The new package internal/imagerequest holds the request type, its two
parts Source and Transform, the Format and Fit types, the dimension and
fit checks, the /v1/image/ path parsing and the variant key; it imports
no other package of pixa. imgcache.ParsedURL, imgcache.ImageRequest,
signature.Request, imageprocessor.Request, the second Size, format and
fit types and the conversions between them are gone. The image
processor takes a Transform only. encurl keeps a private struct with the
token's CBOR field names, so tokens made before still decode. VariantKey
moves with the function that makes it. Tests follow the moved and
renamed code; the tests of the removed conversions go with them.
Model: opus-5-5
A crash could leave a cached source or transformed image empty or cut
short, and pixa then served it, or fetched it again forever. Source and
transformed image files, and the .meta file beside each transformed
image, are now written under a temporary name, synced, renamed into
place and their directory synced; a failed directory sync removes the
renamed file. The reconciliation pass compares each cached file's size
with the size its row records and removes a file that is empty or of
another size, with its rows and a warning. Requests compare no sizes.
Not verified by a test: the syncs, and the removal after a failed sync.
Model: opus-5-5
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