shell脚本使用 timeout + wait 完成: 超时退出执行，等待执行完毕并处理执行结果 - yanbin's Blog

shell脚本使用 timeout + wait 完成: 超时退出执行，等待执行完毕并处理执行结果

yanbin posted @ 2015年6月28日 17:52 in Programming with tags linux shell programming , 20989 阅读
具体需求是：
1.从文件中读取 seq, 使用 pub 程序将 seq 推送给定阅读了 cmd topic 的 peer client.
   client 将处理结果(message)推送到 cmdresp topic. 这个过程是经过 server 的，可以不考虑。
   pub 成功后记录 seq.
2. sub 程序订阅 cmdresp topic, 简单处理接收到的消息，并且记录到文件。
3. 对比 pub 成功的 seq 记录与接收到的 message, 获得一个 pub/sub 成功率。
 
问题是：
1. pub 和 sub 分别使用两个不同的管道，pub cmd 成功后并不等待 cmdresp.
   甚至可以说: pub 程序并不知道 cmdresp 的存在，甚至不知道 sub 的存在.
2. sub 是阻塞的：没有任何消息也不退出。
3. pub message 到 peer client 到 cmdresp 返回之间的时间是不确定的。
   消息在两个管道都有可能出现延迟。
4. sub 程序本身没有超时退出选项。
 
伪代码是：
timeout time sub cmdresp_topic > cmdresp_record
while seq in read seqs:
     seq = parse_seq(seq)
     message = create_message(seq)
     pub cmd_topic message
     record(message, msg_record)
     // do something, maybe sleep 1s

wait sub

parse(cmdresp_record, msg_record)

shell 代码是：
 

tmp_file="$(mktemp)
rm -f $tmp_file
mkfifo $tmp_file

# terminate $MOSQUITTO while $TIMEOUT period
timeout $TIMEOUT \
$MOSQUITTO_SUB -t $topic_resp --cafile $CA --cert $CERT --key $KEY > $tmp_file &
cat $tmp_file | cut -d',' -f1 | cut -d':' -f2 | sed -n 's/\"//gp' >> $SUB_LOG &

N=0
for line in $(cat $SNS_FILE)
do
sn="$(echo "$line" | cut -d'&' -f1)"
seq="$($LOOKUP_TOPIC $sn)"
name="$(printf "%s%.4d" $sn $seq)"
topic="router/$name/cmd"

N=$((N+1))
mid="$(date +%Y%m%d%H%M%S)-$N"
message=makemsg $mid

$MOSQUITTO_PUB -t $topic --cafile $CA --cert $CERT --key $KEY -m "$message"
sw="$(echo "$line" | cut -d'&' -f2)"
record="$(date +%Y%m%d:%H),$sn,$sw,1"
[ $? -eq 0 ] && echo "$record" >> $PUB_LOG
[ $((N % 10)) -eq 0 ] && sleep $SLEEP_TIME
done

wait # wait $MOSQUITTO_SUB and cat $tmpfile terminaation
rm -f $tmp_file
if [ -f $SUB_LOG -a -f $PUB_LOG ]; then
tmp_file="$(mktemp -p $RECORD_DIR)"
for line in $(cat $SUB_LOG)
do
sed "s/\(.*$line.*\),1/\1,0/g" $PUB_LOG > $tmp_file
cp $tmp_file $PUB_LOG
done
rm -f $tmp_file
fi

 

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