add method to check if objects exists for azure and s3

pyinfra/storage/adapters/azure.py

@@ -37,6 +37,11 @@ class AzureStorageAdapter(object):
         blob_client = container_client.get_blob_client(object_name)
         blob_client.upload_blob(data, overwrite=True)
 
+    def exists(self, bucket_name, object_name):
+        container_client = self.__provide_container_client(bucket_name)
+        blob_client = container_client.get_blob_client(object_name)
+        return blob_client.exists()
+
     @retry(tries=3, delay=5, jitter=(1, 3))
     def get_object(self, bucket_name, object_name):
         logger.debug(f"Downloading '{object_name}'...")

pyinfra/storage/adapters/s3.py

@@ -42,6 +42,13 @@ class S3StorageAdapter(object):
         data = io.BytesIO(data)
         self._client.put_object(bucket_name, object_name, data, length=data.getbuffer().nbytes)
 
+    def exists(self, bucket_name, object_name):
+        try:
+            self._client.stat_object(bucket_name, object_name)
+            return True
+        except Exception:  # TODO: specify exception
+            return False
+
     @retry(tries=3, delay=5, jitter=(1, 3))
     def get_object(self, bucket_name, object_name):
         logger.debug(f"Downloading '{object_name}'...")