 | 0x80)
unsafe {
C.memcpy(header.data + 2, len64, 8)
}
header[10] = masking_key[0]
header[11] = masking_key[1]
header[12] = masking_key[2]
header[13] = masking_key[3]
} else {
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l.c('write: frame too large')
ws.close(1009, 'frame too large')
goto free_data
return -1
}
unsafe
{
C.memcpy(fbdata, header.data, header_len)
C.memcpy(fbdata + header_len, payload, payload_len)
}
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for i in 0 .. payload_len {
frame_buf[header_len + i] ^= masking_key[i % 4] & 0xff
}
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bytes_written = ws.write_to_server(fbdata, frame_len)
if bytes_written == -1 {
err := string(byteptr(C.strerror(C.errno)))
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l.e('write: there was an error writing data: ${err}')
ws.send_error_event('Error writing data')
goto free_data
return -1
}
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l.d('write: ${bytes_written} bytes written.')
free_data:
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unsafe {
free(payload)
frame_buf.free()
header.free()
masking_key.free()
}
return bytes_written
}
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pub fn (mut ws Client) listen() {
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l.i('Starting listener...')
for ws.state == .open {
ws.read()
}
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l.i('Listener stopped as websocket was closed.')
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}
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pub fn (mut ws Client) read() int {
mut bytes_read := u64(0)
initial_buffer := u64(256)
mut header_len := 2
header_len_offset := 2
extended_payload16_end_byte := 4
extended_payload64_end_byte := 10
mut payload_len := u64(0)
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mut data := C.calloc(initial_buffer, 1) // [`0`].repeat(int(max_buffer))
mut frame := Frame{}
mut frame_size := u64(header_len)
for bytes_read < frame_size && ws.state == .open {
mut byt := 0
unsafe {
byt = ws.read_from_server(data + int(bytes_read), 1)
}
match byt {
0 {
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error := 'server closed the connection.'
l.e('read: ${error}')
ws.send_error_event(error)
ws.close(1006, error)
goto free_data
return -1
}
-1 {
err := string(byteptr(C.strerror(C.errno)))
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l.e('read: error reading frame. ${err}')
ws.send_error_event('error reading frame')
goto free_data
return -1
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}
else {
bytes_read++
}
}
if bytes_read == u64(header_len_offset) {
frame.fin = (data[0] & 0x80) == 0x80
frame.rsv1 = (data[0] & 0x40) == 0x40
frame.rsv2 = (data[0] & 0x20) == 0x20
frame.rsv3 = (data[0] & 0x10) == 0x10
frame.opcode = OPCode(int(data[0] & 0x7F))
frame.mask = (data[1] & 0x80) == 0x80
frame.payload_len = u64(data[1] & 0x7F)
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// masking key
if frame.mask {
frame.masking_key[0] = data[2]
frame.masking_key[1] = data[3]
frame.masking_key[2] = data[4]
frame.masking_key[3] = data[5]
}
payload_len = frame.payload_len
frame_size = u64(header_len) + payload_len
}
if frame.payload_len == u64(126) && bytes_read == u64(extended_payload16_end_byte) {
header_len += 2
mut extended_payload_len := 0
extended_payload_len |= data[2] << 8
extended_payload_len |= data[3] << 0
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// masking key
if frame.mask {
frame.masking_key[0] = data[4]
frame.masking_key[1] = data[5]
frame.masking_key[2] = data[6]
frame.masking_key[3] = data[7]
}
payload_len = u64(extended_payload_len)
frame_size = u64(header_len) + payload_len
if frame_size > initial_buffer {
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l.d('reallocating: ${frame_size}')
data = C.realloc(data, frame_size)
}
} else if frame.payload_len == u64(127) && bytes_read == u64(extended_payload64_end_byte) {
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header_len += 8 // TODO Not sure...
mut extended_payload_len := u64(0)
extended_payload_len |= u64(data[2]) << 56
extended_payload_len |= u64(data[3]) << 48
extended_payload_len |= u64(data[4]) << 40
extended_payload_len |= u64(data[5]) << 32
extended_payload_len |= u64(data[6]) << 24
extended_payload_len |= u64(data[7]) << 16
extended_payload_len |= u64(data[8]) << 8
extended_payload_len |= u64(data[9]) << 0
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// masking key
if frame.mask {
frame.masking_key[0] = data[10]
frame.masking_key[1] = data[11]
frame.masking_key[2] = data[12]
frame.masking_key[3] = data[13]
}
payload_len = extended_payload_len
frame_size = u64(header_len) + payload_len
if frame_size > initial_buffer {
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l.d('reallocating: ${frame_size}')
data = C.realloc(data, frame_size)
}
}
}
// unmask the payload
if frame.mask {
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for i in 0 .. payload_len {
data[header_len + i] ^= frame.masking_key[i % 4] & 0xff
}
}
if ws.fragments.len > 0 && frame.opcode in [.text_frame, .binary_frame] {
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ws.close(0, '')
goto free_data
return -1
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} else if frame.opcode in [.text_frame, .binary_frame] {
data_node:
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l.d('read: recieved text_frame or binary_frame')
mut payload := malloc(int(sizeof(byte) * u32(payload_len) + 1))
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if payload == 0 {
l.f('out of memory')
}
C.memcpy(payload, &data[header_len], payload_len)
if frame.fin {
if ws.fragments.len > 0 {
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// join fragments
ws.fragments << Fragment{
data: payload
len: payload_len
}
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mut frags := []Fragment{}
mut size := u64(0)
for f in ws.fragments {
if f.len > 0 {
frags << f
size += f.len
}
}
mut pl := malloc(int(sizeof(byte) * u32(size)))
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if pl == 0 {
l.f('out of memory')
}
mut by := 0
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for f in frags {
unsafe {
C.memcpy(pl + by, f.data, f.len)
}
by += int(f.len)
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unsafe {
free(f.data)
}
}
payload = pl
frame.opcode = ws.fragments[0].code
payload_len = size
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// clear the fragments
unsafe {
ws.fragments.free()
}
ws.fragments = []
}
payload[payload_len] = `\0`
if frame.opcode == .text_frame && payload_len > 0 {
if !utf8_validate(payload, int(payload_len)) {
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l.e('malformed utf8 payload')
ws.send_error_event('Recieved malformed utf8.')
ws.close(1007, 'malformed utf8 payload')
goto free_data
return -1
}
}
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message := Message{
opcode: frame.opcode
payload: payload
payload_len: int(payload_len)
}
ws.send_message_event(message)
} else {
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// fragment start.
ws.fragments << Fragment{
data: payload
len: payload_len
code: frame.opcode
}
}
unsafe {
free(data)
}
return int(bytes_read)
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} else if frame.opcode == .continuation {
l.d('read: continuation')
if ws.fragments.len <= 0 {
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l.e('Nothing to continue.')
ws.close(1002, 'nothing to continue')
goto free_data
return -1
}
goto data_node
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return 0
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} else if frame.opcode == .ping {
l.d('read: ping')
if !frame.fin {
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ws.close(1002, 'control message must not be fragmented')
goto free_data
return -1
}
if frame.payload_len > 125 {
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ws.close(1002, 'control frames must not exceed 125 bytes')
goto free_data
return -1
}
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mut payload := []byte{}
if payload_len > 0 {
payload = [`0`].repeat(int(payload_len))
C.memcpy(payload.data, &data[header_len], payload_len)
}
unsafe {
free(data)
}
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return ws.send_control_frame(.pong, 'PONG', payload)
} else if frame.opcode == .pong {
if !frame.fin {
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ws.close(1002, 'control message must not be fragmented')
goto free_data
return -1
}
unsafe {
free(data)
}
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// got pong
return 0
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} else if frame.opcode == .close {
l.d('read: close')
if frame.payload_len > 125 {
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ws.close(1002, 'control frames must not exceed 125 bytes')
goto free_data
return -1
}
mut code := 0
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mut reason := ''
if payload_len > 2 {
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code = (int(data[header_len]) << 8) + int(data[header_len + 1])
header_len += 2
payload_len -= 2
reason = string(&data[header_len])
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l.i('Closing with reason: ${reason} & code: ${code}')
if reason.len > 1 && !utf8_validate(reason.str, reason.len) {
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l.e('malformed utf8 payload')
ws.send_error_event('Recieved malformed utf8.')
ws.close(1007, 'malformed utf8 payload')
goto free_data
return -1
}
}
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unsafe {
free(data)
}
ws.close(code, reason)
return 0
}
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l.e('read: Recieved unsupported opcode: ${frame.opcode} fin: ${frame.fin} uri: ${ws.uri}')
ws.send_error_event('Recieved unsupported opcode: ${frame.opcode}')
ws.close(1002, 'Unsupported opcode')
free_data:
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unsafe {
free(data)
}
return -1
}
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fn (mut ws Client) send_control_frame(code OPCode, frame_typ string, payload []byte) int {
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mut bytes_written := -1
if ws.socket.sockfd <= 0 {
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l.e('No socket opened.')
unsafe {
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payload.free()
}
l.c('send_control_frame: error sending ${frame_typ} control frame.')
return -1
}
header_len := 6
frame_len := header_len + payload.len
mut control_frame := [`0`].repeat(frame_len)
masking_key := create_masking_key()
control_frame[0] = byte(code | 0x80)
control_frame[1] = byte(payload.len | 0x80)
control_frame[2] = masking_key[0]
control_frame[3] = masking_key[1]
control_frame[4] = masking_key[2]
control_frame[5] = masking_key[3]
if code == .close {
if payload.len > 2 {
mut parsed_payload := [`0`].repeat(payload.len + 1)
C.memcpy(parsed_payload.data, &payload[0], payload.len)
parsed_payload[payload.len] = `\0`
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for i in 0 .. payload.len {
control_frame[6 + i] = (parsed_payload[i] ^ masking_key[i % 4]) & 0xff
}
unsafe {
parsed_payload.free()
}
}
} else {
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for i in 0 .. payload.len {
control_frame[header_len + i] = (payload[i] ^ masking_key[i % 4]) & 0xff
}
}
bytes_written = ws.write_to_server(control_frame.data, frame_len)
free_data:
unsafe {
control_frame.free()
payload.free()
masking_key.free()
}
match bytes_written {
0 {
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l.d('send_control_frame: remote host closed the connection.')
return 0
}
-1 {
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l.c('send_control_frame: error sending ${frame_typ} control frame.')
return -1
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}
else {
l.d('send_control_frame: wrote ${bytes_written} byte ${frame_typ} frame.')
return bytes_written
}
}
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}