Import wpt@c5a14f553cba5f197743b9af605a84eddd8692a2

third_party/WebKit/LayoutTests/imported/wpt/check_stability.py

Index: third_party/WebKit/LayoutTests/imported/wpt/check_stability.py
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/check_stability.py b/third_party/WebKit/LayoutTests/imported/wpt/check_stability.py
new file mode 100644
index 0000000000000000000000000000000000000000..a5caeb335ab0e38abc16661fd85949faf263abb9
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/imported/wpt/check_stability.py
@@ -0,0 +1,488 @@
+import argparse
+import json
+import logging
+import os
+import stat
+import subprocess
+import sys
+import tarfile
+import traceback
+import zipfile
+from cStringIO import StringIO
+from collections import defaultdict
+from urlparse import urljoin
+
+import requests
+
+wptrunner = None
+wptcommandline = None
+reader = None
+LogHandler = None
+
+logger = logging.getLogger(os.path.splitext(__file__)[0])
+
+
+def do_delayed_imports():
+    global wptrunner, wptcommandline, reader
+    from wptrunner import wptrunner
+    from wptrunner import wptcommandline
+    from mozlog import reader
+    setup_log_handler()
+
+
+def setup_logging():
+    handler = logging.StreamHandler(sys.stdout)
+    formatter = logging.Formatter(logging.BASIC_FORMAT, None)
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+    logger.setLevel(logging.DEBUG)
+
+setup_logging()
+
+
+class GitHub(object):
+    def __init__(self, org, repo, token):
+        self.token = token
+        self.headers = {"Accept": "application/vnd.github.v3+json"}
+        self.auth = (self.token, "x-oauth-basic")
+        self.org = org
+        self.repo = repo
+        self.base_url = "https://api.github.com/repos/%s/%s/" % (org, repo)
+
+    def _headers(self, headers):
+        if headers is None:
+            headers = {}
+        rv = self.headers.copy()
+        rv.update(headers)
+        return rv
+
+    def post(self, url, data, headers=None):
+        logger.debug("POST %s" % url)
+        if data is not None:
+            data = json.dumps(data)
+        resp = requests.post(
+            url,
+            data=data,
+            headers=self._headers(headers),
+            auth=self.auth
+        )
+        resp.raise_for_status()
+        return resp
+
+    def get(self, url, headers=None):
+        logger.debug("GET %s" % url)
+        resp = requests.get(
+            url,
+            headers=self._headers(headers),
+            auth=self.auth
+        )
+        resp.raise_for_status()
+        return resp
+
+    def post_comment(self, issue_number, body):
+        url = urljoin(self.base_url, "issues/%s/comments" % issue_number)
+        return self.post(url, {"body": body})
+
+    def releases(self):
+        url = urljoin(self.base_url, "releases/latest")
+        return self.get(url)
+
+
+class GitHubCommentHandler(logging.Handler):
+    def __init__(self, github, pull_number):
+        logging.Handler.__init__(self)
+        self.github = github
+        self.pull_number = pull_number
+        self.log_data = []
+
+    def emit(self, record):
+        try:
+            msg = self.format(record)
+            self.log_data.append(msg)
+        except Exception:
+            self.handleError(record)
+
+    def send(self):
+        self.github.post_comment(self.pull_number, "\n".join(self.log_data))
+        self.log_data = []
+
+
+class Browser(object):
+    product = None
+
+    def __init__(self, github_token):
+        self.github_token = github_token
+
+
+class Firefox(Browser):
+    product = "firefox"
+
+    def install(self):
+        call("pip", "install", "-r", "w3c/wptrunner/requirements_firefox.txt")
+        resp = get("https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-52.0a1.en-US.linux-x86_64.tar.bz2")
+        untar(resp.raw)
+
+        if not os.path.exists("profiles"):
+            os.mkdir("profiles")
+        with open(os.path.join("profiles", "prefs_general.js"), "wb") as f:
+            resp = get("https://hg.mozilla.org/mozilla-central/raw-file/tip/testing/profiles/prefs_general.js")
+            f.write(resp.content)
+        call("pip", "install", "-r", os.path.join("w3c", "wptrunner", "requirements_firefox.txt"))
+
+    def install_webdriver(self):
+        github = GitHub("mozilla", "geckodriver", self.github_token)
+        releases = github.releases().json()
+        url = (item["browser_download_url"] for item in releases["assets"]
+               if "linux64" in item["browser_download_url"]).next()
+        untar(get(url).raw)
+
+    def wptrunner_args(self, root):
+        return {
+            "product": "firefox",
+            "binary": "%s/firefox/firefox" % root,
+            "certutil_binary": "certutil",
+            "webdriver_binary": "%s/geckodriver" % root,
+            "prefs_root": "%s/profiles" % root,
+        }
+
+
+class Chrome(Browser):
+    product = "chrome"
+
+    def install(self):
+        latest = get("https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Linux_x64%2FLAST_CHANGE?alt=media").text.strip()
+        url = "https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Linux_x64%%2F%s%%2Fchrome-linux.zip?alt=media" % latest
+        unzip(get(url).raw)
+        logger.debug(call("ls", "-lhrt", "chrome-linux"))
+        call("pip", "install", "-r", os.path.join("w3c", "wptrunner", "requirements_chrome.txt"))
+
+    def install_webdriver(self):
+        latest = get("http://chromedriver.storage.googleapis.com/LATEST_RELEASE").text.strip()
+        url = "http://chromedriver.storage.googleapis.com/%s/chromedriver_linux64.zip" % latest
+        unzip(get(url).raw)
+        st = os.stat('chromedriver')
+        os.chmod('chromedriver', st.st_mode | stat.S_IEXEC)
+
+    def wptrunner_args(self, root):
+        return {
+            "product": "chrome",
+            "binary": "%s/chrome-linux/chrome" % root,
+            "webdriver_binary": "%s/chromedriver" % root,
+            "test_types": ["testharness", "reftest"]
+        }
+
+
+def get(url):
+    logger.debug("GET %s" % url)
+    resp = requests.get(url, stream=True)
+    resp.raise_for_status()
+    return resp
+
+
+def call(*args):
+    logger.debug("%s" % " ".join(args))
+    return subprocess.check_output(args)
+
+
+def get_git_cmd(repo_path):
+    def git(cmd, *args):
+        full_cmd = ["git", cmd] + list(args)
+        try:
+            return subprocess.check_output(full_cmd, cwd=repo_path, stderr=subprocess.STDOUT)
+        except subprocess.CalledProcessError as e:
+            logger.error("Git command exited with status %i" % e.returncode)
+            logger.error(e.output)
+            sys.exit(1)
+    return git
+
+
+def seekable(fileobj):
+    try:
+        fileobj.seek(fileobj.tell())
+    except Exception:
+        return StringIO(fileobj.read())
+    else:
+        return fileobj
+
+
+def untar(fileobj):
+    logger.debug("untar")
+    fileobj = seekable(fileobj)
+    with tarfile.open(fileobj=fileobj) as tar_data:
+        tar_data.extractall()
+
+
+def unzip(fileobj):
+    logger.debug("unzip")
+    fileobj = seekable(fileobj)
+    with zipfile.ZipFile(fileobj) as zip_data:
+        for info in zip_data.infolist():
+            zip_data.extract(info)
+            perm = info.external_attr >> 16 & 0x1FF
+            os.chmod(info.filename, perm)
+
+
+def setup_github_logging(args):
+    gh_handler = None
+    if args.comment_pr:
+        github = GitHub("w3c", "web-platform-tests", args.gh_token)
+        try:
+            pr_number = int(args.comment_pr)
+        except ValueError:
+            pass
+        else:
+            gh_handler = GitHubCommentHandler(github, pr_number)
+            gh_handler.setLevel(logging.INFO)
+            logger.debug("Setting up GitHub logging")
+            logger.addHandler(gh_handler)
+    else:
+        logger.warning("No PR number found; not posting to GitHub")
+    return gh_handler
+
+
+class pwd(object):
+    def __init__(self, dir):
+        self.dir = dir
+        self.old_dir = None
+
+    def __enter__(self):
+        self.old_dir = os.path.abspath(os.curdir)
+        os.chdir(self.dir)
+
+    def __exit__(self, *args, **kwargs):
+        os.chdir(self.old_dir)
+        self.old_dir = None
+
+
+def fetch_wpt_master():
+    git = get_git_cmd(os.path.join(os.path.abspath(os.curdir), "w3c", "web-platform-tests"))
+    git("fetch", "https://github.com/w3c/web-platform-tests.git", "master:master")
+
+
+def get_sha1():
+    git = get_git_cmd(os.path.join(os.path.abspath(os.curdir), "w3c", "web-platform-tests"))
+    return git("rev-parse", "HEAD").strip()
+
+def build_manifest():
+    with pwd(os.path.join(os.path.abspath(os.curdir), "w3c", "web-platform-tests")):
+        # TODO: Call the manifest code directly
+        call("python", "manifest")
+
+
+def install_wptrunner():
+    call("git", "clone", "--depth=1", "https://github.com/w3c/wptrunner.git", "w3c/wptrunner")
+    git = get_git_cmd(os.path.join(os.path.abspath(os.curdir), "w3c", "wptrunner"))
+    git("submodule", "update", "--init", "--recursive")
+    call("pip", "install", os.path.join("w3c", "wptrunner"))
+
+
+def get_files_changed():
+    root = os.path.abspath(os.curdir)
+    git = get_git_cmd("%s/w3c/web-platform-tests" % root)
+    branch_point = git("merge-base", "HEAD", "master").strip()
+    logger.debug("Branch point from master: %s" % branch_point)
+    logger.debug(git("log", "--oneline", "%s.." % branch_point))
+    files = git("diff", "--name-only", "-z", "%s.." % branch_point)
+    if not files:
+        return []
+    assert files[-1] == "\0"
+    return ["%s/w3c/web-platform-tests/%s" % (root, item)
+            for item in files[:-1].split("\0")]
+
+
+def wptrunner_args(root, files_changed, iterations, browser):
+    parser = wptcommandline.create_parser([browser.product])
+    args = vars(parser.parse_args([]))
+    wpt_root = os.path.join(root, "w3c", "web-platform-tests")
+    args.update(browser.wptrunner_args(root))
+    args.update({
+        "tests_root": wpt_root,
+        "metadata_root": wpt_root,
+        "repeat": iterations,
+        "config": "%s/w3c/wptrunner/wptrunner.default.ini" % root,
+        "test_list": files_changed,
+        "restart_on_unexpected": False,
+        "pause_after_test": False
+    })
+    wptcommandline.check_args(args)
+    return args
+
+
+def setup_log_handler():
+    global LogHandler
+
+    class LogHandler(reader.LogHandler):
+        def __init__(self):
+            self.results = defaultdict(lambda: defaultdict(lambda: defaultdict(int)))
+
+        def test_status(self, data):
+            self.results[data["test"]][data.get("subtest")][data["status"]] += 1
+
+        def test_end(self, data):
+            self.results[data["test"]][None][data["status"]] += 1
+
+
+def is_inconsistent(results_dict, iterations):
+    return len(results_dict) > 1 or sum(results_dict.values()) != iterations
+
+
+def err_string(results_dict, iterations):
+    rv = []
+    total_results = sum(results_dict.values())
+    for key, value in sorted(results_dict.items()):
+        rv.append("%s%s" %
+                  (key, ": %s/%s" % (value, iterations) if value != iterations else ""))
+    rv = ", ".join(rv)
+    if total_results < iterations:
+        rv.append("MISSING: %s/%s" % (iterations - total_results, iterations))
+    if len(results_dict) > 1 or total_results != iterations:
+        rv = "**%s**" % rv
+    return rv
+
+
+def process_results(log, iterations):
+    inconsistent = []
+    handler = LogHandler()
+    reader.handle_log(reader.read(log), handler)
+    results = handler.results
+    for test, test_results in results.iteritems():
+        for subtest, result in test_results.iteritems():
+            if is_inconsistent(result, iterations):
+                inconsistent.append((test, subtest, result))
+    return results, inconsistent
+
+
+def write_inconsistent(inconsistent, iterations):
+    logger.error("## Unstable results ##\n")
+    logger.error("| Test | Subtest | Results |")
+    logger.error("|------|---------|---------|")
+    for test, subtest, results in inconsistent:
+        logger.error("%s | %s | %s" % (test,
+                                       subtest if subtest else "",
+                                       err_string(results, iterations)))
+
+
+def write_results(results, iterations):
+    logger.info("## All results ##\n")
+    for test, test_results in results.iteritems():
+        logger.info("### %s ###" % test)
+        logger.info("| Subtest | Results |")
+        logger.info("|---------|---------|")
+        parent = test_results.pop(None)
+        logger.info("|  | %s |" % (err_string(parent, iterations)))
+        for subtest, result in test_results.iteritems():
+            logger.info("| %s | %s |" % (subtest, err_string(result, iterations)))
+
+
+def get_parser():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--root",
+                        action="store",
+                        default=os.path.join(os.path.expanduser("~"), "build"),
+                        help="Root path")
+    parser.add_argument("--iterations",
+                        action="store",
+                        default=10,
+                        type=int,
+                        help="Number of times to run tests")
+    parser.add_argument("--gh-token",
+                        action="store",
+                        default=os.environ.get("GH_TOKEN"),
+                        help="OAuth token to use for accessing GitHub api")
+    parser.add_argument("--comment-pr",
+                        action="store",
+                        default=os.environ.get("TRAVIS_PULL_REQUEST"),
+                        help="PR to comment on with stability results")
+    parser.add_argument("browser",
+                        action="store",
+                        help="Browser to run against")
+    return parser
+
+
+def main():
+    retcode = 0
+    parser = get_parser()
+    args = parser.parse_args()
+
+    if not os.path.exists(args.root):
+        logger.critical("Root directory %s does not exist" % args.root)
+        return 1
+
+    os.chdir(args.root)
+
+    if args.gh_token is None:
+        logger.critical("Must provide a GitHub token via --gh-token or $GITHUB_TOKEN")
+        return 1
+
+    gh_handler = setup_github_logging(args)
+
+    logger.info("# %s #" % args.browser.title())
+
+    browser_cls = {"firefox": Firefox,
+                   "chrome": Chrome}.get(args.browser)
+    if browser_cls is None:
+        logger.critical("Unrecognised browser %s" % args.browser)
+        return 1
+
+    fetch_wpt_master()
+
+    head_sha1 = get_sha1()
+    logger.info("Testing revision %s" % head_sha1)
+
+    # For now just pass the whole list of changed files to wptrunner and
+    # assume that it will run everything that's actually a test
+    files_changed = get_files_changed()
+
+    if not files_changed:
+        logger.info("No files changed")
+        return 0
+
+    build_manifest()
+    install_wptrunner()
+    do_delayed_imports()
+
+    logger.debug("Files changed:\n%s" % "".join(" * %s\n" % item for item in files_changed))
+
+    browser = browser_cls(args.gh_token)
+
+    browser.install()
+    browser.install_webdriver()
+
+    kwargs = wptrunner_args(args.root,
+                            files_changed,
+                            args.iterations,
+                            browser)
+    with open("raw.log", "wb") as log:
+        wptrunner.setup_logging(kwargs,
+                                {"tbpl": sys.stdout,
+                                 "raw": log})
+        wptrunner.run_tests(**kwargs)
+
+    with open("raw.log", "rb") as log:
+        results, inconsistent = process_results(log, args.iterations)
+
+    if results:
+        if inconsistent:
+            write_inconsistent(inconsistent, args.iterations)
+            retcode = 2
+        else:
+            logger.info("All results were stable\n")
+        write_results(results, args.iterations)
+    else:
+        logger.info("No tests run.")
+
+    try:
+        if gh_handler:
+            gh_handler.send()
+    except Exception:
+        logger.error(traceback.format_exc())
+    return retcode
+
+
+if __name__ == "__main__":
+    try:
+        retcode = main()
+    except:
+        raise
+    else:
+        sys.exit(retcode)