489 lines
14 KiB
V
489 lines
14 KiB
V
// websocket module implements websocket client and a websocket server
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// attribution: @thecoderr the author of original websocket client
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[manualfree]
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module websocket
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import net
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import net.http
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import net.openssl
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import net.urllib
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import time
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import log
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import rand
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const (
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empty_bytearr = []u8{} // used as empty response to avoid allocation
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)
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// Client represents websocket client
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pub struct Client {
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is_server bool
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mut:
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ssl_conn &openssl.SSLConn // secure connection used when wss is used
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flags []Flag // flags used in handshake
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fragments []Fragment // current fragments
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message_callbacks []MessageEventHandler // all callbacks on_message
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error_callbacks []ErrorEventHandler // all callbacks on_error
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open_callbacks []OpenEventHandler // all callbacks on_open
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close_callbacks []CloseEventHandler // all callbacks on_close
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pub:
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is_ssl bool // true if secure socket is used
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uri Uri // uri of current connection
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id string // unique id of client
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pub mut:
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header http.Header // headers that will be passed when connecting
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conn &net.TcpConn // underlying TCP socket connection
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nonce_size int = 16 // size of nounce used for masking
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panic_on_callback bool // set to true of callbacks can panic
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state State // current state of connection
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logger &log.Log // logger used to log messages
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resource_name string // name of current resource
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last_pong_ut i64 // last time in unix time we got a pong message
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}
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// Flag represents different types of headers in websocket handshake
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enum Flag {
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has_accept // Webs
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has_connection
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has_upgrade
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}
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// State represents the state of the websocket connection.
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pub enum State {
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connecting = 0
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open
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closing
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closed
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}
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// Message represents a whole message combined from 1 to n frames
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pub struct Message {
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pub:
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opcode OPCode // websocket frame type of this message
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payload []u8 // payload of the message
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}
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// OPCode represents the supported websocket frame types
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pub enum OPCode {
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continuation = 0x00
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text_frame = 0x01
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binary_frame = 0x02
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close = 0x08
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ping = 0x09
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pong = 0x0A
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}
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// new_client instance a new websocket client
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pub fn new_client(address string) ?&Client {
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uri := parse_uri(address) ?
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return &Client{
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conn: 0
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is_server: false
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ssl_conn: openssl.new_ssl_conn()
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is_ssl: address.starts_with('wss')
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logger: &log.Log{
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level: .info
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}
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uri: uri
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state: .closed
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id: rand.uuid_v4()
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header: http.new_header()
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}
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}
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// connect connects to remote websocket server
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pub fn (mut ws Client) connect() ? {
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ws.assert_not_connected() ?
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ws.set_state(.connecting)
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ws.logger.info('connecting to host $ws.uri')
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ws.conn = ws.dial_socket() ?
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// Todo: make setting configurable
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ws.conn.set_read_timeout(time.second * 30)
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ws.conn.set_write_timeout(time.second * 30)
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ws.handshake() ?
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ws.set_state(.open)
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ws.logger.info('successfully connected to host $ws.uri')
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ws.send_open_event()
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}
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// listen listens and processes incoming messages
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pub fn (mut ws Client) listen() ? {
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mut log := 'Starting client listener, server($ws.is_server)...'
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ws.logger.info(log)
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unsafe { log.free() }
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defer {
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ws.logger.info('Quit client listener, server($ws.is_server)...')
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if ws.state == .open {
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ws.close(1000, 'closed by client') or {}
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}
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}
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for ws.state == .open {
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msg := ws.read_next_message() or {
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if ws.state in [.closed, .closing] {
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return
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}
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ws.debug_log('failed to read next message: $err')
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ws.send_error_event('failed to read next message: $err')
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return err
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}
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if ws.state in [.closed, .closing] {
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return
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}
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ws.debug_log('got message: $msg.opcode')
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match msg.opcode {
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.text_frame {
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log = 'read: text'
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ws.debug_log(log)
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unsafe { log.free() }
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ws.send_message_event(msg)
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unsafe { msg.free() }
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}
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.binary_frame {
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ws.debug_log('read: binary')
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ws.send_message_event(msg)
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unsafe { msg.free() }
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}
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.ping {
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ws.debug_log('read: ping, sending pong')
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ws.send_control_frame(.pong, 'PONG', msg.payload) or {
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ws.logger.error('error in message callback sending PONG: $err')
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ws.send_error_event('error in message callback sending PONG: $err')
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if ws.panic_on_callback {
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panic(err)
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}
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continue
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}
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if msg.payload.len > 0 {
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unsafe { msg.free() }
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}
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}
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.pong {
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ws.debug_log('read: pong')
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ws.last_pong_ut = time.now().unix
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ws.send_message_event(msg)
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if msg.payload.len > 0 {
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unsafe { msg.free() }
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}
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}
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.close {
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log = 'read: close'
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ws.debug_log(log)
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unsafe { log.free() }
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defer {
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ws.manage_clean_close()
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}
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if msg.payload.len > 0 {
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if msg.payload.len == 1 {
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ws.close(1002, 'close payload cannot be 1 byte') ?
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return error('close payload cannot be 1 byte')
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}
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code := u16(msg.payload[0]) << 8 | u16(msg.payload[1])
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if code in invalid_close_codes {
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ws.close(1002, 'invalid close code: $code') ?
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return error('invalid close code: $code')
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}
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reason := if msg.payload.len > 2 { msg.payload[2..] } else { []u8{} }
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if reason.len > 0 {
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ws.validate_utf_8(.close, reason) ?
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}
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if ws.state !in [.closing, .closed] {
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// sending close back according to spec
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ws.debug_log('close with reason, code: $code, reason: $reason')
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r := reason.bytestr()
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ws.close(code, r) ?
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}
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unsafe { msg.free() }
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} else {
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if ws.state !in [.closing, .closed] {
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ws.debug_log('close with reason, no code')
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// sending close back according to spec
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ws.close(1000, 'normal') ?
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}
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unsafe { msg.free() }
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}
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return
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}
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.continuation {
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ws.logger.error('unexpected opcode continuation, nothing to continue')
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ws.send_error_event('unexpected opcode continuation, nothing to continue')
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ws.close(1002, 'nothing to continue') ?
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return error('unexpected opcode continuation, nothing to continue')
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}
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}
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}
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}
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// manage_clean_close closes connection in a clean websocket way
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fn (mut ws Client) manage_clean_close() {
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ws.send_close_event(1000, 'closed by client')
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}
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// ping sends ping message to server
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pub fn (mut ws Client) ping() ? {
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ws.send_control_frame(.ping, 'PING', []) ?
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}
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// pong sends pong message to server,
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pub fn (mut ws Client) pong() ? {
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ws.send_control_frame(.pong, 'PONG', []) ?
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}
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// write_ptr writes len bytes provided a byteptr with a websocket messagetype
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pub fn (mut ws Client) write_ptr(bytes &u8, payload_len int, code OPCode) ?int {
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// ws.debug_log('write_ptr code: $code')
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if ws.state != .open || ws.conn.sock.handle < 1 {
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// todo: send error here later
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return error('trying to write on a closed socket!')
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}
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mut header_len := 2 + if payload_len > 125 { 2 } else { 0 } +
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if payload_len > 0xffff { 6 } else { 0 }
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if !ws.is_server {
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header_len += 4
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}
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mut header := []u8{len: header_len, init: `0`} // [`0`].repeat(header_len)
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header[0] = u8(int(code)) | 0x80
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masking_key := create_masking_key()
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if ws.is_server {
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if payload_len <= 125 {
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header[1] = u8(payload_len)
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} else if payload_len > 125 && payload_len <= 0xffff {
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len16 := C.htons(payload_len)
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header[1] = 126
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unsafe { C.memcpy(&header[2], &len16, 2) }
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} else if payload_len > 0xffff && payload_len <= 0x7fffffff {
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len_bytes := htonl64(u64(payload_len))
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header[1] = 127
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unsafe { C.memcpy(&header[2], len_bytes.data, 8) }
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}
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} else {
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if payload_len <= 125 {
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header[1] = u8(payload_len | 0x80)
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header[2] = masking_key[0]
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header[3] = masking_key[1]
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header[4] = masking_key[2]
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header[5] = masking_key[3]
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} else if payload_len > 125 && payload_len <= 0xffff {
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len16 := C.htons(payload_len)
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header[1] = (126 | 0x80)
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unsafe { C.memcpy(&header[2], &len16, 2) }
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header[4] = masking_key[0]
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header[5] = masking_key[1]
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header[6] = masking_key[2]
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header[7] = masking_key[3]
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} else if payload_len > 0xffff && payload_len <= 0x7fffffff {
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len64 := htonl64(u64(payload_len))
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header[1] = (127 | 0x80)
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unsafe { C.memcpy(&header[2], len64.data, 8) }
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header[10] = masking_key[0]
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header[11] = masking_key[1]
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header[12] = masking_key[2]
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header[13] = masking_key[3]
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} else {
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ws.close(1009, 'frame too large') ?
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return error('frame too large')
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}
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}
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len := header.len + payload_len
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mut frame_buf := []u8{len: len}
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unsafe {
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C.memcpy(&frame_buf[0], &u8(header.data), header.len)
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if payload_len > 0 {
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C.memcpy(&frame_buf[header.len], bytes, payload_len)
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}
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}
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if !ws.is_server {
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for i in 0 .. payload_len {
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frame_buf[header_len + i] ^= masking_key[i % 4] & 0xff
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}
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}
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written_len := ws.socket_write(frame_buf) ?
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unsafe {
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frame_buf.free()
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masking_key.free()
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header.free()
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}
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return written_len
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}
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// write writes a byte array with a websocket messagetype to socket
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pub fn (mut ws Client) write(bytes []u8, code OPCode) ?int {
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return ws.write_ptr(&u8(bytes.data), bytes.len, code)
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}
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// write_str, writes a string with a websocket texttype to socket
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pub fn (mut ws Client) write_string(str string) ?int {
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return ws.write_ptr(str.str, str.len, .text_frame)
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}
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// close closes the websocket connection
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pub fn (mut ws Client) close(code int, message string) ? {
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ws.debug_log('sending close, $code, $message')
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if ws.state in [.closed, .closing] || ws.conn.sock.handle <= 1 {
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ws.debug_log('close: Websocket allready closed ($ws.state), $message, $code handle($ws.conn.sock.handle)')
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err_msg := 'Socket allready closed: $code'
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return error(err_msg)
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}
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defer {
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ws.shutdown_socket() or {}
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ws.reset_state()
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}
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ws.set_state(.closing)
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// mut code32 := 0
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if code > 0 {
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code_ := C.htons(code)
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message_len := message.len + 2
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mut close_frame := []u8{len: message_len}
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close_frame[0] = u8(code_ & 0xFF)
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close_frame[1] = u8(code_ >> 8)
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// code32 = (close_frame[0] << 8) + close_frame[1]
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for i in 0 .. message.len {
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close_frame[i + 2] = message[i]
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}
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ws.send_control_frame(.close, 'CLOSE', close_frame) ?
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unsafe { close_frame.free() }
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} else {
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ws.send_control_frame(.close, 'CLOSE', []) ?
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}
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ws.fragments = []
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}
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// send_control_frame sends a control frame to the server
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fn (mut ws Client) send_control_frame(code OPCode, frame_typ string, payload []u8) ? {
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ws.debug_log('send control frame $code, frame_type: $frame_typ')
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if ws.state !in [.open, .closing] && ws.conn.sock.handle > 1 {
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return error('socket is not connected')
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}
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header_len := if ws.is_server { 2 } else { 6 }
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frame_len := header_len + payload.len
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mut control_frame := []u8{len: frame_len}
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mut masking_key := if !ws.is_server { create_masking_key() } else { websocket.empty_bytearr }
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defer {
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unsafe {
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control_frame.free()
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if masking_key.len > 0 {
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masking_key.free()
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}
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}
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}
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control_frame[0] = u8(int(code) | 0x80)
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if !ws.is_server {
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control_frame[1] = u8(payload.len | 0x80)
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control_frame[2] = masking_key[0]
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control_frame[3] = masking_key[1]
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control_frame[4] = masking_key[2]
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control_frame[5] = masking_key[3]
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} else {
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control_frame[1] = u8(payload.len)
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}
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if code == .close {
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if payload.len >= 2 {
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if !ws.is_server {
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mut parsed_payload := []u8{len: payload.len + 1}
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unsafe { C.memcpy(parsed_payload.data, &payload[0], payload.len) }
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parsed_payload[payload.len] = `\0`
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for i in 0 .. payload.len {
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control_frame[6 + i] = (parsed_payload[i] ^ masking_key[i % 4]) & 0xff
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}
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unsafe { parsed_payload.free() }
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} else {
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unsafe { C.memcpy(&control_frame[2], &payload[0], payload.len) }
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}
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}
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} else {
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if !ws.is_server {
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if payload.len > 0 {
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for i in 0 .. payload.len {
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control_frame[header_len + i] = (payload[i] ^ masking_key[i % 4]) & 0xff
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}
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}
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} else {
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if payload.len > 0 {
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unsafe { C.memcpy(&control_frame[2], &payload[0], payload.len) }
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}
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}
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}
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ws.socket_write(control_frame) or {
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return error('send_control_frame: error sending $frame_typ control frame.')
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}
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}
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// parse_uri parses the url to a Uri
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fn parse_uri(url string) ?&Uri {
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u := urllib.parse(url) ?
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request_uri := u.request_uri()
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v := request_uri.split('?')
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mut port := u.port()
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uri := u.str()
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if port == '' {
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port = if uri.starts_with('ws://') {
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'80'
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} else if uri.starts_with('wss://') {
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'443'
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} else {
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u.port()
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}
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}
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querystring := if v.len > 1 { '?' + v[1] } else { '' }
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return &Uri{
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url: url
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hostname: u.hostname()
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port: port
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resource: v[0]
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querystring: querystring
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}
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}
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// set_state sets current state of the websocket connection
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fn (mut ws Client) set_state(state State) {
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lock {
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ws.state = state
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}
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}
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// assert_not_connected returns error if the connection is not connected
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fn (ws Client) assert_not_connected() ? {
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match ws.state {
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.connecting { return error('connect: websocket is connecting') }
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.open { return error('connect: websocket already open') }
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.closing { return error('connect: reconnect on closing websocket not supported, please use new client') }
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else {}
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}
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}
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// reset_state resets the websocket and initialize default settings
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fn (mut ws Client) reset_state() {
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lock {
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ws.state = .closed
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ws.ssl_conn = openssl.new_ssl_conn()
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ws.flags = []
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ws.fragments = []
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}
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}
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// debug_log handles debug logging output for client and server
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fn (mut ws Client) debug_log(text string) {
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if ws.is_server {
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ws.logger.debug('server-> $text')
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} else {
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ws.logger.debug('client-> $text')
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}
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}
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// free handles manual free memory of Message struct
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pub fn (m &Message) free() {
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unsafe { m.payload.free() }
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}
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// free handles manual free memory of Client struct
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pub fn (c &Client) free() {
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unsafe {
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c.flags.free()
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c.fragments.free()
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c.message_callbacks.free()
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c.error_callbacks.free()
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c.open_callbacks.free()
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c.close_callbacks.free()
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c.header.free()
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}
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}
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