OVMS3-idf/examples/protocols/websocket/example_test.py

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from __future__ import print_function
from __future__ import unicode_literals
import re
import os
import socket
import select
import hashlib
import base64
import queue
import random
import string
from threading import Thread, Event
import ttfw_idf
def get_my_ip():
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
# doesn't even have to be reachable
s.connect(('10.255.255.255', 1))
IP = s.getsockname()[0]
except Exception:
IP = '127.0.0.1'
finally:
s.close()
return IP
# Simple Websocket server for testing purposes
class Websocket:
HEADER_LEN = 6
def __init__(self, port):
self.port = port
self.socket = socket.socket()
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.settimeout(10.0)
self.send_q = queue.Queue()
self.shutdown = Event()
def __enter__(self):
try:
self.socket.bind(('', self.port))
except socket.error as e:
print("Bind failed:{}".format(e))
raise
self.socket.listen(1)
self.server_thread = Thread(target=self.run_server)
self.server_thread.start()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.shutdown.set()
self.server_thread.join()
self.socket.close()
self.conn.close()
def run_server(self):
self.conn, address = self.socket.accept() # accept new connection
self.socket.settimeout(10.0)
print("Connection from: {}".format(address))
self.establish_connection()
print("WS established")
# Handle connection until client closes it, will echo any data received and send data from send_q queue
self.handle_conn()
def establish_connection(self):
while not self.shutdown.is_set():
try:
# receive data stream. it won't accept data packet greater than 1024 bytes
data = self.conn.recv(1024).decode()
if not data:
# exit if data is not received
raise
if "Upgrade: websocket" in data and "Connection: Upgrade" in data:
self.handshake(data)
return
except socket.error as err:
print("Unable to establish a websocket connection: {}, {}".format(err))
raise
def handshake(self, data):
# Magic string from RFC
MAGIC_STRING = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
headers = data.split("\r\n")
for header in headers:
if "Sec-WebSocket-Key" in header:
client_key = header.split()[1]
if client_key:
resp_key = client_key + MAGIC_STRING
resp_key = base64.standard_b64encode(hashlib.sha1(resp_key.encode()).digest())
resp = "HTTP/1.1 101 Switching Protocols\r\n" + \
"Upgrade: websocket\r\n" + \
"Connection: Upgrade\r\n" + \
"Sec-WebSocket-Accept: {}\r\n\r\n".format(resp_key.decode())
self.conn.send(resp.encode())
def handle_conn(self):
while not self.shutdown.is_set():
r,w,e = select.select([self.conn], [], [], 1)
try:
if self.conn in r:
self.echo_data()
if not self.send_q.empty():
self._send_data_(self.send_q.get())
except socket.error as err:
print("Stopped echoing data: {}".format(err))
raise
def echo_data(self):
header = bytearray(self.conn.recv(self.HEADER_LEN, socket.MSG_WAITALL))
if not header:
# exit if socket closed by peer
return
# Remove mask bit
payload_len = ~(1 << 7) & header[1]
payload = bytearray(self.conn.recv(payload_len, socket.MSG_WAITALL))
if not payload:
# exit if socket closed by peer
return
frame = header + payload
decoded_payload = self.decode_frame(frame)
print("Sending echo...")
self._send_data_(decoded_payload)
def _send_data_(self, data):
frame = self.encode_frame(data)
self.conn.send(frame)
def send_data(self, data):
self.send_q.put(data.encode())
def decode_frame(self, frame):
# Mask out MASK bit from payload length, this len is only valid for short messages (<126)
payload_len = ~(1 << 7) & frame[1]
mask = frame[2:self.HEADER_LEN]
encrypted_payload = frame[self.HEADER_LEN:self.HEADER_LEN + payload_len]
payload = bytearray()
for i in range(payload_len):
payload.append(encrypted_payload[i] ^ mask[i % 4])
return payload
def encode_frame(self, payload):
# Set FIN = 1 and OP_CODE = 1 (text)
header = (1 << 7) | (1 << 0)
frame = bytearray([header])
payload_len = len(payload)
# If payload len is longer than 125 then the next 16 bits are used to encode length
if payload_len > 125:
frame.append(126)
frame.append(payload_len >> 8)
frame.append(0xFF & payload_len)
else:
frame.append(payload_len)
frame += payload
return frame
def test_echo(dut):
dut.expect("WEBSOCKET_EVENT_CONNECTED")
for i in range(0, 10):
dut.expect(re.compile(r"Received=hello (\d)"), timeout=30)
print("All echos received")
def test_recv_long_msg(dut, websocket, msg_len, repeats):
send_msg = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(msg_len))
for _ in range(repeats):
websocket.send_data(send_msg)
recv_msg = ''
while len(recv_msg) < msg_len:
# Filter out color encoding
match = dut.expect(re.compile(r"Received=([a-zA-Z0-9]*).*\n"), timeout=30)[0]
recv_msg += match
if recv_msg == send_msg:
print("Sent message and received message are equal")
else:
raise ValueError("DUT received string do not match sent string, \nexpected: {}\nwith length {}\
\nreceived: {}\nwith length {}".format(send_msg, len(send_msg), recv_msg, len(recv_msg)))
@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_websocket(env, extra_data):
"""
steps:
1. join AP
2. connect to uri specified in the config
3. send and receive data
"""
dut1 = env.get_dut("websocket", "examples/protocols/websocket", dut_class=ttfw_idf.ESP32DUT)
# check and log bin size
binary_file = os.path.join(dut1.app.binary_path, "websocket-example.bin")
bin_size = os.path.getsize(binary_file)
ttfw_idf.log_performance("websocket_bin_size", "{}KB".format(bin_size // 1024))
ttfw_idf.check_performance("websocket_bin_size", bin_size // 1024)
try:
if "CONFIG_WEBSOCKET_URI_FROM_STDIN" in dut1.app.get_sdkconfig():
uri_from_stdin = True
else:
uri = dut1.app.get_sdkconfig()["CONFIG_WEBSOCKET_URI"].strip('"')
uri_from_stdin = False
except Exception:
print('ENV_TEST_FAILURE: Cannot find uri settings in sdkconfig')
raise
# start test
dut1.start_app()
if uri_from_stdin:
server_port = 4455
with Websocket(server_port) as ws:
uri = "ws://{}:{}".format(get_my_ip(), server_port)
print("DUT connecting to {}".format(uri))
dut1.expect("Please enter uri of websocket endpoint", timeout=30)
dut1.write(uri)
test_echo(dut1)
# Message length should exceed DUT's buffer size to test fragmentation, default is 1024 byte
test_recv_long_msg(dut1, ws, 2000, 3)
else:
print("DUT connecting to {}".format(uri))
test_echo(dut1)
if __name__ == '__main__':
test_examples_protocol_websocket()