Support cloud storage

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Support of context images for 2D image tasks (<https://github.com/openvinotoolkit/cvat/pull/3122>)
+- Support of cloud storage without copying data into CVAT: server part (<https://github.com/openvinotoolkit/cvat/pull/2620>)
 - Filter `is_active` for user list (<https://github.com/openvinotoolkit/cvat/pull/3235>)
 - Ability to export/import tasks (<https://github.com/openvinotoolkit/cvat/pull/3056>)
 

cvat/apps/authentication/auth.py

@@ -159,6 +159,10 @@ def is_comment_author(db_user, db_comment):
     has_rights = (db_comment.author == db_user)
     return has_rights
 
+@rules.predicate
+def is_cloud_storage_owner(db_user, db_storage):
+    return db_storage.owner == db_user
+
 # AUTH PERMISSIONS RULES
 rules.add_perm('engine.role.user', has_user_role)
 rules.add_perm('engine.role.admin', has_admin_role)
@@ -190,6 +194,9 @@ def is_comment_author(db_user, db_comment):
 rules.add_perm('engine.comment.change', has_admin_role | is_comment_author)
 
 
+rules.add_perm('engine.cloudstorage.create', has_admin_role | has_user_role)
+rules.add_perm('engine.cloudstorage.change', has_admin_role | is_cloud_storage_owner)
+
 class AdminRolePermission(BasePermission):
     # pylint: disable=no-self-use
     def has_permission(self, request, view):
@@ -329,3 +336,21 @@ class CommentChangePermission(BasePermission):
     def has_object_permission(self, request, view, obj):
         return request.user.has_perm('engine.comment.change', obj)
 
+class CloudStorageAccessPermission(BasePermission):
+    # pylint: disable=no-self-use
+    def has_object_permission(self, request, view, obj):
+        return request.user.has_perm("engine.cloudstorage.change", obj)
+
+class CloudStorageChangePermission(BasePermission):
+    # pylint: disable=no-self-use
+    def has_object_permission(self, request, view, obj):
+        return request.user.has_perm("engine.cloudstorage.change", obj)
+
+class CloudStorageGetQuerySetMixin(object):
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        user = self.request.user
+        if has_admin_role(user) or self.detail:
+            return queryset
+        else:
+            return queryset.filter(owner=user)

cvat/apps/engine/admin.py

@@ -4,14 +4,14 @@
 # SPDX-License-Identifier: MIT
 
 from django.contrib import admin
-from .models import Task, Segment, Job, Label, AttributeSpec, Project
+from .models import Task, Segment, Job, Label, AttributeSpec, Project, CloudStorage
 
 class JobInline(admin.TabularInline):
     model = Job
     can_delete = False
 
     # Don't show extra lines to add an object
-    def has_add_permission(self, request, object=None):
+    def has_add_permission(self, request, obj):
         return False
 
 class SegmentInline(admin.TabularInline):
@@ -21,7 +21,7 @@ class SegmentInline(admin.TabularInline):
     can_delete = False
 
     # Don't show extra lines to add an object
-    def has_add_permission(self, request, object=None):
+    def has_add_permission(self, request, obj):
         return False
 
 
@@ -84,8 +84,20 @@ class TaskAdmin(admin.ModelAdmin):
     def has_add_permission(self, request):
         return False
 
+class CloudStorageAdmin(admin.ModelAdmin):
+    date_hierarchy = 'updated_date'
+    readonly_fields = ('created_date', 'updated_date', 'provider_type')
+    list_display = ('__str__', 'resource', 'owner', 'created_date', 'updated_date')
+    search_fields = ('provider_type', 'display_name', 'resource', 'owner__username', 'owner__first_name',
+        'owner__last_name', 'owner__email',)
+
+    empty_value_display = 'unknown'
+
+    def has_add_permission(self, request):
+        return False
 
 admin.site.register(Task, TaskAdmin)
 admin.site.register(Segment, SegmentAdmin)
 admin.site.register(Label, LabelAdmin)
 admin.site.register(Project, ProjectAdmin)
+admin.site.register(CloudStorage, CloudStorageAdmin)

cvat/apps/engine/cache.py

@@ -7,13 +7,16 @@
 
 from diskcache import Cache
 from django.conf import settings
+from tempfile import NamedTemporaryFile
 
+from cvat.apps.engine.log import slogger
 from cvat.apps.engine.media_extractors import (Mpeg4ChunkWriter,
     Mpeg4CompressedChunkWriter, ZipChunkWriter, ZipCompressedChunkWriter,
     ImageDatasetManifestReader, VideoDatasetManifestReader)
 from cvat.apps.engine.models import DataChoice, StorageChoice
 from cvat.apps.engine.models import DimensionType
-
+from cvat.apps.engine.cloud_provider import get_cloud_storage_instance, Credentials
+from cvat.apps.engine.utils import md5_hash
 class CacheInteraction:
     def __init__(self, dimension=DimensionType.DIM_2D):
         self._cache = Cache(settings.CACHE_ROOT)
@@ -49,10 +52,12 @@ def prepare_chunk_buff(self, db_data, quality, chunk_number):
         buff = BytesIO()
         upload_dir = {
                 StorageChoice.LOCAL: db_data.get_upload_dirname(),
-                StorageChoice.SHARE: settings.SHARE_ROOT
+                StorageChoice.SHARE: settings.SHARE_ROOT,
+                StorageChoice.CLOUD_STORAGE: db_data.get_upload_dirname(),
             }[db_data.storage]
         if hasattr(db_data, 'video'):
             source_path = os.path.join(upload_dir, db_data.video.path)
+
             reader = VideoDatasetManifestReader(manifest_path=db_data.get_manifest_path(),
                 source_path=source_path, chunk_number=chunk_number,
                 chunk_size=db_data.chunk_size, start=db_data.start_frame,
@@ -64,12 +69,43 @@ def prepare_chunk_buff(self, db_data, quality, chunk_number):
                 chunk_number=chunk_number, chunk_size=db_data.chunk_size,
                 start=db_data.start_frame, stop=db_data.stop_frame,
                 step=db_data.get_frame_step())
-            for item in reader:
-                source_path = os.path.join(upload_dir, f"{item['name']}{item['extension']}")
-                images.append((source_path, source_path, None))
-
+            if db_data.storage == StorageChoice.CLOUD_STORAGE:
+                db_cloud_storage = db_data.cloud_storage
+                credentials = Credentials()
+                credentials.convert_from_db({
+                    'type': db_cloud_storage.credentials_type,
+                    'value': db_cloud_storage.credentials,
+                })
+                details = {
+                    'resource': db_cloud_storage.resource,
+                    'credentials': credentials,
+                    'specific_attributes': db_cloud_storage.get_specific_attributes()
+                }
+                cloud_storage_instance = get_cloud_storage_instance(cloud_provider=db_cloud_storage.provider_type, **details)
+                cloud_storage_instance.initialize_content()
+                for item in reader:
+                    name = f"{item['name']}{item['extension']}"
+                    if name not in cloud_storage_instance:
+                        raise Exception('{} file was not found on a {} storage'.format(name, cloud_storage_instance.name))
+                    with NamedTemporaryFile(mode='w+b', prefix='cvat', suffix=name, delete=False) as temp_file:
+                        source_path = temp_file.name
+                        buf = cloud_storage_instance.download_fileobj(name)
+                        temp_file.write(buf.getvalue())
+                        if not (checksum := item.get('checksum', None)):
+                            slogger.glob.warning('A manifest file does not contain checksum for image {}'.format(item.get('name')))
+                        if checksum and not md5_hash(source_path) == checksum:
+                            slogger.glob.warning('Hash sums of files {} do not match'.format(name))
+                        images.append((source_path, source_path, None))
+            else:
+                for item in reader:
+                    source_path = os.path.join(upload_dir, f"{item['name']}{item['extension']}")
+                    images.append((source_path, source_path, None))
         writer.save_as_chunk(images, buff)
         buff.seek(0)
+        if db_data.storage == StorageChoice.CLOUD_STORAGE:
+            images = [image_path for image in images if os.path.exists((image_path := image[0]))]
+            for image_path in images:
+                os.remove(image_path)
         return buff, mime_type
 
     def save_chunk(self, db_data_id, chunk_number, quality, buff, mime_type):