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import datetime
import json
import importlib
import os
import tempfile
import zipfile
from rest_framework import serializers
from zipfile import ZipFile
from django.apps import apps
from django.contrib.sites.models import Site
from django.core.serializers import deserialize, serialize
from version import get_version
from . import models
class PublicSerializer(serializers.BaseSerializer):
def to_representation(self, obj):
return obj.public_representation()
SERIALIZATION_VERSION = "1.0"
def get_model_from_filename(filename):
filename = filename.split(".")[0] # remove extension
module_name, model_name = filename.split("__")
module = importlib.import_module(module_name + ".models")
return getattr(module, model_name)
def serialization_info():
site = Site.objects.get_current()
return {
"serialize-version": SERIALIZATION_VERSION,
"ishtar-version": get_version(),
"domain": site.domain,
"name": site.name,
"date": datetime.datetime.now().isoformat()
}
def type_serialization(archive=False, return_empty_types=False,
archive_name=None):
"""
Serialize all types models to JSON
Used for import and export scripts
:param return_empty_types: if True instead of serialization return empty
types (default False)
:param archive: if True return a zip file containing all the file serialized
(defaukt False)
:return: string containing the json serialization of types unless
return_empty_types or archive is set to True
"""
if archive and return_empty_types:
raise ValueError("archive and return_empty_types are incompatible")
result = {}
for model in apps.get_models():
if not isinstance(model(), models.GeneralType):
continue
model_name = model.__name__
model_name = str(model.__module__).split(".")[0] + "__" + model_name
base_q = model.objects
q = base_q
recursion = None
if hasattr(model, "parent"):
recursion = "parent"
elif hasattr(model, "inverse_relation"):
recursion = "inverse_relation"
if recursion:
q = q.filter(**{recursion + "__isnull": True})
result[model_name] = serialize(
"json", q.all(),
indent=2,
use_natural_foreign_keys=True, use_natural_primary_keys=True
)
if recursion:
serialized = [item["id"] for item in q.values("id").all()]
q = base_q.filter(**{recursion + "_id__in": serialized}
).exclude(id__in=serialized)
while q.count():
v = serialize(
"json", q.all(), indent=2, use_natural_foreign_keys=True,
use_natural_primary_keys=True)
new_result = json.loads(result[model_name])
new_result += json.loads(v)
result[model_name] = json.dumps(new_result, indent=2)
serialized += [item["id"] for item in q.values("id").all()]
q = base_q.filter(**{recursion + "_id__in": serialized}
).exclude(id__in=serialized)
if return_empty_types:
return [k for k in result if not result[k]]
if not archive:
return result
if not archive_name:
tmpdir = tempfile.mkdtemp(prefix="ishtarexport-") + os.sep
archive_name = tmpdir + "ishtar-{}.zip".format(
datetime.date.today().strftime("%Y-%m-%d")
)
if not archive_name.endswith(".zip"):
archive_name += ".zip"
with tempfile.TemporaryDirectory() as tmpdirname:
os.mkdir(tmpdirname + os.sep + "types")
with ZipFile(archive_name, 'w') as current_zip:
base_filename = "info.json"
filename = tmpdirname + os.sep + base_filename
with open(filename, "w") as json_file:
json_file.write(
json.dumps(serialization_info(), indent=2)
)
current_zip.write(filename, arcname=base_filename)
for model_name in result:
base_filename = model_name + ".json"
filename = tmpdirname + os.sep + base_filename
with open(filename, "w") as json_file:
json_file.write(result[model_name])
current_zip.write(filename,
arcname="types" + os.sep + base_filename)
return archive_name
def restore_serialized(archive_name, delete_existing=False):
with zipfile.ZipFile(archive_name, "r") as zip_file:
# check version
info = json.loads(zip_file.read("info.json").decode("utf-8"))
if info["serialize-version"] != SERIALIZATION_VERSION:
raise ValueError(
"This dump version: {} is not managed by this Ishtar "
"installation".format(info["serialize-version"])
)
# restore types
for json_filename in zip_file.namelist():
path = json_filename.split(os.sep)
if len(path) != 2 or path[0] != "types":
continue
if delete_existing:
model = get_model_from_filename(path[-1])
model.objects.all().delete()
data = zip_file.read(json_filename).decode("utf-8")
for obj in deserialize("json", data):
obj.save()
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