91 lines
2.6 KiB
Ruby
91 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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class ImageProcessorJob < ApplicationJob
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class FileNotScannedYetError < StandardError
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end
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# If by the time the job runs the blob has been deleted, ignore the error
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discard_on ActiveRecord::RecordNotFound
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# If the file is deleted during the scan, ignore the error
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discard_on ActiveStorage::FileNotFoundError
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# If the file is not analyzed or scanned for viruses yet, retry later
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# (to avoid modifying the file while it is being scanned).
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retry_on FileNotScannedYetError, wait: :exponentially_longer, attempts: 10
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rescue_from ActiveStorage::PreviewError do
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retry_or_discard
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end
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def perform(blob)
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return if blob.nil?
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raise FileNotScannedYetError if blob.virus_scanner.pending?
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return if ActiveStorage::Attachment.find_by(blob_id: blob.id)&.record_type == "ActiveStorage::VariantRecord"
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auto_rotate(blob) if ["image/jpeg", "image/jpg"].include?(blob.content_type)
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uninterlace(blob) if blob.content_type == "image/png"
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create_representations(blob) if blob.representation_required?
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add_watermark(blob) if blob.watermark_pending?
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end
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private
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def auto_rotate(blob)
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blob.open do |file|
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Tempfile.create(["rotated", File.extname(file)]) do |output|
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processed = AutoRotateService.new.process(file, output)
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return if processed.blank?
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blob.upload(processed) # also update checksum & byte_size accordingly
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blob.save!
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end
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end
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end
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def uninterlace(blob)
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blob.open do |file|
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processed = UninterlaceService.new.process(file)
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return if processed.blank?
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blob.upload(processed)
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blob.save!
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end
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end
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def create_representations(blob)
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blob.attachments.each do |attachment|
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next unless attachment&.representable?
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attachment.representation(resize_to_limit: [400, 400]).processed
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if attachment.blob.content_type.in?(RARE_IMAGE_TYPES)
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attachment.variant(resize_to_limit: [2000, 2000]).processed
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end
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if attachment.record.class == ActionText::RichText
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attachment.variant(resize_to_limit: [1024, 768]).processed
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end
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end
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end
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def add_watermark(blob)
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return if blob.watermark_done?
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blob.open do |file|
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Tempfile.create(["watermarked", File.extname(file)]) do |output|
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processed = WatermarkService.new.process(file, output)
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return if processed.blank?
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blob.upload(processed) # also update checksum & byte_size accordingly
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blob.watermarked_at = Time.current
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blob.save!
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end
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end
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end
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def retry_or_discard
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if executions < max_attempts
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retry_job wait: 5.minutes
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end
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end
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def max_attempts
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3
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end
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end
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