Sha256: 6f293970b7b180b6c220a06f7352743788972367a60672241c1343f3fc28ba26
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Size: 1.96 KB
Versions: 89
Compression:
Stored size: 1.96 KB
Contents
module Consul
module Async
class ProcessDoesNotExist < StandardError
end
class ProcessHandler
attr_reader :command, :sig_reload, :sig_term, :pid, :exit_status
def initialize(command, sig_reload: 'HUP', sig_term: 'TERM')
raise 'empty sig_term is not supported' unless sig_term
@command = command
@sig_reload = sig_reload
@sig_term = sig_term
@pid = nil
@exit_status = nil
end
def start
return pid unless pid.nil?
@pid = Process.spawn(command)
end
def reload
return if sig_reload.nil?
STDERR.puts "Sending SIG #{sig_reload} to #{pid}..."
begin
Process.kill(sig_reload, pid)
rescue Errno::ESRCH => e
STDERR.puts "*** Process #{pid} has already been killed: #{e.inspect}"
raise e
end
end
def kill
return exit_status if pid.nil?
the_pid = pid
@pid = nil
STDERR.puts "[KILL] Sending SIG #{sig_term} to #{the_pid}..."
begin
STDERR.puts "[KILL] waiting for #{the_pid}..."
Process.kill(sig_term, the_pid)
rescue Errno::ESRCH
STDERR.puts "[KILL] *** Process #{the_pid} has already been killed"
end
begin
_pid, @exit_status = Process.waitpid2 the_pid
rescue SystemCallError
STDERR.puts "[KILL] *** UNEXPECTED ERROR *** Failed to get return code for #{the_pid}"
end
exit_status
end
def process_status
raise ProcessDoesNotExist, 'No child process' if pid.nil?
begin
cpid, result = Process.waitpid2(pid, Process::WNOHANG)
raise ProcessDoesNotExist, "Unexpected PID: #{cpid}, was expecting #{pid}" unless cpid.nil? || cpid == pid
result
rescue Errno::ECHILD => e
e2 = ProcessDoesNotExist.new e
raise e2, "ChildProcess has been killed: #{e.message}", e.backtrace
end
end
end
end
end
Version data entries
89 entries across 89 versions & 1 rubygems