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marathon_lb.py
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marathon_lb.py
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#!/usr/bin/env python3
"""# marathon-lb
### Overview
The marathon-lb is a service discovery and load balancing tool
for Marathon based on HAProxy. It reads the Marathon task information
and dynamically generates HAProxy configuration details.
To gather the task information, marathon-lb needs to know where
to find Marathon. The service configuration details are stored in labels.
Every service port in Marathon can be configured independently.
### Configuration
Service configuration lives in Marathon via labels.
Marathon-lb just needs to know where to find Marathon.
### Command Line Usage
"""
import argparse
import hashlib
import json
import logging
import os
import os.path
import random
import re
import shlex
import signal
import stat
import subprocess
import sys
import threading
import time
import datetime
import urllib.parse
from itertools import cycle
from collections import defaultdict
from operator import attrgetter
from shutil import move, copy
from tempfile import mkstemp
import dateutil.parser
import requests
import pycurl
import urllib3.exceptions
from common import (get_marathon_auth_params, set_logging_args,
set_marathon_auth_args, setup_logging, cleanup_json)
from config import ConfigTemplater, label_keys
from lrucache import LRUCache
from utils import (CurlHttpEventStream, get_task_ip_and_ports, ip_cache,
ServicePortAssigner)
logger = logging.getLogger('marathon_lb')
SERVICE_PORT_ASSIGNER = ServicePortAssigner()
class MarathonBackend(object):
def __init__(self, host, ip, port, draining):
self.host = host
"""
The host that is running this task.
"""
self.ip = ip
"""
The IP address used to access the task. For tasks using IP-per-task,
this is the actual IP address of the task; otherwise, it is the IP
address resolved from the hostname.
"""
self.port = port
"""
The port used to access a particular service on a task. For tasks
using IP-per-task, this is the actual port exposed by the task;
otherwise, it is the port exposed on the host.
"""
self.draining = draining
"""
Whether we should be draining access to this task in the LB.
"""
def __hash__(self):
return hash((self.host, self.port))
def __repr__(self):
return "MarathonBackend(%r, %r, %r)" % (self.host, self.ip, self.port)
class MarathonService(object):
def __init__(self, appId, servicePort, healthCheck, strictMode):
self.appId = appId
self.servicePort = servicePort
self.backends = set()
self.hostname = None
self.proxypath = None
self.revproxypath = None
self.redirpath = None
self.haproxy_groups = frozenset()
self.path = None
self.authRealm = None
self.authUser = None
self.authPasswd = None
self.sticky = False
self.enabled = not strictMode
self.redirectHttpToHttps = False
self.useHsts = False
self.sslCert = None
self.bindOptions = None
self.bindAddr = '*'
self.groups = frozenset()
self.mode = None
self.balance = 'roundrobin'
self.healthCheck = healthCheck
self.labels = {}
self.backend_weight = 0
self.network_allowed = None
self.healthcheck_port_index = None
if healthCheck:
if healthCheck['protocol'] == 'HTTP':
self.mode = 'http'
def add_backend(self, host, ip, port, draining):
self.backends.add(MarathonBackend(host, ip, port, draining))
def __hash__(self):
return hash(self.servicePort)
def __eq__(self, other):
return self.servicePort == other.servicePort
def __repr__(self):
return "MarathonService(%r, %r)" % (self.appId, self.servicePort)
class MarathonApp(object):
def __init__(self, marathon, appId, app):
self.app = app
self.groups = frozenset()
self.appId = appId
# port -> MarathonService
self.services = dict()
def __hash__(self):
return hash(self.appId)
def __eq__(self, other):
return self.appId == other.appId
class Marathon(object):
class AllHostsTimeout(Exception):
pass
def __init__(self, hosts, health_check, strict_mode, auth, ca_cert=None):
# TODO(cmaloney): Support getting master list from zookeeper
self.__hosts = hosts
self.__health_check = health_check
self.__strict_mode = strict_mode
self.__auth = auth
self.__cycle_hosts = cycle(self.__hosts)
self.__verify = False
self.current_host = None
if ca_cert:
self.__verify = ca_cert
logger.info('Initializing Marathon connection via hosts: %s',
self.__hosts)
def api_req_raw(self, method, path, auth, body=None, **kwargs):
for i, host in enumerate(self.__hosts):
path_str = os.path.join(host, 'v2', *path)
logger.info('Calling %s %s.', method, path_str)
try:
response = requests.request(
method,
path_str,
auth=auth,
headers={
'Accept': 'application/json',
'Content-Type': 'application/json'
},
timeout=(3.05, 46),
**kwargs
)
logger.debug("%s %s", method, response.url)
if response.ok and i != 0:
# stick to the host with the last successful requests
self.__hosts = self.__hosts[i:] + self.__hosts[:i]
resp_json = cleanup_json(response.json())
if 'message' in resp_json:
response.reason = "%s (%s)" % (
response.reason,
resp_json['message'])
return response
except (requests.exceptions.Timeout,
urllib3.exceptions.TimeoutError,
urllib3.exceptions.MaxRetryError,
IOError):
logger.info('Error calling %s %s, trying next host.',
method, path_str)
logger.debug("%s %s", method, path_str, exc_info=True)
raise self.AllHostsTimeout()
def api_req(self, method, path, **kwargs):
data = self.api_req_raw(method, path, self.__auth,
verify=self.__verify, **kwargs).json()
return cleanup_json(data)
def create(self, app_json):
return self.api_req('POST', ['apps'], app_json)
def get_app(self, appid):
logger.info('fetching app %s', appid)
return self.api_req('GET', ['apps', appid])["app"]
# Lists all running apps.
def list(self):
logger.info('fetching apps')
return self.api_req('GET', ['apps'],
params={'embed': 'apps.tasks'})["apps"]
def health_check(self):
return self.__health_check
def strict_mode(self):
return self.__strict_mode
def tasks(self):
logger.info('fetching tasks')
return self.api_req('GET', ['tasks'])["tasks"]
def get_event_stream(self, events):
self.current_host = self.host
params = {
'plan-format': 'light'
}
if events:
params['event_type'] = events
url_params = urllib.parse.urlencode(params, doseq=True)
url = '{}/v2/events?{}'.format(self.current_host, url_params)
return CurlHttpEventStream(url, self.__auth, self.__verify)
def iter_events(self, stream):
logger.info(
"SSE Active, trying fetch events from {0}".format(stream.url))
class Event(object):
def __init__(self, data):
self.data = data
for line in stream.iter_lines():
if line.strip() != '':
for real_event_data in re.split(r'\r\n',
line.decode('utf-8')):
if real_event_data[:6] == "data: ":
event = Event(data=real_event_data[6:])
yield event
@property
def host(self):
return next(self.__cycle_hosts)
def has_group(groups, app_groups):
# All groups / wildcard match
if '*' in groups:
return True
# empty group only
if len(groups) == 0 and len(app_groups) == 0:
raise Exception("No groups specified")
# Contains matching groups
if (len(frozenset(app_groups) & groups)):
return True
return False
def get_backend_port(apps, app, idx):
"""
Return the port of the idx-th backend of the app which index in apps
is defined by app.healthcheck_port_index.
Example case:
We define an app mapping two ports: 9000 and 9001, that we
scaled to 3 instances.
The port 9000 is used for the app itself, and the port 9001
is used for the app healthchecks. Hence, we have 2 apps
at the marathon level, each with 3 backends (one for each
container).
If app.healthcheck_port_index is set to 1 (via the
HAPROXY_0_BACKEND_HEALTHCHECK_PORT_INDEX label), then
get_backend_port(apps, app, 3) will return the port of the 3rd
backend of the second app.
See https://github.com/mesosphere/marathon-lb/issues/198 for the
actual use case.
Note: if app.healthcheck_port_index has a out of bounds value,
then the app idx-th backend is returned instead.
"""
def get_backends(app):
key_func = attrgetter('host', 'port')
return sorted(list(app.backends), key=key_func)
apps = [_app for _app in apps if _app.appId == app.appId]
# If no healthcheck port index is defined, or if its value is nonsense
# simply return the app port
if app.healthcheck_port_index is None \
or abs(app.healthcheck_port_index) > len(apps):
return get_backends(app)[idx].port
# If a healthcheck port index is defined, fetch the app corresponding
# to the argument app healthcheck port index,
# and return its idx-th backend port
apps = sorted(apps, key=attrgetter('appId', 'servicePort'))
backends = get_backends(apps[app.healthcheck_port_index])
return backends[idx].port
def _get_health_check_options(template, health_check, health_check_port):
return template.format(
healthCheck=health_check,
healthCheckPortIndex=health_check.get('portIndex'),
healthCheckPort=health_check_port,
healthCheckProtocol=health_check['protocol'],
healthCheckPath=health_check.get('path', '/'),
healthCheckTimeoutSeconds=health_check['timeoutSeconds'],
healthCheckIntervalSeconds=health_check['intervalSeconds'],
healthCheckGracePeriodSeconds=health_check['gracePeriodSeconds'],
healthCheckMaxConsecutiveFailures=health_check[
'maxConsecutiveFailures'],
healthCheckFalls=health_check['maxConsecutiveFailures'] + 1,
healthCheckPortOptions=' port ' + str(
health_check_port) if health_check_port else ''
)
def mergeVhostTable(left, right):
result = left.copy()
for key in right:
if key in result:
result[key][0].extend(right[key][0])
result[key][1].update(right[key][1])
result[key][2].update(right[key][2])
else:
result[key] = right[key]
return result
def calculate_server_id(server_name, taken_server_ids):
"""Calculate a stable server id given server name
Calculates stable server id [1] for the given server name [2]
which has following properties:
* is unique/has not been assigned yet
* is an integer from the range 1-32767
* is stable - i.e. calling this function repeatably with the same
server name must yield the same server id.
THE STABILITY OF SERVER_ID IS GUARANTEED IF THE ORDER OF CALLS OF THIS
FUNCTION IS PRESERVED, I.E. THE BACKEND LIST IS SORTED BEFORE
PROCESSING
[1] http://cbonte.github.io/haproxy-dconv/1.8/configuration.html#5.2-id
[2] http://cbonte.github.io/haproxy-dconv/1.8/configuration.html#5.2
Args:
server_name(str): the name of the given backend server
taken_server_ids(set): list of allready assigned server ids
Returns:
An integer depicting the server ID
"""
if server_name == '' or server_name is None:
raise ValueError("Malformed server name: {}".format(server_name))
server_name_encoded = server_name.encode('utf-8')
server_name_shasum = hashlib.sha256(server_name_encoded).hexdigest()
# The number 32767 is not coincidental. It is very important to notice
# in [1] that:
# * due to the use of atol() call [2], server id must not exceed the length
# of 'long int' on a given platform. According to [3] it is at
# least 32bits long so 32bits is a safe limit.
# * the atol() call returns `long int` which is assigned to puid var which
# int turn is `int`. As per [4]:
#
# ```
# On a system where long is wider than int, if the value won't fit in an
# int, then the result of the conversion is implementation-defined. (Or,
# starting in C99, it can raise an implementation-defined signal, but I
# don't know of any compilers that actually do that.) What typically
# happens is that the high-order bits are discarded, but you shouldn't
# depend on that. (The rules are different for unsigned types; the result
# of converting a signed or unsigned integer to an unsigned type is well
# defined.)
# ```
#
# So we need to assume that server id is 16 bit signed integer. Server id
# must be a positive number so this gives us at most 2**15-1 = 32767
# possible server IDs. Beyond that there are dragons and the undefined
# behaviour of the C compiler ;)
#
# [1] https://github.com/haproxy/haproxy/blob/c55b88ece616afe0b28dc81eb39bad37b5f9c33f/src/server.c#L359-L388 # noqa: E501
# [2] https://github.com/haproxy/haproxy/blob/c55b88ece616afe0b28dc81eb39bad37b5f9c33f/src/server.c#L368 # noqa: E501
# [3] https://en.wikipedia.org/wiki/C_data_types
# [4] https://stackoverflow.com/a/13652624
server_id = int(server_name_shasum, 16) % 32767
if server_id not in taken_server_ids and server_id > 0:
taken_server_ids.add(server_id)
return server_id
# We try to solve the collisions by recursively calling
# calculate_backend_id() with the server name argument set to the initial
# server name plus the calculated `server_name_shasum` appended to it.
# This way we should get stable IDs during the next haproxy
# reconfiguration. The more backends there are the more likely the
# collisions will get. Initially the probability is 1/(2**15-1) * 100 =
# 0.003%. As the new_server_id gets longer the sha sum calculation will be
# getting more CPU-heavy and the number of SHA sum calculations per backend
# server will increase. Still - it is unlikely that we will hit the number
# backend server that will this approach a problem - the number of backend
# servers would need to be in the order of thousands.
new_server_name = "{0} {1}".format(server_name, server_name_shasum)
if server_id == 0:
msg_fmt = ("server id == 0 for `%s`, retrying with `%s`")
logger.info(msg_fmt, server_name, new_server_name)
else:
msg_fmt = ("server id collision for `%s`: `%d` was already assigned, "
"retrying with `%s`")
logger.info(msg_fmt, server_name, server_id, new_server_name)
return calculate_server_id(new_server_name, taken_server_ids)
def config(apps, groups, bind_http_https, ssl_certs, templater,
haproxy_map=False, domain_map_array=[], app_map_array=[],
config_file="/etc/haproxy/haproxy.cfg",
group_https_by_vhosts=False):
logger.info("generating config")
config = templater.haproxy_head
groups = frozenset(groups)
duplicate_map = {}
# do not repeat use backend multiple times since map file is same.
_ssl_certs = ssl_certs or "/etc/ssl/cert.pem"
_ssl_certs = _ssl_certs.split(",")
if bind_http_https:
http_frontends = templater.haproxy_http_frontend_head
if group_https_by_vhosts:
https_frontends = templater.haproxy_https_grouped_frontend_head
else:
https_frontends = templater.haproxy_https_frontend_head.format(
sslCerts=" ".join(map(lambda cert: "crt " + cert, _ssl_certs))
)
# This should handle situations where customers have a custom HAPROXY_HEAD
# that includes the 'daemon' flag or does not expose listener fds:
if 'daemon' in config.split() or "expose-fd listeners" not in config:
upgrade_warning = '''\
Error in custom HAPROXY_HEAD template: \
In Marathon-LB 1.12, the default HAPROXY_HEAD section changed, please \
make the following changes to your custom template: Remove "daemon", \
Add "stats socket /var/run/haproxy/socket expose-fd listeners". \
More information can be found here: \
https://docs.mesosphere.com/services/marathon-lb/advanced/#global-template.\
'''
raise Exception(upgrade_warning)
userlists = str()
frontends = str()
backends = str()
http_appid_frontends = templater.haproxy_http_frontend_appid_head
apps_with_http_appid_backend = []
http_frontend_list = []
https_frontend_list = []
https_grouped_frontend_list = defaultdict(lambda: ([], set(), set()))
haproxy_dir = os.path.dirname(config_file)
logger.debug("HAProxy dir is %s", haproxy_dir)
for app in sorted(apps, key=attrgetter('appId', 'servicePort')):
# App only applies if we have it's group
# Check if there is a haproxy group associated with service group
# if not fallback to original HAPROXY group.
# This is added for backward compatability with HAPROXY_GROUP
if app.haproxy_groups:
if not has_group(groups, app.haproxy_groups):
continue
else:
if not has_group(groups, app.groups):
continue
# Skip if it's not actually enabled
if not app.enabled:
continue
logger.debug("configuring app %s", app.appId)
if len(app.backends) < 1:
logger.error("skipping app %s as it is not valid to generate" +
" backend without any server entries!", app.appId)
continue
backend = app.appId[1:].replace('/', '_') + '_' + str(app.servicePort)
logger.debug("frontend at %s:%d with backend %s",
app.bindAddr, app.servicePort, backend)
# If app has HAPROXY_{n}_MODE set, use that setting.
# Otherwise use 'http' if HAPROXY_{N}_VHOST is set, and 'tcp' if not.
if app.mode is None:
if app.hostname:
app.mode = 'http'
else:
app.mode = 'tcp'
if app.authUser:
userlist_head = templater.haproxy_userlist_head(app)
userlists += userlist_head.format(
backend=backend,
user=app.authUser,
passwd=app.authPasswd
)
frontend_head = templater.haproxy_frontend_head(app)
frontends += frontend_head.format(
bindAddr=app.bindAddr,
backend=backend,
servicePort=app.servicePort,
mode=app.mode,
sslCert=' ssl crt ' + app.sslCert if app.sslCert else '',
bindOptions=' ' + app.bindOptions if app.bindOptions else ''
)
backend_head = templater.haproxy_backend_head(app)
backends += backend_head.format(
backend=backend,
balance=app.balance,
mode=app.mode
)
# if a hostname is set we add the app to the vhost section
# of our haproxy config
# TODO(lloesche): Check if the hostname is already defined by another
# service
if bind_http_https and app.hostname:
backend_weight, p_fe, s_fe, g_fe = \
generateHttpVhostAcl(templater,
app,
backend,
haproxy_map,
domain_map_array,
haproxy_dir,
duplicate_map)
http_frontend_list.append((backend_weight, p_fe))
https_frontend_list.append((backend_weight, s_fe))
if group_https_by_vhosts:
https_grouped_frontend_list = mergeVhostTable(
https_grouped_frontend_list, g_fe)
# if app mode is http, we add the app to the second http frontend
# selecting apps by http header X-Marathon-App-Id
if app.mode == 'http' and \
app.appId not in apps_with_http_appid_backend:
logger.debug("adding virtual host for app with id %s", app.appId)
# remember appids to prevent multiple entries for the same app
apps_with_http_appid_backend += [app.appId]
cleanedUpAppId = re.sub(r'[^a-zA-Z0-9\-]', '_', app.appId)
if haproxy_map:
if 'map_http_frontend_appid_acl' not in duplicate_map:
http_appid_frontend_acl = templater \
.haproxy_map_http_frontend_appid_acl(app)
http_appid_frontends += http_appid_frontend_acl.format(
haproxy_dir=haproxy_dir
)
duplicate_map['map_http_frontend_appid_acl'] = 1
map_element = {}
map_element[app.appId] = backend
if map_element not in app_map_array:
app_map_array.append(map_element)
else:
http_appid_frontend_acl = templater \
.haproxy_http_frontend_appid_acl(app)
http_appid_frontends += http_appid_frontend_acl.format(
cleanedUpAppId=cleanedUpAppId,
hostname=app.hostname,
appId=app.appId,
backend=backend
)
if app.mode == 'http':
if app.useHsts:
backends += templater.haproxy_backend_hsts_options(app)
backends += templater.haproxy_backend_http_options(app)
backend_http_backend_proxypass = templater \
.haproxy_http_backend_proxypass_glue(app)
if app.proxypath:
backends += backend_http_backend_proxypass.format(
hostname=app.hostname,
proxypath=app.proxypath
)
backend_http_backend_revproxy = templater \
.haproxy_http_backend_revproxy_glue(app)
if app.revproxypath:
backends += backend_http_backend_revproxy.format(
hostname=app.hostname,
rootpath=app.revproxypath
)
backend_http_backend_redir = templater \
.haproxy_http_backend_redir(app)
if app.redirpath:
backends += backend_http_backend_redir.format(
hostname=app.hostname,
redirpath=app.redirpath
)
# Set network allowed ACLs
if app.mode == 'http' and app.network_allowed:
for network in app.network_allowed.split():
backends += templater.\
haproxy_http_backend_network_allowed_acl(app).\
format(network_allowed=network)
backends += templater.haproxy_http_backend_acl_allow_deny
elif app.mode == 'tcp' and app.network_allowed:
for network in app.network_allowed.split():
backends += templater.\
haproxy_tcp_backend_network_allowed_acl(app).\
format(network_allowed=network)
backends += templater.haproxy_tcp_backend_acl_allow_deny
if app.sticky:
logger.debug("turning on sticky sessions")
backends += templater.haproxy_backend_sticky_options(app)
frontend_backend_glue = templater.haproxy_frontend_backend_glue(app)
frontends += frontend_backend_glue.format(backend=backend)
do_backend_healthcheck_options_once = True
key_func = attrgetter('host', 'port')
taken_server_ids = set()
for backend_service_idx, backendServer\
in enumerate(sorted(app.backends, key=key_func)):
if do_backend_healthcheck_options_once:
if app.healthCheck:
template_backend_health_check = None
if app.mode == 'tcp' \
or app.healthCheck['protocol'] == 'TCP' \
or app.healthCheck['protocol'] == 'MESOS_TCP':
template_backend_health_check = templater \
.haproxy_backend_tcp_healthcheck_options(app)
elif app.mode == 'http':
template_backend_health_check = templater \
.haproxy_backend_http_healthcheck_options(app)
if template_backend_health_check:
health_check_port = get_backend_port(
apps,
app,
backend_service_idx)
backends += _get_health_check_options(
template_backend_health_check,
app.healthCheck,
health_check_port)
do_backend_healthcheck_options_once = False
logger.debug(
"backend server %s:%d on %s",
backendServer.ip,
backendServer.port,
backendServer.host)
# Create a unique, friendly name for the backend server. We concat
# the host, task IP and task port together. If the host and task
# IP are actually the same then omit one for clarity.
if backendServer.host != backendServer.ip:
serverName = re.sub(
r'[^a-zA-Z0-9\-]', '_',
(backendServer.host + '_' +
backendServer.ip + '_' +
str(backendServer.port)))
else:
serverName = re.sub(
r'[^a-zA-Z0-9\-]', '_',
(backendServer.ip + '_' +
str(backendServer.port)))
shortHashedServerName = hashlib.sha1(serverName.encode()) \
.hexdigest()[:10]
# In order to keep the state of backend servers consistent between
# reloads, server IDs need to be stable. See
# calculate_backend_id()'s docstring to learn how it is achieved.
server_id = calculate_server_id(serverName, taken_server_ids)
server_health_check_options = None
if app.healthCheck:
template_server_healthcheck_options = None
if app.mode == 'tcp' \
or app.healthCheck['protocol'] == 'TCP' \
or app.healthCheck['protocol'] == 'MESOS_TCP':
template_server_healthcheck_options = templater \
.haproxy_backend_server_tcp_healthcheck_options(app)
elif app.mode == 'http':
template_server_healthcheck_options = templater \
.haproxy_backend_server_http_healthcheck_options(app)
if template_server_healthcheck_options:
if app.healthcheck_port_index is not None:
health_check_port = \
get_backend_port(apps, app, backend_service_idx)
else:
health_check_port = app.healthCheck.get('port')
server_health_check_options = _get_health_check_options(
template_server_healthcheck_options,
app.healthCheck,
health_check_port)
backend_server_options = templater \
.haproxy_backend_server_options(app)
backends += backend_server_options.format(
host=backendServer.host,
host_ipv4=backendServer.ip,
port=backendServer.port,
serverName=serverName,
serverId=server_id,
cookieOptions=' check cookie ' + shortHashedServerName
if app.sticky else '',
healthCheckOptions=server_health_check_options
if server_health_check_options else '',
otherOptions=' disabled' if backendServer.draining else ''
)
http_frontend_list.sort(key=lambda x: x[0], reverse=True)
https_frontend_list.sort(key=lambda x: x[0], reverse=True)
for backend in http_frontend_list:
http_frontends += backend[1]
if group_https_by_vhosts:
for backend in sorted(https_grouped_frontend_list.keys()):
https_frontends +=\
templater.haproxy_https_grouped_vhost_frontend_acl.format(
backend=re.sub(r'[^a-zA-Z0-9\-]', '_', backend),
host=backend)
else:
for backend in https_frontend_list:
https_frontends += backend[1]
config += userlists
if bind_http_https:
config += http_frontends
config += http_appid_frontends
if bind_http_https:
config += https_frontends
if group_https_by_vhosts:
for vhost in sorted(https_grouped_frontend_list.keys()):
config +=\
templater\
.haproxy_https_grouped_vhost_backend_head\
.format(
name=re.sub(r'[^a-zA-Z0-9\-]', '_', vhost))
frontend = templater \
.haproxy_https_grouped_vhost_frontend_head \
.format(name=re.sub(r'[^a-zA-Z0-9\-]', '_', vhost),
sslCerts=" ".join(
map(lambda cert: "crt " + cert,
defaultValue(
https_grouped_frontend_list[vhost][1],
set(_ssl_certs)))),
bindOpts=" ".join(
map(lambda opts: " " + opts,
https_grouped_frontend_list[vhost][2]))
)
for v in sorted(
https_grouped_frontend_list[vhost][0],
key=lambda x: x[0],
reverse=True):
frontend += v[1]
config += frontend
config += frontends
config += backends
return config
def defaultValue(col, default):
if len(col) == 0:
return default
else:
return col
def get_haproxy_pids():
try:
return set(map(lambda i: int(i), subprocess.check_output(
"pidof haproxy",
stderr=subprocess.STDOUT,
shell=True).split()))
except subprocess.CalledProcessError as ex:
logger.debug("Unable to get haproxy pids: %s", ex)
return set()
def reloadConfig():
reloadCommand = []
if args.command:
reloadCommand = shlex.split(args.command)
else:
logger.debug("No reload command provided, trying to find out how to" +
" reload the configuration")
if os.path.isfile('/etc/init/haproxy.conf'):
logger.debug("we seem to be running on an Upstart based system")
reloadCommand = ['reload', 'haproxy']
elif (os.path.isfile('/usr/lib/systemd/system/haproxy.service') or
os.path.isfile('/lib/systemd/system/haproxy.service') or
os.path.isfile('/etc/systemd/system/haproxy.service')):
logger.debug("we seem to be running on systemd based system")
reloadCommand = ['systemctl', 'reload', 'haproxy']
elif os.path.isfile('/etc/init.d/haproxy'):
logger.debug("we seem to be running on a sysvinit based system")
reloadCommand = ['/etc/init.d/haproxy', 'reload']
else:
# if no haproxy exists (maybe running in a container)
logger.debug("no haproxy detected. won't reload.")
reloadCommand = None
if reloadCommand:
logger.info("reloading using %s", " ".join(reloadCommand))
try:
start_time = time.time()
checkpoint_time = start_time
# Retry or log the reload every 10 seconds
reload_frequency = args.reload_interval
reload_retries = args.max_reload_retries
enable_retries = True
infinite_retries = False
if reload_retries == 0:
enable_retries = False
elif reload_retries < 0:
infinite_retries = True
old_pids = get_haproxy_pids()
subprocess.check_call(reloadCommand, close_fds=True)
new_pids = get_haproxy_pids()
logger.debug("Waiting for new haproxy pid (old pids: [%s], " +
"new_pids: [%s])...", old_pids, new_pids)
# Wait until the reload actually occurs and there's a new PID
while True:
if len(new_pids - old_pids) >= 1:
logger.debug("new pids: [%s]", new_pids)
logger.debug("reload finished, took %s seconds",
time.time() - start_time)
break
timeSinceCheckpoint = time.time() - checkpoint_time
if (timeSinceCheckpoint >= reload_frequency):
logger.debug("Still waiting for new haproxy pid after " +
"%s seconds (old pids: [%s], " +
"new_pids: [%s]).",
time.time() - start_time, old_pids, new_pids)
checkpoint_time = time.time()
if enable_retries:
if not infinite_retries:
reload_retries -= 1
if reload_retries == 0:
logger.debug("reload failed after %s seconds",
time.time() - start_time)
break
logger.debug("Attempting reload again...")
subprocess.check_call(reloadCommand, close_fds=True)
time.sleep(0.1)
new_pids = get_haproxy_pids()
except OSError as ex:
logger.error("unable to reload config using command %s",
" ".join(reloadCommand))
logger.error("OSError: %s", ex)
except subprocess.CalledProcessError as ex:
logger.error("unable to reload config using command %s",
" ".join(reloadCommand))
logger.error("reload returned non-zero: %s", ex)
def generateHttpVhostAcl(
templater, app, backend, haproxy_map, map_array,
haproxy_dir, duplicate_map):
# If the hostname contains the delimiter ',', then the marathon app is
# requesting multiple hostname matches for the same backend, and we need
# to use alternate templates from the default one-acl/one-use_backend.
staging_http_frontends = ""
staging_https_frontends = ""
https_grouped_frontend_list = defaultdict(lambda: ([], set(), set()))
if "," in app.hostname:
logger.debug(
"vhost label specifies multiple hosts: %s", app.hostname)
vhosts = app.hostname.split(',')
acl_name = re.sub(r'[^a-zA-Z0-9\-]', '_', vhosts[0]) + \
'_' + app.appId[1:].replace('/', '_')
if app.path:
if app.authRealm:
# Set the path ACL if it exists
logger.debug("adding path acl, path=%s", app.path)
http_frontend_acl = \
templater.\
haproxy_http_frontend_acl_only_with_path_and_auth(app)
staging_http_frontends += http_frontend_acl.format(
path=app.path,
cleanedUpHostname=acl_name,
hostname=vhosts[0],
realm=app.authRealm,
backend=backend
)
https_frontend_acl = \
templater.\
haproxy_https_frontend_acl_only_with_path(app)
staging_https_frontends += https_frontend_acl.format(
path=app.path,
cleanedUpHostname=acl_name,
hostname=vhosts[0],
realm=app.authRealm,
backend=backend
)
else:
# Set the path ACL if it exists
logger.debug("adding path acl, path=%s", app.path)
http_frontend_acl = \
templater.haproxy_http_frontend_acl_only_with_path(app)
staging_http_frontends += http_frontend_acl.format(
path=app.path,
backend=backend
)
https_frontend_acl = \
templater.haproxy_https_frontend_acl_only_with_path(app)
staging_https_frontends += https_frontend_acl.format(
path=app.path,
backend=backend
)
temp_frontend_head = staging_https_frontends
for vhost_hostname in vhosts:
https_grouped_frontend_list[vhost_hostname][0].append(
(app.backend_weight, temp_frontend_head))
if app.sslCert is not None:
https_grouped_frontend_list[vhost_hostname][1].add(app.sslCert)
if app.bindOptions is not None:
https_grouped_frontend_list[vhost_hostname][2].add(
app.bindOptions)
logger.debug("processing vhost %s", vhost_hostname)
if haproxy_map and not app.path and not app.authRealm and \
not app.redirectHttpToHttps:
if 'map_http_frontend_acl' not in duplicate_map:
app.backend_weight = -1
http_frontend_acl = templater.\
haproxy_map_http_frontend_acl_only(app)
staging_http_frontends += http_frontend_acl.format(
haproxy_dir=haproxy_dir
)
duplicate_map['map_http_frontend_acl'] = 1
map_element = {}
map_element[vhost_hostname] = backend
if map_element not in map_array:
map_array.append(map_element)
else:
http_frontend_acl = templater.\
haproxy_http_frontend_acl_only(app)
staging_http_frontends += http_frontend_acl.format(
cleanedUpHostname=acl_name,
hostname=vhost_hostname
)
# Tack on the SSL ACL as well
if app.path:
if app.authRealm:
https_frontend_acl = templater.\
haproxy_https_frontend_acl_with_auth_and_path(app)
staging_https_frontend = https_frontend_acl.format(
cleanedUpHostname=acl_name,
hostname=vhost_hostname,
appId=app.appId,
realm=app.authRealm,
backend=backend
)