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  3. July 2017

Re: [IBMiOSS] How to debug NodeJs ?

Hi Kevin,

I wanted to clarify something...

VS Code is running your app locally on your PC, so it can't load stuff
that resides in your IBMi IFS.

What's important to note/contrast is VSCode is using the Node.js runtime on
your local PC and ~not~ the IBM i Node.js runtime. Further, this means you
~can~ load the source from the IFS via mapped drive**, but it will be run
in the local PC's Node.js runtime. In John's case it couldn't resolve path
/QOpenSys... which can be fixed. What ~can't~ be fixed is that the Node.js
DB2 adapter/driver is a native extension (compiled for PASE SQL CLIs on IBM
i). So even after resolving the path, it still most likely won't work.

The next question might be "What if I run Node.js v6.9.1 on both my local
PC and IBM i and don't use the native IBM i Node.js DB2 adapter/driver,
will I still have issues?" The answer is "it depends". For example, some
npms call out to OS file system commands/APIs (i.e futime) and not all of
those exist on IBM i. This means that it could work on your local PC while
in development but fail once deployed to production on IBM i. It's worth
nothing that some npms are only required during development so this isn't
an issue (i.e. devDependencies in package.json). The short answer is you
should also use the production Node.js runtime for your development Node.js
runtime to save from surprises. What I do is use the VSCode debugger in
small scenarios where I need to figure out what is going on and then I move
back to using the IBM i Node.js runtime for development once the issue has
been resolved.

** I use SSHFS. Learn more here: http://krengel.tech/mcpress-edit-ifs-files

​I hope what I said makes sense.​

Aaron Bartell
IBM i hosting, starting at $157/month. litmis.com/spaces


On Wed, Jul 26, 2017 at 10:07 AM, Kevin Turner <kevin.turner@xxxxxxxxxxxxxx>
wrote:


You missed the bit earlier in the email trail that said that this option
is only possible if your code is platform agnostic. Yours is not because
it is trying to load IBMi code from the IFS. VS Code is running your app
locally on your PC, so it can't load stuff that resides in your IBMi IFS.
You would need to have copies of this stuff within your project and
load/require it from there.

________________________________________
From: OpenSource [opensource-bounces@xxxxxxxxxxxx] on behalf of john art [
jhon_art@xxxxxxxxxxx]
Sent: 26 July 2017 15:47
To: IBMi Open Source Roundtable
Subject: Re: [IBMiOSS] How to debug NodeJs ?

[External Email]
________________________________



Hi Kevin

ok now is better ..

but when i try to debug a very simple js file i receive this error (in VS
Code debug view)

Error: Cannot find module '/QOpenSys/QIBM/ProdData/OPS/Node6/os400/db2i/lib/db2a'
at Function.Module._resolveFilename (module.js:469:15) at
Function.Module._load (module.js:417:25) at Module.require
(module.js:497:17) at require (internal/module.js:20:19) at
Object.<anonymous> (\\192.168.50.8\angelo\nodewebix\server.js:5:10) at
Module._compile (module.js:570:32) at Object.Module._extensions..js
(module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad
(module.js:446:12) at Function.Module._load (module.js:438:3)


i checked and in my As400 this file exist ..

where am i wrong and why in normal run i don't receive thsi error


thanks

________________________________
Da: OpenSource <opensource-bounces@xxxxxxxxxxxx> per conto di Kevin
Turner <kevin.turner@xxxxxxxxxxxxxx>
Inviato: mercoledì 26 luglio 2017 11:26:51
A: IBMi Open Source Roundtable
Oggetto: Re: [IBMiOSS] How to debug NodeJs ?


Make sure you are using VS Code (not VS). The two are completely
different.

When you are using the debug option you are running the code within VS -
it prompts you to create a profile to describe how it should launch the
application (i.e. which module to run). You don't need a browser for
debugging. You only need that if your application is a browser-based
application, so you would use the browser to interact with your app.

You'd be much better off following a VS Code debugging tutorial than
asking on here.

________________________________________
From: OpenSource [opensource-bounces@xxxxxxxxxxxx] on behalf of john art [
jhon_art@xxxxxxxxxxx]
Sent: 26 July 2017 10:19
To: IBMi Open Source Roundtable
Subject: Re: [IBMiOSS] How to debug NodeJs ?

[External Email]
________________________________



Hi

sorry but I have some difficulties to understand how VS debugger works ;

- i open the source in VS

- start debug in VS

- then i have to start the app with node ($ node index) ?

- then i have to open in browser my ?


sorry but don't undesrtand how to use/run it ..

can some one help me suggesting sone stesp by step link

Thanks in advance

________________________________
Da: OpenSource <opensource-bounces@xxxxxxxxxxxx> per conto di Brian May <
bmay@xxxxxxxxxxxxxxxxx>
Inviato: giovedì 20 luglio 2017 17:49:36
A: IBMi Open Source Roundtable
Oggetto: Re: [IBMiOSS] How to debug NodeJs ?

We also use VS Code for debugging. It is a very easy debugging
environment.

Brian May
Director
Pre-Sales and Customer Solutions
Profound Logic Software
http://www.profoundlogic.com
937-439-7925 Phone
877-224-7768 Toll Free


The IBM i Modernization Experts
www.profoundlogic.com<http://www.profoundlogic.com<http://
www.profoundlogic.com<http://www.profoundlogic.com>>



Profound.js: Agile, Connected, Secure
Bring the benefits of Node.js and Agile Modernization to your IBM i
Enterprise
Click here to learn more


-----Original Message-----
From: OpenSource [mailto:opensource-bounces@xxxxxxxxxxxx] On Behalf Of
Kevin Turner
Sent: Thursday, July 20, 2017 10:42 AM
To: IBMi Open Source Roundtable <opensource@xxxxxxxxxxxx>
Subject: Re: [IBMiOSS] How to debug NodeJs ?

I use VS code for debugging because our stuff is generally platform
agnostic. We also use winston for logging - so you can output debug logs
when running in debug mode that don't clutter logs in prod mode.


[https://www.netcracker.com/assets/img/netcracker-social-final.png] ƕ On
20 Jul 2017, at 16:34, Aaron Bartell <aaronbartell@xxxxxxxxx> wrote:

[External Email]
________________________________



Hi John,

Debugging Node.js can be done in a variety of fashions. Here's what I
currently do...

- REPL. The Node.js REPL is great for quickly testing smaller chunks
of code in PASE. I use this frequently to test my iterations of
formulating the correct parm lists for calling RPG programs.

- console.log(). Not ideal, but it works.

- If the code is platform agnostic then you can use the VSCode step
debugger (note this will eventually work for Node.js in PASE once IBM
addresses the node-inspector issue).

- Certain web frameworks have debug output capabilities while in
development mode. For example, ExpressJs debugging
<https://expressjs.com/en/guide/debugging.html>.

Aaron Bartell
IBM i hosting, starting at $157/month. litmis.com/spaces


On Wed, Jul 19, 2017 at 12:35 PM, john art <jhon_art@xxxxxxxxxxx>
wrote:


if node-inspecto don't work (if i wel understand) , how can i debug
nodeJs ?

Thanks in advance

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