Increase image quality of downscaled images from 70 to 95

api/funkwhale_api/cli/media.py

@@ -0,0 +1,58 @@
+import click
+
+from django.core.cache import cache
+from django.conf import settings
+
+from versatileimagefield.image_warmer import VersatileImageFieldWarmer
+from versatileimagefield import settings as vif_settings
+
+from funkwhale_api.common import utils as common_utils
+from funkwhale_api.common.models import Attachment
+
+from . import base
+
+
+@base.cli.group()
+def media():
+    """Manage media files (avatars, covers, attachments…)"""
+    pass
+
+
+@media.command("generate-thumbnails")
+def generate_thumbnails():
+    """
+    Generate thumbnails for all images (avatars, covers, etc.).
+
+    This can take a long time and generate a lot of I/O depending of the size
+    of your library.
+    """
+    MODELS = [
+        (Attachment, "file", "attachment_square"),
+    ]
+    for model, attribute, key_set in MODELS:
+        click.echo(
+            "Generating thumbnails for {}.{}…".format(model._meta.label, attribute)
+        )
+        qs = model.objects.exclude(**{"{}__isnull".format(attribute): True})
+        qs = qs.exclude(**{attribute: ""})
+        cache_key = "*{}{}*".format(
+            settings.MEDIA_URL, vif_settings.VERSATILEIMAGEFIELD_SIZED_DIRNAME
+        )
+        entries = cache.keys(cache_key)
+        if entries:
+            click.echo(
+                "  Clearing {} cache entries: {}…".format(len(entries), cache_key)
+            )
+            for keys in common_utils.batch(iter(entries)):
+                cache.delete_many(keys)
+        warmer = VersatileImageFieldWarmer(
+            instance_or_queryset=qs,
+            rendition_key_set=key_set,
+            image_attr=attribute,
+            verbose=True,
+        )
+        click.echo("  Creating images")
+        num_created, failed_to_create = warmer.warm()
+        click.echo(
+            "  {} created, {} in error".format(num_created, len(failed_to_create))
+        )