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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2012 Étienne Loks <etienne.loks_AT_peacefrogsDOTnet>
# This program 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 3 of the
# License, or (at your option) any later version.
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
# See the file COPYING for details.
"""
Utilitaries
"""
import urllib2, re
from external_utils import OsmApi
from lxml import etree
from chimere import get_version
from django.conf import settings
from django.core.exceptions import ObjectDoesNotExist
from django.utils.translation import ugettext_lazy as _
class ImportManager:
u"""
Generic class for specific importers
"""
def __init__(self, importer_instance):
self.importer_instance = importer_instance
def get(self):
pass
def put(self):
pass
class KMLManager(ImportManager):
u"""
KML importer
The filtr argument has to be defined as the exact name of the folder to be
imported
"""
XPATH = '//kml:Folder/kml:name[text()="%s"]/../kml:Placemark'
def __init__(self, importer_instance, ns=''):
self.importer_instance = importer_instance
self.ns = ns
def get(self):
u"""
Get data from the source
Return a tuple with:
- number of new item ;
- number of item updated ;
- error detail on error
"""
from models import Marker
new_item, updated_item, msg = 0, 0, ''
try:
source = urllib2.urlopen(self.importer_instance.source)
except ValueError:
# assume it is a local file
try:
source = open(self.importer_instance.source)
except IOError, msg:
return (new_item, updated_item, msg)
except urllib2.URLError as error:
return (new_item, updated_item, error.message)
tree = etree.parse(source)
# try to get default namespace
if not self.ns:
self.ns = tree.getroot().nsmap[None]
for placemark in tree.xpath(self.XPATH % self.importer_instance.filtr,
namespaces={'kml':self.ns}):
name, point, linestring = None, None, None
pl_id = placemark.attrib.get('id')
pl_key = 'kml-%d' % self.importer_instance.pk
ns = '{%s}' % self.ns
for item in placemark:
if item.tag == ns + 'name':
name = item.text
elif item.tag == ns + 'description':
description = item.text
elif item.tag == ns + 'Point':
for coord in item:
if coord.tag == ns + 'coordinates':
x, y, z = coord.text.split(',')
point = 'SRID=4326;POINT(%s %s)' % (x, y)
if point:
dct = {'point':point,
'description':description,
'name':name,}
m = None
if pl_id:
dct_import = {
'import_key__icontains':'%s:%s;' % (pl_key, pl_id),
'import_source':self.importer_instance.source}
try:
m = Marker.objects.get(**dct_import)
for k in dct:
setattr(m, k, dct[k])
m.save()
updated_item += 1
except ObjectDoesNotExist:
m = None
dct.update({
'import_source':self.importer_instance.source})
if not m:
dct['status'] = 'I'
m = Marker.objects.create(**dct)
new_item += 1
if pl_id:
m.set_key(pl_key, pl_id)
m.categories.clear()
for cat in self.importer_instance.categories.all():
m.categories.add(cat)
return (new_item, updated_item, msg)
RE_NODE = re.compile('node\[([^\]]*)\]')
# manage deleted item from OSM
class OSMManager(ImportManager):
u"""
OSM importer
The source url is a path to an OSM file or a XAPI url
The filtr argument is XAPI args or empty if it is an OSM file.
"""
def get(self, get_items=None):
u"""
Get data from the source
Return a tuple with:
- new items or number of new items if nb_only = True;
- updated items or number of updated items if nb_only = True;
- error detail on error
"""
from models import Marker
new_item, updated_item = 0 , 0
items = []
msg = ''
try:
source = urllib2.urlopen(settings.CHIMERE_XAPI_URL+
self.importer_instance.filtr)
except ValueError:
# assume it is a local file
try:
source = open(self.importer_instance.source)
except IOError, msg:
return (new_item, updated_item, msg)
except urllib2.URLError as error:
return (new_item, updated_item, error.message)
tree = etree.parse(source)
for node in tree.xpath('//node'):
name, point, linestring = None, None, None
node_id = node.attrib.get('id')
version = node.attrib.get('version')
for item in node:
k = item.attrib.get('k')
if k == 'name':
name = item.attrib.get('v')
point = 'SRID=4326;POINT(%s %s)' % (node.get('lon'),
node.get('lat'))
if point:
dct = {'point':point,
'name':name,
'import_version':version}
m = None
if node_id:
dct_import = {
'import_key__icontains':'OSM:%s;' % (node_id),
'import_source':self.importer_instance.source}
try:
m = Marker.objects.get(**dct_import)
items.append(m)
if version and m.import_version == int(version):
# no update since the last import
continue
for k in dct:
setattr(m, k, dct[k])
m.save()
updated_item += 1
except ObjectDoesNotExist:
m = None
dct.update({
'import_source':self.importer_instance.source})
if not m:
dct['status'] = 'I'
m = Marker.objects.create(**dct)
new_item += 1
items.append(m)
if node_id:
m.set_key('OSM', node_id)
m.categories.clear()
for cat in self.importer_instance.categories.all():
m.categories.add(cat)
if not get_items:
return (new_item, updated_item, msg)
return (items, new_item, updated_item, msg)
def put(self):
# first of all: reimport in order to verify that no changes has been
# made since the last import
from models import Marker
items, new_item, updated_item, msg = self.get(get_items=True)
# check if import is possible
if msg:
return 0, msg
if new_item:
return 0, _(u"New items imported - validate them before exporting")
if Marker.objects.filter(status='I').count():
return 0, _(u"There are items from a former import not yet "
u"validated - validate them before exporting")
# start import
api = OsmApi.OsmApi(api=settings.CHIMERE_OSM_API_URL,
username=settings.CHIMERE_OSM_USER,
password=settings.CHIMERE_OSM_PASSWORD)
api.ChangesetCreate({u"comment": u"Import from Chimère %s" % \
get_version()})
tag = RE_NODE.finddall(self.importer_instance.filtr)
if not tag:
return 0, _(u"Bad param")
tag = tag[0].split('=')
default_dct = {'tag':{tag[0]:tag[1]},
'import_source':self.importer_instance.source}
for idx, item in Marker.objects.filter(status='A',
categories=self.importer_instance.categories.all()):
dct = default_dct.update({
'name':item.name,
'lon':item.point.lon,
'lat':item.point.lat})
node = None
import_key = marker.get_key('OSM')
if not import_key:
node = OsmApi.NodeCreate(dct)
item.set_key('OSM', node['id'])
else:
dct['id'] = import_key
node = OsmApi.NodeUpdate(dct)
item.import_version = node['version']
item.save()
api.ChangesetClose()
return idx+1, None
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