# This file is part of bish-bosh. It is subject to the licence terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/raphaelcohn/bish-bosh/master/COPYRIGHT. No part of bish-bosh, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
# Copyright © 2014-2015 The developers of bish-bosh. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/raphaelcohn/bish-bosh/master/COPYRIGHT.


core_dependency_requires '*' kill
bishbosh_connection_foreground_initialise()
{
	# http://mywiki.wooledge.org/SignalTrap
	bishbosh_connection_foreground_monitorForChildExit=0
	trap '' INT HUP TERM ABRT QUIT
	trap _bishbosh_connection_foreground_trapHandlerMost HUP TERM ABRT QUIT
	trap _bishbosh_connection_foreground_trapHandlerINT INT
}

_bishbosh_connection_foreground_trapHandlerMost()
{
	bishbosh_connection_foreground_monitorForChildExit=1
	
	trap - INT HUP TERM ABRT QUIT
}

_bishbosh_connection_foreground_trapHandlerINT()
{
	bishbosh_connection_foreground_monitorForChildExit=2
	
	trap - INT HUP TERM ABRT QUIT
}

core_usesIn core variable
bishbosh_connection_foreground_recordBackgroundJob()
{
	local pidName="$1"
	local pid=$!
	
	core_variable_setVariable "$pidName" $pid
	core_children_killOnExit $pid
	core_message DEBUG "$pidName is $pid"
}

bishbosh_connection_foreground_monitorForChildExit()
{
	core_message DEBUG "Our Pid is $$"
	core_message NOTICE "Terminate ${_program_name} with $(core_terminal_effect 2 reversed) kill $$ "
	
	while true
	do
		# Can be changed by signal handler
		if [ $bishbosh_connection_foreground_monitorForChildExit -gt 0 ]; then
			
			kill $bishbosh_connection_processLoopPid 2>/dev/null || true
			set +e
			wait $bishbosh_connection_processLoopPid
			local exitCode=$?
			set -e
			
			# http://mywiki.wooledge.org/SignalTrap
			if [ $bishbosh_connection_foreground_monitorForChildExit -eq 2 ]; then
				kill -INT $$ 2>/dev/null || true
				exit 1
			else
				if [ $exitCode -ne 0 ]; then
					core_exitError $exitCode "terminated by TERM, HUP, ABRT or QUIT"
				else
					exit 0
				fi
			fi
		fi
	
		# The processLoop has exited. If it exited non-cleanly (ie before DISCONNECT was fully piped), bishbosh_client_* runs forever (no EOF) 
		if ! kill -0 $bishbosh_connection_processLoopPid 2>/dev/null; then
			set +e
			wait $bishbosh_connection_processLoopPid
			local exitCode=$?
			set -e
			if [ $exitCode -ne 0 ]; then
				core_exitError $exitCode "processLoop failed"
			fi
			exit 0
		fi
		
		# core_exitError $core_commandLine_exitCode_TEMPFAIL "Could not connect"
		# bishbosh_client_* is dead, either because the connection wasn't established (so exitCode is usually 1), or the processLoop cleanly exited
		# Seems if server closes connection, exit code is 0 for nc.
		if [ $bishbosh_connection_clientPid -ne -1 ]; then
			if ! kill -0 $bishbosh_connection_clientPid 2>/dev/null; then
				set +e
				wait $bishbosh_connection_clientPid
				local exitCode=$?
				set -e
				if [ $exitCode -ne 0 ]; then
					core_exitError $core_commandLine_exitCode_TEMPFAIL "Could not connect to '$bishbosh_server'"
				fi
				exit 0
			fi
		fi
		
		sleep "$bishbosh_readLatency_inFractionalSeconds"
	done
}