1 files changed, 128 insertions, 0 deletions
diff --git a/chimere/tasks.py b/chimere/tasks.py
new file mode 100644
index 0000000..9eff7f5
--- /dev/null
+++ b/chimere/tasks.py
@@ -0,0 +1,128 @@
+#!/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.
+
+from django.conf import settings
+if 'kombu.transport.django' in settings.INSTALLED_APPS \
+   and 'djcelery' in settings.INSTALLED_APPS:
+    from celery.decorators import task
+
+from django.core.cache import cache
+from django.core.exceptions import ObjectDoesNotExist
+from django.utils.translation import ugettext_lazy as _
+
+from chimere.models import Importer
+from external_utils import OsmApi
+
+
+def single_instance_task(timeout):
+    def task_exc(func):
+        def wrapper(*args, **kwargs):
+            return func(*args, **kwargs)
+        return wrapper
+    return task_exc
+
+if 'task' in globals():
+    def single_instance_task(timeout):
+        def task_exc(func):
+            def wrapper(*args, **kwargs):
+                lock_id = "celery-single-instance-" + func.__name__
+                acquire_lock = lambda: cache.add(lock_id, "true", timeout)
+                release_lock = lambda: cache.delete(lock_id)
+                if acquire_lock():
+                    try:
+                        func(*args, **kwargs)
+                    finally:
+                        release_lock()
+            return wrapper
+        return task_exc
+else:
+    def task():
+        def task_exc(func):
+            def wrapper(*args, **kwargs):
+                func(*args, **kwargs)
+            return wrapper
+        return task_exc
+
+IMPORT_MESSAGES = {
+    'import_pending': [_(u"Import pending")],
+    'import_process': [_(u"Import processing")],
+    'import_done': [_(u"Import successfuly done"),
+                    _(u" %(new)d new item(s), %(updated)d updated item(s)")],
+    'import_failed': [_(u"Import failed"), "%s"],
+    'import_cancel': [_(u"Import canceled")],
+    'export_pending': [_(u"Export pending")],
+    'export_process': [_(u"Export processing")],
+    'export_done': [_(u"Export successfuly done"),
+                    _(u" %(updated)d updated item(s)")],
+    'export_failed': [_(u"Export failed"), "%s"],
+    'export_cancel': [_(u"Export canceled")]
+}
+
+
+@task()
+def importing(importer_pk):
+    try:
+        importer = Importer.objects.get(pk=importer_pk)
+    except ObjectDoesNotExist:
+        # importer doesn't exists anymore: too late!
+        return
+    if importer.state != IMPORT_MESSAGES['import_pending'][0]:
+        # import canceled or done
+        return
+    importer.state = unicode(IMPORT_MESSAGES['import_process'][0])
+    importer.save()
+    new_item, updated_item, error = importer.manager.get()
+    importer.state = error + '\n' if error else ''
+    importer.state += unicode(IMPORT_MESSAGES['import_done'][0])
+    importer.state += \
+        u" - " + unicode(IMPORT_MESSAGES['import_done'][1]) % {
+            'new': new_item, 'updated': updated_item}
+    importer.state = importer.state
+    importer.save()
+    return True
+
+
+@task()
+@single_instance_task(60 * 10)
+def exporting(importer_pk, extra_args=[]):
+    try:
+        importer = Importer.objects.get(pk=importer_pk)
+    except ObjectDoesNotExist:
+        # importer doesn't exists anymore: too late!
+        return
+    if importer.state != IMPORT_MESSAGES['export_pending'][0]:
+        # import canceled or done
+        return
+    importer.state = unicode(IMPORT_MESSAGES['export_process'][0])
+    importer.save()
+    error = None
+    try:
+        updated_item, error = importer.manager.put(extra_args)
+    except OsmApi.ApiError, error:
+        pass
+    if error:
+        importer.state = unicode(IMPORT_MESSAGES['export_failed'][0]) \
+            + u" - " + unicode(IMPORT_MESSAGES['export_failed'][1]) % error
+        importer.save()
+        return
+    importer.state = unicode(IMPORT_MESSAGES['export_done'][0]) + u" - " \
+        + unicode(IMPORT_MESSAGES['export_done'][1]) % {
+            'updated': updated_item}
+    importer.save()
+    return True