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#!/usr/bin/python
#
# Copyright 2014 Canonical Ltd. All rights reserved
# Author: Chris Stratford <chris.stratford@canonical.com>
import sys
import os
import os.path
import subprocess
import json
import base64
import shutil
import collections
import socket
sys.path.insert(0, os.path.join(os.environ['CHARM_DIR'], 'lib'))
from charmhelpers.core.hookenv import (
Hooks, log, charm_dir, relations_of_type
)
from charmhelpers.core import host, hookenv
from charmhelpers.core.host import mkdir, service_start, service_stop, service_restart
from charmhelpers.core.services import RelationContext
from charmhelpers.fetch import apt_install, apt_update, add_source
from Cheetah.Template import Template
from Config import Config
#from nrpe import update_nrpe_checks
from charmhelpers.contrib.charmsupport import nrpe
hooks = Hooks()
conf = Config()
def jujuHeader():
header = ("#-------------------------------------------------#\n"
"# This file is Juju managed - do not edit by hand #\n"
"#-------------------------------------------------#\n")
return header
def installPackages():
if conf.packageName():
pkgFile = os.path.join(charm_dir(), "files", conf.packageName())
if os.path.exists(pkgFile):
if subprocess.call(["dpkg", "-i", pkgFile]) != 0:
log("CHARM: Error installing logstash-forwarder package")
sys.exit(1)
else:
if conf.aptRepository() and conf.aptRepository_key():
add_source(conf.aptRepository(), conf.aptRepositoryKey())
apt_update()
apt_install(conf.packageName(), options=['--force-yes'])
def replaceInitScript():
src = os.path.join(charm_dir(), "files", "init.sh")
dest = "/etc/init.d/logstash-forwarder"
shutil.copyfile(src, dest)
os.chmod(dest, 0755)
def writeEtcDefault():
tmplData = {}
tmplData["config_file"] = conf.configFile()
tmplData["spool_size"] = conf.spoolSize()
templateFile = os.path.join(charm_dir(), "templates", "etcdefault.tmpl")
t = Template(file=templateFile, searchList=tmplData)
with open("/etc/default/logstash-forwarder", "w") as f:
os.chmod("/etc/default/logstash-forwarder", 0644)
f.write(jujuHeader())
f.write(str(t))
def writeLogrotate():
src = os.path.join(charm_dir(), "files", "logstash-forwarder.logrotate")
dest = "/etc/logrotate.d/logstash-forwarder"
shutil.copyfile(src, dest)
os.chmod(dest, 0755)
def writeSSL():
if not os.path.exists(conf.configDir()):
mkdir(conf.configDir())
if conf.sslCert():
with open(conf.sslCertFile(), "w") as f:
os.chmod(conf.sslCertFile(), 0644)
f.write(base64.b64decode(conf.sslCert()))
if conf.sslKey():
with open(conf.sslKeyFile(), "w") as f:
os.chmod(conf.sslKeyFile(), 0600)
f.write(base64.b64decode(conf.sslKey()))
if conf.sslCACert():
with open(conf.sslCACertFile(), "w") as f:
os.chmod(conf.sslCACertFile(), 0644)
f.write(base64.b64decode(conf.sslCACert()))
def writeConfig():
config = {}
servers = []
files = []
logs_relation_data = logs_relation()
if not os.path.exists(conf.configDir()):
mkdir(conf.configDir())
serverPort = conf.serverPort()
for server in conf.servers():
servers.append(server + ":" + str(serverPort))
config["network"] = {}
config["network"]["servers"] = servers
if conf.sslCert():
config["network"]["ssl certificate"] = conf.sslCertFile()
if conf.sslKey():
config["network"]["ssl key"] = conf.sslKeyFile()
if conf.sslCACert():
config["network"]["ssl ca"] = conf.sslCACertFile()
if conf.timeout():
config["network"]["timeout"] = conf.timeout()
config["files"] = []
fileSpec = conf.files()
if fileSpec is not None:
if isinstance(fileSpec, list):
# The files option is a list of hashes, as per the definition
# of the files attribute of the logstash-forwarder config at:
# https://github.com/elastic/logstash-forwarder
config["files"] = fileSpec
else:
for logType in fileSpec:
files.append({
"paths": fileSpec[logType],
"fields": {"type": logType}
})
config["files"] = files
default_fields = {'hostname': socket.gethostname()}
model = os.environ.get('JUJU_MODEL_NAME', os.environ.get('JUJU_ENV_NAME'))
if model:
default_fields['juju_model'] = model
unit = None
logs = hookenv.relations_of_type('logs')
if logs:
unit = logs[0]['__unit__']
else:
juju_info = hookenv.relations_of_type('juju-info')
if juju_info:
unit = juju_info[0]['__unit__']
if unit:
default_fields['juju_unit'] = unit.replace('/', '-')
default_fields['juju_service'] = unit.split('/')[0]
for file in config["files"]:
for default, value in default_fields.items():
file["fields"].setdefault(default, value)
if logs_relation_data is not None:
for path, rel_fields in logs_relation_data.items():
fields = default_fields.copy()
fields.update(rel_fields)
config["files"].append({"paths": [path], "fields": fields})
host.write_file(
conf.configFile(), json.dumps(config, sort_keys=True, indent=4))
def writeEtcHosts():
log("CHARM: updating /etc/hosts with logstash servers name mapping")
name_map = conf.serversNameMap()
servers = conf.servers()
if not name_map:
return
new_hosts = []
for server in servers:
ipaddr = name_map[server]
new_hosts.append('{} {}'.format(ipaddr.strip(), server.strip()))
# update /etc/hosts
with open('/etc/hosts') as f:
current_hosts = f.readlines()
section_start = "### logstash-forwarder start ###\n"
section_end = "### logstash-forwarder end ###\n"
with open('/tmp/new_hosts', 'w') as f:
ignore_lines = False
for host_line in current_hosts:
if host_line == section_start:
ignore_lines = True
elif host_line == section_end:
ignore_lines = False
elif not ignore_lines:
f.write(host_line)
# now write a new section for our hosts
f.write("### logstash-forwarder start ###\n")
for new_host_line in new_hosts:
f.write("{}\n".format(new_host_line))
f.write("### logstash-forwarder end ###\n")
os.rename('/tmp/new_hosts', '/etc/hosts')
@hooks.hook('nrpe-external-master-relation-changed')
def update_nrpe_checks():
rels = relations_of_type('nrpe-external-master')
if not rels:
log("No nrpe-external-master relations found, skipping update_nrpe_checks")
return
if 'nagios_hostname' not in rels[0]:
log("No nagios_hostname in nrpe-external-master relations found, "
"skipping update_nrpe_checks")
return
# only use the first relation in the list...we should have a single nrpe
nrpe_compat = nrpe.NRPE(hostname=rels[0]['nagios_hostname'])
conf = nrpe_compat.config
check_procs_params = conf.get('nagios_check_procs_params')
if check_procs_params:
nrpe_compat.add_check(
shortname='logstashforwarder_process',
description='Check logstash-forwarder process running',
check_cmd='check_procs %s' % check_procs_params
)
nrpe_compat.add_check(
shortname='logstashforwarder_sending',
description='Check logstash-forwarder is sending by tailing logfile',
check_cmd="/usr/local/lib/nagios/plugins/check-logstashforwarder-sending.sh"
)
nrpe_compat.write()
copy_check_files()
def copy_check_files():
script_dir = "/usr/local/lib/nagios/plugins"
mkdir(script_dir)
for script in ["check-logstashforwarder-sending.sh"]:
src = os.path.join(charm_dir(), "files", script)
dest = os.path.join(script_dir, script)
shutil.copyfile(src, dest)
os.chmod(dest, 0755)
@hooks.hook("install.real")
def install():
log("CHARM: Installing {}".format(conf.appName()))
installPackages()
replaceInitScript()
writeLogrotate()
@hooks.hook("upgrade-charm")
def upgrade_charm():
log("CHARM: Upgrading {}".format(conf.appName()))
writeLogrotate()
@hooks.hook("config-changed")
def config_changed():
log("CHARM: Configuring {}".format(conf.appName()))
installPackages()
replaceInitScript()
writeEtcDefault()
writeSSL()
writeEtcHosts()
writeConfig()
service_restart("logstash-forwarder")
update_nrpe_checks()
@hooks.hook("start")
def start():
log("CHARM: Starting {}".format(conf.appName()))
service_start("logstash-forwarder")
@hooks.hook("stop")
def stop():
log("CHARM: Stopping {}".format(conf.appName()))
service_stop("logstash-forwarder")
@hooks.hook("logs-relation-joined")
@hooks.hook('logs-relation-changed')
@hooks.hook('logs-relation-departed')
@hooks.hook('logs-relation-broken')
@hooks.hook("juju-info-relation-joined")
@hooks.hook("juju-info-relation-departed")
def logs_relation_hooks():
log('logs relation')
writeConfig()
service_restart("logstash-forwarder")
def logs_relation():
lsr = LogsRelation()
log("LogsRelation: {}".format(lsr))
if 'logs' not in lsr:
return
logs_relation_data = lsr['logs']
if (not logs_relation_data or
'types' not in logs_relation_data[0] or
'files' not in logs_relation_data[0]):
return None
reldata = {k: v.split() for k, v in logs_relation_data[0].items()}
reldata.pop('private-address', None)
reldata.pop('public-address', None)
paths = reldata.pop('files')
types = reldata.pop('types')
config = collections.OrderedDict()
for i, (path, type_) in enumerate(zip(paths, types)):
fields = {k: v[i] for k, v in reldata.items()
if i < len(v) and v[i] != 'SKIP'}
fields['type'] = type_
config[path] = fields
return config
class LogsRelation(RelationContext):
name = 'logs'
interface = 'logs'
required_keys = ['types', 'files']
if __name__ == "__main__":
hooks.execute(sys.argv)
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