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#!/usr/bin/env bash
########################################################################
### Start asynchronous clients that can
### wait for asynchronous server to start
########################################################################
### Usage: ./arun.sh [client#]
### - client# => do not start server until just before this client
### Socket file; client count
ADDR=ipc:///tmp/async_demo
COUNT=10
### Client # to match when server should be started; clear server PID
SERVER_ORDINAL=$1
unset SERVER_PID
### Create CLIENT_PID as an array
typeset -a CLIENT_PID
i=0
while (( i < COUNT ))
do
i=$(( i + 1 ))
### Start server before the matching client
if [ "$SERVER_ORDINAL" == "$i" ] ; then
./server $ADDR &
SERVER_PID=$!
echo Started server before client $i
trap "kill $SERVER_PID" 0
fi
### Start start client with NONBLOCK envvar set
### so client will wait for socket to be open on nng_dial
rnd=$(( RANDOM % 1000 + 500 ))
echo "Starting client $i: server will reply after $rnd msec"
NONBLOCK= ./client $ADDR $rnd &
### Add this client's PID to client PID array
eval CLIENT_PID[$i]=$!
done
### Start server if not yet started
[ "$SERVER_PID" ] || \
{
./server $ADDR &
SERVER_PID=$!
echo Starting server after last client - SERVER_PID=$SERVER_PID
trap "kill $SERVER_PID" 0
}
### Wait for clients to complete
i=0
while (( i < COUNT ))
do
i=$(( i + 1 ))
wait ${CLIENT_PID[$i]}
done
### Kill server
kill $SERVER_PID
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