runbot/runbot_merge/github.py
Xavier Morel cd4ded899b [IMP] runbot_merge: error reporting
Largely informed by sentry,

- Fix an inconsistency in staging ref verification, `set_ref`
  internally waits for the observed head to match the requested head,
  but then `try_staging` would re-check that and immediately fail if
  it didn't.

  Because github is *eventually* consistent (hopefully) this second
  check can fail (and is also an extra API call), breaking staging
  unnecessarily, especially as we're still going to wait for the
  update to be visible to git.

  Remove this redundant check entirely, as github provides no way to
  ensure we have a consistent view of anything, it doesn't have much
  value and can do much harm.
- Add github request id to one of the sanity check warnings as that
  could be a useful thing to send upstream, missing github request ids
  in the future should be noted and added.
- Reworked the GH object's calls to be clearer and more coherent:
  consistently log the same thing on all GH errors (if `check`),
  rather than just on the one without a `check` entry.

  Also remove `raise_for_status` and raise `HTTPError` by hand every
  time we hit a status >= 400, so we always forward the response body
  no matter what its type is.
- Try again to log the request body (in full as it should be pretty
  small), also remove stripping since we specifically wanted to add a
  newline at the start, I've no idea what I was thinking.

Fixes #735, #764, #544
2023-06-14 16:01:45 +02:00

404 lines
15 KiB
Python

import collections.abc
import itertools
import json
import logging
import logging.handlers
import os
import pathlib
import pprint
import unicodedata
import requests
import werkzeug.urls
import odoo.netsvc
from odoo.tools import topological_sort, config
from . import exceptions, utils
class MergeError(Exception): ...
def _is_json(r):
return r and r.headers.get('content-type', '').startswith(('application/json', 'application/javascript'))
_logger = logging.getLogger(__name__)
_gh = logging.getLogger('github_requests')
def _init_gh_logger():
""" Log all GH requests / responses so we have full tracking, but put them
in a separate file if we're logging to a file
"""
if not config['logfile']:
return
original = pathlib.Path(config['logfile'])
new = original.with_name('github_requests')\
.with_suffix(original.suffix)
if os.name == 'posix':
handler = logging.handlers.WatchedFileHandler(str(new))
else:
handler = logging.FileHandler(str(new))
handler.setFormatter(odoo.netsvc.DBFormatter(
'%(asctime)s %(pid)s %(levelname)s %(dbname)s %(name)s: %(message)s'
))
_gh.addHandler(handler)
_gh.propagate = False
if odoo.netsvc._logger_init:
_init_gh_logger()
GH_LOG_PATTERN = """=> {method} /{path}{qs}{body}
<= {r.status_code} {r.reason}
{headers}
{body2}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"""
class GH(object):
def __init__(self, token, repo):
self._url = 'https://api.github.com'
self._repo = repo
session = self._session = requests.Session()
session.headers['Authorization'] = 'token {}'.format(token)
session.headers['Accept'] = 'application/vnd.github.symmetra-preview+json'
def _log_gh(self, logger: logging.Logger, response: requests.Response, level: int = logging.INFO, extra=None):
""" Logs a pair of request / response to github, to the specified
logger, at the specified level.
Tries to format all the information (including request / response
bodies, at least in part) so we have as much information as possible
for post-mortems.
"""
req = response.request
url = werkzeug.urls.url_parse(req.url)
if url.netloc is not 'api.github.com':
return
body = '' if not req.body else ('\n' + pprint.pformat(json.loads(req.body.decode()), indent=4))
body2 = ''
if response.content:
if _is_json(response):
body2 = pprint.pformat(response.json(), depth=4)
elif response.encoding is not None:
body2 = response.text
else: # fallback: universal decoding & replace nonprintables
body2 = ''.join(
'\N{REPLACEMENT CHARACTER}' if unicodedata.category(c) == 'Cc' else c
for c in response.content.decode('iso-8859-1')
)
logger.log(level, GH_LOG_PATTERN.format(
# requests data
method=req.method, path=url.path, qs=url.query, body=body,
# response data
r=response,
headers='\n'.join(
'\t%s: %s' % (h, v) for h, v in response.headers.items()
),
body2=utils.shorten(body2.strip(), 400)
), extra=extra)
def __call__(self, method, path, params=None, json=None, check=True):
"""
:type check: bool | dict[int:Exception]
"""
path = f'/repos/{self._repo}/{path}'
r = self._session.request(method, self._url + path, params=params, json=json)
self._log_gh(_gh, r)
if check:
try:
if isinstance(check, collections.abc.Mapping):
exc = check.get(r.status_code)
if exc:
raise exc(r.text)
if r.status_code >= 400:
raise requests.HTTPError(r.text, response=r)
except Exception:
self._log_gh(_logger, r, level=logging.ERROR, extra={
'github-request-id': r.headers.get('x-github-request-id'),
})
raise
return r
def user(self, username):
r = self._session.get("{}/users/{}".format(self._url, username))
r.raise_for_status()
return r.json()
def head(self, branch):
d = utils.backoff(
lambda: self('get', 'git/refs/heads/{}'.format(branch)).json(),
exc=requests.HTTPError
)
assert d['ref'] == 'refs/heads/{}'.format(branch)
assert d['object']['type'] == 'commit'
_logger.debug("head(%s, %s) -> %s", self._repo, branch, d['object']['sha'])
return d['object']['sha']
def commit(self, sha):
c = self('GET', 'git/commits/{}'.format(sha)).json()
_logger.debug('commit(%s, %s) -> %s', self._repo, sha, shorten(c['message']))
return c
def comment(self, pr, message):
# if the mergebot user has been blocked by the PR author, this will
# fail, but we don't want the closing of the PR to fail, or for the
# feedback cron to get stuck
try:
self('POST', 'issues/{}/comments'.format(pr), json={'body': message})
except requests.HTTPError as r:
if _is_json(r.response):
body = r.response.json()
if any(e.message == 'User is blocked' for e in (body.get('errors') or [])):
_logger.warning("comment(%s#%s) failed: user likely blocked", self._repo, pr)
return
raise
_logger.debug('comment(%s, %s, %s)', self._repo, pr, shorten(message))
def close(self, pr):
self('PATCH', 'pulls/{}'.format(pr), json={'state': 'closed'})
def change_tags(self, pr, remove, add):
labels_endpoint = 'issues/{}/labels'.format(pr)
tags_before = {label['name'] for label in self('GET', labels_endpoint).json()}
tags_after = (tags_before - remove) | add
# replace labels entirely
self('PUT', labels_endpoint, json={'labels': list(tags_after)})
_logger.debug('change_tags(%s, %s, from=%s, to=%s)', self._repo, pr, tags_before, tags_after)
def _check_updated(self, branch, to):
"""
:return: nothing if successful, the incorrect HEAD otherwise
"""
r = self('get', 'git/refs/heads/{}'.format(branch), check=False)
if r.status_code == 200:
head = r.json()['object']['sha']
else:
head = '<Response [%s]: %s)>' % (r.status_code, r.text)
if head == to:
_logger.debug("Sanity check ref update of %s to %s: ok", branch, to)
return
_logger.warning(
"Sanity check ref update of %s, expected %s got %s (response-id %s)",
branch, to, head,
r.headers.get('x-github-request-id')
)
return head
def fast_forward(self, branch, sha):
try:
self('patch', 'git/refs/heads/{}'.format(branch), json={'sha': sha})
_logger.debug('fast_forward(%s, %s, %s) -> OK', self._repo, branch, sha)
@utils.backoff(exc=exceptions.FastForwardError)
def _wait_for_update():
if not self._check_updated(branch, sha):
return
raise exceptions.FastForwardError(self._repo) \
from Exception("timeout: never saw %s" % sha)
except requests.HTTPError as e:
_logger.debug('fast_forward(%s, %s, %s) -> ERROR', self._repo, branch, sha, exc_info=True)
if e.response.status_code == 422:
try:
r = e.response.json()
except Exception:
pass
else:
if isinstance(r, dict) and 'message' in r:
e = Exception(r['message'].lower())
raise exceptions.FastForwardError(self._repo) from e
def set_ref(self, branch, sha):
# force-update ref
r = self('patch', 'git/refs/heads/{}'.format(branch), json={
'sha': sha,
'force': True,
}, check=False)
status0 = r.status_code
_logger.debug(
'ref_set(%s, %s, %s -> %s (%s)',
self._repo, branch, sha, status0,
'OK' if status0 == 200 else r.text or r.reason
)
if status0 == 200:
@utils.backoff(exc=AssertionError)
def _wait_for_update():
head = self._check_updated(branch, sha)
assert not head, "Sanity check ref update of %s, expected %s got %s" % (
branch, sha, head
)
return
# 422 makes no sense but that's what github returns, leaving 404 just
# in case
if status0 in (404, 422):
# fallback: create ref
status1 = self.create_ref(branch, sha)
if status1 == 201:
return
else:
status1 = None
raise AssertionError("set_ref failed(%s, %s)" % (status0, status1))
def create_ref(self, branch, sha):
r = self('post', 'git/refs', json={
'ref': 'refs/heads/{}'.format(branch),
'sha': sha,
}, check=False)
status = r.status_code
_logger.debug(
'ref_create(%s, %s, %s) -> %s (%s)',
self._repo, branch, sha, status,
'OK' if status == 201 else r.text or r.reason
)
if status == 201:
@utils.backoff(exc=AssertionError)
def _wait_for_update():
head = self._check_updated(branch, sha)
assert not head, \
f"Sanity check ref update of {branch}, expected {sha} got {head}"
return status
def merge(self, sha, dest, message):
r = self('post', 'merges', json={
'base': dest,
'head': sha,
'commit_message': message,
}, check={409: MergeError})
try:
r = r.json()
except Exception:
raise MergeError("Got non-JSON reponse from github: %s %s (%s)" % (r.status_code, r.reason, r.text))
_logger.debug(
"merge(%s, %s (%s), %s) -> %s",
self._repo, dest, r['parents'][0]['sha'],
shorten(message), r['sha']
)
return dict(r['commit'], sha=r['sha'], parents=r['parents'])
def rebase(self, pr, dest, reset=False, commits=None):
""" Rebase pr's commits on top of dest, updates dest unless ``reset``
is set.
Returns the hash of the rebased head and a map of all PR commits (to the PR they were rebased to)
"""
logger = _logger.getChild('rebase')
original_head = self.head(dest)
if commits is None:
commits = self.commits(pr)
logger.debug("rebasing %s, %s on %s (reset=%s, commits=%s)",
self._repo, pr, dest, reset, len(commits))
assert commits, "can't rebase a PR with no commits"
prev = original_head
for original in commits:
assert len(original['parents']) == 1, "can't rebase commits with more than one parent"
tmp_msg = 'temp rebasing PR %s (%s)' % (pr, original['sha'])
merged = self.merge(original['sha'], dest, tmp_msg)
# whichever parent is not original['sha'] should be what dest
# deref'd to, and we want to check that matches the "left parent" we
# expect (either original_head or the previously merged commit)
[base_commit] = (parent['sha'] for parent in merged['parents']
if parent['sha'] != original['sha'])
assert prev == base_commit,\
"Inconsistent view of %s between head (%s) and merge (%s)" % (
dest, prev, base_commit,
)
prev = merged['sha']
original['new_tree'] = merged['tree']['sha']
prev = original_head
mapping = {}
for c in commits:
committer = c['commit']['committer']
committer.pop('date')
copy = self('post', 'git/commits', json={
'message': c['commit']['message'],
'tree': c['new_tree'],
'parents': [prev],
'author': c['commit']['author'],
'committer': committer,
}, check={409: MergeError}).json()
logger.debug('copied %s to %s (parent: %s)', c['sha'], copy['sha'], prev)
prev = mapping[c['sha']] = copy['sha']
if reset:
self.set_ref(dest, original_head)
else:
self.set_ref(dest, prev)
logger.debug('rebased %s, %s on %s (reset=%s, commits=%s) -> %s',
self._repo, pr, dest, reset, len(commits),
prev)
# prev is updated after each copy so it's the rebased PR head
return prev, mapping
# fetch various bits of issues / prs to load them
def pr(self, number):
return (
self('get', 'issues/{}'.format(number)).json(),
self('get', 'pulls/{}'.format(number)).json()
)
def comments(self, number):
for page in itertools.count(1):
r = self('get', 'issues/{}/comments'.format(number), params={'page': page})
yield from r.json()
if not r.links.get('next'):
return
def reviews(self, number):
for page in itertools.count(1):
r = self('get', 'pulls/{}/reviews'.format(number), params={'page': page})
yield from r.json()
if not r.links.get('next'):
return
def commits_lazy(self, pr):
for page in itertools.count(1):
r = self('get', 'pulls/{}/commits'.format(pr), params={'page': page})
yield from r.json()
if not r.links.get('next'):
return
def commits(self, pr):
""" Returns a PR's commits oldest first (that's what GH does &
is what we want)
"""
commits = list(self.commits_lazy(pr))
# map shas to the position the commit *should* have
idx = {
c: i
for i, c in enumerate(topological_sort({
c['sha']: [p['sha'] for p in c['parents']]
for c in commits
}))
}
return sorted(commits, key=lambda c: idx[c['sha']])
def statuses(self, h):
r = self('get', 'commits/{}/status'.format(h)).json()
return [{
'sha': r['sha'],
**s,
} for s in r['statuses']]
def shorten(s):
if not s:
return s
line1 = s.split('\n', 1)[0]
if len(line1) < 50:
return line1
return line1[:47] + '...'