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In-Reply-To: <73a35675dff31a1eaf76b67af567194e@bastelstu.be>
Date: Mon, 28 Jul 2025 14:48:15 +0300
Message-ID: <CAF-mU4xFaRExJdpMAnXTD3rVHnM=k=Kdv5QAh4v7+CJ4V0-e2w@mail.gmail.com>
Subject: Re: [PHP-DEV] [DISCUSSION] User-land Throwable
Cc: PHP internals <internals@lists.php.net>
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From: raveren@gmail.com (=?UTF-8?Q?Rokas_=C5=A0leinius?=)

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On Mon, 28 Jul 2025 at 13:56, Tim D=C3=BCsterhus <tim@bastelstu.be> wrote:

> Hi
>
> Am 2025-07-28 11:41, schrieb Dmitry Derepko:
> > A few years ago I found that a library printed error traces wrong.
> > After a little research I found that there was a mix of 3rd party
> > integration error + raised error around the current bridge
> > implementation
> > (http client).
> >
> > There were several PHP applications with microservices architecture
> > which I
> > had access to (docker + sources).
> >
> > So having the message and traces I'd like to have an error chain as it
> > can
> > be done chaining several errors through a new Exception(previous: $e).
> > But PHP does not allow you to manually implement Throwable. Instead you
> > should extend Exception. But after that you still cannot override the
> > getTrace() method because it's final.
> >
> > So my proposal is pretty simple: Remove both restrictions.
>
> I'm afraid I don't quite understand what actual goal you intend to solve
> with the proposal. The description of your use case is very abstract,
> can you provide a real-world example of a use-case you want to enable?
>
> Best regards
> Tim D=C3=BCsterhus
>

| real-world example of a use-case you want to enable

Say I am implementing a job runner, I do its error handling, and I want to
enrich the caught exception with additional helpful data for debugging. In
this process I create a custom exception MyJobHandlerException, but the
trace of the new exception includes my handler code, which the end user
does not care about. I wish to overwrite the trace of the new
MyJobHandlerException instance with the trace from the originally caught
exception, but I cannot.

I was always sure that the reason behind all methods of \Exception being
final is Larry-Garfield-blogpost length/depth so I never bothered to ask
and made workarounds.

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<div dir=3D"ltr"><div dir=3D"ltr"><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Mon, 28 Jul 2025 at 13:56, Tim D=C3=BCster=
hus &lt;<a href=3D"mailto:tim@bastelstu.be" target=3D"_blank">tim@bastelstu=
.be</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x">Hi<br>
<br>
Am 2025-07-28 11:41, schrieb Dmitry Derepko:<br>
&gt; A few years ago I found that a library printed error traces wrong.<br>
&gt; After a little research I found that there was a mix of 3rd party<br>
&gt; integration error + raised error around the current bridge <br>
&gt; implementation<br>
&gt; (http client).<br>
&gt; <br>
&gt; There were several PHP applications with microservices architecture <b=
r>
&gt; which I<br>
&gt; had access to (docker + sources).<br>
&gt; <br>
&gt; So having the message and traces I&#39;d like to have an error chain a=
s it <br>
&gt; can<br>
&gt; be done chaining several errors through a new Exception(previous: $e).=
<br>
&gt; But PHP does not allow you to manually implement Throwable. Instead yo=
u<br>
&gt; should extend Exception. But after that you still cannot override the<=
br>
&gt; getTrace() method because it&#39;s final.<br>
&gt; <br>
&gt; So my proposal is pretty simple: Remove both restrictions.<br>
<br>
I&#39;m afraid I don&#39;t quite understand what actual goal you intend to =
solve <br>
with the proposal. The description of your use case is very abstract, <br>
can you provide a real-world example of a use-case you want to enable?<br>
<br>
Best regards<br>
Tim D=C3=BCsterhus<br></blockquote><div><br></div><div style=3D"font-family=
:tahoma,sans-serif;font-size:small;color:rgb(102,51,0)" class=3D"gmail_defa=
ult">|=C2=A0<span class=3D"gmail_default" style=3D"font-family:tahoma,sans-=
serif;font-size:small;color:rgb(102,51,0)"></span>real-world example of a u=
se-case you want to enable<div style=3D"font-family:tahoma,sans-serif;font-=
size:small;color:rgb(102,51,0)" class=3D"gmail_default"><br></div><div styl=
e=3D"font-family:tahoma,sans-serif;font-size:small;color:rgb(102,51,0)" cla=
ss=3D"gmail_default">Say
 I am implementing a job runner, I do its error handling, and I want to=20
enrich the caught exception with additional helpful data for debugging.=20
In this process I create a custom exception MyJobHandlerException, but=20
the trace of the new exception includes my handler code, which the end=20
user does not care about. I wish to overwrite the trace of the new=20
MyJobHandlerException instance with the trace from the originally caught
 exception, but I cannot.</div><div style=3D"font-family:tahoma,sans-serif;=
font-size:small;color:rgb(102,51,0)" class=3D"gmail_default"><br></div><div=
 style=3D"font-family:tahoma,sans-serif;font-size:small;color:rgb(102,51,0)=
" class=3D"gmail_default">I
 was always sure that the reason behind all methods of \Exception being=20
final is Larry-Garfield-blogpost length/depth so I never bothered to ask
 and made workarounds.</div>

</div></div></div>
</div>

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