From b969715be4162a425451420cc69d3af92e23ff02 Mon Sep 17 00:00:00 2001
From: fjetter <fjetter@users.noreply.github.com>
Date: Wed, 22 Jan 2020 16:58:26 +0100
Subject: [PATCH] Workaround for missing has_key implementation

---
 .travis/start_minio.sh          |  3 ++-
 simplekv/net/_azurestore_new.py | 10 +++++++++-
 tests/test_azure_store.py       |  5 +++++
 3 files changed, 16 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 .travis/start_minio.sh

diff --git a/.travis/start_minio.sh b/.travis/start_minio.sh
old mode 100644
new mode 100755
index 7cca504d..9e9dcfe7
--- a/.travis/start_minio.sh
+++ b/.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 &
diff --git a/simplekv/net/_azurestore_new.py b/simplekv/net/_azurestore_new.py
index ac591a2e..a3752267 100644
--- a/simplekv/net/_azurestore_new.py
+++ b/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)
diff --git a/tests/test_azure_store.py b/tests/test_azure_store.py
index af9f4da7..81112003 100644
--- a/tests/test_azure_store.py
+++ b/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