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import datetime, socket, ssl, time, typing
from src import IRCLine, Logging, IRCObject, utils
THROTTLE_LINES = 4
THROTTLE_SECONDS = 1
UNTHROTTLED_MAX_LINES = 10
class Socket(IRCObject.Object):
def __init__(self, log: Logging.Log, encoding: str, fallback_encoding: str,
hostname: str, port: int, ipv4: bool, bindhost: str, tls: bool,
tls_verify: bool=True, cert: str=None, key: str=None):
self.log = log
self._encoding = encoding
self._fallback_encoding = fallback_encoding
self._hostname = hostname
self._port = port
self._ipv4 = ipv4
self._bindhost = bindhost
self._tls = tls
self._tls_verify = tls_verify
self._cert = cert
self._key = key
self.connected = False
self._write_buffer = b""
self._queued_lines = [] # type: typing.List[IRCLine.SentLine]
self._buffered_lines = [] # type: typing.List[IRCLine.SentLine]
self._write_throttling = False
self._read_buffer = b""
self._recent_sends = [] # type: typing.List[float]
self.cached_fileno = None # type: typing.Optional[int]
self.bytes_written = 0
self.bytes_read = 0
self.last_read = time.monotonic()
self.last_send = None # type: typing.Optional[float]
self.connected_ip = None
def fileno(self) -> int:
return self.cached_fileno or self._socket.fileno()
def _tls_wrap(self):
server_hostname = None
if not utils.is_ip(self._hostname):
server_hostname = self._hostname
self._socket = utils.security.ssl_wrap(self._socket,
cert=self._cert, key=self._key, verify=self._tls_verify,
hostname=server_hostname)
def connect(self):
family = socket.AF_INET if self._ipv4 else socket.AF_INET6
self._socket = socket.socket(family, socket.SOCK_STREAM)
self._socket.settimeout(5.0)
if self._bindhost:
self._socket.bind((self._bindhost, 0))
if self._tls:
self._tls_wrap()
self._socket.connect((self._hostname, self._port))
self.connected_ip = self._socket.getpeername()[0]
self.cached_fileno = self._socket.fileno()
self.connected = True
def disconnect(self):
self.connected = False
try:
self._socket.shutdown(socket.SHUT_RDWR)
except:
pass
try:
self._socket.close()
except:
pass
def read(self) -> typing.Optional[typing.List[str]]:
data = b""
try:
data = self._socket.recv(4096)
except (ConnectionResetError, socket.timeout, OSError):
self.disconnect()
return None
if not data:
self.disconnect()
return None
self.bytes_read += len(data)
data = self._read_buffer+data
self._read_buffer = b""
data_lines = [line.strip(b"\r") for line in data.split(b"\n")]
if data_lines[-1]:
self._read_buffer = data_lines[-1]
self.log.trace("recevied and buffered non-complete line: %s",
[data_lines[-1]])
data_lines.pop(-1)
decoded_lines = []
for line in data_lines:
try:
decoded_line = line.decode(self._encoding)
except:
self.log.trace("can't decode line with '%s', falling back",
[self._encoding])
try:
decoded_line = line.decode(self._fallback_encoding)
except:
continue
decoded_lines.append(decoded_line)
self.last_read = time.monotonic()
return decoded_lines
def send(self, line: IRCLine.SentLine):
self._queued_lines.append(line)
def _send(self) -> typing.List[IRCLine.ParsedLine]:
sent_lines = []
throttle_space = self.throttle_space()
if throttle_space:
to_buffer = self._queued_lines[:throttle_space]
self._queued_lines = self._queued_lines[throttle_space:]
for line in to_buffer:
sent_lines.append(line.parsed_line)
self._write_buffer += line.data()
self._buffered_lines.append(line)
bytes_written_i = self._socket.send(self._write_buffer)
bytes_written = self._write_buffer[:bytes_written_i]
lines_sent = bytes_written.count(b"\r\n")
for i in range(lines_sent):
self._buffered_lines.pop(0).sent()
self._write_buffer = self._write_buffer[bytes_written_i:]
self.bytes_written += bytes_written_i
now = time.monotonic()
self._recent_sends.append(now)
self.last_send = now
return sent_lines
def clear_send_buffer(self):
self._queued_lines.clear()
def waiting_send(self) -> bool:
return bool(len(self._write_buffer)) or bool(len(self._queued_lines))
def throttle_done(self) -> bool:
return self.send_throttle_timeout() == 0
def throttle_prune(self):
now = time.monotonic()
popped = 0
for i, recent_send in enumerate(self._recent_sends[:]):
time_since = now-recent_send
if time_since >= THROTTLE_SECONDS:
self._recent_sends.pop(i-popped)
popped += 1
def throttle_space(self) -> int:
if not self._write_throttling:
return UNTHROTTLED_MAX_LINES
return max(0, THROTTLE_LINES-len(self._recent_sends))
def send_throttle_timeout(self) -> float:
if len(self._write_buffer) or not self._write_throttling:
return 0
self.throttle_prune()
if self.throttle_space() > 0:
return 0
time_left = self._recent_sends[0]+THROTTLE_SECONDS
time_left = time_left-time.monotonic()
return time_left
def set_write_throttling(self, is_on: bool):
self._write_throttling = is_on
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