Events API example webhook no longer works with Flask 3.0

[kohlschuetter]

Tested with py3-flask-3.0.3-r0 from Alpine Linux:

Running the Events API example webhook (see https://docs.gluster.org/en/main/Administrator-Guide/Events-APIs/#webhooks) with

gluster-eventsapi webhook-test http://192.168.122.188:9000/listen

results in a NOT OK: 415 status

This is due to flask now failing with a 415 error ("Unsupported media type"), due to "request.json" throwing an exception instead of simply returning None.

Fix: wrap request.json in a try-except statement:

from flask import Flask, request

app = Flask(__name__)

@app.route("/listen", methods=["POST"])
def events_listener():
    try:
        gluster_event = request.json
    except:
        gluster_event = None

    if gluster_event is None:
        # No event to process, may be test call
        return "OK"

    # Process gluster_event
    # {
    #  "nodeid": NODEID,
    #  "ts": EVENT_TIMESTAMP,
    #  "event": EVENT_TYPE,
    #  "message": EVENT_DATA
    # }
    print (gluster_event)
    return "OK"

app.run(host="0.0.0.0", port=9000)

Note that regular events are still handled OK by the original script. Maybe the webhook-test code should just specify a well-formed event JSON object, with a specific event type, e.g., WEBHOOK_TEST. This would also help simplifying real servers ...