#182: thumbnail generation asynchronous

docs-core/src/main/java/com/sismics/docs/core/event/FileCreatedAsyncEvent.java

@@ -26,13 +26,6 @@ public class FileCreatedAsyncEvent extends UserEvent {
      */
     private Path unencryptedFile;
     
-    /**
-     * Unencrypted file containing PDF representation
-     * of the original file. May be null if the PDF conversion is not
-     * necessary or not possible.
-     */
-    private Path unencryptedPdfFile;
-    
     public File getFile() {
         return file;
     }
@@ -58,15 +51,6 @@ public class FileCreatedAsyncEvent extends UserEvent {
         return this;
     }
 
-    public Path getUnencryptedPdfFile() {
-        return unencryptedPdfFile;
-    }
-
-    public FileCreatedAsyncEvent setUnencryptedPdfFile(Path unencryptedPdfFile) {
-        this.unencryptedPdfFile = unencryptedPdfFile;
-        return this;
-    }
-
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(this)

docs-core/src/main/java/com/sismics/docs/core/listener/async/FileCreatedAsyncListener.java

@@ -2,15 +2,23 @@ package com.sismics.docs.core.listener.async;
 
 import com.google.common.eventbus.Subscribe;
 import com.sismics.docs.core.dao.jpa.FileDao;
+import com.sismics.docs.core.dao.jpa.UserDao;
 import com.sismics.docs.core.dao.lucene.LuceneDao;
 import com.sismics.docs.core.event.FileCreatedAsyncEvent;
 import com.sismics.docs.core.model.jpa.File;
+import com.sismics.docs.core.model.jpa.User;
+import com.sismics.docs.core.util.EncryptionUtil;
 import com.sismics.docs.core.util.FileUtil;
+import com.sismics.docs.core.util.PdfUtil;
 import com.sismics.docs.core.util.TransactionUtil;
+import com.sismics.util.mime.MimeTypeUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import javax.crypto.Cipher;
+import java.nio.file.Path;
 import java.text.MessageFormat;
+import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Listener on file created.
@@ -26,22 +34,55 @@ public class FileCreatedAsyncListener {
     /**
      * File created.
      * 
-     * @param fileCreatedAsyncEvent File created event
+     * @param event File created event
      */
     @Subscribe
-    public void on(final FileCreatedAsyncEvent fileCreatedAsyncEvent) {
+    public void on(final FileCreatedAsyncEvent event) {
         if (log.isInfoEnabled()) {
-            log.info("File created event: " + fileCreatedAsyncEvent.toString());
+            log.info("File created event: " + event.toString());
+        }
+
+        // Guess the mime type a second time, for open document format (first detected as simple ZIP file)
+        final File file = event.getFile();
+        file.setMimeType(MimeTypeUtil.guessOpenDocumentFormat(file, event.getUnencryptedFile()));
+
+        // Convert to PDF if necessary (for thumbnail and text extraction)
+        Path unencryptedPdfFile = null;
+        try {
+            unencryptedPdfFile = PdfUtil.convertToPdf(file, event.getUnencryptedFile());
+        } catch (Exception e) {
+            log.error("Unable to convert to PDF", e);
+        }
+
+        // Get the user from the database
+        final AtomicReference<User> user = new AtomicReference<>();
+        TransactionUtil.handle(new Runnable() {
+            @Override
+            public void run() {
+                UserDao userDao = new UserDao();
+                user.set(userDao.getById(event.getUserId()));
+            }
+        });
+        if (user.get() == null) {
+            // The user has been deleted meanwhile
+            return;
+        }
+
+        // Generate file variations
+        try {
+            Cipher cipher = EncryptionUtil.getEncryptionCipher(user.get().getPrivateKey());
+            FileUtil.saveVariations(file, event.getUnencryptedFile(), unencryptedPdfFile, cipher);
+        } catch (Exception e) {
+            log.error("Unable to generate thumbnails", e);
         }
 
         // Extract text content from the file
-        final File file = fileCreatedAsyncEvent.getFile();
         long startTime = System.currentTimeMillis();
-        final String content = FileUtil.extractContent(fileCreatedAsyncEvent.getLanguage(), file,
+        final String content = FileUtil.extractContent(event.getLanguage(), file,
-                fileCreatedAsyncEvent.getUnencryptedFile(), fileCreatedAsyncEvent.getUnencryptedPdfFile());
+                event.getUnencryptedFile(), unencryptedPdfFile);
         log.info(MessageFormat.format("File content extracted in {0}ms", System.currentTimeMillis() - startTime));
 
-        // Store the text content in the database
+        // Save the file to database
         TransactionUtil.handle(new Runnable() {
             @Override
             public void run() {
@@ -58,7 +99,7 @@ public class FileCreatedAsyncListener {
         
         // Update Lucene index
         LuceneDao luceneDao = new LuceneDao();
-        luceneDao.createFile(fileCreatedAsyncEvent.getFile());
+        luceneDao.createFile(event.getFile());
 
         FileUtil.endProcessingFile(file.getId());
     }

docs-core/src/main/java/com/sismics/docs/core/util/FileUtil.java

@@ -121,29 +121,6 @@ public class FileUtil {
         return ocrFile(image, language);
     }
     
-    /**
-     * Save a file on the storage filesystem.
-     * 
-     * @param unencryptedFile Unencrypted file
-     * @param unencryptedPdfFile Unencrypted PDF file
-     * @param file File to save
-     * @param privateKey Private key used for encryption
-     */
-    public static void save(Path unencryptedFile, Path unencryptedPdfFile, File file, String privateKey) throws Exception {
-        Cipher cipher = EncryptionUtil.getEncryptionCipher(privateKey);
-        Path path = DirectoryUtil.getStorageDirectory().resolve(file.getId());
-        try (InputStream inputStream = Files.newInputStream(unencryptedFile)) {
-            Files.copy(new CipherInputStream(inputStream, cipher), path);
-        }
-
-        // Generate file variations (errors non-blocking)
-        try {
-            saveVariations(file, unencryptedFile, unencryptedPdfFile, cipher);
-        } catch (Exception e) {
-            log.error("Unable to generate thumbnails", e);
-        }
-    }
-
     /**
      * Generate file variations.
      * 
@@ -152,7 +129,7 @@ public class FileUtil {
      * @param unencryptedPdfFile Unencrypted PDF file
      * @param cipher Cipher to use for encryption
      */
-    private static void saveVariations(File file, Path unencryptedFile, Path unencryptedPdfFile, Cipher cipher) throws Exception {
+    public static void saveVariations(File file, Path unencryptedFile, Path unencryptedPdfFile, Cipher cipher) throws Exception {
         BufferedImage image = null;
         if (ImageUtil.isImage(file.getMimeType())) {
             try (InputStream inputStream = Files.newInputStream(unencryptedFile)) {
@@ -262,14 +239,12 @@ public class FileUtil {
         file.setUserId(userId);
         String fileId = fileDao.create(file, userId);
 
-        // Guess the mime type a second time, for open document format (first detected as simple ZIP file)
-        file.setMimeType(MimeTypeUtil.guessOpenDocumentFormat(file, unencryptedFile));
-
-        // Convert to PDF if necessary (for thumbnail and text extraction)
-        java.nio.file.Path unencryptedPdfFile = PdfUtil.convertToPdf(file, unencryptedFile);
-
         // Save the file
-        FileUtil.save(unencryptedFile, unencryptedPdfFile, file, user.getPrivateKey());
+        Cipher cipher = EncryptionUtil.getEncryptionCipher(user.getPrivateKey());
+        Path path = DirectoryUtil.getStorageDirectory().resolve(file.getId());
+        try (InputStream inputStream = Files.newInputStream(unencryptedFile)) {
+            Files.copy(new CipherInputStream(inputStream, cipher), path);
+        }
 
         // Update the user quota
         user.setStorageCurrent(user.getStorageCurrent() + fileSize);
@@ -283,7 +258,6 @@ public class FileUtil {
             fileCreatedAsyncEvent.setLanguage(language);
             fileCreatedAsyncEvent.setFile(file);
             fileCreatedAsyncEvent.setUnencryptedFile(unencryptedFile);
-            fileCreatedAsyncEvent.setUnencryptedPdfFile(unencryptedPdfFile);
             ThreadLocalContext.get().addAsyncEvent(fileCreatedAsyncEvent);
 
             DocumentUpdatedAsyncEvent documentUpdatedAsyncEvent = new DocumentUpdatedAsyncEvent();

docs-web/src/main/java/com/sismics/docs/rest/resource/FileResource.java

@@ -17,7 +17,6 @@ import com.sismics.docs.core.model.jpa.User;
 import com.sismics.docs.core.util.DirectoryUtil;
 import com.sismics.docs.core.util.EncryptionUtil;
 import com.sismics.docs.core.util.FileUtil;
-import com.sismics.docs.core.util.PdfUtil;
 import com.sismics.rest.exception.ClientException;
 import com.sismics.rest.exception.ForbiddenClientException;
 import com.sismics.rest.exception.ServerException;
@@ -202,7 +201,6 @@ public class FileResource extends BaseResource {
             fileCreatedAsyncEvent.setLanguage(documentDto.getLanguage());
             fileCreatedAsyncEvent.setFile(file);
             fileCreatedAsyncEvent.setUnencryptedFile(unencryptedFile);
-            fileCreatedAsyncEvent.setUnencryptedPdfFile(PdfUtil.convertToPdf(file, unencryptedFile));
             ThreadLocalContext.get().addAsyncEvent(fileCreatedAsyncEvent);
             
             DocumentUpdatedAsyncEvent documentUpdatedAsyncEvent = new DocumentUpdatedAsyncEvent();