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util.py
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util.py
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import functools
import gc
import os
import socket
import datetime
from cryptography import x509
from cryptography.x509.oid import NameOID
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from contextlib import contextmanager
from tempfile import NamedTemporaryFile
@contextmanager
def temporary_file(content, suffix="_locustfile.py", dir=None):
f = NamedTemporaryFile(suffix=suffix, delete=False, dir=dir)
f.write(content.encode("utf-8"))
f.close()
try:
yield f.name
finally:
if os.path.exists(f.name):
os.remove(f.name)
@contextmanager
def patch_env(name: str, value: str):
prev_value = os.getenv(name)
os.environ[name] = value
try:
yield
finally:
if prev_value is None:
del os.environ[name]
else:
os.environ[name] = prev_value
def get_free_tcp_port():
"""
Find an unused TCP port
"""
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("127.0.0.1", 0))
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
port = s.getsockname()[1]
s.close()
return port
def create_tls_cert(hostname):
"""Generate a TLS cert and private key to serve over https"""
key = rsa.generate_private_key(public_exponent=2**16 + 1, key_size=2048, backend=default_backend())
name = x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, hostname)])
now = datetime.datetime.now(tz=datetime.timezone.utc)
cert = (
x509.CertificateBuilder()
.subject_name(name)
.issuer_name(name)
.public_key(key.public_key())
.serial_number(1000)
.not_valid_before(now)
.not_valid_after(now + datetime.timedelta(days=10 * 365))
.sign(key, hashes.SHA256(), default_backend())
)
cert_pem = cert.public_bytes(encoding=serialization.Encoding.PEM)
key_pem = key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
)
return cert_pem, key_pem
def clear_all_functools_lru_cache() -> None:
# Clear all `functools.lru_cache` to ensure that no state are persisted from one test to another.
# Taken from https://stackoverflow.com/a/50699209.
gc.collect()
wrappers = [a for a in gc.get_objects() if isinstance(a, functools._lru_cache_wrapper)]
assert len(wrappers) > 0
for wrapper in wrappers:
wrapper.cache_clear()