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from typing import TypeVar, Any
import logging
import sys
import socket
import threading
import json
import time
# python2 backwards compatibility for errors
if sys.version_info[0] < 3:
class ConnectionError(BaseException):
pass
try:
import netifaces
TOBII_DISCOVERY_ALLOWED = True
except:
TOBII_DISCOVERY_ALLOWED = False
try:
from urllib.parse import urlparse, urlencode
from urllib.request import urlopen, Request
from urllib.error import URLError, HTTPError
except ImportError:
from urlparse import urlparse
from urllib import urlencode
from urllib2 import urlopen, Request, HTTPError, URLError
socket.IPPROTO_IPV6 = 41
Socket = TypeVar('socket', bound="socket")
# Type definition for type annotation convenience
class TobiiNetworkInterface():
"""Handle network connection to Tobii glasses Pro 2 device.
It is a major rewrite of [tobiiglassesctrl/controller.py](https://github.com/ddetommaso/TobiiGlassesPyController/blob/master/tobiiglassesctrl/controller.py)."""
def __init__(self, address = None):
self.udpport = 49152
self.address = address
self.iface_name = None
if self.address is None:
data, address = self.__discover_device()
if address is None:
raise ConnectionError("No device found using discovery process")
else:
try:
self.address = data["ipv4"]
except:
self.address = address
if "%" in self.address:
if sys.platform == "win32":
self.address,self.iface_name = self.address.split("%")
else:
self.iface_name = self.address.split("%")[1]
if ':' in self.address:
self.base_url = 'http://[%s]' % self.address
else:
self.base_url = 'http://' + self.address
self.__peer = (self.address, self.udpport)
def make_socket(self) -> Socket:
"""Create a socket to enable network communication."""
iptype = socket.AF_INET
if ':' in self.__peer[0]:
iptype = socket.AF_INET6
res = socket.getaddrinfo(self.__peer[0], self.__peer[1], socket.AF_UNSPEC, socket.SOCK_DGRAM, 0, socket.AI_PASSIVE)
family, socktype, proto, canonname, sockaddr = res[0]
new_socket = socket.socket(family, socktype, proto)
new_socket.settimeout(5.0)
try:
if iptype == socket.AF_INET6:
new_socket.setsockopt(socket.SOL_SOCKET, 25, 1)
except socket.error as e:
if e.errno == 1:
logging.warning("Binding to a network interface is permitted only for root users.")
return new_socket
def __discover_device(self):
if TOBII_DISCOVERY_ALLOWED == False:
logging.error("Device discovery is not available due to a missing dependency (netifaces)")
exit(1)
MULTICAST_ADDR = 'ff02::1'
PORT = 13006
for i in netifaces.interfaces():
if netifaces.AF_INET6 in netifaces.ifaddresses(i).keys():
if "%" in netifaces.ifaddresses(i)[netifaces.AF_INET6][0]['addr']:
if_name = netifaces.ifaddresses(i)[netifaces.AF_INET6][0]['addr'].split("%")[1]
if_idx = socket.getaddrinfo(MULTICAST_ADDR + "%" + if_name, PORT, socket.AF_INET6, socket.SOCK_DGRAM)[0][4][3]
s6 = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s6.settimeout(30.0)
s6.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, if_idx)
s6.bind(('::', PORT))
PORT_OUT = PORT if sys.platform == 'win32' or sys.platform == 'darwin' else PORT + 1
try:
# Sending discover request
discover_json = '{"type":"discover"}'
s6.sendto(discover_json.encode('utf-8'), (MULTICAST_ADDR, PORT_OUT))
# Waiting for a reponse from the device ...
data, address = s6.recvfrom(1024)
jdata = json.loads(data.decode('utf-8'))
addr = address[0]
if sys.version_info.major == 3 and sys.version_info.minor >= 8:
addr = address[0] + '%' + if_name
return (jdata, addr)
except:
# No device found on interface
pass
return (None, None)
def get_request(self, api_action) -> str:
"""Send a GET request and get data back."""
url = self.base_url + api_action
res = urlopen(url).read()
try:
data = json.loads(res.decode('utf-8'))
except json.JSONDecodeError:
data = None
return data
def post_request(self, api_action, data=None, wait_for_response=True) -> str:
"""Send a POST request and get result back."""
url = self.base_url + api_action
req = Request(url)
req.add_header('Content-Type', 'application/json')
data = json.dumps(data)
logging.debug("Sending JSON: " + str(data))
if wait_for_response is False:
threading.Thread(target=urlopen, args=(req, data.encode('utf-8'),)).start()
return None
response = urlopen(req, data.encode('utf-8'))
res = response.read()
logging.debug("Response: " + str(res))
try:
res = json.loads(res.decode('utf-8'))
except:
pass
return res
def send_keep_alive_msg(self, socket, msg):
"""Send a message to keep socket opened."""
res = socket.sendto(msg.encode('utf-8'), self.__peer)
def grab_data(self, socket) -> bytes:
"""Read incoming socket data."""
try:
data, address = socket.recvfrom(1024)
return data
except TimeoutError:
logging.error("A timeout occurred while receiving data")
def wait_for_status(self, api_action, key, values, timeout = None) -> Any:
"""Wait until a status matches given values."""
url = self.base_url + api_action
running = True
while running:
req = Request(url)
req.add_header('Content-Type', 'application/json')
try:
response = urlopen(req, None, timeout = timeout)
except URLError as e:
logging.error(e.reason)
return -1
data = response.read()
json_data = json.loads(data.decode('utf-8'))
if json_data[key] in values:
running = False
time.sleep(1)
return json_data[key]
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