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|
#!/usr/bin/env ruby
#
# watchdog.rb: Watchdog component.
#
# Copyright (C) 2011 VMware, 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.
require 'thread'
require 'ffi-rzmq'
require 'socket'
trap("INT") { exit }
trap("TERM") { exit }
def raise_if_error(rc)
unless ZMQ::Util.resultcode_ok?(rc)
raise "ZMQ Error: #{ZMQ::Util.error_string}"
end
end
if ARGV.length != 1
print "usage: watchdog <notifier-host>\n"
exit 1
end
notifier_ep = "tcp://#{ARGV[0]}:7770"
control_ep = "tcp://*:7772"
ctx = ZMQ::Context.new()
notifier_sock = ctx.socket(ZMQ::PUB)
rc = notifier_sock.connect(notifier_ep)
raise_if_error(rc)
control_sock = ctx.socket(ZMQ::PULL)
rc = control_sock.bind(control_ep)
raise_if_error(rc)
poller = ZMQ::Poller.new
poller.register_readable(control_sock)
children = {}
# Delete process if it went away
trap("CHLD") do
pid = Process.wait
children.each do |k, v|
if v[:pid] == pid
children.delete(k)
end
end
end
# Kill any children on exit
trap("TERM") do
children.each do |k, v|
Process.kill("KILL", v[:pid])
end
end
#
# Main loop
#
loop do
ready = poller.poll(1)
# Process commands, if any.
if (ready == 1 && poller.readables.include?(control_sock))
msg = ''
rc = control_sock.recv_string(msg)
raise_if_error(rc)
if (msg =~ /^START (.+)$/)
command = $1
key = command.split()[0]
unless children.has_key?(key)
exec_command = "./" + key
if File.exists?(exec_command) && File.executable?(exec_command)
children[key] = {}
children[key][:pid] = Process.spawn("./" + command)
children[key][:command] = command
end
end
elsif (msg =~ /^STOP (.+)$/)
command = $1
key = command.split()[0]
if children.has_key?(key)
Process.kill("KILL", children[key][:pid])
while children.has_key?(key)
# nothing
end
end
end
# Otherwise, send out status messages to notifier.
else
status = "WATCHDOG ALIVE " + Socket.gethostname + " " + Time.now.to_f.to_s
rc = notifier_sock.send_string(status)
raise_if_error(rc)
children.each do |k, v|
status = "WATCHDOG RUNNING " + Socket.gethostname + \
" " + Time.now.to_f.to_s + " " + v[:command]
rc = notifier_sock.send_string(status)
raise_if_error(rc)
end
end
end
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