def ReadHttpResponse(conn, expect_status=200, ignore_404=True):
"""Reads an http response from a connection into a string buffer.
Args:
conn: An HTTPSConnection or HTTPConnection created by CreateHttpConn, above.
expect_status: Success is indicated by this status in the response.
ignore_404: For many requests, gerrit-on-borg will return 404 if the request
doesn't match the database contents. In most such cases, we
want the API to return None rather than raise an Exception.
Returns: A string buffer containing the connection's reply.
"""
sleep_time = 0.5
for idx in range(TRY_LIMIT):
response = conn.getresponse()
# Check if this is an authentication issue.
www_authenticate = response.getheader('www-authenticate')
if (response.status in (httplib.UNAUTHORIZED, httplib.FOUND) and
www_authenticate):
auth_match = re.search('realm="([^"]+)"', www_authenticate, re.I)
host = auth_match.group(1) if auth_match else conn.req_host
reason = ('Authentication failed. Please make sure your .netrc file '
'has credentials for %s' % host)
raise GerritAuthenticationError(response.status, reason)
# If response.status < 500 then the result is final; break retry loop.
if response.status < 500:
LOGGER.debug('got response %d for %s %s', response.status,
conn.req_params['method'], conn.req_params['url'])
break
# A status >=500 is assumed to be a possible transient error; retry.
http_version = 'HTTP/%s' % ('1.1' if response.version == 11 else '1.0')
LOGGER.warn('A transient error occurred while querying %s:\n'
'%s %s %s\n'
'%s %d %s',
conn.host, conn.req_params['method'], conn.req_params['url'],
http_version, http_version, response.status, response.reason)
if TRY_LIMIT - idx > 1:
LOGGER.warn('... will retry %d more times.', TRY_LIMIT - idx - 1)
time.sleep(sleep_time)
sleep_time = sleep_time * 2
req_host = conn.req_host
req_params = conn.req_params
conn = GetConnectionClass()(req_host)
conn.req_host = req_host
conn.req_params = req_params
conn.request(**req_params)
if ignore_404 and response.status == 404:
return StringIO()
if response.status != expect_status:
reason = '%s: %s' % (response.reason, response.read())
raise GerritError(response.status, reason)
return StringIO(response.read())
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