fourdollars · October 26, 2020 13:31 · Oct 26, 2020
diff --git a/app.py b/app.py
@@ -0,0 +1,31 @@
+#!/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()
diff --git a/sse.html b/sse.html
@@ -0,0 +1,15 @@
+<!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>