I have accidentally delete source code of nodejs application, but this application is running, so how can I get source code back from running app?
I hope source code has been cached in some directory.
I was able to recover the full file by attaching the debugger (as TGrif suggested).
To actually recover the code:
Use setBreakpoint('app.js', 10), where 10 is a line of the code you know will be ran over again in the running process
Say pause, then next until it's paused on the script you want to recover.
Finally, say list(5000), where 5000 is an arbitrarily long number of lines to list.
You will now have your full script printed out, albeit with line numbers at the front, but you can use a site like this to remove them.
Hope this helps anyone who encounters this unique issue in the future, as this took me a couple hours to figure out.
There is maybe a way to retrieve some of your source code with the Nodejs debugger.
Assuming Linux OS, you need to get the process id of your application:
$ ps -e | grep node
Next you entering your app in debug mode with something like that:
$ kill -s USR1 PID
where PID is the pid of your node app.
Then your start the debug console:
$ node debug -p PID
If you have an app console, you'll see:
Starting debugger agent.
Debugger listening on port 5858
In your debug console you should see a debug prompt and you can get available commands with:
debug> help
I am able to show some of the running app source with the list command:
debug> list(NUMBER_OF_LINE)
where NUMBER_OF_LINE is the number of source code line you want to display.
I'm not sure this is a one shot try for you or not because my source code was not deleted.
Hope you can get some results.
Related
i wrote a little Server with node.js on our ibm i.
To start the server i have to run this command:
5250> qsh
$ node /home/node/server.js
How can i automate this or run the Server with a CL-Script and how can i stop the Server then ?
thanks jo
One very simple way is to do it in a CL Program like this:
ADDENVVAR ENVVAR(QIBM_MULTI_THREADED) VALUE(Y)
MONMSG MSGID(CPF0000)
QSH CMD('sh -c /myNodeDirectoryInIfs/myShellScript.sh')
Your shell Script may look like this then:
#!
cd /myNodeDirectoryInIfs/dist/build
node myNodeScript.js
To start it, you can do a SBMJOB on the above CL Program.
To End it, you need to end the submitted Job.
A better way of course is to use a Process Manager like pm2 for example.
If you are still interessted in doing that, please leave a comment.
I am working with Ubuntu 16.04 and I have two shell scripts:
run_roscore.sh : This one fires up a roscore in one terminal.
run_detection_node.sh : This one starts an object detection node in another terminal and should start up once run_roscore.sh has initialized the roscore.
I need both the scripts to execute as soon as the system boots up.
I made both scripts executable and then added the following command to cron:
#reboot /path/to/run_roscore.sh; /path/to/run_detection_node.sh, but it is not running.
I have also tried adding both scripts to the Startup Applications using this command for roscore: sh /path/to/run_roscore.sh and following command for detection node: sh /path/to/run_detection_node.sh. And it still does not work.
How do I get these scripts to run?
EDIT: I used the following command to see the system log for the CRON process: grep CRON /var/log/syslog and got the following output:
CRON[570]: (CRON) info (No MTA installed, discarding output).
So I installed MTA and then systemlog shows:
CRON[597]: (nvidia) CMD (/path/to/run_roscore.sh; /path/to/run_detection_node.sh)
I am still not able to see the output (which is supposed to be a camera stream with detections, as I see it when I run the scripts directly in a terminal). How should I proceed?
Since I got this working eventually, I am gonna answer my own question here.
I did the following steps to get the script running from startup:
Changed the type of the script from shell to bash (extension .bash).
Changed the shebang statement to be #!/bin/bash.
In Startup Applications, give the command bash path/to/script to run the script.
Basically when I changed the shell type from sh to bash, the script starts running as soon as the system boots up.
Note, in case this helps someone: My intention to have run_roscore.bash as a separate script was to run roscore as a background process. One can run it directly from a single script (which is also running the detection node) by having roscore& as a command before the rosnode starts. This command will fire up the master as a background process and leave the same terminal open for following commands to be executed.
If you could install immortal you could use the require option to start in sequence your services, for example, this is could be the run config for /etc/immortal/script1.yml:
cmd: /path/to/script1
log:
file: /var/log/script1.log
wait: 1
require:
- script2
And for /etc/immortal/script2.yml
cmd: /path/to/script2
log:
file: /var/log/script2.log
What this will do it will try to start both scripts on boot time, the first one script1 will wait 1 second before starting and also wait for script2 to be up and running, see more about the wait and require option here: https://immortal.run/post/immortal/
Based on your operating system you will need to configure/setup immortaldir, her is how to do it for Linux: https://immortal.run/post/how-to-install/
Going more deep in the topic of supervisors there are more alternatives here you could find some: https://en.wikipedia.org/wiki/Process_supervision
If you want to make sure that "Roscore" (whatever it is) gets started when your Ubuntu starts up then you should start it as a service (not via cron).
See this question/answer.
I am working on a BBB device running on an Angstrom image and the display panel is a 7 inch LCD cape. I want to start an application as soon as log-in message prompts means the application should get start automatically just after the booting. To achieve this I tried
1) To put my script files in /etc/init.d and linked the script with /etc/rc5.d as S99myscript and then updated the rc.d
But it was not an successful attempt.
2) I changed the /etc/issue file a little bit and to invoke the script i appended myscript file in the last as this.
. /home/root/myscript
// tried it like this also
sh . /home/root/myscript
but this time also i couldn't get my desired result.
What's i am missing ? Or how can I get the result.
The service file
Status of service file
I installed the Freeswitch on Ubuntu Image in the Docker, referring to the documentation mentioned here.
When I did the following:
Start FreeSWITCH
First Time
cd /usr/local/freeswitch/bin
./freeswitch
I got to the following screen on my command prompt.
And as the last line says, [WARNING] switch_console.c:1053 We've become an orphan, no more console for us., something is wrong here I believe.
As per the documentation, I was expecting the prompt, like freeswitch#domain> .
Does anyone know what could be the problem? Upon researching this error I landed at the source file many times at different places, for example, one mentioned here
I had the same problem.
If we look in the source code of Freeswitch, we see
if (getppid() == 1) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "We've become an orphan, no more console for us.\n");
break;
}
We see that we had pid == 1, this mean that parent process for freeswitch is init process but we launched it in bash
docker run -it freeswitch_container bash
Problem described here
To solve this you just need to run another bash in running bash, so it will have pid != 1.
Following this question, how do I launch instruments with iPhone simulator as a device.
I tried this:
$ instruments -t /Developer/Platforms/iPhoneOS.platform/Developer/Library/Instruments/PlugIns/AutomationInstrument.bundle/Contents/Resources/Automation.tracetemplate -w iphonesimulator5.0 MyApp.app
But I get this error:
Instruments Usage Error : Device failed to become ready for use.
-w <deviceID> is used only when you wish to specify a hardware device as the destination (the 'deviceID' here is the Identifier of the device, found in the Organizer of Xcode).
Instead of using -w, you can specify a flag during the build to force instruments to use iPhone. Details can be found here.
I was doing it as follows:
1.I created a template in which I was calling my UI Automation Main file that Triggers running all the scripts.
EX:
//Main.js file will run auto.js scripts
//auto.js is my main file in which I am running all the scripts
//Main.js file
#import "auto.js"
auto.run();
//Now open terminal and run the following command.
1. Go to the directory where you saved your template
2.Copy the location where you simulator (full path) is
Than run the command below:
instruments -t ./NameOfYourTemplate.tracetemplate /Users/swathyvalluri/Debug-iphonesimulator/MyApp.app
Note : Create a new file in the template and copy the contents into it what ever you want to put, otherwise it will look for Main.js file in your locally and will fail when running it on another server.
Please let me know if you need more help :)
Device id means here UDID of the device.
Also see the link below, it is very useful :
http://lemonjar.com/blog/?p=69