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module God
module Conditions
# Trigger when a process is running or not running depending on attributes.
#
# Examples
#
# # Trigger if process IS NOT running.
# on.condition(:process_running) do |c|
# c.running = false
# end
#
# # Trigger if process IS running.
# on.condition(:process_running) do |c|
# c.running = true
# end
#
# # Non-Watch Tasks must specify a PID file.
# on.condition(:process_running) do |c|
# c.running = false
# c.pid_file = "/var/run/mongrel.3000.pid"
# end
class ProcessRunning < PollCondition
# Public: The Boolean specifying whether you want to trigger if the
# process is running (true) or if it is not running (false).
attr_accessor :running
# Public: The String PID file location of the process in question.
# Automatically populated for Watches.
attr_accessor :pid_file
def pid
self.pid_file ? File.read(self.pid_file).strip.to_i : self.watch.pid
end
def valid?
valid = true
valid &= complain("Attribute 'pid_file' must be specified", self) if self.pid_file.nil? && self.watch.pid_file.nil?
valid &= complain("Attribute 'running' must be specified", self) if self.running.nil?
valid
end
def test
self.info = []
pid = self.pid
active = pid && System::Process.new(pid).exists?
if (self.running && active)
self.info.concat(["process is running"])
true
elsif (!self.running && !active)
self.info.concat(["process is not running"])
true
else
if self.running
self.info.concat(["process is not running"])
end
false
end
end
end
end
end
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