matrix-rust-sdk/contrib/mitmproxy/failures.py

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"""
A mitmproxy script that introduces certain request failures in a deterministic
way.
Used mainly for Matrix style requests.
To run execute it with mitmproxy:
>>> mitmproxy -s failures.py`
"""
import time
import json
import random
from mitmproxy import http
from mitmproxy.script import concurrent
REQUEST_COUNT = 0
def timeout(flow):
timeout = 60 if "sync" in flow.request.pretty_url else 30
time.sleep(timeout)
return None
# A map holding our failure modes.
# The keys are just descriptive names for the failure mode while the values
# hold a tuple containing a function that may or may not create a failure and
# the probability weight at which rate this failure should be triggered.
#
# The method should return an http.HTTPResponse if it should modify the
# response or None if the response should be passed as is.
FAILURES = {
"Success": (lambda x: None, 50),
"Gateway error":
(lambda _: http.HTTPResponse.make(500, b"Gateway error"), 20),
"Limit exeeded": (lambda _: http.HTTPResponse.make(
429,
json.dumps({
"errcode": "M_LIMIT_EXCEEDED",
"error": "Too many requests",
"retry_after_ms": 2000
})), 20),
"Timeout error": (timeout, 10)
}
@concurrent
def request(flow):
global FAILURES
weights = [weight for (_, weight) in FAILURES.values()]
failure = random.choices(list(FAILURES), weights=weights)[0]
failure_func, _ = FAILURES[failure]
response = failure_func(flow)
if response:
flow.response = response