1

I'm used to catching SIGTERM and SIGINT on my node.js scripts. I use process.on('SIGTERM',function(){ <stuff> }); and I can call other functions that revert some changes before closing, or just print "you pressed ^C !", do nothing else and the script keeps running if I want to.

It doesn't work since I added web3. When I press ^C is pauses the script and I can't do anything. I have to kill the process by pid on another terminal.

The most blocking operation is accessing data from a contract loaded in the beginning of the script. Something like:

valueA = mycontract.mappingA(key);
valueB = mycontract.mappingB(key);

This operation takes about 250ms and is repeated a lot of times, so I'm almost sure the script is on that part when I press ^C.

I tried putting that part in a try/catch construct but it still won't do what is on the catch part.

Why is this happening ? Can I make it work or should I stop catching SIGINT and SIGTERM ?


If you need extra info, on my process list (ps aux), under node myscript.js there is a script called [nodejs] <defunct>. The "state" part indicates node myscript is Rl+ (Running or runnable, multi-threaded, on the foreground process group) and [nodejs] <defunct> is Z+ (defunct/zombie, on the foreground).

7
  • Do you have an event listener or filter in your code? That's always on until you .stopWatching(). Jan 18, 2017 at 16:41
  • I don't think so. I didn't use stopWatching() either. What is always on ? Jan 18, 2017 at 16:47
  • When you filter, web3 will regularly ping the RPC node for updates. It never gives back the hand so NodeJs never considers it finished. Jan 18, 2017 at 17:11
  • @XavierLeprêtreB9lab If I understand correctly, if I don't filter I shouldn't have this problem ? Could it be set automatically, as an option on geth for example ? Jan 18, 2017 at 17:19
  • Correct, you need to explicitly filter for it to happen. Jan 18, 2017 at 17:56

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.