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tasks.py
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Thu, Sep 12, 10:17
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R3600 invenio-infoscience
tasks.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2014 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Implement Celery tasks for generating previews."""
import
os
from
flask
import
current_app
,
safe_join
from
invenio.base.globals
import
cfg
from
invenio.celery
import
celery
from
invenio.utils.shell
import
run_shell_command
# FIXME: subprocess.Popen
from
.utils
import
get_pdf_path
@celery.task
def
generate_preview
(
f
):
"""Generate PNG previews of PDF pages."""
directory
=
os
.
path
.
join
(
current_app
.
instance_path
,
"previews"
)
try
:
os
.
mkdir
(
directory
)
except
OSError
:
# directory already exists as per docs
pass
directory
=
os
.
path
.
join
(
directory
,
str
(
f
.
get_recid
()))
try
:
os
.
mkdir
(
directory
)
except
OSError
:
# directory already exists as per docs, preview exists
return
directory
cmd_pdftk
=
"pdftk
%s
burst output
%s
/pg_
%s
.pdf"
(
exit_status
,
output_std
,
output_err
)
=
\
run_shell_command
(
cmd_pdftk
,
args
=
(
get_pdf_path
(
f
),
directory
,
'
%d
'
))
cmd_pdftk
=
'
%s
-flatten -density 300
%s
%s
/`basename
%s
.pdf`.png'
for
fl
in
os
.
listdir
(
directory
):
if
fl
.
endswith
(
".pdf"
):
fn
=
safe_join
(
directory
,
fl
)
(
exit_status
,
output_std
,
output_err
)
=
\
run_shell_command
(
cmd_pdftk
,
args
=
(
str
(
cfg
[
"CFG_PATH_CONVERT"
]),
fn
,
directory
,
fn
))
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