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diff --git a/benchmarks/py-locust/files/extra-EXAMPLES-events.py b/benchmarks/py-locust/files/extra-EXAMPLES-events.py
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+# -*- coding: utf-8 -*-
+
+"""
+This is an example of a locustfile that uses Locust's built in event hooks to
+track the sum of the content-length header in all successful HTTP responses
+"""
+
+from locust import HttpLocust, TaskSet, events, task, web
+
+
+class MyTaskSet(TaskSet):
+ @task(2)
+ def index(l):
+ l.client.get("/")
+
+ @task(1)
+ def stats(l):
+ l.client.get("/stats/requests")
+
+class WebsiteUser(HttpLocust):
+ host = "http://127.0.0.1:8089"
+ min_wait = 2000
+ max_wait = 5000
+ task_set = MyTaskSet
+
+
+"""
+We need somewhere to store the stats.
+
+On the master node stats will contain the aggregated sum of all content-lengths,
+while on the slave nodes this will be the sum of the content-lengths since the
+last stats report was sent to the master
+"""
+stats = {"content-length":0}
+
+def on_request_success(request_type, name, response_time, response_length):
+ """
+ Event handler that get triggered on every successful request
+ """
+ stats["content-length"] += response_length
+
+def on_report_to_master(client_id, data):
+ """
+ This event is triggered on the slave instances every time a stats report is
+ to be sent to the locust master. It will allow us to add our extra content-length
+ data to the dict that is being sent, and then we clear the local stats in the slave.
+ """
+ data["content-length"] = stats["content-length"]
+ stats["content-length"] = 0
+
+def on_slave_report(client_id, data):
+ """
+ This event is triggered on the master instance when a new stats report arrives
+ from a slave. Here we just add the content-length to the master's aggregated
+ stats dict.
+ """
+ stats["content-length"] += data["content-length"]
+
+# Hook up the event listeners
+events.request_success += on_request_success
+events.report_to_master += on_report_to_master
+events.slave_report += on_slave_report
+
+@web.app.route("/content-length")
+def total_content_length():
+ """
+ Add a route to the Locust web app, where we can see the total content-length
+ """
+ return "Total content-length recieved: %i" % stats["content-length"]