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pyodide/conftest.py

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"""
Various common utilities for testing.
"""
import contextlib
import multiprocessing
import textwrap
import tempfile
import time
import os
import pathlib
import queue
import sys
import shutil
import pytest
ROOT_PATH = pathlib.Path(__file__).parents[0].resolve()
TEST_PATH = ROOT_PATH / "src" / "tests"
BUILD_PATH = ROOT_PATH / "build"
sys.path.append(str(ROOT_PATH / "pyodide-build"))
from pyodide_build.testing import set_webdriver_script_timeout, parse_driver_timeout
def pytest_addoption(parser):
group = parser.getgroup("general")
group.addoption(
"--build-dir",
action="store",
default=BUILD_PATH,
help="Path to the build directory",
)
group.addoption(
"--run-xfail",
action="store_true",
help="If provided, tests marked as xfail will be run",
)
def pytest_configure(config):
"""Monkey patch the function cwd_relative_nodeid
returns the description of a test for the short summary table. Monkey patch
it to reduce the verbosity of the test names in the table. This leaves
enough room to see the information about the test failure in the summary.
"""
old_cwd_relative_nodeid = config.cwd_relative_nodeid
def cwd_relative_nodeid(*args):
result = old_cwd_relative_nodeid(*args)
result = result.replace("src/tests/", "")
result = result.replace("packages/", "")
result = result.replace("::test_", "::")
return result
config.cwd_relative_nodeid = cwd_relative_nodeid
class JavascriptException(Exception):
def __init__(self, msg, stack):
self.msg = msg
self.stack = stack
# In chrome the stack contains the message
if self.stack and self.stack.startswith(self.msg):
self.msg = ""
def __str__(self):
return "\n\n".join(x for x in [self.msg, self.stack] if x)
class SeleniumWrapper:
JavascriptException = JavascriptException
def __init__(
self,
server_port,
server_hostname="127.0.0.1",
server_log=None,
build_dir=None,
load_pyodide=True,
script_timeout=20,
):
if build_dir is None:
build_dir = BUILD_PATH
self.driver = self.get_driver()
self.server_port = server_port
self.server_hostname = server_hostname
self.server_log = server_log
if not (pathlib.Path(build_dir) / "test.html").exists():
# selenium does not expose HTTP response codes
raise ValueError(
f"{(build_dir / 'test.html').resolve()} " f"does not exist!"
)
self.driver.get(f"http://{server_hostname}:{server_port}/test.html")
self.javascript_setup()
if load_pyodide:
self.run_js(
"""
window.pyodide = await loadPyodide({ indexURL : './', fullStdLib: false });
pyodide.runPython("");
"""
)
self.save_state()
self.script_timeout = script_timeout
self.driver.set_script_timeout(script_timeout)
def javascript_setup(self):
self.run_js("Error.stackTraceLimit = Infinity;", pyodide_checks=False)
self.run_js(
"""
window.assert = function(cb, message=""){
if(message !== ""){
message = "\\n" + message;
}
if(cb() !== true){
throw new Error(`Assertion failed: ${cb.toString().slice(6)}${message}`);
}
};
window.assertAsync = async function(cb, message=""){
if(message !== ""){
message = "\\n" + message;
}
if(await cb() !== true){
throw new Error(`Assertion failed: ${cb.toString().slice(12)}${message}`);
}
};
function checkError(err, errname, pattern, pat_str, thiscallstr){
if(typeof pattern === "string"){
pattern = new RegExp(pattern);
}
if(!err){
throw new Error(`${thiscallstr} failed, no error thrown`);
}
if(err.constructor.name !== errname){
throw new Error(
`${thiscallstr} failed, expected error ` +
`of type '${errname}' got type '${err.constructor.name}'`
);
}
if(!pattern.test(err.message)){
throw new Error(
`${thiscallstr} failed, expected error ` +
`message to match pattern ${pat_str} got:\n${err.message}`
);
}
}
window.assertThrows = function(cb, errname, pattern){
let pat_str = typeof pattern === "string" ? `"${pattern}"` : `${pattern}`;
let thiscallstr = `assertThrows(${cb.toString()}, "${errname}", ${pat_str})`;
let err = undefined;
try {
cb();
} catch(e) {
err = e;
}
checkError(err, errname, pattern, pat_str, thiscallstr);
};
window.assertThrowsAsync = async function(cb, errname, pattern){
let pat_str = typeof pattern === "string" ? `"${pattern}"` : `${pattern}`;
let thiscallstr = `assertThrowsAsync(${cb.toString()}, "${errname}", ${pat_str})`;
let err = undefined;
try {
await cb();
} catch(e) {
err = e;
}
checkError(err, errname, pattern, pat_str, thiscallstr);
};
""",
pyodide_checks=False,
)
@property
def logs(self):
logs = self.driver.execute_script("return window.logs;")
if logs is not None:
return "\n".join(str(x) for x in logs)
else:
return ""
def clean_logs(self):
self.driver.execute_script("window.logs = []")
def run(self, code):
return self.run_js(
f"""
let result = pyodide.runPython({code!r});
if(result && result.toJs){{
let converted_result = result.toJs();
if(pyodide.isPyProxy(converted_result)){{
converted_result = undefined;
}}
result.destroy();
return converted_result;
}}
return result;
"""
)
def run_async(self, code):
return self.run_js(
f"""
await pyodide.loadPackagesFromImports({code!r})
let result = await pyodide.runPythonAsync({code!r});
if(result && result.toJs){{
let converted_result = result.toJs();
if(pyodide.isPyProxy(converted_result)){{
converted_result = undefined;
}}
result.destroy();
return converted_result;
}}
return result;
"""
)
def run_js(self, code, pyodide_checks=True):
"""Run JavaScript code and check for pyodide errors"""
if isinstance(code, str) and code.startswith("\n"):
# we have a multiline string, fix indentation
code = textwrap.dedent(code)
if pyodide_checks:
check_code = """
if(globalThis.pyodide && pyodide._module && pyodide._module._PyErr_Occurred()){
try {
pyodide._module._pythonexc2js();
} catch(e){
console.error(`Python exited with error flag set! Error was:\n{e.message}`);
// Don't put original error message in new one: we want
// "pytest.raises(xxx, match=msg)" to fail
throw new Error(`Python exited with error flag set!`);
}
}
"""
else:
check_code = ""
wrapper = """
let cb = arguments[arguments.length - 1];
let run = async () => { %s }
(async () => {
try {
let result = await run();
%s
cb([0, result]);
} catch (e) {
cb([1, e.toString(), e.stack]);
}
})()
"""
retval = self.driver.execute_async_script(wrapper % (code, check_code))
if retval[0] == 0:
return retval[1]
else:
raise JavascriptException(retval[1], retval[2])
def get_num_hiwire_keys(self):
return self.run_js("return pyodide._module.hiwire.num_keys();")
def save_state(self):
self.run_js("self.__savedState = pyodide._module.saveState();")
def restore_state(self):
self.run_js("pyodide._module.restoreState(self.__savedState)")
def get_num_proxies(self):
return self.run_js("return pyodide._module.pyproxy_alloc_map.size")
def enable_pyproxy_tracing(self):
self.run_js("pyodide._module.enable_pyproxy_allocation_tracing()")
def disable_pyproxy_tracing(self):
self.run_js("pyodide._module.disable_pyproxy_allocation_tracing()")
def run_webworker(self, code):
if isinstance(code, str) and code.startswith("\n"):
# we have a multiline string, fix indentation
code = textwrap.dedent(code)
return self.run_js(
"""
let worker = new Worker( '{}' );
let res = new Promise((res, rej) => {{
worker.onerror = e => rej(e);
worker.onmessage = e => {{
if (e.data.results) {{
res(e.data.results);
}} else {{
rej(e.data.error);
}}
}};
worker.postMessage({{ python: {!r} }});
}});
return await res
""".format(
f"http://{self.server_hostname}:{self.server_port}/webworker_dev.js",
code,
),
pyodide_checks=False,
)
def load_package(self, packages):
self.run_js("await pyodide.loadPackage({!r})".format(packages))
@property
def urls(self):
for handle in self.driver.window_handles:
self.driver.switch_to.window(handle)
yield self.driver.current_url
class FirefoxWrapper(SeleniumWrapper):
browser = "firefox"
def get_driver(self):
from selenium.webdriver import Firefox
from selenium.webdriver.firefox.options import Options
options = Options()
options.add_argument("-headless")
return Firefox(executable_path="geckodriver", options=options)
class ChromeWrapper(SeleniumWrapper):
browser = "chrome"
def get_driver(self):
from selenium.webdriver import Chrome
from selenium.webdriver.chrome.options import Options
options = Options()
options.add_argument("--headless")
options.add_argument("--no-sandbox")
options.add_argument("--js-flags=--expose-gc")
return Chrome(options=options)
@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_call(item):
"""We want to run extra verification at the start and end of each test to
check that we haven't leaked memory. According to pytest issue #5044, it's
not possible to "Fail" a test from a fixture (no matter what you do, pytest
sets the test status to "Error"). The approach suggested there is hook
pytest_runtest_call as we do here. To get access to the selenium fixture, we
immitate the definition of pytest_pyfunc_call:
https://github.com/pytest-dev/pytest/blob/6.2.2/src/_pytest/python.py#L177
Pytest issue #5044:
https://github.com/pytest-dev/pytest/issues/5044
"""
selenium = None
if "selenium" in item._fixtureinfo.argnames:
selenium = item.funcargs["selenium"]
if "selenium_standalone" in item._fixtureinfo.argnames:
selenium = item.funcargs["selenium_standalone"]
if selenium:
trace_hiwire_refs = pytest.mark.skip_refcount_check.mark not in item.own_markers
trace_pyproxies = pytest.mark.skip_pyproxy_check.mark not in item.own_markers
yield from test_wrapper_check_for_memory_leaks(
selenium, trace_hiwire_refs, trace_pyproxies
)
else:
yield
def test_wrapper_check_for_memory_leaks(selenium, trace_hiwire_refs, trace_pyproxies):
init_num_keys = selenium.get_num_hiwire_keys()
if trace_pyproxies:
selenium.enable_pyproxy_tracing()
init_num_proxies = selenium.get_num_proxies()
a = yield
selenium.disable_pyproxy_tracing()
selenium.restore_state()
# if there was an error in the body of the test, flush it out by calling
# get_result (we don't want to override the error message by raising a
# different error here.)
a.get_result()
if trace_pyproxies:
delta_proxies = selenium.get_num_proxies() - init_num_proxies
assert delta_proxies == 0
if trace_hiwire_refs:
delta_keys = selenium.get_num_hiwire_keys() - init_num_keys
assert delta_keys == 0
@contextlib.contextmanager
def selenium_common(request, web_server_main, load_pyodide=True):
server_hostname, server_port, server_log = web_server_main
if request.param == "firefox":
cls = FirefoxWrapper
elif request.param == "chrome":
cls = ChromeWrapper
else:
assert False
selenium = cls(
build_dir=request.config.option.build_dir,
server_port=server_port,
server_hostname=server_hostname,
server_log=server_log,
load_pyodide=load_pyodide,
)
try:
yield selenium
finally:
selenium.driver.quit()
@pytest.fixture(params=["firefox", "chrome"], scope="function")
def selenium_standalone(request, web_server_main):
with selenium_common(request, web_server_main) as selenium:
with set_webdriver_script_timeout(
selenium, script_timeout=parse_driver_timeout(request)
):
try:
yield selenium
finally:
print(selenium.logs)
@pytest.fixture(params=["firefox", "chrome"], scope="function")
def selenium_webworker_standalone(request, web_server_main):
with selenium_common(request, web_server_main, load_pyodide=False) as selenium:
with set_webdriver_script_timeout(
selenium, script_timeout=parse_driver_timeout(request)
):
try:
yield selenium
finally:
print(selenium.logs)
# selenium instance cached at the module level
@pytest.fixture(params=["firefox", "chrome"], scope="module")
def selenium_module_scope(request, web_server_main):
with selenium_common(request, web_server_main) as selenium:
yield selenium
# Hypothesis is unhappy with function scope fixtures. Instead, use the
# module scope fixture `selenium_module_scope` and use:
# `with selenium_context_manager(selenium_module_scope) as selenium`
@contextlib.contextmanager
def selenium_context_manager(selenium_module_scope):
try:
selenium_module_scope.clean_logs()
yield selenium_module_scope
finally:
print(selenium_module_scope.logs)
@pytest.fixture
def selenium(request, selenium_module_scope):
with selenium_context_manager(selenium_module_scope) as selenium:
with set_webdriver_script_timeout(
selenium, script_timeout=parse_driver_timeout(request)
):
yield selenium
@pytest.fixture(scope="session")
def web_server_main(request):
"""Web server that serves files in the build/ directory"""
with spawn_web_server(request.config.option.build_dir) as output:
yield output
@pytest.fixture(scope="session")
def web_server_secondary(request):
"""Secondary web server that serves files build/ directory"""
with spawn_web_server(request.config.option.build_dir) as output:
yield output
@pytest.fixture(scope="session")
def web_server_tst_data(request):
"""Web server that serves files in the src/tests/data/ directory"""
with spawn_web_server(TEST_PATH / "data") as output:
yield output
@contextlib.contextmanager
def spawn_web_server(build_dir=None):
if build_dir is None:
build_dir = BUILD_PATH
tmp_dir = tempfile.mkdtemp()
log_path = pathlib.Path(tmp_dir) / "http-server.log"
q = multiprocessing.Queue()
p = multiprocessing.Process(target=run_web_server, args=(q, log_path, build_dir))
try:
p.start()
port = q.get()
hostname = "127.0.0.1"
print(
f"Spawning webserver at http://{hostname}:{port} "
f"(see logs in {log_path})"
)
yield hostname, port, log_path
finally:
q.put("TERMINATE")
p.join()
shutil.rmtree(tmp_dir)
def run_web_server(q, log_filepath, build_dir):
"""Start the HTTP web server
Parameters
----------
q : Queue
communication queue
log_path : pathlib.Path
path to the file where to store the logs
"""
import http.server
import socketserver
os.chdir(build_dir)
log_fh = log_filepath.open("w", buffering=1)
sys.stdout = log_fh
sys.stderr = log_fh
class Handler(http.server.SimpleHTTPRequestHandler):
def log_message(self, format_, *args):
print(
"[%s] source: %s:%s - %s"
% (self.log_date_time_string(), *self.client_address, format_ % args)
)
def end_headers(self):
# Enable Cross-Origin Resource Sharing (CORS)
self.send_header("Access-Control-Allow-Origin", "*")
super().end_headers()
with socketserver.TCPServer(("", 0), Handler) as httpd:
host, port = httpd.server_address
print(f"Starting webserver at http://{host}:{port}")
httpd.server_name = "test-server"
httpd.server_port = port
q.put(port)
def service_actions():
try:
if q.get(False) == "TERMINATE":
print("Stopping server...")
sys.exit(0)
except queue.Empty:
pass
httpd.service_actions = service_actions
httpd.serve_forever()
if (
__name__ == "__main__"
and multiprocessing.current_process().name == "MainProcess"
and not hasattr(sys, "_pytest_session")
):
with spawn_web_server():
# run forever
while True:
time.sleep(1)
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