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hooks_daemon.py
312 lines | 9.7 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2018 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
import os
import time
import logging
import tempfile
import traceback
import threading
from BaseHTTPServer import BaseHTTPRequestHandler
from SocketServer import TCPServer
import rhodecode
from rhodecode.model import meta
from rhodecode.lib.base import bootstrap_request, bootstrap_config
from rhodecode.lib import hooks_base
from rhodecode.lib.utils2 import AttributeDict
from rhodecode.lib.ext_json import json
from rhodecode.lib import rc_cache
log = logging.getLogger(__name__)
class HooksHttpHandler(BaseHTTPRequestHandler):
def do_POST(self):
method, extras = self._read_request()
txn_id = getattr(self.server, 'txn_id', None)
if txn_id:
log.debug('Computing TXN_ID based on `%s`:`%s`',
extras['repository'], extras['txn_id'])
computed_txn_id = rc_cache.utils.compute_key_from_params(
extras['repository'], extras['txn_id'])
if txn_id != computed_txn_id:
raise Exception(
'TXN ID fail: expected {} got {} instead'.format(
txn_id, computed_txn_id))
try:
result = self._call_hook(method, extras)
except Exception as e:
exc_tb = traceback.format_exc()
result = {
'exception': e.__class__.__name__,
'exception_traceback': exc_tb,
'exception_args': e.args
}
self._write_response(result)
def _read_request(self):
length = int(self.headers['Content-Length'])
body = self.rfile.read(length).decode('utf-8')
data = json.loads(body)
return data['method'], data['extras']
def _write_response(self, result):
self.send_response(200)
self.send_header("Content-type", "text/json")
self.end_headers()
self.wfile.write(json.dumps(result))
def _call_hook(self, method, extras):
hooks = Hooks()
try:
result = getattr(hooks, method)(extras)
finally:
meta.Session.remove()
return result
def log_message(self, format, *args):
"""
This is an overridden method of BaseHTTPRequestHandler which logs using
logging library instead of writing directly to stderr.
"""
message = format % args
log.debug(
"%s - - [%s] %s", self.client_address[0],
self.log_date_time_string(), message)
class DummyHooksCallbackDaemon(object):
hooks_uri = ''
def __init__(self):
self.hooks_module = Hooks.__module__
def __enter__(self):
log.debug('Running dummy hooks callback daemon')
return self
def __exit__(self, exc_type, exc_val, exc_tb):
log.debug('Exiting dummy hooks callback daemon')
class ThreadedHookCallbackDaemon(object):
_callback_thread = None
_daemon = None
_done = False
def __init__(self, txn_id=None, host=None, port=None):
self._prepare(txn_id=txn_id, host=None, port=port)
def __enter__(self):
self._run()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
log.debug('Callback daemon exiting now...')
self._stop()
def _prepare(self, txn_id=None, host=None, port=None):
raise NotImplementedError()
def _run(self):
raise NotImplementedError()
def _stop(self):
raise NotImplementedError()
class HttpHooksCallbackDaemon(ThreadedHookCallbackDaemon):
"""
Context manager which will run a callback daemon in a background thread.
"""
hooks_uri = None
# From Python docs: Polling reduces our responsiveness to a shutdown
# request and wastes cpu at all other times.
POLL_INTERVAL = 0.01
def _prepare(self, txn_id=None, host=None, port=None):
host = host or '127.0.0.1'
self._done = False
self._daemon = TCPServer((host, port or 0), HooksHttpHandler)
_, port = self._daemon.server_address
self.hooks_uri = '{}:{}'.format(host, port)
self.txn_id = txn_id
# inject transaction_id for later verification
self._daemon.txn_id = self.txn_id
log.debug(
"Preparing HTTP callback daemon at `%s` and registering hook object",
self.hooks_uri)
def _run(self):
log.debug("Running event loop of callback daemon in background thread")
callback_thread = threading.Thread(
target=self._daemon.serve_forever,
kwargs={'poll_interval': self.POLL_INTERVAL})
callback_thread.daemon = True
callback_thread.start()
self._callback_thread = callback_thread
def _stop(self):
log.debug("Waiting for background thread to finish.")
self._daemon.shutdown()
self._callback_thread.join()
self._daemon = None
self._callback_thread = None
if self.txn_id:
txn_id_file = get_txn_id_data_path(self.txn_id)
log.debug('Cleaning up TXN ID %s', txn_id_file)
if os.path.isfile(txn_id_file):
os.remove(txn_id_file)
log.debug("Background thread done.")
def get_txn_id_data_path(txn_id):
root = tempfile.gettempdir()
return os.path.join(root, 'rc_txn_id_{}'.format(txn_id))
def store_txn_id_data(txn_id, data_dict):
if not txn_id:
log.warning('Cannot store txn_id because it is empty')
return
path = get_txn_id_data_path(txn_id)
try:
with open(path, 'wb') as f:
f.write(json.dumps(data_dict))
except Exception:
log.exception('Failed to write txn_id metadata')
def get_txn_id_from_store(txn_id):
"""
Reads txn_id from store and if present returns the data for callback manager
"""
path = get_txn_id_data_path(txn_id)
try:
with open(path, 'rb') as f:
return json.loads(f.read())
except Exception:
return {}
def prepare_callback_daemon(extras, protocol, host, use_direct_calls, txn_id=None):
txn_details = get_txn_id_from_store(txn_id)
port = txn_details.get('port', 0)
if use_direct_calls:
callback_daemon = DummyHooksCallbackDaemon()
extras['hooks_module'] = callback_daemon.hooks_module
else:
if protocol == 'http':
callback_daemon = HttpHooksCallbackDaemon(
txn_id=txn_id, host=host, port=port)
else:
log.error('Unsupported callback daemon protocol "%s"', protocol)
raise Exception('Unsupported callback daemon protocol.')
extras['hooks_uri'] = callback_daemon.hooks_uri
extras['hooks_protocol'] = protocol
extras['time'] = time.time()
# register txn_id
extras['txn_id'] = txn_id
log.debug('Prepared a callback daemon: %s at url `%s`',
callback_daemon.__class__.__name__, callback_daemon.hooks_uri)
return callback_daemon, extras
class Hooks(object):
"""
Exposes the hooks for remote call backs
"""
def repo_size(self, extras):
log.debug("Called repo_size of %s object", self)
return self._call_hook(hooks_base.repo_size, extras)
def pre_pull(self, extras):
log.debug("Called pre_pull of %s object", self)
return self._call_hook(hooks_base.pre_pull, extras)
def post_pull(self, extras):
log.debug("Called post_pull of %s object", self)
return self._call_hook(hooks_base.post_pull, extras)
def pre_push(self, extras):
log.debug("Called pre_push of %s object", self)
return self._call_hook(hooks_base.pre_push, extras)
def post_push(self, extras):
log.debug("Called post_push of %s object", self)
return self._call_hook(hooks_base.post_push, extras)
def _call_hook(self, hook, extras):
extras = AttributeDict(extras)
server_url = extras['server_url']
request = bootstrap_request(application_url=server_url)
bootstrap_config(request) # inject routes and other interfaces
# inject the user for usage in hooks
request.user = AttributeDict({'username': extras.username,
'ip_addr': extras.ip,
'user_id': extras.user_id})
extras.request = request
try:
result = hook(extras)
except Exception as error:
exc_tb = traceback.format_exc()
log.exception('Exception when handling hook %s', hook)
error_args = error.args
return {
'status': 128,
'output': '',
'exception': type(error).__name__,
'exception_traceback': exc_tb,
'exception_args': error_args,
}
finally:
meta.Session.remove()
log.debug('Got hook call response %s', result)
return {
'status': result.status,
'output': result.output,
}
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
pass