def _check_cluster_id(self, response):
cluster_id = response.getheader("x-etcd-cluster-id")
if not cluster_id:
_log.warning("etcd response did not contain a cluster ID")
return
id_changed = (self.expected_cluster_id
and cluster_id != self.expected_cluster_id)
# Update the ID so we only raise the exception once.
old_expected_cluster_id = self.expected_cluster_id
self.expected_cluster_id = cluster_id
if id_changed:
# Defensive: clear the pool so that we connect afresh next
# time.
self.http.clear()
raise etcd.EtcdClusterIdChanged(
'The UUID of the cluster changed from {} to '
'{}.'.format(old_expected_cluster_id, cluster_id))
def api_execute(self, path, method, params=None, timeout=None):
""" Executes the query. """
some_request_failed = False
response = False
if timeout is None:
timeout = self.read_timeout
if timeout == 0:
timeout = None
if not path.startswith('/'):
raise ValueError('Path does not start with /')
while not response:
try:
url = self._base_uri + path
if (method == self._MGET) or (method == self._MDELETE):
response = self.http.request(method,
url,
timeout=timeout,
fields=params,
redirect=self.allow_redirect,
preload_content=False)
elif (method == self._MPUT) or (method == self._MPOST):
response = self.http.request_encode_body(
method,
url,
fields=params,
timeout=timeout,
encode_multipart=False,
redirect=self.allow_redirect,
preload_content=False)
else:
raise etcd.EtcdException(
'HTTP method {} not supported'.format(method))
# urllib3 doesn't wrap all httplib exceptions and earlier versions
# don't wrap socket errors either.
except (urllib3.exceptions.HTTPError, HTTPException,
socket.error) as e:
_log.error("Request to server %s failed: %r", self._base_uri,
e)
if self._allow_reconnect:
_log.info("Reconnection allowed, looking for another "
"server.")
# _next_server() raises EtcdException if there are no
# machines left to try, breaking out of the loop.
self._base_uri = self._next_server()
some_request_failed = True
else:
_log.debug("Reconnection disabled, giving up.")
raise etcd.EtcdConnectionFailed(
"Connection to etcd failed due to %r" % e)
except:
_log.exception("Unexpected request failure, re-raising.")
raise
else:
# Check the cluster ID hasn't changed under us. We use
# preload_content=False above so we can read the headers
# before we wait for the content of a long poll.
cluster_id = response.getheader("x-etcd-cluster-id")
id_changed = (self.expected_cluster_id
and cluster_id is not None
and cluster_id != self.expected_cluster_id)
# Update the ID so we only raise the exception once.
old_expected_cluster_id = self.expected_cluster_id
self.expected_cluster_id = cluster_id
if id_changed:
# Defensive: clear the pool so that we connect afresh next
# time.
self.http.clear()
raise etcd.EtcdClusterIdChanged(
'The UUID of the cluster changed from {} to '
'{}.'.format(old_expected_cluster_id, cluster_id))
if some_request_failed:
if not self._use_proxies:
# The cluster may have changed since last invocation
self._machines_cache = self.machines
self._machines_cache.remove(self._base_uri)
return self._handle_server_response(response)