Revert "Revert "Timeout slow libreoffice preview generation [SCI-10809]""

app/jobs/pdf_preview_job.rb

@@ -16,39 +16,9 @@ class PdfPreviewJob < ApplicationJob
 
   def perform(asset_id)
     asset = Asset.find(asset_id)
-    blob = asset.file.blob
-    blob.open(tmpdir: tempdir) do |input|
-      work_dir = File.dirname(input.path)
-      preview_filename = "#{File.basename(input.path, '.*')}.pdf"
-      preview_file = File.join(work_dir, preview_filename)
-      Rails.logger.info "Starting preparing document preview for file #{blob.filename.sanitized}..."
 
-      ActiveRecord::Base.transaction do
+    PdfPreviewService.new(asset.file.blob, asset.file_pdf_preview).generate!
-        success = system(
+  ensure
-          libreoffice_path, '--headless', '--invisible', '--convert-to', 'pdf', '--outdir', work_dir, input.path
+    asset.update(pdf_preview_processing: false)
-        )
-        unless success && File.file?(preview_file)
-          raise StandardError, "There was an error generating PDF preview, blob id: #{blob.id}"
-        end
-
-        ActiveRecord::Base.no_touching do
-          asset.file_pdf_preview.attach(io: File.open(preview_file), filename: "#{blob.filename.base}.pdf")
-          asset.update(pdf_preview_processing: false)
-        end
-        Rails.logger.info("Finished preparing PDF preview for file #{blob.filename.sanitized}.")
-      end
-    ensure
-      File.delete(preview_file) if File.file?(preview_file)
-    end
-  end
-
-  private
-
-  def tempdir
-    Rails.root.join('tmp')
-  end
-
-  def libreoffice_path
-    ENV['LIBREOFFICE_PATH'] || 'soffice'
   end
 end

app/jobs/reports/docx_preview_job.rb

@@ -15,39 +15,7 @@ module Reports
 
     def perform(report_id)
       report = Report.find(report_id)
-      blob = report.docx_file.blob
+      PdfPreviewService.new(report.docx_file.blob, report.docx_preview_file).generate!
-      blob.open(tmpdir: tempdir) do |input|
-        work_dir = File.dirname(input.path)
-        preview_filename = "#{File.basename(input.path, '.*')}.pdf"
-        preview_file = File.join(work_dir, preview_filename)
-        Rails.logger.info "Starting preparing document preview for file #{blob.filename.sanitized}..."
-
-        ActiveRecord::Base.transaction do
-          success = system(
-            libreoffice_path, '--headless', '--invisible', '--convert-to', 'pdf', '--outdir', work_dir, input.path
-          )
-          unless success && File.file?(preview_file)
-            raise StandardError, "There was an error generating PDF preview, blob id: #{blob.id}"
-          end
-
-          ActiveRecord::Base.no_touching do
-            report.docx_preview_file.attach(io: File.open(preview_file), filename: "#{blob.filename.base}.pdf")
-          end
-          Rails.logger.info("Finished preparing PDF preview for file #{blob.filename.sanitized}.")
-        end
-      ensure
-        File.delete(preview_file) if File.file?(preview_file)
-      end
-    end
-
-    private
-
-    def tempdir
-      Rails.root.join('tmp')
-    end
-
-    def libreoffice_path
-      ENV['LIBREOFFICE_PATH'] || 'soffice'
     end
   end
 end

app/services/pdf_preview_service.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+class PdfPreviewService
+  def initialize(blob, attached)
+    @blob = blob
+    @attached = attached
+  end
+
+  def generate!
+    preview_file = nil
+
+    @blob.open(tmpdir: tempdir) do |input|
+      work_dir = File.dirname(input.path)
+      preview_filename = "#{File.basename(input.path, '.*')}.pdf"
+      preview_file = File.join(work_dir, preview_filename)
+      Rails.logger.info "Starting preparing document preview for file #{@blob.filename.sanitized}..."
+
+      ActiveRecord::Base.transaction do
+        success = system(
+          'timeout',
+          Constants::PREVIEW_TIMEOUT_SECONDS.to_s,
+          libreoffice_path,
+          '--headless',
+          '--invisible',
+          '--convert-to',
+          'pdf', '--outdir',
+          work_dir, input.path
+        )
+        unless success && File.file?(preview_file)
+          raise StandardError, "There was an error generating PDF preview, blob id: #{@blob.id}"
+        end
+
+        ActiveRecord::Base.no_touching do
+          attached.attach(io: File.open(preview_file), filename: "#{@blob.filename.base}.pdf")
+        end
+        Rails.logger.info("Finished preparing PDF preview for file #{@blob.filename.sanitized}.")
+      end
+    end
+  ensure
+    File.delete(preview_file) if File.file?(preview_file)
+  end
+
+  private
+
+  def tempdir
+    Rails.root.join('tmp')
+  end
+
+  def libreoffice_path
+    ENV['LIBREOFFICE_PATH'] || 'soffice'
+  end
+end

config/initializers/constants.rb

@@ -328,6 +328,9 @@ class Constants
 
   PREVIEWABLE_FILE_TYPES = TEXT_EXTRACT_FILE_TYPES
 
+  # default preview timeout to 15 minutes
+  PREVIEW_TIMEOUT_SECONDS = ENV['PREVIEW_TIMEOUT_SECONDS'] ? ENV['PREVIEW_TIMEOUT_SECONDS'].to_i : 900
+
   WHITELISTED_IMAGE_TYPES = [
     'gif', 'jpeg', 'pjpeg', 'png', 'x-png', 'svg+xml', 'bmp', 'tiff', 'jpg'
   ].freeze

lib/active_storage/previewer/libreoffice_previewer.rb

@@ -22,7 +22,12 @@ module ActiveStorage
 
           begin
             success = system(
-              libreoffice_path, '--headless', '--invisible', '--convert-to', 'png', '--outdir', work_dir, input.path
+              'timeout',
+              Constants::PREVIEW_TIMEOUT_SECONDS.to_s,
+              libreoffice_path,
+              '--headless', '--invisible', '--convert-to', 'png', '--outdir',
+              work_dir,
+              input.path
             )
 
             unless success && File.file?(preview_file)