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python-zulip-api/bots/zephyr_mirror_backend.py
Tim Abbott 2ee0b3a079 zephyr_mirror: Add options to save/restore sessions. 
The davidben-patched-for-roost Zephyr branch (available at
https://github.com/davidben/zephyr/tree/roost) adds Zephyr support for
these options.  We also patch python-zephyr to expose them.  These
basically let you save your Zephyr tickets and port number to a file,
so that you can later restore them (even potentially after the machine
rebooted).  Basically because Zephyr is UDP, the Zephyr server will
continue trying to deliver messages to a particular port number that
was registered for up to 20 minutes after getting an error; so we can
even have downtime and reboot and still get our packets so long as we
restore the sessions within 20 minutes.

(imported from commit 986cbb157ddfa57aa4b644cd826f8418e9876dc7)
2013-08-26 18:17:25 -04:00

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#!/usr/bin/env python
# Copyright (C) 2012 Zulip, Inc.
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
try:
import simplejson
except ImportError:
import json as simplejson
import re
import time
import subprocess
import optparse
import os
import datetime
import textwrap
import signal
import logging
import hashlib
import tempfile
import random
import select
class CountingBackoff(object):
def __init__(self, maximum_retries=10):
self.number_of_retries = 0
self.maximum_retries = maximum_retries
def keep_going(self):
return self.number_of_retries < self.maximum_retries
def succeed(self):
self.number_of_retries = 0
def fail(self):
self.number_of_retries = min(self.number_of_retries + 1,
self.maximum_retries)
class RandomExponentialBackoff(CountingBackoff):
def fail(self):
self.number_of_retries = min(self.number_of_retries + 1,
self.maximum_retries)
# Exponential growth with ratio sqrt(2); compute random delay
# between x and 2x where x is growing exponentially
delay_scale = int(2 ** (self.number_of_retries / 2.0 - 1)) + 1
delay = delay_scale + random.randint(1, delay_scale)
message = "Sleeping for %ss [max %s] before retrying." % (delay, delay_scale * 2)
try:
logger.warning(message)
except NameError:
print message
time.sleep(delay)
DEFAULT_SITE = "https://api.zulip.com"
class States:
Startup, ZulipToZephyr, ZephyrToZulip, ChildSending = range(4)
CURRENT_STATE = States.Startup
def to_zulip_username(zephyr_username):
if "@" in zephyr_username:
(user, realm) = zephyr_username.split("@")
else:
(user, realm) = (zephyr_username, "ATHENA.MIT.EDU")
if realm.upper() == "ATHENA.MIT.EDU":
return user.lower() + "@mit.edu"
return user.lower() + "|" + realm.upper() + "@mit.edu"
def to_zephyr_username(zulip_username):
(user, realm) = zulip_username.split("@")
if "|" not in user:
return user.lower() + "@ATHENA.MIT.EDU"
match_user = re.match(r'([a-zA-Z0-9_]+)\|(.+)', user)
if not match_user:
raise Exception("Could not parse Zephyr realm for cross-realm user %s" % (zulip_username,))
return match_user.group(1).lower() + "@" + match_user.group(2).upper()
# Checks whether the pair of adjacent lines would have been
# linewrapped together, had they been intended to be parts of the same
# paragraph. Our check is whether if you move the first word on the
# 2nd line onto the first line, the resulting line is either (1)
# significantly shorter than the following line (which, if they were
# in the same paragraph, should have been wrapped in a way consistent
# with how the previous line was wrapped) or (2) shorter than 60
# characters (our assumed minimum linewrapping threshhold for Zephyr)
# or (3) the first word of the next line is longer than this entire
# line.
def different_paragraph(line, next_line):
words = next_line.split()
return (len(line + " " + words[0]) < len(next_line) * 0.8 or
len(line + " " + words[0]) < 50 or
len(line) < len(words[0]))
# Linewrapping algorithm based on:
# http://gcbenison.wordpress.com/2011/07/03/a-program-to-intelligently-remove-carriage-returns-so-you-can-paste-text-without-having-it-look-awful/
def unwrap_lines(body):
lines = body.split("\n")
result = ""
previous_line = lines[0]
for line in lines[1:]:
line = line.rstrip()
if (re.match(r'^\W', line, flags=re.UNICODE)
and re.match(r'^\W', previous_line, flags=re.UNICODE)):
result += previous_line + "\n"
elif (line == "" or
previous_line == "" or
re.match(r'^\W', line, flags=re.UNICODE) or
different_paragraph(previous_line, line)):
# Use 2 newlines to separate sections so that we
# trigger proper Markdown processing on things like
# bulleted lists
result += previous_line + "\n\n"
else:
result += previous_line + " "
previous_line = line
result += previous_line
return result
def send_zulip(zeph):
message = {}
if options.forward_class_messages:
message["forged"] = "yes"
message['type'] = zeph['type']
message['time'] = zeph['time']
message['sender'] = to_zulip_username(zeph['sender'])
if "subject" in zeph:
# Truncate the subject to the current limit in Zulip. No
# need to do this for stream names, since we're only
# subscribed to valid stream names.
message["subject"] = zeph["subject"][:60]
if zeph['type'] == 'stream':
# Forward messages sent to -c foo -i bar to stream bar subject "instance"
if zeph["stream"] == "message":
message['to'] = zeph['subject'].lower()
message['subject'] = "instance %s" % (zeph['subject'],)
elif zeph["stream"] == "tabbott-test5":
message['to'] = zeph['subject'].lower()
message['subject'] = "test instance %s" % (zeph['subject'],)
else:
message["to"] = zeph["stream"]
else:
message["to"] = zeph["recipient"]
message['content'] = unwrap_lines(zeph['content'])
if options.test_mode and options.site == DEFAULT_SITE:
logger.debug("Message is: %s" % (str(message),))
return {'result': "success"}
return zulip_client.send_message(message)
def send_error_zulip(error_msg):
message = {"type": "private",
"sender": zulip_account_email,
"to": zulip_account_email,
"content": error_msg,
}
zulip_client.send_message(message)
current_zephyr_subs = set()
def zephyr_bulk_subscribe(subs):
try:
zephyr._z.subAll(subs)
except IOError:
# Since we haven't added the subscription to
# current_zephyr_subs yet, we can just return (so that we'll
# continue processing normal messages) and we'll end up
# retrying the next time the bot checks its subscriptions are
# up to date.
logger.exception("Error subscribing to streams (will retry automatically):")
logger.warning("Streams were: %s" % ([cls for cls, instance, recipient in subs],))
return
try:
actual_zephyr_subs = [cls for (cls, _, _) in zephyr._z.getSubscriptions()]
except IOError:
logger.exception("Error getting current Zephyr subscriptions")
# Don't add anything to current_zephyr_subs so that we'll
# retry the next time we check for streams to subscribe to
# (within 15 seconds).
return
for (cls, instance, recipient) in subs:
if cls not in actual_zephyr_subs:
logger.error("Zephyr failed to subscribe us to %s; will retry" % (cls,))
try:
# We'll retry automatically when we next check for
# streams to subscribe to (within 15 seconds), but
# it's worth doing 1 retry immediately to avoid
# missing 15 seconds of messages on the affected
# classes
zephyr._z.sub(cls, instance, recipient)
except IOError:
pass
else:
current_zephyr_subs.add(cls)
def update_subscriptions():
try:
f = file(options.stream_file_path, "r")
public_streams = simplejson.loads(f.read())
f.close()
except:
logger.exception("Error reading public streams:")
return
classes_to_subscribe = set()
for stream in public_streams:
zephyr_class = stream.encode("utf-8")
if (options.shard is not None and
not hashlib.sha1(zephyr_class).hexdigest().startswith(options.shard)):
# This stream is being handled by a different zephyr_mirror job.
continue
if zephyr_class in current_zephyr_subs:
continue
classes_to_subscribe.add((zephyr_class, "*", "*"))
if len(classes_to_subscribe) > 0:
zephyr_bulk_subscribe(list(classes_to_subscribe))
def maybe_kill_child():
try:
if child_pid is not None:
os.kill(child_pid, signal.SIGTERM)
except OSError:
# We don't care if the child process no longer exists, so just log the error
logger.exception("")
def maybe_restart_mirroring_script():
if os.stat(os.path.join(options.root_path, "stamps", "restart_stamp")).st_mtime > start_time or \
((options.user == "tabbott" or options.user == "tabbott/extra") and
os.stat(os.path.join(options.root_path, "stamps", "tabbott_stamp")).st_mtime > start_time):
logger.warning("")
logger.warning("zephyr mirroring script has been updated; restarting...")
maybe_kill_child()
try:
zephyr._z.cancelSubs()
except IOError:
# We don't care whether we failed to cancel subs properly, but we should log it
logger.exception("")
while True:
try:
os.execvp(os.path.join(options.root_path, "user_root", "zephyr_mirror_backend.py"), sys.argv)
except Exception:
logger.exception("Error restarting mirroring script; trying again... Traceback:")
time.sleep(1)
def process_loop(log):
restart_check_count = 0
last_check_time = time.time()
while True:
select.select([zephyr._z.getFD()], [], [], 15)
try:
notice = zephyr.receive(block=False)
except Exception:
logger.exception("Error checking for new zephyrs:")
time.sleep(1)
continue
if notice is not None:
try:
process_notice(notice, log)
except Exception:
logger.exception("Error relaying zephyr:")
time.sleep(2)
if time.time() - last_check_time > 15:
last_check_time = time.time()
try:
maybe_restart_mirroring_script()
if restart_check_count > 0:
logger.info("Stopped getting errors checking whether restart is required.")
restart_check_count = 0
except Exception:
if restart_check_count < 5:
logger.exception("Error checking whether restart is required:")
restart_check_count += 1
if options.forward_class_messages:
try:
update_subscriptions()
except Exception:
logger.exception("Error updating subscriptions from Zulip:")
def parse_zephyr_body(zephyr_data):
try:
(zsig, body) = zephyr_data.split("\x00", 1)
except ValueError:
(zsig, body) = ("", zephyr_data)
return (zsig, body)
def parse_crypt_table(zephyr_class, instance):
try:
crypt_table = file(os.path.join(os.environ["HOME"], ".crypt-table"))
except IOError:
return None
for line in crypt_table.readlines():
if line.strip() == "":
# Ignore blank lines
continue
match = re.match("^crypt-(?P<class>[^:]+):\s+((?P<algorithm>(AES|DES)):\s+)?(?P<keypath>\S+)$", line)
if match is None:
# Malformed crypt_table line
logger.debug("Invalid crypt_table line!")
continue
groups = match.groupdict()
if groups['class'].lower() == zephyr_class and 'keypath' in groups and \
groups.get("algorithm") == "AES":
return groups["keypath"]
return None
def decrypt_zephyr(zephyr_class, instance, body):
keypath = parse_crypt_table(zephyr_class, instance)
if keypath is None:
# We can't decrypt it, so we just return the original body
return body
# Enable handling SIGCHLD briefly while we call into
# subprocess to avoid http://bugs.python.org/issue9127
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
# decrypt the message!
p = subprocess.Popen(["gpg",
"--decrypt",
"--no-options",
"--no-default-keyring",
"--keyring=/dev/null",
"--secret-keyring=/dev/null",
"--batch",
"--quiet",
"--no-use-agent",
"--passphrase-file",
keypath],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
decrypted, _ = p.communicate(input=body)
# Restore our ignoring signals
signal.signal(signal.SIGCHLD, signal.SIG_IGN)
return decrypted
def process_notice(notice, log):
(zsig, body) = parse_zephyr_body(notice.message)
is_personal = False
is_huddle = False
if notice.opcode == "PING":
# skip PING messages
return
zephyr_class = notice.cls.lower()
if notice.recipient != "":
is_personal = True
# Drop messages not to the listed subscriptions
if is_personal and not options.forward_personals:
return
if (zephyr_class not in current_zephyr_subs) and not is_personal:
logger.debug("Skipping ... %s/%s/%s" %
(zephyr_class, notice.instance, is_personal))
return
if notice.format.startswith("Zephyr error: See") or notice.format.endswith("@(@color(blue))"):
logger.debug("Skipping message we got from Zulip!")
return
if is_personal:
if body.startswith("CC:"):
is_huddle = True
# Map "CC: sipbtest espuser" => "starnine@mit.edu,espuser@mit.edu"
huddle_recipients = [to_zulip_username(x.strip()) for x in
body.split("\n")[0][4:].split()]
if notice.sender not in huddle_recipients:
huddle_recipients.append(to_zulip_username(notice.sender))
body = body.split("\n", 1)[1]
if options.forward_class_messages and notice.opcode.lower() == "crypt":
body = decrypt_zephyr(zephyr_class, notice.instance.lower(), body)
zeph = { 'time' : str(notice.time),
'sender' : notice.sender,
'zsig' : zsig, # logged here but not used by app
'content' : body }
if is_huddle:
zeph['type'] = 'private'
zeph['recipient'] = huddle_recipients
elif is_personal:
zeph['type'] = 'private'
zeph['recipient'] = to_zulip_username(notice.recipient)
else:
zeph['type'] = 'stream'
zeph['stream'] = zephyr_class
if notice.instance.strip() != "":
zeph['subject'] = notice.instance
else:
zeph["subject"] = '(instance "%s")' % (notice.instance,)
# Add instances in for instanced personals
if is_personal:
if notice.cls.lower() != "message" and notice.instance.lower != "personal":
heading = "[-c %s -i %s]\n" % (notice.cls, notice.instance)
elif notice.cls.lower() != "message":
heading = "[-c %s]\n" % (notice.cls,)
elif notice.instance.lower() != "personal":
heading = "[-i %s]\n" % (notice.instance,)
else:
heading = ""
zeph["content"] = heading + zeph["content"]
zeph = decode_unicode_byte_strings(zeph)
logger.info("Received a message on %s/%s from %s..." %
(zephyr_class, notice.instance, notice.sender))
if log is not None:
log.write(simplejson.dumps(zeph) + '\n')
log.flush()
if os.fork() == 0:
global CURRENT_STATE
CURRENT_STATE = States.ChildSending
# Actually send the message in a child process, to avoid blocking.
try:
res = send_zulip(zeph)
if res.get("result") != "success":
logger.error("Error relaying zephyr:\n%s\n%s" % (zeph, res))
except Exception:
logger.exception("Error relaying zephyr:")
finally:
os._exit(0)
def decode_unicode_byte_strings(zeph):
for field in zeph.keys():
if isinstance(zeph[field], str):
try:
decoded = zeph[field].decode("utf-8")
except Exception:
decoded = zeph[field].decode("iso-8859-1")
zeph[field] = decoded
return zeph
def quit_failed_initialization(message):
logger.error(message)
maybe_kill_child()
sys.exit(1)
def zephyr_init_autoretry():
backoff = RandomExponentialBackoff()
while backoff.keep_going():
try:
# zephyr.init() tries to clear old subscriptions, and thus
# sometimes gets a SERVNAK from the server
zephyr.init()
backoff.succeed()
return
except IOError:
logger.exception("Error initializing Zephyr library (retrying). Traceback:")
backoff.fail()
quit_failed_initialization("Could not initialize Zephyr library, quitting!")
def zephyr_load_session_autoretry(session_path):
backoff = RandomExponentialBackoff()
while backoff.keep_going():
try:
session = file(session_path, "r").read()
zephyr._z.initialize()
zephyr._z.load_session(session)
zephyr.__inited = True
return
except IOError:
logger.exception("Error loading saved Zephyr session (retrying). Traceback:")
backoff.fail()
quit_failed_initialization("Could not load saved Zephyr session, quitting!")
def zephyr_subscribe_autoretry(sub):
backoff = RandomExponentialBackoff()
while backoff.keep_going():
try:
zephyr.Subscriptions().add(sub)
backoff.succeed()
return
except IOError:
# Probably a SERVNAK from the zephyr server, but log the
# traceback just in case it's something else
logger.exception("Error subscribing to personals (retrying). Traceback:")
backoff.fail()
quit_failed_initialization("Could not subscribe to personals, quitting!")
def zephyr_to_zulip(options):
if options.use_sessions and os.path.exists(options.session_path):
logger.info("Loading old session")
zephyr_load_session_autoretry(options.session_path)
else:
zephyr_init_autoretry()
if options.forward_class_messages:
update_subscriptions()
if options.forward_personals:
# Subscribe to personals; we really can't operate without
# those subscriptions, so just retry until it works.
zephyr_subscribe_autoretry(("message", "*", "%me%"))
if subscribed_to_mail_messages():
zephyr_subscribe_autoretry(("mail", "inbox", "%me%"))
if options.use_sessions:
file(options.session_path, "w").write(zephyr._z.dump_session())
if options.resend_log_path is not None:
with open(options.resend_log_path, 'r') as log:
for ln in log:
try:
zeph = simplejson.loads(ln)
# New messages added to the log shouldn't have any
# elements of type str (they should already all be
# unicode), but older messages in the log are
# still of type str, so convert them before we
# send the message
zeph = decode_unicode_byte_strings(zeph)
# Handle importing older zephyrs in the logs
# where it isn't called a "stream" yet
if "class" in zeph:
zeph["stream"] = zeph["class"]
if "instance" in zeph:
zeph["subject"] = zeph["instance"]
logger.info("sending saved message to %s from %s..." %
(zeph.get('stream', zeph.get('recipient')),
zeph['sender']))
send_zulip(zeph)
except Exception:
logger.exception("Could not send saved zephyr:")
time.sleep(2)
logger.info("Successfully initialized; Starting receive loop.")
if options.log_path is not None:
with open(options.log_path, 'a') as log:
process_loop(log)
else:
process_loop(None)
def send_zephyr(zwrite_args, content):
p = subprocess.Popen(zwrite_args, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate(input=content.encode("utf-8"))
if p.returncode:
logger.error("zwrite command '%s' failed with return code %d:" % (
" ".join(zwrite_args), p.returncode,))
if stdout:
logger.info("stdout: " + stdout)
elif stderr:
logger.warning("zwrite command '%s' printed the following warning:" % (
" ".join(zwrite_args),))
if stderr:
logger.warning("stderr: " + stderr)
return (p.returncode, stderr)
def send_authed_zephyr(zwrite_args, content):
return send_zephyr(zwrite_args, content)
def send_unauthed_zephyr(zwrite_args, content):
return send_zephyr(zwrite_args + ["-d"], content)
def zcrypt_encrypt_content(zephyr_class, instance, content):
keypath = parse_crypt_table(zephyr_class, instance)
if keypath is None:
return None
# encrypt the message!
p = subprocess.Popen(["gpg",
"--symmetric",
"--no-options",
"--no-default-keyring",
"--keyring=/dev/null",
"--secret-keyring=/dev/null",
"--batch",
"--quiet",
"--no-use-agent",
"--armor",
"--cipher-algo", "AES",
"--passphrase-file",
keypath],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
encrypted, _ = p.communicate(input=content)
return encrypted
def forward_to_zephyr(message):
wrapper = textwrap.TextWrapper(break_long_words=False, break_on_hyphens=False)
wrapped_content = "\n".join("\n".join(wrapper.wrap(line))
for line in message["content"].replace("@", "@@").split("\n"))
zwrite_args = ["zwrite", "-n", "-s", message["sender_full_name"], "-F", "Zephyr error: See http://zephyr.1ts.org/wiki/df"]
if message['type'] == "stream":
zephyr_class = message["display_recipient"]
instance = message["subject"]
match_whitespace_instance = re.match(r'^\(instance "(\s*)"\)$', instance)
if match_whitespace_instance:
# Forward messages sent to '(instance "WHITESPACE")' back to the
# appropriate WHITESPACE instance for bidirectional mirroring
instance = match_whitespace_instance.group(1)
elif (instance == "instance %s" % (zephyr_class,) or
instance == "test instance %s" % (zephyr_class,)):
# Forward messages to e.g. -c -i white-magic back from the
# place we forward them to
if instance.startswith("test"):
instance = zephyr_class
zephyr_class = "tabbott-test5"
else:
instance = zephyr_class
zephyr_class = "message"
zwrite_args.extend(["-c", zephyr_class, "-i", instance])
logger.info("Forwarding message to class %s, instance %s" % (zephyr_class, instance))
elif message['type'] == "private":
if len(message['display_recipient']) == 1:
recipient = to_zephyr_username(message["display_recipient"][0]["email"])
recipients = [recipient]
elif len(message['display_recipient']) == 2:
recipient = ""
for r in message["display_recipient"]:
if r["email"].lower() != zulip_account_email.lower():
recipient = to_zephyr_username(r["email"])
break
recipients = [recipient]
else:
zwrite_args.extend(["-C"])
# We drop the @ATHENA.MIT.EDU here because otherwise the
# "CC: user1 user2 ..." output will be unnecessarily verbose.
recipients = [to_zephyr_username(user["email"]).replace("@ATHENA.MIT.EDU", "")
for user in message["display_recipient"]]
logger.info("Forwarding message to %s" % (recipients,))
zwrite_args.extend(recipients)
if message['type'] == "stream":
result = zcrypt_encrypt_content(zephyr_class, instance, wrapped_content)
if result is not None:
wrapped_content = result
zwrite_args.extend(["-O", "crypt"])
if options.test_mode:
logger.debug("Would have forwarded: %s\n%s" %
(zwrite_args, wrapped_content.encode("utf-8")))
return
heading = "Hi there! This is an automated message from Zulip."
support_closing = """If you have any questions, please be in touch through the \
Feedback tab or at support@zulip.com."""
(code, stderr) = send_authed_zephyr(zwrite_args, wrapped_content)
if code == 0 and stderr == "":
return
elif code == 0:
return send_error_zulip("""%s
Your last message was successfully mirrored to zephyr, but zwrite \
returned the following warning:
%s
%s""" % (heading, stderr, support_closing))
elif code != 0 and (stderr.startswith("zwrite: Ticket expired while sending notice to ") or
stderr.startswith("zwrite: No credentials cache found while sending notice to ")):
# Retry sending the message unauthenticated; if that works,
# just notify the user that they need to renew their tickets
(code, stderr) = send_unauthed_zephyr(zwrite_args, wrapped_content)
if code == 0:
return send_error_zulip("""%s
Your last message was forwarded from Zulip to Zephyr unauthenticated, \
because your Kerberos tickets have expired. It was sent successfully, \
but please renew your Kerberos tickets in the screen session where you \
are running the Zulip-Zephyr mirroring bot, so we can send \
authenticated Zephyr messages for you again.
%s""" % (heading, support_closing))
# zwrite failed and it wasn't because of expired tickets: This is
# probably because the recipient isn't subscribed to personals,
# but regardless, we should just notify the user.
return send_error_zulip("""%s
Your Zulip-Zephyr mirror bot was unable to forward that last message \
from Zulip to Zephyr. That means that while Zulip users (like you) \
received it, Zephyr users did not. The error message from zwrite was:
%s
%s""" % (heading, stderr, support_closing))
def maybe_forward_to_zephyr(message):
if (message["sender_email"] == zulip_account_email):
if not ((message["type"] == "stream") or
(message["type"] == "private" and
False not in [u["email"].lower().endswith("mit.edu") for u in
message["display_recipient"]])):
# Don't try forward private messages with non-MIT users
# to MIT Zephyr.
return
timestamp_now = datetime.datetime.now().strftime("%s")
if float(message["timestamp"]) < float(timestamp_now) - 15:
logger.warning("Skipping out of order message: %s < %s" %
(message["timestamp"], timestamp_now))
return
try:
forward_to_zephyr(message)
except Exception:
# Don't let an exception forwarding one message crash the
# whole process
logger.exception("Error forwarding message:")
def zulip_to_zephyr(options):
# Sync messages from zephyr to zulip
logger.info("Starting syncing messages.")
while True:
try:
zulip_client.call_on_each_message(maybe_forward_to_zephyr)
except Exception:
logger.exception("Error syncing messages:")
time.sleep(1)
def subscribed_to_mail_messages():
# In case we have lost our AFS tokens and those won't be able to
# parse the Zephyr subs file, first try reading in result of this
# query from the environment so we can avoid the filesystem read.
stored_result = os.environ.get("HUMBUG_FORWARD_MAIL_ZEPHYRS")
if stored_result is not None:
return stored_result == "True"
for (cls, instance, recipient) in parse_zephyr_subs(verbose=False):
if (cls.lower() == "mail" and instance.lower() == "inbox"):
os.environ["HUMBUG_FORWARD_MAIL_ZEPHYRS"] = "True"
return True
os.environ["HUMBUG_FORWARD_MAIL_ZEPHYRS"] = "False"
return False
def add_zulip_subscriptions(verbose):
zephyr_subscriptions = set()
skipped = set()
for (cls, instance, recipient) in parse_zephyr_subs(verbose=verbose):
if cls.lower() == "message":
if recipient != "*":
# We already have a (message, *, you) subscription, so
# these are redundant
continue
# We don't support subscribing to (message, *)
if instance == "*":
if recipient == "*":
skipped.add((cls, instance, recipient, "subscribing to all of class message is not supported."))
continue
# If you're on -i white-magic on zephyr, get on stream white-magic on zulip
# instead of subscribing to stream "message" on zulip
zephyr_subscriptions.add(instance)
continue
elif cls.lower() == "mail" and instance.lower() == "inbox":
# We forward mail zephyrs, so no need to log a warning.
continue
elif len(cls) > 30:
skipped.add((cls, instance, recipient, "Class longer than 30 characters"))
continue
elif instance != "*":
skipped.add((cls, instance, recipient, "Unsupported non-* instance"))
continue
elif recipient != "*":
skipped.add((cls, instance, recipient, "Unsupported non-* recipient."))
continue
zephyr_subscriptions.add(cls)
if len(zephyr_subscriptions) != 0:
res = zulip_client.add_subscriptions(list({"name": stream} for stream in zephyr_subscriptions),
authorization_errors_fatal=False)
if res.get("result") != "success":
logger.error("Error subscribing to streams:\n%s" % (res["msg"],))
return
already = res.get("already_subscribed")
new = res.get("subscribed")
unauthorized = res.get("unauthorized")
if verbose:
if already is not None and len(already) > 0:
logger.info("\nAlready subscribed to: %s" % (", ".join(already.values()[0]),))
if new is not None and len(new) > 0:
logger.info("\nSuccessfully subscribed to: %s" % (", ".join(new.values()[0]),))
if unauthorized is not None and len(unauthorized) > 0:
logger.info("\n" + "\n".join(textwrap.wrap("""\
The following streams you have NOT been subscribed to,
because they have been configured in Zulip as invitation-only streams.
This was done at the request of users of these Zephyr classes, usually
because traffic to those streams is sent within the Zephyr world encrypted
via zcrypt (in Zulip, we achieve the same privacy goals through invitation-only streams).
If you wish to read these streams in Zulip, you need to contact the people who are
on these streams and already use Zulip. They can subscribe you to them via the
"streams" page in the Zulip web interface:
""")) + "\n\n %s" % (", ".join(unauthorized),))
if len(skipped) > 0:
if verbose:
logger.info("\n" + "\n".join(textwrap.wrap("""\
You have some lines in ~/.zephyr.subs that could not be
synced to your Zulip subscriptions because they do not
use "*" as both the instance and recipient and not one of
the special cases (e.g. personals and mail zephyrs) that
Zulip has a mechanism for forwarding. Zulip does not
allow subscribing to only some subjects on a Zulip
stream, so this tool has not created a corresponding
Zulip subscription to these lines in ~/.zephyr.subs:
""")) + "\n")
for (cls, instance, recipient, reason) in skipped:
if verbose:
if reason != "":
logger.info(" [%s,%s,%s] (%s)" % (cls, instance, recipient, reason))
else:
logger.info(" [%s,%s,%s]" % (cls, instance, recipient))
if len(skipped) > 0:
if verbose:
logger.info("\n" + "\n".join(textwrap.wrap("""\
If you wish to be subscribed to any Zulip streams related
to these .zephyrs.subs lines, please do so via the Zulip
web interface.
""")) + "\n")
def valid_stream_name(name):
return name != ""
def parse_zephyr_subs(verbose=False):
zephyr_subscriptions = set()
subs_file = os.path.join(os.environ["HOME"], ".zephyr.subs")
if not os.path.exists(subs_file):
if verbose:
logger.error("Couldn't find ~/.zephyr.subs!")
return []
for line in file(subs_file, "r").readlines():
line = line.strip()
if len(line) == 0:
continue
try:
(cls, instance, recipient) = line.split(",")
cls = cls.replace("%me%", options.user)
instance = instance.replace("%me%", options.user)
recipient = recipient.replace("%me%", options.user)
if not valid_stream_name(cls):
if verbose:
logger.error("Skipping subscription to unsupported class name: [%s]" % (line,))
continue
except Exception:
if verbose:
logger.error("Couldn't parse ~/.zephyr.subs line: [%s]" % (line,))
continue
zephyr_subscriptions.add((cls.strip(), instance.strip(), recipient.strip()))
return zephyr_subscriptions
def open_logger():
if options.forward_class_messages:
if options.test_mode:
log_file = "/home/humbug/test-mirror-log"
else:
log_file = "/home/humbug/mirror-log"
else:
f = tempfile.NamedTemporaryFile(prefix="zulip-log.%s." % (options.user,),
delete=False)
log_file = f.name
# Close the file descriptor, since the logging system will
# reopen it anyway.
f.close()
logger = logging.getLogger(__name__)
log_format = "%(asctime)s <initial>: %(message)s"
formatter = logging.Formatter(log_format)
logging.basicConfig(format=log_format)
logger.setLevel(logging.DEBUG)
file_handler = logging.FileHandler(log_file)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)
return logger
def configure_logger(logger, direction_name):
if direction_name is None:
log_format = "%(message)s"
else:
log_format = "%(asctime)s [" + direction_name + "] %(message)s"
formatter = logging.Formatter(log_format)
# Replace the formatters for the file and stdout loggers
for handler in logger.handlers:
handler.setFormatter(formatter)
root_logger = logging.getLogger()
for handler in root_logger.handlers:
handler.setFormatter(formatter)
def parse_args():
parser = optparse.OptionParser()
parser.add_option('--forward-class-messages',
default=False,
help=optparse.SUPPRESS_HELP,
action='store_true')
parser.add_option('--shard',
help=optparse.SUPPRESS_HELP)
parser.add_option('--noshard',
default=False,
help=optparse.SUPPRESS_HELP,
action='store_true')
parser.add_option('--resend-log',
dest='resend_log_path',
help=optparse.SUPPRESS_HELP)
parser.add_option('--enable-log',
dest='log_path',
help=optparse.SUPPRESS_HELP)
parser.add_option('--stream-file-path',
dest='stream_file_path',
default="/home/humbug/public_streams",
help=optparse.SUPPRESS_HELP)
parser.add_option('--no-forward-personals',
dest='forward_personals',
help=optparse.SUPPRESS_HELP,
default=True,
action='store_false')
parser.add_option('--no-forward-from-zulip',
default=True,
dest='forward_from_zulip',
help=optparse.SUPPRESS_HELP,
action='store_false')
parser.add_option('--verbose',
default=False,
help=optparse.SUPPRESS_HELP,
action='store_true')
parser.add_option('--sync-subscriptions',
default=False,
action='store_true')
parser.add_option('--site',
default=DEFAULT_SITE,
help=optparse.SUPPRESS_HELP)
parser.add_option('--on-startup-command',
default=None,
help=optparse.SUPPRESS_HELP)
parser.add_option('--user',
default=os.environ["USER"],
help=optparse.SUPPRESS_HELP)
parser.add_option('--root-path',
default="/afs/athena.mit.edu/user/t/a/tabbott/for_friends",
help=optparse.SUPPRESS_HELP)
parser.add_option('--session-path',
default=None,
help=optparse.SUPPRESS_HELP)
parser.add_option('--use-sessions',
default=False,
action='store_true',
help=optparse.SUPPRESS_HELP)
parser.add_option('--test-mode',
default=False,
help=optparse.SUPPRESS_HELP,
action='store_true')
parser.add_option('--api-key-file',
default=os.path.join(os.environ["HOME"], "Private", ".humbug-api-key"))
return parser.parse_args()
def die_gracefully(signal, frame):
if CURRENT_STATE == States.ZulipToZephyr or CURRENT_STATE == States.ChildSending:
# this is a child process, so we want os._exit (no clean-up necessary)
os._exit(1)
if CURRENT_STATE == States.ZephyrToZulip and not options.use_sessions:
try:
# zephyr=>zulip processes may have added subs, so run cancelSubs
zephyr._z.cancelSubs()
except IOError:
# We don't care whether we failed to cancel subs properly, but we should log it
logger.exception("")
sys.exit(1)
if __name__ == "__main__":
# Set the SIGCHLD handler back to SIG_DFL to prevent these errors
# when importing the "requests" module after being restarted using
# the restart_stamp functionality:
#
# close failed in file object destructor:
# IOError: [Errno 10] No child processes
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
signal.signal(signal.SIGINT, die_gracefully)
(options, args) = parse_args()
logger = open_logger()
configure_logger(logger, "parent")
# The 'api' directory needs to go first, so that 'import zulip' won't pick
# up some other directory named 'humbug'.
pyzephyr_lib_path = "python-zephyr/build/lib.linux-%s-%s/" % (os.uname()[4], sys.version[0:3])
sys.path[:0] = [os.path.join(options.root_path, 'api'),
options.root_path,
os.path.join(options.root_path, "python-zephyr"),
os.path.join(options.root_path, pyzephyr_lib_path)]
# In case this is an automated restart of the mirroring script,
# and we have lost AFS tokens, first try reading the API key from
# the environment so that we can skip doing a filesystem read.
if os.environ.get("HUMBUG_API_KEY") is not None:
api_key = os.environ.get("HUMBUG_API_KEY")
else:
if not os.path.exists(options.api_key_file):
logger.error("\n" + "\n".join(textwrap.wrap("""\
Could not find API key file.
You need to either place your api key file at %s,
or specify the --api-key-file option.""" % (options.api_key_file,))))
sys.exit(1)
api_key = file(options.api_key_file).read().strip()
# Store the API key in the environment so that our children
# don't need to read it in
os.environ["HUMBUG_API_KEY"] = api_key
zulip_account_email = options.user + "@mit.edu"
import zulip
zulip_client = zulip.Client(
email=zulip_account_email,
api_key=api_key,
verbose=True,
client="zephyr_mirror",
site=options.site)
start_time = time.time()
if options.sync_subscriptions:
configure_logger(logger, None) # make the output cleaner
logger.info("Syncing your ~/.zephyr.subs to your Zulip Subscriptions!")
add_zulip_subscriptions(True)
sys.exit(0)
# Kill all zephyr_mirror processes other than this one and its parent.
if not options.test_mode:
pgrep_query = "python.*zephyr_mirror"
if options.shard is not None:
pgrep_query = "%s.*--shard=%s" % (pgrep_query, options.shard)
proc = subprocess.Popen(['pgrep', '-U', os.environ["USER"], "-f", pgrep_query],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, _err_unused = proc.communicate()
for pid in map(int, out.split()):
if pid == os.getpid() or pid == os.getppid():
continue
# Another copy of zephyr_mirror.py! Kill it.
logger.info("Killing duplicate zephyr_mirror process %s" % (pid,))
try:
os.kill(pid, signal.SIGINT)
except OSError:
# We don't care if the target process no longer exists, so just log the error
logger.exception("")
if options.shard is not None and set(options.shard) != set("a"):
# The shard that is all "a"s is the one that handles personals
# forwarding and zulip => zephyr forwarding
options.forward_personals = False
options.forward_from_zulip = False
if options.session_path is None:
options.session_path = "/var/tmp/%s" % (options.user,)
if options.forward_from_zulip:
child_pid = os.fork()
if child_pid == 0:
CURRENT_STATE = States.ZulipToZephyr
# Run the zulip => zephyr mirror in the child
configure_logger(logger, "zulip=>zephyr")
zulip_to_zephyr(options)
sys.exit(0)
else:
child_pid = None
CURRENT_STATE = States.ZephyrToZulip
import zephyr
logger_name = "zephyr=>zulip"
if options.shard is not None:
logger_name += "(%s)" % (options.shard,)
configure_logger(logger, logger_name)
# Have the kernel reap children for when we fork off processes to send Zulips
signal.signal(signal.SIGCHLD, signal.SIG_IGN)
zephyr_to_zulip(options)
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