Add WASM testrunner

Add a python script that allows us to run wasm tests in CI, along with
the necessary cmake logic to install the script and execute tests
accordingly.

Change-Id: I93b95c115538c4e27b2b833405acab8162be2a8a
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

3 files changed, 261 insertions, 0 deletions

diff --git a/util/wasm/wasmtestrunner/Pipfile b/util/wasm/wasmtestrunner/Pipfile
new file mode 100644
index 0000000000..851778a313
--- /dev/null
+++ b/util/wasm/wasmtestrunner/Pipfile
@@ -0,0 +1,13 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+selenium = "*"
+argparse = "*"
+
+[dev-packages]
+
+[requires]
+python_version = "3.9"
diff --git a/util/wasm/wasmtestrunner/README.md b/util/wasm/wasmtestrunner/README.md
new file mode 100644
index 0000000000..0beb3f0c12
--- /dev/null
+++ b/util/wasm/wasmtestrunner/README.md
@@ -0,0 +1,10 @@
+# qtwasmtestrunner
+This is a utility that launches a small webserver and\
+either a browser or a webdriver (only chrome/chromedriver at the time of writing)\
+This allows running wasm tests and printing the output to stdout like a normal test.
+
+chromedriver must be installed: https://chromedriver.chromium.org/ \
+to use it with chromedriver (default operation), and it must be in PATH\
+unless --chromedriver_path is passed with full path to chromedriver
+
+Run the script with --help for more info.
diff --git a/util/wasm/wasmtestrunner/qt-wasmtestrunner.py b/util/wasm/wasmtestrunner/qt-wasmtestrunner.py
new file mode 100755
index 0000000000..1cf515e82d
--- /dev/null
+++ b/util/wasm/wasmtestrunner/qt-wasmtestrunner.py
@@ -0,0 +1,238 @@
+#!/usr/bin/env python3
+#############################################################################
+##
+# Copyright (C) 2021 The Qt Company Ltd.
+# Contact: https://www.qt.io/licensing/
+#
+# This file is part of the plugins of the Qt Toolkit.
+#
+# $QT_BEGIN_LICENSE:GPL-EXCEPT$
+# Commercial License Usage
+# Licensees holding valid commercial Qt licenses may use this file in
+# accordance with the commercial license agreement provided with the
+# Software or, alternatively, in accordance with the terms contained in
+# a written agreement between you and The Qt Company. For licensing terms
+# and conditions see https://www.qt.io/terms-conditions. For further
+# information use the contact form at https://www.qt.io/contact-us.
+#
+# GNU General Public License Usage
+# Alternatively, this file may be used under the terms of the GNU
+# General Public License version 3 as published by the Free Software
+# Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+# included in the packaging of this file. Please review the following
+# information to ensure the GNU General Public License requirements will
+# be met: https://www.gnu.org/licenses/gpl-3.0.html.
+#
+# $QT_END_LICENSE$
+#
+#############################################################################
+
+import re
+import os
+import sys
+import time
+import atexit
+import threading
+import subprocess
+import http.server
+from pathlib import Path
+
+from selenium import webdriver
+from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
+from selenium.webdriver.chrome.service import Service
+import argparse
+
+
+class WasmTestRunner:
+    def __init__(self, args: dict):
+        self.server_process = None
+        self.browser_process = None
+        self.python_path = Path(sys.executable)
+        self.script_dir = Path(os.path.dirname(os.path.realpath(__file__)))
+        self.host = 'localhost'
+        self.webserver = None
+        self.webthread = None
+
+        paths = ['html_path', 'browser_path', 'chromedriver_path', 'tmp_dir']
+
+        for key, value in args.items():
+            if value is None:
+                continue
+            if key in paths:
+                value = Path(value)
+                value.resolve()
+            setattr(self, key, value)
+
+        if not self.html_path.exists():
+            raise FileNotFoundError(self.html_path)
+
+        self.webroot = self.html_path.parent
+
+        if hasattr(self, 'browser_path') and not self.browser_path.exists():
+            raise FileNotFoundError(self.browser_path)
+
+        atexit.register(self.cleanup)
+
+    def run(self):
+        # self.run_webserver()
+        self.run_threaded_webserver()
+
+        if self.use_browser:
+            self.run_wasm_browser()
+        else:
+            self.run_wasm_webdriver()
+
+        self.shutdown_threaded_webserver()
+
+    def run_webserver(self):
+        webroot = self.html_path.parent.resolve()
+        self.server_process =\
+            subprocess.Popen([
+                str(self.python_path),
+                '-m', 'http.server',
+                '--directory', str(webroot),
+                self.port
+            ])
+
+    def run_threaded_webserver(self):
+        self.webserver = http.server.ThreadingHTTPServer(
+            (self.host, int(self.port)), self.get_http_handler_class())
+
+        self.webthread = threading.Thread(target=self.webserver.serve_forever)
+        self.webthread.start()
+
+    def shutdown_threaded_webserver(self):
+        if self.webserver is not None:
+            self.webserver.shutdown()
+        if self.webthread is not None:
+            self.webthread.join()
+
+    def run_wasm_webdriver(self):
+        url = f'http://localhost:{self.port}/{self.html_path.name}'
+
+        d = DesiredCapabilities.CHROME
+        d['goog:loggingPrefs'] = {'browser': 'ALL'}
+        ser = Service(executable_path=self.chromedriver_path)
+        driver = webdriver.Chrome(desired_capabilities=d, service=ser)
+        driver.get(url)
+
+        timeout = 15
+        test_done = False
+
+        while not test_done and timeout != 0:
+            # HACK : we don't know for sure how long each test takes
+            # so just sleep a bit here until we get desired result
+            # The test may never produce 'Finished testing' (eg. crash),
+            # so we need a timeout as well
+            time.sleep(1)
+            timeout = timeout - 1
+            for entry in driver.get_log('browser'):
+                regex = re.compile(r'[^"]*"(.*)".*')
+                match = regex.match(entry['message'])
+
+                if match is not None:
+                    console_line = match.group(1)
+                    print(console_line)
+                    if 'Finished testing' in console_line:
+                        test_done = True
+
+    def run_wasm_browser(self):
+        if not hasattr(self, 'browser_path'):
+            print('Error: browser path must be set to run with browser')
+            return
+
+        if not hasattr(self, 'tmp_dir'):
+            print('Error: tmp_dir must be set to run with browser')
+            return
+
+        self.create_tmp_dir()
+        self.browser_process =\
+            subprocess.Popen([
+                str(self.browser_path),
+                '--user-data-dir=' + str(self.tmp_dir),
+                '--enable-logging=stderr',
+                f'http://localhost:{self.port}/{self.html_path.name}'
+            ],
+                stderr=subprocess.PIPE
+            )
+
+        # Only capture the console content
+        regex = re.compile(r'[^"]*CONSOLE[^"]*"(.*)"[.\w]*')
+
+        for line in self.browser_process.stderr:
+            str_line = line.decode('utf-8')
+
+            match = regex.match(str_line)
+
+            # Error condition, this should have matched
+            if 'CONSOLE' in str_line and match is None:
+                print('Error: did not match console line:')
+                print(str_line)
+
+            if match is not None:
+                console_line = match.group(1)
+                print(console_line)
+
+            if 'Finished testing' in str_line:
+                self.browser_process.kill()
+                break
+
+    def create_tmp_dir(self):
+        if not self.tmp_dir.exists():
+            self.tmp_dir.mkdir()
+
+        if not self.tmp_dir.is_dir():
+            raise NotADirectoryError(self.tmp_dir)
+
+        # Needed to bypass the "Welcome to Chrome" prompt
+        first_run = Path(self.tmp_dir, 'First Run')
+        first_run.touch()
+
+    def get_http_handler_class(self):
+        wtr = self
+
+        class OriginIsolationHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
+            def __init__(self, request, client_address, server):
+                super().__init__(request, client_address, server, directory=wtr.webroot)
+
+            # Headers required to enable SharedArrayBuffer
+            # See https://web.dev/cross-origin-isolation-guide/
+            def end_headers(self):
+                self.send_header("Cross-Origin-Opener-Policy", "same-origin")
+                self.send_header("Cross-Origin-Embedder-Policy", "require-corp")
+                self.send_header("Cross-Origin-Resource-Policy", "cross-origin")
+                http.server.SimpleHTTPRequestHandler.end_headers(self)
+
+            # We usually don't care that much about what the webserver is logging
+            def log_message(self, format_, *args):
+                return
+
+        return OriginIsolationHTTPRequestHandler
+
+    def cleanup(self):
+        if self.browser_process is not None:
+            self.browser_process.kill()
+        if self.server_process is not None:
+            self.server_process.kill()
+        self.shutdown_threaded_webserver()
+
+
+def main():
+    parser = argparse.ArgumentParser(description='WASM testrunner')
+    parser.add_argument('html_path', help='Path to the HTML file to request')
+    parser.add_argument('--port', help='Port to run the webserver on', default='8000')
+    parser.add_argument('--use_browser', action='store_true')
+    parser.add_argument('--browser_path', help='Path to the browser to use')
+    parser.add_argument('--chromedriver_path', help='Absolute path to chromedriver',
+                        default='chromedriver')
+    parser.add_argument('--tmp_dir', help='Path to the tmpdir to use when using a browser',
+                        default='/tmp/wasm-testrunner')
+
+    args = vars(parser.parse_args())
+
+    test_runner = WasmTestRunner(args)
+    test_runner.run()
+
+
+if __name__ == '__main__':
+    main()