[reportlab-users] registerFont stays how long in memory? what s the best place to register a font?

[Thomas Kremmel]

Sorry was wrong with the fonts. Fonts are read from the file system..
But it would work using a http:// instead of a file system path. I used that
once and it worked, but in this list a user told me that I should not do it
that way ;-) Thus fonts are read from the file system.

Yes I would agree with you that things should fail either all the time or
never.
I advised my admin to complete re-install rl with all libs in the rl_addons
package and the result is that everything worked as before. PDF generation
is running smoothly and 100% of the calls are successfully conducted. This
was how my source behaved the day before yesterday. Then after one day the
strange behavior started. Thus I will try tomorrow whether this problems
reoccur. For your information, _rl_accel was already installed before. Thus
that has nothing to do with my problems.

Here is a list of additional information one could need to understand the
problem:

environment:
apache with mod_wsgi
django 1.1.1


Reportlab version 2.4
_rl_accel.pyd installed

1. ReportLab Toolkit - open source PDF library... version 2.4
        (in C:\Python25\lib\site-packages\reportlab\__init__.pyc)

2. _rl_accel extension module... found version 0.61
        (in C:\Python25\lib\site-packages\_rl_accel.pyd)

3. Python Imaging Library... found
        (in C:\Python25\lib\site-packages\PIL)

4. _renderPM extension module... found version 1.06
        (in C:\Python25\lib\site-packages\_renderPM.pyd)

5. pyRXP xml parser... not found


!simpliefied! django view:

def export_objects_as_pdf(request, model, object_list, user_object,
project_name, filename, month, year, billing_company, work_day_print_switch,
work_place_print_switch, LIST_HEADERS=None):
    rl_config.warnOnMissingFontGlyphs = 0

    try:
        if not pdfmetrics._fonts.has_key('Calibri'):
            pdfmetrics.registerFont(TTFont('Calibri', settings.FONT_DIR +
'/fonts/Calibri.ttf'))
            pdfmetrics.registerFont(TTFont('Calibri-Bold', settings.FONT_DIR
+ '/fonts/Calibri-bold.ttf'))
            if settings.WSGI_LOGGING is True:
                print >> request.environ['wsgi.errors'], "view:
export_objects_as_pdf: info: pdfmetrics._fonts.has_key('Calibri') is False -
Successfully registered Calibri and Calibri-Bold Font"
        else:
            if settings.WSGI_LOGGING is True:
                print >> request.environ['wsgi.errors'],
"pdfmetrics._fonts.has_key('Calibri') is True"
    except Exception, e:
        if settings.WSGI_LOGGING is True:
                print >> request.environ['wsgi.errors'], "view:
export_objects_as_pdf: info: error while registering font"
                print >> request.environ['wsgi.errors'], str(e)
        request.user.message_set.create(message='Font could not be read from
file system. Please try again or contact your system administrator.')
        return 0

    response = HttpResponse(mimetype='application/pdf')
    response['Content-Disposition'] = 'attachment; filename=%s' % filename
    buffer = StringIO()
    PAGESIZE = pagesizes.portrait(pagesizes.A4)

    #COLOR definition
    my_gray = colors.Color(.82,.82,.82)

    try:
        company_cd_color1_rr = float(billing_company.cd_colour1_rr) /
float(255)
        company_cd_color1_gg = float(billing_company.cd_colour1_gg) /
float(255)
        company_cd_color1_bb = float(billing_company.cd_colour1_bb) /
float(255)
        company_cd_color1 =
colors.Color(company_cd_color1_rr,company_cd_color1_gg,company_cd_color1_bb)
    except Exception:
        #print "value error in creating colors"
        request.user.message_set.create(message='Company Color could not be
loaded. Please contact your system administrator.')
        company_cd_color1 = colors.Color(0,0,0)

    # Create the PDF object, using the StringIO object as its "file."
    p = canvas.Canvas(buffer,pagesize=PAGESIZE)
    try:
        p.setFont("Calibri", 7)
        print >> request.environ['wsgi.errors'], "view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull"
    except KeyError, e:
        if settings.WSGI_LOGGING is True:
                print >> request.environ['wsgi.errors'], "view:
export_objects_as_pdf: info: error in line p.setFont('Calibri', 7)"
                print >> request.environ['wsgi.errors'], str(e)
        request.user.message_set.create(message='Font could not be loaded.
Please try again or contact your system administrator.')
        return 0

    try:
        path = fetch_resources(billing_company.logo_img.path)
        company_img = Image(path,40,7)
        company_img.drawOn(p, 500, 790)
    except:
        #could not find file
        request.user.message_set.create(message='Company Logo could not be
loaded. Please contact your system administrator.')
        pass
    #here we draw the pdf .. removed it since i just want to show the
relevant parts

    # Close the PDF object cleanly.
    p.showPage()
    p.save()

    # Get the value of the StringIO buffer and write it to the response.
    pdf = buffer.getvalue()
    buffer.close()
    response.write(pdf)
    return response


!WSGI Logging!

[Thu Apr 15 00:18:44 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: pdfmetrics._fonts.has_key('Calibri') is False -
Successfully registered Calibri and Calibri-Bold Font
[Thu Apr 15 00:18:44 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull

[Thu Apr 15 00:26:07 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:26:07 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:26:08 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:26:08 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull

This logging is how it should behave. I will check the logs tomorrow when
the error occurs again how the login changes and will post it here.
best regards
Thomas





2010/4/15 Andy Robinson <andy at reportlab.com>


> On 15 April 2010 14:17, Thomas Kremmel <thomasspin at gmail.com> wrote:

> >>> Is there just one machine, or some kind of a cluster?

> > one machine, but static content (like fonts, pictures) are served via a

> > separate server.

>

> Images I understand, but fonts?  We have always loaded our fonts off

> the server file system.  Is your settings.FONTDIR some kind of

> 'http://' URL instead of a file system path?   This MIGHT work - I

> don't know - but it's your server side that needs the font, not their

> browser.

>

>

> > _rl_accel

> I'm still very surprised at the inconsistency.  Please let us know in

> a day or two if it's stable.  If so we still have an issue to look

> into.  IMHO if _rl_accel is missing then either things should fail

> obviously 100% of the time (with a clue in the traceback), or work

> robustly but just a bit slower.

>

> - Andy

> _______________________________________________

> reportlab-users mailing list

> reportlab-users at lists2.reportlab.com

> http://two.pairlist.net/mailman/listinfo/reportlab-users

>

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