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Immutable Folderstore id=>blob pair #1160

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c67e1fb
Immutable Folderstore id=>blob pair
Affie Jul 9, 2025
ddd9e56
Apply suggestions from code review
Affie Jul 15, 2025
d3d4b0b
Merge branch 'develop' into enh/tumbstone_fs
Affie Sep 2, 2025
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43 changes: 29 additions & 14 deletions src/DataBlobs/services/BlobStores.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,10 @@ end

function getBlob(store::FolderStore{T}, blobId::UUID) where {T}
blobfilename = joinpath(store.folder, string(store.label), string(blobId))
if isfile(blobfilename)
tombstonefile = blobfilename * ".deleted"
if isfile(tombstonefile)
throw(IdNotFoundError("Blob (deleted)", blobId))
elseif isfile(blobfilename)
open(blobfilename) do f
return read(f)
end
Expand All @@ -164,24 +167,28 @@ function addBlob!(store::FolderStore{T}, blobId::UUID, data::T) where {T}
end

function updateBlob!(store::FolderStore{T}, blobId::UUID, data::T) where {T}
blobfilename = joinpath(store.folder, string(store.label), string(blobId))
if !isfile(blobfilename)
@warn "Key '$blobId' doesn't exist."
else
open(blobfilename, "w") do f
return write(f, data)
end
return data
end
return error("updateBlob! is obsolete as blobsId=>Blob pairs are immutable.")
end

function deleteBlob!(store::FolderStore{T}, blobId::UUID) where {T}
# Tombstone pattern: instead of deleting the file, create a tombstone marker file
blobfilename = joinpath(store.folder, string(store.label), string(blobId))
if !isfile(blobfilename)
tombstonefile = blobfilename * ".deleted"
if isfile(blobfilename)
# Remove the actual blob file
rm(blobfilename)
# Create a tombstone marker
open(tombstonefile, "w") do f
return write(f, "deleted")
end
return 1
elseif isfile(tombstonefile)
# Already deleted
return 0
else
# Not found
throw(IdNotFoundError("Blob", blobId))
end
rm(blobfilename)
return 1
end

function hasBlob(store::FolderStore, blobId::UUID)
Expand All @@ -191,7 +198,15 @@ end

hasBlob(store::FolderStore, entry::Blobentry) = hasBlob(store, entry.blobId)

listBlobs(store::FolderStore) = readdir(store.folder)
function listBlobs(store::FolderStore)
folder = joinpath(store.folder, string(store.label))
# Parse folder to only include UUIDs automatically excluding tombstone files this way.
blobIds = map(readdir(folder)) do filename
return tryparse(UUID, filename)
end
return filter(!isnothing, blobIds)
end

##==============================================================================
## InMemoryBlobstore
##==============================================================================
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