Merge branch 'issue-9361' into 'rails'

feat: implementar un servicio liviano de git-lfs #9361

See merge request sutty/sutty!129

app/lib/active_storage/service/jekyll_service.rb

@@ -4,11 +4,6 @@ module ActiveStorage
   class Service
     # Sube los archivos a cada repositorio y los agrega al LFS de su
     # repositorio git.
-    #
-    # @todo: Implementar LFS.  No nos gusta mucho la idea porque duplica
-    # el espacio en disco, pero es la única forma que tenemos (hasta que
-    # implementemos IPFS) para poder transferir los archivos junto con el
-    # sitio.
     class JekyllService < Service::DiskService
       # Genera un servicio para un sitio determinado
       #
@@ -27,7 +22,10 @@ module ActiveStorage
       # @param :checksum [String]
       def upload(key, io, checksum: nil, **)
         instrument :upload, key: key, checksum: checksum do
-          IO.copy_stream(io, make_path_for(key)) unless exist?(key)
+          unless exist?(key)
+            IO.copy_stream(io, make_path_for(key))
+            LfsObjectService.new(site: site, blob: blob_for(key)).process
+          end
           ensure_integrity_of(key, checksum) if checksum
         end
       end
@@ -79,7 +77,7 @@ module ActiveStorage
       # @param :key [String]
       # @return [String]
       def filename_for(key)
-        ActiveStorage::Blob.where(key: key).limit(1).pluck(:filename).first.tap do |filename|
+        blob_for(key).filename.to_s.tap do |filename|
           raise ArgumentError, "Filename for key #{key} is blank" if filename.blank?
         end
       end
@@ -91,6 +89,15 @@ module ActiveStorage
       def path_for(key)
         File.join root, folder_for(key), filename_for(key)
       end
+
+      # @return [Site]
+      def site
+        @site ||= Site.find_by_name(name)
+      end
+
+      def blob_for(key)
+        ActiveStorage::Blob.find_by(key: key, service_name: name)
+      end
     end
   end
 end

app/models/site/repository.rb

@@ -117,6 +117,9 @@ class Site
     def commit(file:, usuarie:, message:, remove: false)
       file = [file] unless file.respond_to? :each
 
+      # Cargar el árbol actual
+      rugged.index.read_tree rugged.head.target.tree
+
       file.each do |f|
         remove ? rm(f) : add(f)
       end

app/services/lfs_object_service.rb

@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+# Representa un objeto git LFS
+class LfsObjectService
+  attr_reader :site, :blob
+
+  # @param :site [Site]
+  # @param :blob [ActiveStorage::Blob]
+  def initialize(site:, blob:)
+    @site = site
+    @blob = blob
+  end
+
+  def process
+    # Crear el directorio
+    FileUtils.mkdir_p(File.dirname(object_path))
+
+    # Mover el archivo
+    FileUtils.mv(path, object_path) unless File.exist? object_path
+
+    # Crear el pointer
+    Site::Writer.new(site: site, file: path, content: pointer).save
+
+    # Commitear el pointer
+    site.repository.commit(file: path, usuarie: author, message: File.basename(path))
+
+    # Eliminar el pointer
+    FileUtils.rm(path)
+
+    # Hacer link duro del objeto al archivo
+    FileUtils.ln(object_path, path)
+  end
+
+  # @return [String]
+  def path
+    @path ||= blob.service.path_for(blob.key)
+  end
+
+  # @return [String]
+  def digest
+    @digest ||= Digest::SHA256.file(path).hexdigest
+  end
+
+  # @return [String]
+  def object_path
+    @object_path ||= File.join(site.path, '.git', 'lfs', 'objects', digest[0..1], digest[2..3], digest)
+  end
+
+  # @return [Integer]
+  def size
+    @size ||= File.size(File.exist?(object_path) ? object_path : path)
+  end
+
+  # @return [String]
+  def pointer
+    @pointer ||=
+      <<~POINTER
+        version https://git-lfs.github.com/spec/v1
+        oid sha256:#{digest}
+        size #{size}
+      POINTER
+  end
+
+  def author
+    @author ||= GitAuthor.new email: "disk_service@#{Site.domain}", name: 'DiskService'
+  end
+end