MemoryBackend: init

nixops/plugin.py

@@ -2,8 +2,9 @@
 import nixops.plugins
 from nixops.storage import StorageBackend
 from nixops.storage.legacy import LegacyBackend
+from nixops.storage.memory import MemoryBackend
 
 
 @nixops.plugins.hookimpl
 def register_backends() -> Dict[str, Type[StorageBackend]]:
- return {"legacy": LegacyBackend}
+ return {"legacy": LegacyBackend, "memory": MemoryBackend}

nixops/storage/memory.py

@@ -0,0 +1,27 @@
+import nixops.statefile
+from nixops.storage import StorageArgDescriptions, StorageArgValues
+
+
+class MemoryBackend:
+ @staticmethod
+ def arguments() -> StorageArgDescriptions:
+ raise NotImplementedError
+
+ def __init__(self, args: StorageArgValues) -> None:
+ pass
+
+ # fetchToFile: acquire a lock and download the state file to
+ # the local disk. Note: no arguments will be passed over kwargs.
+ # Making it part of the type definition allows adding new
+ # arguments later.
+ def fetchToFile(self, path: str, **kwargs) -> None:
+ pass
+
+ def onOpen(self, sf: nixops.statefile.StateFile, **kwargs) -> None:
+ sf.create_deployment()
+
+ # uploadFromFile: upload the new state file and release any locks
+ # Note: no arguments will be passed over kwargs. Making it part of
+ # the type definition allows adding new arguments later.
+ def uploadFromFile(self, path: str, **kwargs) -> None:
+ pass