Fixed '/' prepend bug in ABSStore

docs/release.rst

@@ -55,6 +55,13 @@ Upcoming Release
 * Add documentation build to CI.
   By :user:`James Bourbeau <jrbourbeau>`; :issue:`516`.
 
+Bug fixes
+~~~~~~~~~
+
+* Fix '/' prepend bug in ``ABSStore``.
+  By :user:`Shikhar Goenka <shikharsg>`; :issue:`525`.
+
+
 .. _release_2.3.2:
 
 2.3.2

zarr/storage.py

@@ -1964,7 +1964,7 @@ class ABSStore(MutableMapping):
     In order to use this store, you must install the Microsoft Azure Storage SDK for Python.
     """
 
-    def __init__(self, container, prefix, account_name=None, account_key=None,
+    def __init__(self, container, prefix='', account_name=None, account_key=None,
                  blob_service_kwargs=None):
         from azure.storage.blob import BlockBlobService
         self.container = container
@@ -1990,21 +1990,25 @@ def __setstate__(self, state):
         self.client = BlockBlobService(self.account_name, self.account_key,
                                        **self.blob_service_kwargs)
 
-    @staticmethod
-    def _append_path_to_prefix(path, prefix):
-        return '/'.join([normalize_storage_path(prefix),
-                         normalize_storage_path(path)])
+    def _append_path_to_prefix(self, path):
+        if self.prefix == '':
+            return normalize_storage_path(path)
+        else:
+            return '/'.join([self.prefix, normalize_storage_path(path)])
 
     @staticmethod
     def _strip_prefix_from_path(path, prefix):
         # normalized things will not have any leading or trailing slashes
         path_norm = normalize_storage_path(path)
         prefix_norm = normalize_storage_path(prefix)
-        return path_norm[(len(prefix_norm)+1):]
+        if prefix:
+            return path_norm[(len(prefix_norm)+1):]
+        else:
+            return path_norm
 
     def __getitem__(self, key):
         from azure.common import AzureMissingResourceHttpError
-        blob_name = '/'.join([self.prefix, key])
+        blob_name = self._append_path_to_prefix(key)
         try:
             blob = self.client.get_blob_to_bytes(self.container, blob_name)
             return blob.content
@@ -2013,13 +2017,13 @@ def __getitem__(self, key):
 
     def __setitem__(self, key, value):
         value = ensure_bytes(value)
-        blob_name = '/'.join([self.prefix, key])
+        blob_name = self._append_path_to_prefix(key)
         self.client.create_blob_from_bytes(self.container, blob_name, value)
 
     def __delitem__(self, key):
         from azure.common import AzureMissingResourceHttpError
         try:
-            self.client.delete_blob(self.container, '/'.join([self.prefix, key]))
+            self.client.delete_blob(self.container, self._append_path_to_prefix(key))
         except AzureMissingResourceHttpError:
             raise KeyError('Blob %s not found' % key)
 
@@ -2034,53 +2038,62 @@ def keys(self):
         return list(self.__iter__())
 
     def __iter__(self):
-        for blob in self.client.list_blobs(self.container, self.prefix + '/'):
+        if self.prefix:
+            list_blobs_prefix = self.prefix + '/'
+        else:
+            list_blobs_prefix = None
+        for blob in self.client.list_blobs(self.container, list_blobs_prefix):
             yield self._strip_prefix_from_path(blob.name, self.prefix)
 
     def __len__(self):
         return len(self.keys())
 
     def __contains__(self, key):
-        blob_name = '/'.join([self.prefix, key])
+        blob_name = self._append_path_to_prefix(key)
         if self.client.exists(self.container, blob_name):
             return True
         else:
             return False
 
     def listdir(self, path=None):
-        store_path = normalize_storage_path(path)
-        # prefix is normalized to not have a trailing slash
-        dir_path = self.prefix
-        if store_path:
-            dir_path = dir_path + '/' + store_path
-        dir_path += '/'
+        from azure.storage.blob import Blob
+        dir_path = normalize_storage_path(self._append_path_to_prefix(path))
+        if dir_path:
+            dir_path += '/'
         items = list()
         for blob in self.client.list_blobs(self.container, prefix=dir_path, delimiter='/'):
-            if '/' in blob.name[len(dir_path):]:
+            if type(blob) == Blob:
+                items.append(self._strip_prefix_from_path(blob.name, dir_path))
+            else:
                 items.append(self._strip_prefix_from_path(
                     blob.name[:blob.name.find('/', len(dir_path))], dir_path))
-            else:
-                items.append(self._strip_prefix_from_path(blob.name, dir_path))
         return items
 
     def rmdir(self, path=None):
-        dir_path = normalize_storage_path(self._append_path_to_prefix(path, self.prefix)) + '/'
+        dir_path = normalize_storage_path(self._append_path_to_prefix(path))
+        if dir_path:
+            dir_path += '/'
         for blob in self.client.list_blobs(self.container, prefix=dir_path):
             self.client.delete_blob(self.container, blob.name)
 
     def getsize(self, path=None):
+        from azure.storage.blob import Blob
         store_path = normalize_storage_path(path)
         fs_path = self.prefix
         if store_path:
-            fs_path = self._append_path_to_prefix(store_path, self.prefix)
+            fs_path = self._append_path_to_prefix(store_path)
         if self.client.exists(self.container, fs_path):
             return self.client.get_blob_properties(self.container,
                                                    fs_path).properties.content_length
         else:
             size = 0
-            for blob in self.client.list_blobs(self.container, prefix=fs_path + '/',
+            if fs_path == '':
+                fs_path = None
+            else:
+                fs_path += '/'
+            for blob in self.client.list_blobs(self.container, prefix=fs_path,
                                                delimiter='/'):
-                if '/' not in blob.name[len(fs_path + '/'):]:
+                if type(blob) == Blob:
                     size += blob.properties.content_length
             return size
 

zarr/tests/test_core.py

@@ -1404,8 +1404,8 @@ def absstore():
         blob_client = asb.BlockBlobService(is_emulated=True)
         blob_client.delete_container('test')
         blob_client.create_container('test')
-        store = ABSStore(container='test', prefix='zarrtesting/', account_name='foo',
-                         account_key='bar', blob_service_kwargs={'is_emulated': True})
+        store = ABSStore(container='test', account_name='foo', account_key='bar',
+                         blob_service_kwargs={'is_emulated': True})
         store.rmdir()
         return store
 

zarr/tests/test_hierarchy.py

@@ -894,8 +894,8 @@ def create_store():
         blob_client = asb.BlockBlobService(is_emulated=True)
         blob_client.delete_container('test')
         blob_client.create_container('test')
-        store = ABSStore(container='test', prefix='zarrtesting/', account_name='foo',
-                         account_key='bar', blob_service_kwargs={'is_emulated': True})
+        store = ABSStore(container='test', account_name='foo', account_key='bar',
+                         blob_service_kwargs={'is_emulated': True})
         store.rmdir()
         return store, None
 

zarr/tests/test_storage.py

@@ -1473,16 +1473,41 @@ def test_format_compatibility():
 @skip_test_env_var("ZARR_TEST_ABS")
 class TestABSStore(StoreTests, unittest.TestCase):
 
-    def create_store(self):
+    def create_store(self, prefix=None):
         asb = pytest.importorskip("azure.storage.blob")
         blob_client = asb.BlockBlobService(is_emulated=True)
         blob_client.delete_container('test')
         blob_client.create_container('test')
-        store = ABSStore(container='test', prefix='zarrtesting/', account_name='foo',
+        store = ABSStore(container='test', prefix=prefix, account_name='foo',
                          account_key='bar', blob_service_kwargs={'is_emulated': True})
         store.rmdir()
         return store
 
+    def test_iterators_with_prefix(self):
+        for prefix in ['test_prefix', '/test_prefix', 'test_prefix/', 'test/prefix', '', None]:
+            store = self.create_store(prefix=prefix)
+
+            # test iterator methods on empty store
+            assert 0 == len(store)
+            assert set() == set(store)
+            assert set() == set(store.keys())
+            assert set() == set(store.values())
+            assert set() == set(store.items())
+
+            # setup some values
+            store['a'] = b'aaa'
+            store['b'] = b'bbb'
+            store['c/d'] = b'ddd'
+            store['c/e/f'] = b'fff'
+
+            # test iterators on store with data
+            assert 4 == len(store)
+            assert {'a', 'b', 'c/d', 'c/e/f'} == set(store)
+            assert {'a', 'b', 'c/d', 'c/e/f'} == set(store.keys())
+            assert {b'aaa', b'bbb', b'ddd', b'fff'} == set(store.values())
+            assert ({('a', b'aaa'), ('b', b'bbb'), ('c/d', b'ddd'), ('c/e/f', b'fff')} ==
+                    set(store.items()))
+
 
 class TestConsolidatedMetadataStore(unittest.TestCase):