cdist/cdist/trigger.py

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2019-01-26 16:00:03 +00:00
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# 2016 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist 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 General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
import ipaddress
import logging
import re
import socket
import http.server
import os
import socketserver
import shutil
import cdist.config
import cdist.log
import cdist.util.ipaddr as ipaddr
class Trigger():
"""cdist trigger handling"""
# Arguments that are only trigger specific
triggers_args = ["http_port", "ipv6", "directory", "source", ]
def __init__(self, http_port=None, dry_run=False, ipv6=False,
directory=None, source=None, cdistargs=None):
self.dry_run = dry_run
self.http_port = int(http_port)
self.ipv6 = ipv6
self.args = cdistargs
self.directory = directory
self.source = source
log.debug("IPv6: %s", self.ipv6)
def run_httpd(self):
server_address = ('', self.http_port)
if self.ipv6:
httpdcls = HTTPServerV6
else:
httpdcls = HTTPServerV4
httpd = httpdcls(self.args, self.directory, self.source,
server_address, TriggerHttp)
log.debug("Starting server at port %d", self.http_port)
if self.dry_run:
log.debug("Running in dry run mode")
httpd.serve_forever()
def run(self):
if self.http_port:
self.run_httpd()
@classmethod
def commandline(cls, args):
global log
# remove root logger default cdist handler and configure trigger's own
logging.getLogger().handlers = []
logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s')
log = logging.getLogger("trigger")
ownargs = {}
for targ in cls.triggers_args:
arg = getattr(args, targ)
ownargs[targ] = arg
del arg
t = cls(dry_run=args.dry_run, cdistargs=args, **ownargs)
t.run()
class TriggerHttp(http.server.BaseHTTPRequestHandler):
actions = {
"cdist": ["config", "install", ],
"file": ["present", "absent", ],
}
def do_HEAD(self):
self.dispatch_request()
def do_POST(self):
self.dispatch_request()
def do_GET(self):
self.dispatch_request()
def _actions_regex(self):
regex = ["^/(?P<subsystem>", ]
regex.extend("|".join(self.actions.keys()))
regex.append(")/(?P<action>")
regex.extend("|".join("|".join(self.actions[x]) for x in self.actions))
regex.append(")/")
return "".join(regex)
def dispatch_request(self):
host = self.client_address[0]
code = 200
message = None
self.cdistargs = self.server.cdistargs
actions_regex = self._actions_regex()
m = re.match(actions_regex, self.path)
if m:
subsystem = m.group('subsystem')
action = m.group('action')
handler = getattr(self, "handler_" + subsystem)
if action not in self.actions[subsystem]:
code = 404
else:
code = 404
if code == 200:
log.debug("Calling {} -> {}".format(subsystem, action))
try:
handler(action, host)
except cdist.Error as e:
# cdist is not broken, cdist run is broken
code = 599 # use arbitrary unassigned error code
message = str(e)
except Exception as e:
# cdist/trigger server is broken
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log.exception(e)
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code = 500
self.send_response(code=code, message=message)
self.end_headers()
def handler_file(self, action, host):
if not self.server.directory or not self.server.source:
log.info("Cannot serve file request: directory or source "
"not setup")
return
try:
ipaddress.ip_address(host)
except ValueError:
log.error("Host is not a valid IP address - aborting")
return
dst = os.path.join(self.server.directory, host)
if action == "present":
shutil.copyfile(self.server.source, dst)
if action == "absent":
if os.path.exists(dst):
os.remove(dst)
def handler_cdist(self, action, host):
log.debug("Running cdist action %s for %s", action, host)
if self.server.dry_run:
log.info("Dry run, skipping cdist execution")
return
cname = action.title()
module = getattr(cdist, action)
theclass = getattr(module, cname)
if hasattr(self.cdistargs, 'out_path'):
out_path = self.cdistargs.out_path
else:
out_path = None
host_base_path, hostdir = theclass.create_host_base_dirs(
host, theclass.create_base_root_path(out_path))
theclass.construct_remote_exec_copy_patterns(self.cdistargs)
host_tags = None
host_name = ipaddr.resolve_target_host_name(host)
log.debug('Resolved target host name: %s', host_name)
if host_name:
target_host = host_name
else:
target_host = host
log.debug('Using target_host: %s', target_host)
log.debug("Executing cdist onehost with params: %s, %s, %s, %s, %s, ",
target_host, host_tags, host_base_path, hostdir,
self.cdistargs)
theclass.onehost(target_host, host_tags, host_base_path, hostdir,
self.cdistargs, parallel=False)
class HTTPServerV6(socketserver.ForkingMixIn, http.server.HTTPServer):
"""
Server that listens to both IPv4 and IPv6 requests.
"""
address_family = socket.AF_INET6
def __init__(self, cdistargs, directory, source, *args, **kwargs):
self.cdistargs = cdistargs
self.dry_run = cdistargs.dry_run
self.directory = directory
self.source = source
http.server.HTTPServer.__init__(self, *args, **kwargs)
class HTTPServerV4(HTTPServerV6):
"""
Server that listens to IPv4 requests.
"""
address_family = socket.AF_INET