refactor(backups): fix typing errors

selfprivacy_api/backup/__init__.py

@@ -1,3 +1,4 @@
+from operator import add
 from typing import List, Optional
 from datetime import datetime, timedelta
 from os import statvfs
@@ -9,7 +10,9 @@ from selfprivacy_api.utils import ReadUserData, WriteUserData
 from selfprivacy_api.services import get_service_by_id
 from selfprivacy_api.services.service import Service
 
-from selfprivacy_api.graphql.queries.providers import BackupProvider
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 
 from selfprivacy_api.backup.providers.provider import AbstractBackupProvider
 from selfprivacy_api.backup.providers import get_provider
@@ -33,12 +36,15 @@ DEFAULT_JSON_PROVIDER = {
 class Backups:
     """A singleton controller for backups"""
 
-    provider: AbstractBackupProvider
-
     @staticmethod
     def set_localfile_repo(file_path: str):
-        ProviderClass = get_provider(BackupProvider.FILE)
+        ProviderClass = get_provider(BackupProviderEnum.FILE)
-        provider = ProviderClass(login="", key="", location=file_path, repo_id="")
+        provider = ProviderClass(
+            login="",
+            key="",
+            location=file_path,
+            repo_id="",
+        )
         Storage.store_provider(provider)
 
     @staticmethod
@@ -67,7 +73,14 @@ class Backups:
     @staticmethod
     def _service_ids_to_back_up(time: datetime) -> List[str]:
         services = Storage.services_with_autobackup()
-        return [id for id in services if Backups.is_time_to_backup_service(id, time)]
+        return [
+            id
+            for id in services
+            if Backups.is_time_to_backup_service(
+                id,
+                time,
+            )
+        ]
 
     @staticmethod
     def services_to_back_up(time: datetime) -> List[Service]:
@@ -75,14 +88,17 @@ class Backups:
         for id in Backups._service_ids_to_back_up(time):
             service = get_service_by_id(id)
             if service is None:
-                raise ValueError("Cannot look up a service scheduled for backup!")
+                raise ValueError(
+                    "Cannot look up a service scheduled for backup!",
+                )
             result.append(service)
         return result
 
     @staticmethod
     def is_time_to_backup(time: datetime) -> bool:
         """
-        Intended as a time validator for huey cron scheduler of automatic backups
+        Intended as a time validator for huey cron scheduler
+        of automatic backups
         """
 
         return Backups._service_ids_to_back_up(time) != []
@@ -97,7 +113,8 @@ class Backups:
 
         last_backup = Storage.get_last_backup_time(service_id)
         if last_backup is None:
-            return True  # queue a backup immediately if there are no previous backups
+            # queue a backup immediately if there are no previous backups
+            return True
 
         if time > last_backup + timedelta(minutes=period):
             return True
@@ -121,7 +138,8 @@ class Backups:
     def set_autobackup_period_minutes(minutes: int):
         """
         0 and negative numbers are equivalent to disable.
-        Setting to a positive number may result in a backup very soon if some services are not backed up.
+        Setting to a positive number may result in a backup very soon
+        if some services are not backed up.
         """
         if minutes <= 0:
             Backups.disable_all_autobackup()
@@ -130,7 +148,10 @@ class Backups:
 
     @staticmethod
     def disable_all_autobackup():
-        """disables all automatic backing up, but does not change per-service settings"""
+        """
+        Disables all automatic backing up,
+        but does not change per-service settings
+        """
         Storage.delete_backup_period()
 
     @staticmethod
@@ -138,17 +159,38 @@ class Backups:
         return Backups.lookup_provider()
 
     @staticmethod
-    def set_provider(kind: str, login: str, key: str, location: str, repo_id: str = ""):
+    def set_provider(
-        provider = Backups.construct_provider(kind, login, key, location, repo_id)
+        kind: BackupProviderEnum,
+        login: str,
+        key: str,
+        location: str,
+        repo_id: str = "",
+    ):
+        provider = Backups.construct_provider(
+            kind,
+            login,
+            key,
+            location,
+            repo_id,
+        )
         Storage.store_provider(provider)
 
     @staticmethod
     def construct_provider(
-        kind: str, login: str, key: str, location: str, repo_id: str = ""
+        kind: BackupProviderEnum,
-    ):
+        login: str,
-        provider_class = get_provider(BackupProvider[kind])
+        key: str,
+        location: str,
+        repo_id: str = "",
+    ) -> AbstractBackupProvider:
+        provider_class = get_provider(kind)
 
-        return provider_class(login=login, key=key, location=location, repo_id=repo_id)
+        return provider_class(
+            login=login,
+            key=key,
+            location=location,
+            repo_id=repo_id,
+        )
 
     @staticmethod
     def reset(reset_json=True):
@@ -156,7 +198,8 @@ class Backups:
         if reset_json:
             try:
                 Backups.reset_provider_json()
-            except FileNotFoundError:  # if there is no userdata file, we do not need to reset it
+            except FileNotFoundError:
+                # if there is no userdata file, we do not need to reset it
                 pass
 
     @staticmethod
@@ -175,7 +218,7 @@ class Backups:
             return json_provider
 
         none_provider = Backups.construct_provider(
-            "NONE", login="", key="", location=""
+            BackupProviderEnum.NONE, login="", key="", location=""
         )
         Storage.store_provider(none_provider)
         return none_provider
@@ -200,15 +243,18 @@ class Backups:
 
             if provider_dict == DEFAULT_JSON_PROVIDER:
                 return None
-
+            try:
                 return Backups.construct_provider(
-                kind=provider_dict["provider"],
+                    kind=BackupProviderEnum[provider_dict["provider"]],
                     login=provider_dict["accountId"],
                     key=provider_dict["accountKey"],
                     location=provider_dict["bucket"],
                 )
+            except KeyError:
+                return None
 
-    def reset_provider_json() -> AbstractBackupProvider:
+    @staticmethod
+    def reset_provider_json() -> None:
         with WriteUserData() as user_data:
             if "backblaze" in user_data.keys():
                 del user_data["backblaze"]
@@ -216,12 +262,12 @@ class Backups:
             user_data["backup"] = DEFAULT_JSON_PROVIDER
 
     @staticmethod
-    def load_provider_redis() -> AbstractBackupProvider:
+    def load_provider_redis() -> Optional[AbstractBackupProvider]:
         provider_model = Storage.load_provider()
         if provider_model is None:
             return None
         return Backups.construct_provider(
-            provider_model.kind,
+            BackupProviderEnum[provider_model.kind],
             provider_model.login,
             provider_model.key,
             provider_model.location,
@@ -232,7 +278,7 @@ class Backups:
     def back_up(service: Service):
         """The top-level function to back up a service"""
         folders = service.get_folders()
-        repo_name = service.get_id()
+        tag = service.get_id()
 
         job = get_backup_job(service)
         if job is None:
@@ -241,8 +287,11 @@ class Backups:
 
         try:
             service.pre_backup()
-            snapshot = Backups.provider().backuper.start_backup(folders, repo_name)
+            snapshot = Backups.provider().backuper.start_backup(
-            Backups._store_last_snapshot(repo_name, snapshot)
+                folders,
+                tag,
+            )
+            Backups._store_last_snapshot(tag, snapshot)
             service.post_restore()
         except Exception as e:
             Jobs.update(job, status=JobStatus.ERROR)
@@ -252,10 +301,7 @@ class Backups:
         return snapshot
 
     @staticmethod
-    def init_repo(service: Optional[Service] = None):
+    def init_repo():
-        if service is not None:
-            repo_name = service.get_id()
-
         Backups.provider().backuper.init()
         Storage.mark_as_init()
 
@@ -274,7 +320,13 @@ class Backups:
     @staticmethod
     def get_snapshots(service: Service) -> List[Snapshot]:
         snapshots = Backups.get_all_snapshots()
-        return [snap for snap in snapshots if snap.service_name == service.get_id()]
+        service_id = service.get_id()
+        return list(
+            filter(
+                lambda snap: snap.service_name == service_id,
+                snapshots,
+            )
+        )
 
     @staticmethod
     def get_all_snapshots() -> List[Snapshot]:
@@ -314,10 +366,12 @@ class Backups:
     # to be deprecated/internalized in favor of restore_snapshot()
     @staticmethod
     def restore_service_from_snapshot(service: Service, snapshot_id: str):
-        repo_name = service.get_id()
         folders = service.get_folders()
 
-        Backups.provider().backuper.restore_from_backup(repo_name, snapshot_id, folders)
+        Backups.provider().backuper.restore_from_backup(
+            snapshot_id,
+            folders,
+        )
 
     @staticmethod
     def assert_restorable(snapshot: Snapshot):
@@ -327,45 +381,58 @@ class Backups:
                 f"snapshot has a nonexistent service: {snapshot.service_name}"
             )
 
-        needed_space = Backups.snapshot_restored_size(snapshot)
+        needed_space = Backups.service_snapshot_size(snapshot.id)
         available_space = Backups.space_usable_for_service(service)
         if needed_space > available_space:
             raise ValueError(
-                f"we only have {available_space} bytes but snapshot needs{ needed_space}"
+                f"we only have {available_space} bytes "
+                f"but snapshot needs {needed_space}"
             )
 
     @staticmethod
     def restore_snapshot(snapshot: Snapshot):
         service = get_service_by_id(snapshot.service_name)
 
+        if service is None:
+            raise ValueError(
+                f"snapshot has a nonexistent service: {snapshot.service_name}"
+            )
+
         job = get_restore_job(service)
         if job is None:
             job = add_restore_job(snapshot)
 
-        Jobs.update(job, status=JobStatus.RUNNING)
+        Jobs.update(
+            job,
+            status=JobStatus.RUNNING,
+        )
         try:
             Backups.assert_restorable(snapshot)
-            Backups.restore_service_from_snapshot(service, snapshot.id)
+            Backups.restore_service_from_snapshot(
+                service,
+                snapshot.id,
+            )
             service.post_restore()
         except Exception as e:
-            Jobs.update(job, status=JobStatus.ERROR)
+            Jobs.update(
+                job,
+                status=JobStatus.ERROR,
+            )
             raise e
 
-        Jobs.update(job, status=JobStatus.FINISHED)
+        Jobs.update(
-
+            job,
-    @staticmethod
+            status=JobStatus.FINISHED,
-    def service_snapshot_size(service: Service, snapshot_id: str) -> float:
-        repo_name = service.get_id()
-        return Backups.provider().backuper.restored_size(repo_name, snapshot_id)
-
-    @staticmethod
-    def snapshot_restored_size(snapshot: Snapshot) -> float:
-        return Backups.service_snapshot_size(
-            get_service_by_id(snapshot.service_name), snapshot.id
         )
 
     @staticmethod
-    def space_usable_for_service(service: Service) -> bool:
+    def service_snapshot_size(snapshot_id: str) -> int:
+        return Backups.provider().backuper.restored_size(
+            snapshot_id,
+        )
+
+    @staticmethod
+    def space_usable_for_service(service: Service) -> int:
         folders = service.get_folders()
         if folders == []:
             raise ValueError("unallocated service", service.get_id())

selfprivacy_api/backup/backuppers/__init__.py

@@ -26,14 +26,14 @@ class AbstractBackuper(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def init(self, repo_name):
+    def init(self):
         raise NotImplementedError
 
     @abstractmethod
-    def restore_from_backup(self, repo_name: str, snapshot_id: str, folders: List[str]):
+    def restore_from_backup(self, snapshot_id: str, folders: List[str]):
         """Restore a target folder using a snapshot"""
         raise NotImplementedError
 
     @abstractmethod
-    def restored_size(self, repo_name, snapshot_id) -> float:
+    def restored_size(self, snapshot_id: str) -> int:
         raise NotImplementedError

selfprivacy_api/backup/backuppers/none_backupper.py

@@ -18,12 +18,12 @@ class NoneBackupper(AbstractBackuper):
         """Get all snapshots from the repo"""
         return []
 
-    def init(self, repo_name):
+    def init(self):
         raise NotImplementedError
 
-    def restore_from_backup(self, repo_name: str, snapshot_id: str, folders: List[str]):
+    def restore_from_backup(self, snapshot_id: str, folders: List[str]):
         """Restore a target folder using a snapshot"""
         raise NotImplementedError
 
-    def restored_size(self, repo_name, snapshot_id) -> float:
+    def restored_size(self, snapshot_id: str) -> int:
         raise NotImplementedError

selfprivacy_api/backup/backuppers/restic_backupper.py

@@ -50,7 +50,7 @@ class ResticBackuper(AbstractBackuper):
     def _password_command(self):
         return f"echo {LocalBackupSecret.get()}"
 
-    def restic_command(self, *args, branch_name: str = ""):
+    def restic_command(self, *args, tag: str = ""):
         command = [
             "restic",
             "-o",
@@ -60,11 +60,11 @@ class ResticBackuper(AbstractBackuper):
             "--password-command",
             self._password_command(),
         ]
-        if branch_name != "":
+        if tag != "":
             command.extend(
                 [
                     "--tag",
-                    branch_name,
+                    tag,
                 ]
             )
         if args != []:
@@ -92,10 +92,10 @@ class ResticBackuper(AbstractBackuper):
             universal_newlines=True,
         ) as handle:
             for line in iter(handle.stdout.readline, ""):
-                if not "NOTICE:" in line:
+                if "NOTICE:" not in line:
                     yield line
 
-    def start_backup(self, folders: List[str], repo_name: str):
+    def start_backup(self, folders: List[str], tag: str):
         """
         Start backup with restic
         """
@@ -107,16 +107,16 @@ class ResticBackuper(AbstractBackuper):
             "backup",
             "--json",
             folders,
-            branch_name=repo_name,
+            tag=tag,
         )
 
         messages = []
-        job = get_backup_job(get_service_by_id(repo_name))
+        job = get_backup_job(get_service_by_id(tag))
         try:
             for raw_message in ResticBackuper.output_yielder(backup_command):
                 message = self.parse_message(raw_message, job)
                 messages.append(message)
-            return ResticBackuper._snapshot_from_backup_messages(messages, repo_name)
+            return ResticBackuper._snapshot_from_backup_messages(messages, tag)
         except ValueError as e:
             raise ValueError("could not create a snapshot: ", messages) from e
 
@@ -128,7 +128,7 @@ class ResticBackuper(AbstractBackuper):
         raise ValueError("no summary message in restic json output")
 
     def parse_message(self, raw_message, job=None) -> object:
-        message = self.parse_json_output(raw_message)
+        message = ResticBackuper.parse_json_output(raw_message)
         if message["message_type"] == "status":
             if job is not None:  # only update status if we run under some job
                 Jobs.update(
@@ -168,12 +168,12 @@ class ResticBackuper(AbstractBackuper):
 
         with subprocess.Popen(command, stdout=subprocess.PIPE, shell=False) as handle:
             output = handle.communicate()[0].decode("utf-8")
-            if not self.has_json(output):
+            if not ResticBackuper.has_json(output):
                 return False
             # raise NotImplementedError("error(big): " + output)
             return True
 
-    def restored_size(self, repo_name, snapshot_id) -> float:
+    def restored_size(self, snapshot_id: str) -> int:
         """
         Size of a snapshot
         """
@@ -183,15 +183,19 @@ class ResticBackuper(AbstractBackuper):
             "--json",
         )
 
-        with subprocess.Popen(command, stdout=subprocess.PIPE, shell=False) as handle:
+        with subprocess.Popen(
+            command,
+            stdout=subprocess.PIPE,
+            shell=False,
+        ) as handle:
             output = handle.communicate()[0].decode("utf-8")
             try:
-                parsed_output = self.parse_json_output(output)
+                parsed_output = ResticBackuper.parse_json_output(output)
                 return parsed_output["total_size"]
             except ValueError as e:
                 raise ValueError("cannot restore a snapshot: " + output) from e
 
-    def restore_from_backup(self, repo_name, snapshot_id, folders):
+    def restore_from_backup(self, snapshot_id, folders):
         """
         Restore from backup with restic
         """
@@ -235,7 +239,7 @@ class ResticBackuper(AbstractBackuper):
         if "Is there a repository at the following location?" in output:
             raise ValueError("No repository! : " + output)
         try:
-            return self.parse_json_output(output)
+            return ResticBackuper.parse_json_output(output)
         except ValueError as e:
             raise ValueError("Cannot load snapshots: ") from e
 
@@ -252,8 +256,9 @@ class ResticBackuper(AbstractBackuper):
             snapshots.append(snapshot)
         return snapshots
 
-    def parse_json_output(self, output: str) -> object:
+    @staticmethod
-        starting_index = self.json_start(output)
+    def parse_json_output(output: str) -> object:
+        starting_index = ResticBackuper.json_start(output)
 
         if starting_index == -1:
             raise ValueError("There is no json in the restic output : " + output)
@@ -273,7 +278,8 @@ class ResticBackuper(AbstractBackuper):
             result_array.append(json.loads(message))
         return result_array
 
-    def json_start(self, output: str) -> int:
+    @staticmethod
+    def json_start(output: str) -> int:
         indices = [
             output.find("["),
             output.find("{"),
@@ -284,7 +290,8 @@ class ResticBackuper(AbstractBackuper):
             return -1
         return min(indices)
 
-    def has_json(self, output: str) -> bool:
+    @staticmethod
-        if self.json_start(output) == -1:
+    def has_json(output: str) -> bool:
+        if ResticBackuper.json_start(output) == -1:
             return False
         return True

selfprivacy_api/backup/jobs.py

@@ -51,6 +51,8 @@ def add_backup_job(service: Service) -> Job:
 
 def add_restore_job(snapshot: Snapshot) -> Job:
     service = get_service_by_id(snapshot.service_name)
+    if service is None:
+        raise ValueError(f"no such service: {snapshot.service_name}")
     if is_something_queued_for(service):
         message = (
             f"Cannot start a restore of {service.get_id()}, another operation is queued: "

selfprivacy_api/backup/providers/__init__.py

@@ -1,23 +1,29 @@
-from selfprivacy_api.graphql.queries.providers import BackupProvider
+from typing import Type
+
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 from selfprivacy_api.backup.providers.provider import AbstractBackupProvider
 
 from selfprivacy_api.backup.providers.backblaze import Backblaze
 from selfprivacy_api.backup.providers.memory import InMemoryBackup
 from selfprivacy_api.backup.providers.local_file import LocalFileBackup
+from selfprivacy_api.backup.providers.none import NoBackups
 
-PROVIDER_MAPPING = {
+PROVIDER_MAPPING: dict[BackupProviderEnum, Type[AbstractBackupProvider]] = {
-    BackupProvider.BACKBLAZE: Backblaze,
+    BackupProviderEnum.BACKBLAZE: Backblaze,
-    BackupProvider.MEMORY: InMemoryBackup,
+    BackupProviderEnum.MEMORY: InMemoryBackup,
-    BackupProvider.FILE: LocalFileBackup,
+    BackupProviderEnum.FILE: LocalFileBackup,
-    BackupProvider.NONE: AbstractBackupProvider,
+    BackupProviderEnum.NONE: NoBackups,
 }
 
 
-def get_provider(provider_type: BackupProvider) -> AbstractBackupProvider:
+def get_provider(
+    provider_type: BackupProviderEnum,
+) -> Type[AbstractBackupProvider]:
     return PROVIDER_MAPPING[provider_type]
 
 
 def get_kind(provider: AbstractBackupProvider) -> str:
-    for key, value in PROVIDER_MAPPING.items():
+    """Get the kind of the provider in the form of a string"""
-        if isinstance(provider, value):
+    return provider.name.value
-            return key.value

selfprivacy_api/backup/providers/backblaze.py

@@ -1,8 +1,13 @@
 from .provider import AbstractBackupProvider
 from selfprivacy_api.backup.backuppers.restic_backupper import ResticBackuper
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 
 
 class Backblaze(AbstractBackupProvider):
-    backuper = ResticBackuper("--b2-account", "--b2-key", ":b2:")
+    @property
+    def backuper(self):
+        return ResticBackuper("--b2-account", "--b2-key", ":b2:")
 
-    name = "BACKBLAZE"
+    name = BackupProviderEnum.BACKBLAZE

selfprivacy_api/backup/providers/local_file.py

@@ -1,7 +1,13 @@
 from .provider import AbstractBackupProvider
 from selfprivacy_api.backup.backuppers.restic_backupper import ResticBackuper
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 
 
 class LocalFileBackup(AbstractBackupProvider):
-    backuper = ResticBackuper("", "", ":local:")
+    @property
-    name = "FILE"
+    def backuper(self):
+        return ResticBackuper("", "", ":local:")
+
+    name = BackupProviderEnum.FILE

selfprivacy_api/backup/providers/memory.py

@@ -1,8 +1,13 @@
 from .provider import AbstractBackupProvider
 from selfprivacy_api.backup.backuppers.restic_backupper import ResticBackuper
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 
 
 class InMemoryBackup(AbstractBackupProvider):
-    backuper = ResticBackuper("", "", ":memory:")
+    @property
+    def backuper(self):
+        return ResticBackuper("", "", ":memory:")
 
-    name = "MEMORY"
+    name = BackupProviderEnum.MEMORY

selfprivacy_api/backup/providers/none.py

@@ -0,0 +1,13 @@
+from .provider import AbstractBackupProvider
+from selfprivacy_api.backup.backuppers.none_backupper import NoneBackupper
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
+
+
+class NoBackups(AbstractBackupProvider):
+    @property
+    def backuper(self):
+        return NoneBackupper()
+
+    name = BackupProviderEnum.NONE

selfprivacy_api/backup/providers/provider.py

@@ -1,19 +1,22 @@
 """
 An abstract class for BackBlaze, S3 etc.
-It assumes that while some providers are supported via restic/rclone, others may
+It assumes that while some providers are supported via restic/rclone, others
-require different backends
+may require different backends
 """
-from abc import ABC
+from abc import ABC, abstractmethod
 from selfprivacy_api.backup.backuppers import AbstractBackuper
-from selfprivacy_api.backup.backuppers.none_backupper import NoneBackupper
+from selfprivacy_api.graphql.queries.providers import (
+    BackupProvider as BackupProviderEnum,
+)
 
 
 class AbstractBackupProvider(ABC):
     @property
+    @abstractmethod
     def backuper(self) -> AbstractBackuper:
-        return NoneBackupper()
+        raise NotImplementedError
 
-    name = "NONE"
+    name: BackupProviderEnum
 
     def __init__(self, login="", key="", location="", repo_id=""):
         self.backuper.set_creds(login, key, location)

selfprivacy_api/backup/storage.py

@@ -5,7 +5,10 @@ from selfprivacy_api.models.backup.snapshot import Snapshot
 from selfprivacy_api.models.backup.provider import BackupProviderModel
 
 from selfprivacy_api.utils.redis_pool import RedisPool
-from selfprivacy_api.utils.redis_model_storage import store_model_as_hash, hash_as_model
+from selfprivacy_api.utils.redis_model_storage import (
+    store_model_as_hash,
+    hash_as_model,
+)
 
 
 from selfprivacy_api.services.service import Service
@@ -153,8 +156,12 @@ class Storage:
         )
 
     @staticmethod
-    def load_provider() -> BackupProviderModel:
+    def load_provider() -> Optional[BackupProviderModel]:
-        provider_model = hash_as_model(redis, REDIS_PROVIDER_KEY, BackupProviderModel)
+        provider_model = hash_as_model(
+            redis,
+            REDIS_PROVIDER_KEY,
+            BackupProviderModel,
+        )
         return provider_model
 
     @staticmethod

selfprivacy_api/graphql/mutations/backup_mutations.py

@@ -49,7 +49,7 @@ class BackupMutations:
     ) -> GenericBackupConfigReturn:
         """Initialize a new repository"""
         Backups.set_provider(
-            kind=repository.provider.value,
+            kind=repository.provider,
             login=repository.login,
             key=repository.password,
             location=repository.location_name,
@@ -57,7 +57,10 @@ class BackupMutations:
         )
         Backups.init_repo()
         return GenericBackupConfigReturn(
-            success=True, message="", code="200", configuration=Backup().configuration()
+            success=True,
+            message="",
+            code="200",
+            configuration=Backup().configuration(),
         )
 
     @strawberry.mutation(permission_classes=[IsAuthenticated])
@@ -65,7 +68,10 @@ class BackupMutations:
         """Remove repository"""
         Backups.reset()
         return GenericBackupConfigReturn(
-            success=True, message="", code="200", configuration=Backup().configuration()
+            success=True,
+            message="",
+            code="200",
+            configuration=Backup().configuration(),
         )
 
     @strawberry.mutation(permission_classes=[IsAuthenticated])
@@ -79,7 +85,10 @@ class BackupMutations:
             Backups.set_autobackup_period_minutes(0)
 
         return GenericBackupConfigReturn(
-            success=True, message="", code="200", configuration=Backup().configuration()
+            success=True,
+            message="",
+            code="200",
+            configuration=Backup().configuration(),
         )
 
     @strawberry.mutation(permission_classes=[IsAuthenticated])
@@ -97,36 +106,52 @@ class BackupMutations:
 
         job = add_backup_job(service)
         start_backup(service)
-        job = job_to_api_job(job)
 
         return GenericJobMutationReturn(
             success=True,
             code=200,
             message="Backup job queued",
-            job=job,
+            job=job_to_api_job(job),
         )
 
     @strawberry.mutation(permission_classes=[IsAuthenticated])
     def restore_backup(self, snapshot_id: str) -> GenericJobMutationReturn:
         """Restore backup"""
         snap = Backups.get_snapshot_by_id(snapshot_id)
-        service = get_service_by_id(snap.service_name)
         if snap is None:
             return GenericJobMutationReturn(
                 success=False,
-                code=400,
+                code=404,
                 message=f"No such snapshot: {snapshot_id}",
                 job=None,
             )
 
+        service = get_service_by_id(snap.service_name)
+        if service is None:
+            return GenericJobMutationReturn(
+                success=False,
+                code=404,
+                message=f"nonexistent service: {snap.service_name}",
+                job=None,
+            )
+
+        try:
             job = add_restore_job(snap)
+        except ValueError as e:
+            return GenericJobMutationReturn(
+                success=False,
+                code=400,
+                message=str(e),
+                job=None,
+            )
+
         restore_snapshot(snap)
 
         return GenericJobMutationReturn(
             success=True,
             code=200,
             message="restore job created",
-            job=job,
+            job=job_to_api_job(job),
         )
 
     @strawberry.mutation(permission_classes=[IsAuthenticated])

tests/test_graphql/test_backup.py

@@ -73,7 +73,7 @@ def dummy_service(tmpdir, backups, raw_dummy_service):
     assert not path.exists(repo_path)
     # assert not repo_path
 
-    Backups.init_repo(service)
+    Backups.init_repo()
 
     # register our service
     services.services.append(service)
@@ -232,7 +232,7 @@ def test_restore(backups, dummy_service):
 def test_sizing(backups, dummy_service):
     Backups.back_up(dummy_service)
     snap = Backups.get_snapshots(dummy_service)[0]
-    size = Backups.service_snapshot_size(dummy_service, snap.id)
+    size = Backups.service_snapshot_size(snap.id)
     assert size is not None
     assert size > 0