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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Simple CMS
#
# Copyright (C) 2011-2024 Michael Büsch <m@bues.ch>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# 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 General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys, os, fcntl, socket, time, pathlib, argparse
def get_backsock(rundir):
notify_socket = os.getenv("NOTIFY_SOCKET")
if notify_socket:
listen_fds = os.getenv("LISTEN_FDS")
if not listen_fds:
raise ValueError("env: LISTEN_FDS not set.")
listen_fds = int(listen_fds, 10)
if listen_fds <= 0 or listen_fds > 1:
raise ValueError("env: Invalid LISTEN_FDS.")
with socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM) as sdsock:
sdsock.connect(notify_socket)
fd = 3
for i in range(fd, fd + listen_fds):
fcntl.fcntl(i, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
backsock = socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM)
sdsock.sendall(b"READY=1")
return backsock
else:
backsock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
backsock.bind(str(rundir / "cms-backd.sock"))
backsock.listen()
return backsock
def run_backd(backsock, rundir):
debug = False
while True:
try:
conn, addr = backsock.accept()
if debug:
startStamp = time.monotonic()
msg = recv_message(conn, MAGIC_BACK)
except Exception as e:
print(f"cms-backd: Receive failed: {e}", file=sys.stderr)
time.sleep(0.1)
continue
status = 200 # Ok
reply_body = b""
reply_mime = ""
extra_headers = []
cms = CMS(domain="", rundir=rundir, debug=debug)
try:
if isinstance(msg, MsgGet):
cms.domain = msg.host
protocol = "https" if msg.https else "http"
reply_body, reply_mime = cms.get(msg.path, msg.query, protocol)
if "html" in reply_mime:
extra_headers.append("Cache-Control: max-age=10")
elif reply_mime.startswith("image/"):
extra_headers.append("Cache-Control: max-age=3600")
elif reply_mime.startswith("text/css"):
extra_headers.append("Cache-Control: max-age=600")
elif isinstance(msg, MsgPost):
cms.domain = msg.host
protocol = "https" if msg.https else "http"
reply_body, reply_mime = cms.post(msg.path, msg.query, msg.body, msg.body_mime, protocol)
extra_headers.append("Cache-Control: no-cache")
else:
raise RuntimeError("Received invalid message.")
except CMSException as e:
status = e.httpStatusCode
reply_body, reply_mime, extra_headers = cms.getErrorPage(e, protocol)
extra_headers.append("Cache-Control: no-store")
if debug:
delta = time.monotonic() - startStamp
us = round(delta * 1e6)
extra_headers.append(f"X-CMS-Py-Walltime: {us} us")
reply = MsgReply(
status=status,
body=reply_body,
mime=reply_mime,
extra_headers=extra_headers,
)
reply_data = reply.pack()
try:
conn.sendall(reply_data)
except Exception as e:
print(f"cms-backd: Failed to send reply: {e}", file=sys.stderr)
continue
if __name__ == "__main__":
p = argparse.ArgumentParser()
p.add_argument("--rundir", type=pathlib.Path,
default=pathlib.Path("/run"))
p.add_argument("--pythonpath", type=pathlib.Path,
default=pathlib.Path("/opt/cms/lib/python3/site-packages"))
p.add_argument("--no-cython", action="store_true")
args = p.parse_args()
sys.path.insert(0, str(args.pythonpath))
imported = False
if not args.no_cython:
try:
from cms_cython.socket import *
from cms_cython import CMS, CMSException
imported = True
except ImportError as e:
print("cms-backd: Failed to import cms_cython:", e, file=sys.stderr)
if not imported:
from cms.socket import *
from cms import CMS, CMSException
backsock = get_backsock(args.rundir)
run_backd(backsock, args.rundir)
# vim: ts=4 sw=4 expandtab
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