Bug 73269 - install error callback to redirect errors to the GLib logging framework
Summary: install error callback to redirect errors to the GLib logging framework
Status: RESOLVED FIXED
Alias: None
Product: poppler
Classification: Unclassified
Component: glib frontend (show other bugs)
Version: unspecified
Hardware: Other All
: medium enhancement
Assignee: poppler-bugs
QA Contact:
URL:
Whiteboard:
Keywords:
: 57131 (view as bug list)
Depends on:
Blocks:
 
Reported: 2014-01-03 22:55 UTC by Christian Persch (GNOME)
Modified: 2014-07-06 10:39 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Attachments
proposed patch (5.39 KB, text/plain)
2014-01-03 22:55 UTC, Christian Persch (GNOME)
Details
new patch (1.88 KB, patch)
2014-01-19 12:21 UTC, Christian Persch (GNOME)
Details | Splinter Review
updated patch (1.87 KB, patch)
2014-01-19 12:25 UTC, Christian Persch (GNOME)
Details | Splinter Review
make the strings a bit more informative (1.89 KB, patch)
2014-01-19 12:45 UTC, Christian Persch (GNOME)
Details | Splinter Review
updated patch (1.85 KB, patch)
2014-01-19 17:54 UTC, Christian Persch (GNOME)
Details | Splinter Review

Description Christian Persch (GNOME) 2014-01-03 22:55:01 UTC
Created attachment 91474 [details]
proposed patch

The poppler library outputs some warnings (PDF syntax warnings/error etc) to stderr by default. For evince, we want to suppress that output by default, so we need some poppler-glib API to wrap setErrorCallback from Error.h (we don't want to use poppler internal APIs directly in evince).
Comment 1 Christian Persch (GNOME) 2014-01-19 12:19:34 UTC
After discussing this on IRC, we came up with a different scheme where instead of creating new API, we just redirect the messages to the GLib logging framework.  Since there's no single entry point in the public poppler-glib API, we just use a library constructor for this.
Comment 2 Christian Persch (GNOME) 2014-01-19 12:21:48 UTC
Created attachment 92383 [details] [review]
new patch
Comment 3 Christian Persch (GNOME) 2014-01-19 12:25:34 UTC
Created attachment 92384 [details] [review]
updated patch
Comment 4 Christian Persch (GNOME) 2014-01-19 12:45:46 UTC
Created attachment 92386 [details] [review]
make the strings a bit more informative

Patch tested with evince, works fine. By default, nothing is printed; run with G_MESSAGES_DEBUG=Poppler (or =all) to see the messages.
Comment 5 Carlos Garcia Campos 2014-01-19 15:29:53 UTC
Comment on attachment 92384 [details] [review]
updated patch

I guess this one is obsolete now
Comment 6 Carlos Garcia Campos 2014-01-19 15:46:32 UTC
Comment on attachment 92386 [details] [review]
make the strings a bit more informative

Review of attachment 92386 [details] [review]:
-----------------------------------------------------------------

Yes, a lot simpler, and we don't need new API nor even change evince.

::: glib/poppler.cc
@@ +90,5 @@
> +      category == errCommandLine ||
> +      category == errNotAllowed)
> +    return;
> +
> +  g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO,

Shouldn't we use "Poppler" as log domain?

@@ +95,5 @@
> +         "%s at position %" G_GOFFSET_FORMAT ": %s",
> +         cat_str[category], (goffset) pos, message);
> +}
> +
> +static void poppler_constructor (void) __attribute__((__constructor__));

Why do you need this prototype? I think you can annotate the method directly, for example:

static void __attribute__((__constructor__)) poppler_constructor (void)
{
  setErrorCallback (error_cb, NULL);
}
Comment 7 Christian Persch (GNOME) 2014-01-19 17:54:26 UTC
Created attachment 92409 [details] [review]
updated patch

(In reply to comment #6)
> > +  g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO,
> 
> Shouldn't we use "Poppler" as log domain?

It does; G_LOG_DOMAIN is #define'd to "Poppler" in Makefile.am (INCLUDES).

> > +static void poppler_constructor (void) __attribute__((__constructor__));
> 
> Why do you need this prototype? I think you can annotate the method
> directly, for example:
> 
> static void __attribute__((__constructor__)) poppler_constructor (void)
> {
>   setErrorCallback (error_cb, NULL);
> }

Fixed.
Comment 8 Carlos Garcia Campos 2014-01-21 13:47:44 UTC
(In reply to comment #7)
> Created attachment 92409 [details] [review] [review]
> updated patch
> 
> (In reply to comment #6)
> > > +  g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO,
> > 
> > Shouldn't we use "Poppler" as log domain?
> 
> It does; G_LOG_DOMAIN is #define'd to "Poppler" in Makefile.am (INCLUDES).

Oh, right!

> > > +static void poppler_constructor (void) __attribute__((__constructor__));
> > 
> > Why do you need this prototype? I think you can annotate the method
> > directly, for example:
> > 
> > static void __attribute__((__constructor__)) poppler_constructor (void)
> > {
> >   setErrorCallback (error_cb, NULL);
> > }
> 
> Fixed.

Pushed to git master, thank you very much.
Comment 9 Pino Toscano 2014-07-06 10:39:04 UTC
*** Bug 57131 has been marked as a duplicate of this bug. ***


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