Create the specified temporary directory when Loris starts (#447)

* Add a test to show that Loris doesn't create the temp directory

* Ensure Loris creates the temp directory on startup

* Add a test for directory creation in InfoCache

* Remove a missing import from webapp_t.py

loris/webapp.py

@@ -41,7 +41,7 @@
     SyntaxException,
     TransformException,
 )
-
+from loris.utils import mkdir_p
 
 
 getcontext().prec = 25 # Decimal precision. This should be plenty.
@@ -328,6 +328,12 @@ def __init__(self, app_configs={}):
         # make the loris.Loris configs attrs for easier access
         _loris_config = self.app_configs['loris.Loris']
         self.tmp_dp = _loris_config['tmp_dp']
+
+        try:
+            mkdir_p(self.tmp_dp)
+        except Exception as exc:
+            raise ConfigError("Error creating tmp_dp %s: %r" % (self.tmp_dp, exc))
+
         self.www_dp = _loris_config['www_dp']
         self.enable_caching = _loris_config['enable_caching']
         self.redirect_canonical_image_request = _loris_config['redirect_canonical_image_request']

tests/img_info_t.py

@@ -581,3 +581,20 @@ def test_looking_up_missing_item_is_keyerror(self):
 
         with pytest.raises(KeyError):
             cache[req]
+
+    def test_creates_cache_dir(self):
+        root = os.path.join(tempfile.mkdtemp(), "doesnotexist")
+        assert not os.path.exists(root)
+        cache = img_info.InfoCache(root=root)
+        path = self.test_jpeg_fp
+        req = webapp_t._get_werkzeug_request(path=path)
+
+        info = img_info.ImageInfo(
+            app=self.app,
+            ident=self.test_jpeg_uri,
+            src_img_fp=self.test_jpeg_fp,
+            src_format=self.test_jpeg_fmt
+        )
+
+        cache[req] = info
+        assert cache[req][0] == info

tests/webapp_t.py

@@ -19,6 +19,7 @@
 from loris.authorizer import NullAuthorizer
 from loris.loris_exception import ConfigError
 from loris.transforms import KakaduJP2Transformer, OPJ_JP2Transformer
+from loris.webapp import get_debug_config, Loris
 from tests import loris_t
 
 
@@ -585,6 +586,21 @@ def test_cleans_up_when_not_caching(self):
             pass
         self._assert_tmp_has_no_files()
 
+    def test_can_use_tmp_dir_for_transforms(self):
+        config = get_debug_config('kdu')
+        config["loris.Loris"]["tmp_dp"] = "/tmp/doesnotexist"
+        self.build_client_from_config(config)
+
+        assert self.app.tmp_dp == "/tmp/doesnotexist"
+
+        self.client.get("/%s/full/full/0/default.jpg" % self.test_jpeg_id)
+
+    def test_invalid_tmp_dir_is_configerror(self):
+        config = get_debug_config('kdu')
+        config["loris.Loris"]["tmp_dp"] = "/dev/null/tmp"
+        with pytest.raises(ConfigError, match="Error creating tmp_dp /dev/null/tmp:"):
+            Loris(config)
+
     def _assert_tmp_has_no_files(self):
         # callback should delete the image before the test ends, so the tmp dir
         # should not contain any files (there may be dirs)