Created
October 26, 2020 13:31
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| #!/usr/bin/env python | |
| import time | |
| from flask import Flask, render_template, Response | |
| app = Flask(__name__) | |
| @app.route("/") | |
| def index(): | |
| return render_template('index.html') | |
| def get_message(): | |
| '''this could be any function that blocks until data is ready''' | |
| time.sleep(1.0) | |
| s = time.ctime(time.time()) | |
| return s | |
| @app.route('/sse/') | |
| def sse(): | |
| return render_template('sse.html') | |
| @app.route('/stream') | |
| def stream(): | |
| def eventStream(): | |
| while True: | |
| # wait for source data to be available, then push it | |
| yield 'data: {}\n\n'.format(get_message()) | |
| return Response(eventStream(), mimetype="text/event-stream") | |
| if __name__ == "__main__": | |
| app.run() |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script> | |
| var es = new EventSource("{{ url_for('stream') }}"); | |
| es.onmessage = function(e) { | |
| console.log("" + e.data + " from " + e.origin); | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| <h1>SSE test</h1> | |
| </body> | |
| </html> |
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