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

Thomas Kremmel thomasspin at gmail.com
Thu Apr 15 14:29:43 EDT 2010

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Ok I'm back to strange behavior ;-)

This time just after one hour the old behavior occurs. The behavior works
like this:

p.setFont('Calibri', 7) is throwing an keyError although I check
if pdfmetrics._fonts.has_key('Calibri') and if not I register the font.
Registering the font always works out.
Interestingly it obviously crashes in these both occasions..

1. _fonts.has_key('Calibri') is True -> font was already registered before
2. _fonts.has_key('Calibri') is False -> font will be registered exactly for
this request

And more interestingly.. it just crashes each 3-5 call...which confuses me
much more!
Furthermore I would expect that after the first registerFont call the
subsequent requests should not have to re-register the font. But obviously
it behaves that it sometimes reregister the font and sometimes it does not.

##after restart of the server everything works fine.

[Thu Apr 15 00:25:53 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:53 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:25:54 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:54 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:25:58 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:58 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:25:59 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:26:04 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:26:04 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull
[Thu Apr 15 00:26:05 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 00:26:05 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,

##after one hour break I tried it again and started directly with an error.
following with two successfull requests and a final crashing request

[Thu Apr 15 01:47:39 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 01:47:39 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: error in line p.setFont('Calibri', 7),
[Thu Apr 15 01:47:39 2010] [error] [client 127.0.0.1] 'Calibri',
[Thu Apr 15 01:47:46 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True,
[Thu Apr 15 01:47:46 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull,
[Thu Apr 15 01:47:47 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True,
[Thu Apr 15 01:47:47 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: p.setFont('Calibri', 7) was successfull,
[Thu Apr 15 01:47:48 2010] [error] [client 127.0.0.1]
pdfmetrics._fonts.has_key('Calibri') is True
[Thu Apr 15 01:47:48 2010] [error] [client 127.0.0.1] view:
export_objects_as_pdf: info: error in line p.setFont('Calibri', 7)
[Thu Apr 15 01:47:48 2010] [error] [client 127.0.0.1] 'Calibri'

The 'Calibri' output is a KeyError: 'Calibri' , I don't know why just
'Calibri' is printed out.

2010/4/15 Thomas Kremmel <thomasspin at gmail.com>

> 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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