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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import json
import socket
from etcd3gw.utils import _decode
from etcd3gw.utils import _encode
from etcd3gw.utils import _get_threadpool_executor
def _watch(resp, callback):
for line in resp.iter_content(chunk_size=None, decode_unicode=False):
decoded_line = line.decode('utf-8')
# Skip a possible empty line (only "\n")
# https://bugs.launchpad.net/python-etcd3gw/+bug/2072492
if not decoded_line.strip():
continue
payload = json.loads(decoded_line)
if 'created' in payload['result']:
if payload['result']['created']:
continue
else:
raise Exception('Unable to create watch')
if 'events' in payload['result']:
for event in payload['result']['events']:
event['kv']['key'] = _decode(event['kv']['key'])
if 'value' in event['kv']:
event['kv']['value'] = _decode(event['kv']['value'])
callback(event)
class Watcher(object):
KW_ARGS = ['start_revision', 'progress_notify', 'filters', 'prev_kv']
KW_ENCODED_ARGS = ['range_end']
def __init__(self, client, key, callback, **kwargs):
create_watch = {
'key': _encode(key)
}
for arg in kwargs:
if arg in self.KW_ARGS:
create_watch[arg] = kwargs[arg]
elif arg in self.KW_ENCODED_ARGS:
create_watch[arg] = _encode(kwargs[arg])
create_request = {
"create_request": create_watch
}
self._response = client.session.post(client.get_url('/watch'),
json=create_request,
stream=True)
clazz = _get_threadpool_executor()
self._executor = clazz(max_workers=2)
self._executor.submit(_watch, self._response, callback)
def stop(self):
try:
s = socket.fromfd(self._response.raw._fp.fileno(),
socket.AF_INET,
socket.SOCK_STREAM)
s.shutdown(socket.SHUT_RDWR)
s.close()
except Exception:
pass
self._response.connection.close()
self._executor.shutdown(wait=False)
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