Import wpt@26c8d4e87448d1c4e5ebf2ddb4917c0633c201db

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..aa504189057ee0f7d370f6e261258ae085497bd3
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/imported/wpt/check_stability.py
@@ -0,0 +1,284 @@
+import argparse
+import json
+import logging
+import os
+import subprocess
+import sys
+import traceback
+from collections import defaultdict
+
+import requests
+
+from wptrunner import wptrunner
+from wptrunner import wptcommandline
+from mozlog import reader
+
+logger = logging.getLogger(os.path.splitext(__file__)[0])
+
+
+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()
+
+
+def setup_github_logging(args):
+    gh_handler = None
+    if args.comment_pr:
+        if args.gh_token:
+            try:
+                pr_number = int(args.comment_pr)
+            except ValueError:
+                pass
+            else:
+                gh_handler = GitHubCommentHandler(args.gh_token, pr_number)
+                logger.debug("Setting up GitHub logging")
+                logger.addHandler(gh_handler)
+        else:
+            logger.error("Must provide --comment-pr and --github-token together")
+    return gh_handler
+
+
+class GitHubCommentHandler(logging.Handler):
+    def __init__(self, token, pull_number):
+        logging.Handler.__init__(self)
+        self.token = token
+        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):
+        headers = {"Accept": "application/vnd.github.v3+json"}
+        auth = (self.token, "x-oauth-basic")
+        url = "https://api.github.com/repos/w3c/web-platform-tests/issues/%s/comments" %(
+            self.pull_number,)
+        resp = requests.post(
+            url,
+            data=json.dumps({"body": "\n".join(self.log_data)}),
+            headers=headers,
+            auth=auth
+        )
+        resp.raise_for_status()
+        self.log_data = []
+
+
+class Firefox(object):
+    product = "firefox"
+
+    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(object):
+    product = "chrome"
+
+    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_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 get_files_changed(root):
+    git = get_git_cmd("%s/w3c/web-platform-tests" % root)
+    branch_point = git("merge-base", "HEAD", "master").strip()
+    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
+
+
+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):
+    rv = []
+    for key, value in sorted(results_dict.items()):
+        rv.append("%s: %i" % (key, value))
+    rv = " ".join(rv)
+    if len(results_dict) > 1:
+        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):
+    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 "(parent)",
+                                       err_string(results)))
+
+
+def write_results(results, iterations):
+    logger.info("## All results ##\n")
+    logger.info("| Test | Subtest | Results |")
+    logger.info("|------|---------|---------|")
+    for test, test_results in results.iteritems():
+        parent = test_results.pop(None)
+        logger.info("| %s |  | %s |" % (test, err_string(parent)))
+        for subtest, result in test_results.iteritems():
+            logger.info("|  | %s | %s |" % (subtest, err_string(result)))
+
+
+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",
+                        help="OAuth token to use for accessing GitHub api")
+    parser.add_argument("--comment-pr",
+                        action="store",
+                        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()
+
+    gh_handler = setup_github_logging(args)
+
+    logger.info("Testing in **%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 2
+
+    # 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(args.root)
+
+    if not files_changed:
+        return 0
+
+    logger.info("Files changed:\n%s" % "".join(" * %s\n" % item for item in files_changed))
+
+    browser = browser_cls()
+    kwargs = wptrunner_args(args.root,
+                            files_changed,
+                            args.iterations,
+                            browser)
+    with open("raw.log", "wb") as log:
+        wptrunner.setup_logging(kwargs,
+                                {"mach": 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)
+            retcode = 1
+        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)