Easily add all supported connectivity methods to your mbed OS project
Diff: esp8266-driver/TESTS/net/host_tests/tcp_echo.py
- Revision:
- 0:615f90842ce8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/esp8266-driver/TESTS/net/host_tests/tcp_echo.py Wed Jul 12 10:52:58 2017 +0000 @@ -0,0 +1,195 @@ +# Copyright 2015 ARM Limited, All rights reserved +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import sys +import select +import socket +import logging +from threading import Thread +from sys import stdout +from SocketServer import BaseRequestHandler, TCPServer +from mbed_host_tests import BaseHostTest, event_callback + + +class TCPEchoClientHandler(BaseRequestHandler): + def handle(self): + """ + Handles a connection. Test starts by client(i.e. mbed) connecting to server. + This connection handler receives data and echoes back to the client util + {{end}} is received. Then it sits on recv() for client to terminate the + connection. + + Note: reason for not echoing data back after receiving {{end}} is that send + fails raising a SocketError as client closes connection. + """ + while self.server.isrunning(): + try: + data = self.recv() + if not data: break + except Exception as e: + break + + try: + # echo data back to the client + self.send(data) + except Exception as e: + break + + def recv(self): + """ + Try to receive until server is shutdown + """ + while self.server.isrunning(): + rl, wl, xl = select.select([self.request], [], [], 1) + if len(rl): + return self.request.recv(1024) + + def send(self, data): + """ + Try to send until server is shutdown + """ + while self.server.isrunning(): + rl, wl, xl = select.select([], [self.request], [], 1) + if len(wl): + self.request.sendall(data) + break + + +class TCPServerWrapper(TCPServer): + """ + Wrapper over TCP server to implement server initiated shutdown. + Adds a flag:= running that a request handler can check and come out of + recv loop when shutdown is called. + """ + + def __init__(self, addr, request_handler): + # hmm, TCPServer is not sub-classed from object! + if issubclass(TCPServer, object): + super(TCPServerWrapper, self).__init__(addr, request_handler) + else: + TCPServer.__init__(self, addr, request_handler) + self.running = False + + def serve_forever(self): + self.running = True + if issubclass(TCPServer, object): + super(TCPServerWrapper, self).serve_forever() + else: + TCPServer.serve_forever(self) + + def shutdown(self): + self.running = False + if issubclass(TCPServer, object): + super(TCPServerWrapper, self).shutdown() + else: + TCPServer.shutdown(self) + + def isrunning(self): + return self.running + + +class TCPEchoClientTest(BaseHostTest): + + def __init__(self): + """ + Initialise test parameters. + + :return: + """ + BaseHostTest.__init__(self) + self.SERVER_IP = None # Will be determined after knowing the target IP + self.SERVER_PORT = 0 # Let TCPServer choose an arbitrary port + self.server = None + self.server_thread = None + self.target_ip = None + + @staticmethod + def find_interface_to_target_addr(target_ip): + """ + Finds IP address of the interface through which it is connected to the target. + + :return: + """ + s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) + try: + s.connect((target_ip, 0)) # Target IP, any port + except socket.error: + s.connect((target_ip, 8000)) # Target IP, 'random' port + ip = s.getsockname()[0] + s.close() + return ip + + def setup_tcp_server(self): + """ + sets up a TCP server for target to connect and send test data. + + :return: + """ + # !NOTE: There should mechanism to assert in the host test + if self.SERVER_IP is None: + self.log("setup_tcp_server() called before determining server IP!") + self.notify_complete(False) + + # Returning none will suppress host test from printing success code + self.server = TCPServerWrapper((self.SERVER_IP, self.SERVER_PORT), TCPEchoClientHandler) + ip, port = self.server.server_address + self.SERVER_PORT = port + self.server.allow_reuse_address = True + self.log("HOST: Listening for TCP connections: " + self.SERVER_IP + ":" + str(self.SERVER_PORT)) + self.server_thread = Thread(target=TCPEchoClientTest.server_thread_func, args=(self,)) + self.server_thread.start() + + @staticmethod + def server_thread_func(this): + """ + Thread function to run TCP server forever. + + :param this: + :return: + """ + this.server.serve_forever() + + @event_callback("target_ip") + def _callback_target_ip(self, key, value, timestamp): + """ + Callback to handle reception of target's IP address. + + :param key: + :param value: + :param timestamp: + :return: + """ + self.target_ip = value + self.SERVER_IP = self.find_interface_to_target_addr(self.target_ip) + self.setup_tcp_server() + + @event_callback("host_ip") + def _callback_host_ip(self, key, value, timestamp): + """ + Callback for request for host IP Addr + + """ + self.send_kv("host_ip", self.SERVER_IP) + + @event_callback("host_port") + def _callback_host_port(self, key, value, timestamp): + """ + Callback for request for host port + """ + self.send_kv("host_port", self.SERVER_PORT) + + def teardown(self): + if self.server: + self.server.shutdown() + self.server_thread.join()