| 1 | |
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| 2 | |
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| 3 | |
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| 4 | """ |
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| 5 | WebSocket example: echo service. |
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| 6 | |
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| 7 | This creates a simple echo WebSocket example, accessible on |
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| 8 | http://localhost:8080/ with a browser supporting WebSocket. |
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| 9 | """ |
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| 10 | |
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| 11 | import sys |
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| 12 | |
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| 13 | from twisted.python import log |
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| 14 | from twisted.internet import reactor |
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| 15 | from twisted.web.websocket import WebSocketHandler, WebSocketSite |
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| 16 | from twisted.web.resource import Resource |
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| 17 | |
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| 18 | |
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| 19 | |
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| 20 | class Echohandler(WebSocketHandler): |
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| 21 | |
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| 22 | def frameReceived(self, frame): |
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| 23 | log.msg("Received frame '%s'" % frame) |
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| 24 | self.transport.write(frame) |
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| 25 | |
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| 26 | |
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| 27 | |
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| 28 | class ExampleResource(Resource): |
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| 29 | |
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| 30 | def getChildWithDefault(self, path, request): |
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| 31 | if not path: |
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| 32 | return self |
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| 33 | return Resource.getChildWithDefault(self, path, request) |
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| 34 | |
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| 35 | |
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| 36 | def render_GET(self, request): |
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| 37 | return """<html> |
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| 38 | <head> |
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| 39 | <title>WebSocket example: echo service</title> |
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| 40 | </head> |
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| 41 | <body> |
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| 42 | <h1>WebSocket example: echo service</h1> |
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| 43 | <script type="text/javascript"> |
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| 44 | var ws = new WebSocket("ws://127.0.0.1:8080/ws/echo"); |
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| 45 | ws.onmessage = function(evt) { |
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| 46 | var data = evt.data; |
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| 47 | var target = document.getElementById("received"); |
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| 48 | target.value = target.value + data; |
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| 49 | }; |
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| 50 | window.send_data = function() { |
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| 51 | ws.send(document.getElementById("send_input").value); |
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| 52 | }; |
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| 53 | </script> |
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| 54 | <form> |
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| 55 | <label for="send_input">Text to send</label> |
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| 56 | <input type="text" name="send_input" id="send_input"/> |
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| 57 | <input type="submit" name="send_submit" id="send_submit" value="Send" |
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| 58 | onclick="send_data(); return false"/> |
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| 59 | <br /> |
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| 60 | <label for="received">Received text</label> |
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| 61 | <textarea name="received" id="received"></textarea> |
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| 62 | </form> |
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| 63 | </body> |
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| 64 | </html>""" |
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| 65 | |
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| 66 | |
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| 67 | |
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| 68 | def main(): |
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| 69 | log.startLogging(sys.stdout) |
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| 70 | root = ExampleResource() |
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| 71 | site = WebSocketSite(root) |
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| 72 | site.addHandler("/ws/echo", Echohandler) |
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| 73 | reactor.listenTCP(8080, site) |
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| 74 | reactor.run() |
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| 75 | |
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| 76 | |
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| 77 | |
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| 78 | if __name__ == "__main__": |
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| 79 | main() |
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