Workaround for missing has_key implementation

.travis/start_minio.sh

@@ -10,5 +10,6 @@ export MINIO_ACCESS_KEY=minio
 export MINIO_SECRET_KEY=miniostorage
 
 mkdir -p ~/s3
-~/minio version
+
+~/minio --version
 ~/minio server ~/s3 &

simplekv/net/_azurestore_new.py

@@ -4,6 +4,7 @@
 import hashlib
 import io
 from contextlib import contextmanager
+from azure.core.exceptions import ResourceNotFoundError
 
 from .._compat import binary_type
 from .. import KeyValueStore
@@ -95,7 +96,14 @@ def _get(self, key):
             return downloader.readall()
 
     def _has_key(self, key):
-        return self.blob_container_client.exists(key)
+        # https://github.com/Azure/azure-sdk-for-python/issues/9507
+        blob_client = self.blob_container_client.get_blob_client(key)
+        try:
+            # One of the very few methods which do not mutate state
+            blob_client.get_blob_properties()
+            return True
+        except ResourceNotFoundError:
+            return False
 
     def iter_keys(self, prefix=None):
         blobs = self.blob_container_client.list_blobs(name_starts_with=prefix)

tests/test_azure_store.py

@@ -66,6 +66,11 @@ def store(self):
                                   public=False)
         _delete_container(conn_string, container)
 
+    def test_exists(self, store):
+        assert "key" not in store
+        store.put("key", b"value")
+        assert "key" in store
+
 
 class TestExtendedKeysAzureStorage(TestAzureStorage, ExtendedKeyspaceTests):
     @pytest.fixture