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Simple WebSocket Client-Server Example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>WebSocket demo</title> | |
| </head> | |
| <body> | |
| <script> | |
| var messages = document.createElement('ul'); | |
| function output(msg){ | |
| var messages = document.getElementsByTagName('ul')[0]; | |
| message = document.createElement('li'); | |
| content = document.createTextNode(msg); | |
| message.appendChild(content); | |
| messages.appendChild(message); | |
| } | |
| function main(){ | |
| var ws = new WebSocket("ws://127.0.0.1:5678/"); | |
| ws.onclose = function(){ | |
| console.log("attempting again...") | |
| setTimeout(main, 3333); | |
| } | |
| ws.onmessage = function (event) { | |
| output("1st handler msg: " + event.data); | |
| ws.onmessage = function (myevent){ | |
| output("2nd handler msg: " + myevent.data); | |
| } | |
| } | |
| ws.onopen = function () { | |
| ws.send("getCompetence") | |
| } | |
| } | |
| document.body.appendChild(messages); | |
| main(); | |
| </script> | |
| </body> | |
| </html> |
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| #!/usr/bin/python3 | |
| import asyncio | |
| import random | |
| import websockets | |
| import json | |
| async def time(websocket, path): | |
| while True: | |
| msg = await websocket.recv() | |
| res = get_competence() | |
| if msg == "getCompetence": | |
| await websocket.send(res) | |
| myJson = json.loads(res) | |
| while True: | |
| print("inside") | |
| await asyncio.sleep(random.random() * 5) | |
| await websocket.send(random_generator(myJson.keys())) | |
| def get_competence(): | |
| with open('competence1.json','r') as f: | |
| return f.read() | |
| def random_generator(keys): | |
| reslen = random.randint(0,len(keys)-1) | |
| res = [random_val(keys) for x in range(0,reslen)] | |
| return json.dumps(res) | |
| def random_val(keys): | |
| res = {} | |
| res["value"] = random.randint(1,5) | |
| res["anomaly"] = random.randrange(100) < 10 | |
| res["id"] = random.choice(list(keys)) | |
| return res | |
| if __name__ == "__main__": | |
| start_server = websockets.serve(time, '127.0.0.1', 5678) | |
| asyncio.get_event_loop().run_until_complete(start_server) | |
| asyncio.get_event_loop().run_forever() |
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