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import json
import os
from unittest import mock
import unittest
from pathlib import Path
from datetime import datetime
from io import BytesIO
from pywavefront import ObjParser, Wavefront
from pywavefront.parser import Parser
from pywavefront.exceptions import PywavefrontException
from pywavefront.cache import cache_name, meta_name
from utils import fixture
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTest(unittest.TestCase):
"""Create and load cache for a specific obj file"""
maxDiff = None
obj_file = fixture('simple.obj')
create_materials = False
def load_obj(self, filename, fake_io=None):
"""Helper method loading files with proper mocks"""
if not fake_io:
self.fake_io = FakeIO()
if not fake_io:
scene = Wavefront(filename, cache=True, create_materials=self.create_materials)
with mock.patch("pywavefront.cache.gzip.open", new=self.fake_io):
with mock.patch("pywavefront.cache.open", new=self.fake_io):
with mock.patch("pywavefront.cache.os.path.exists", new=self.fake_io.exisis):
if fake_io:
scene = Wavefront(filename, cache=True, create_materials=self.create_materials)
scene.parser.post_parse()
self.meta_file = self.obj_file.with_suffix(self.obj_file.suffix + '.json')
self.cache_file = self.obj_file.with_suffix(self.obj_file.suffix + '.bin')
return scene
@property
def meta(self):
return self.fake_io[self.meta_file].json()
@property
def cache(self):
return self.fake_io[self.cache_file]
def test_create(self):
scene = self.load_obj(self.obj_file)
# Sanity check cache data
self.assertTrue(self.meta.get('version'), msg="Missing version info in meta file: {}".format(self.meta))
self.assertEqual(self.meta['mtllibs'], scene.mtllibs)
self.assertEqual(self.cache.size, sum(len(m.vertices) for m in scene.materials.values()) * 4)
def test_load(self):
# Load the file creating a cache
scene_pre = self.load_obj(self.obj_file)
# Load again using cache
scene_post = self.load_obj(self.obj_file, self.fake_io)
self.assertFalse(scene_pre.parser.cache_loaded, msg="File was loaded from cache")
self.assertTrue(scene_post.parser.cache_loaded, msg="File was not loaded from cache")
# Compare pre and post cache
self.assertEqual(sorted(scene_pre.materials.keys()), sorted(scene_post.materials.keys()))
for name, pre_mat in scene_pre.materials.items():
post_mat = scene_post.materials[name]
self.assertNotEqual(pre_mat, post_mat) # Ensure they are differnt objects!
self.assertEqual(len(pre_mat.vertices), len(post_mat.vertices))
for a, b in zip(pre_mat.vertices, post_mat.vertices):
self.assertAlmostEqual(a, b, msg="{} != {}".format(pre_mat.vertices, post_mat.vertices))
self.assertEqual(pre_mat.vertex_format, post_mat.vertex_format)
self.assertEqual(pre_mat.name, post_mat.name)
def test_missing_meta(self):
# Load the file creating a cache
scene_pre = self.load_obj(self.obj_file)
# Be naughty deleting the meta file
del self.fake_io[self.meta_file]
# Load again using cache
scene_post = self.load_obj(self.obj_file, self.fake_io)
# No cache loader should be created
self.assertFalse(scene_pre.parser.cache_loaded)
self.assertFalse(scene_post.parser.cache_loaded)
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTestNoMaterials(CacheTest):
obj_file = fixture('simple_no_mtl.obj')
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTestSimpleColors(CacheTest):
obj_file = fixture('simple_colors.obj')
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTestNegativeIndices(CacheTest):
obj_file = fixture('simple_negative_indices.obj')
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTestNoObjNoMtl(CacheTest):
obj_file = fixture('simple_no_object_no_mtl.obj')
@mock.patch('pywavefront.parser.Parser.auto_post_parse', new=False)
class CacheTestUnknownMtl(CacheTest):
obj_file = fixture('simple_unknown_usemtl.obj')
create_materials = True
class FakeFileExists:
def __init__(self, fake_io):
self.fake_io = fake_io
def __call__(self, value):
return self.fake_io.exists(value)
class FakeIO:
"""A collection of files written during a mock session"""
def __init__(self):
self.files = {}
self.exisis = FakeFileExists(self)
def __call__(self, name, mode, *args, **kwargs):
"""Simulates open()"""
fake_file = self.files.get(name)
if not fake_file:
if 'w' in mode:
fake_file = FakeFile(name, mode)
self.files[str(name)] = fake_file
else:
raise IOError("File not found: {}\n{}".format(name, self.files))
return fake_file
def exists(self, value):
return self.files.get(value) is not None
def __getitem__(self, name):
return self.files[str(name)]
def __delitem__(self, name):
del self.files[str(name)]
class FakeFile:
"""Fake file object"""
def __init__(self, name, mode):
self.mode = mode
self.name = name
self.data = BytesIO()
self.size = 0
def __enter__(self):
return self
def __exit__(self, *args):
self.close()
def read(self, length=-1):
if length == -1:
if 'b' in self.mode:
return self.data.read()
return self.data.read().decode('utf-8')
if 'b' in self.mode:
return self.data.read(length)
return self.data.read(length).decode('utf-8')
def write(self, data):
if 'b' not in self.mode:
data = data.encode()
self.data.write(data)
def close(self):
self.size = self.data.tell()
self.data.seek(0)
def contents(self):
cont = self.data.read()
self.data.seek(0)
return cont
def json(self):
d = self.contents().decode()
return json.loads(d)
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