[PRDP-161] feat: Improve temp file handling

src/main/java/it/gov/pagopa/receipt/pdf/generator/GenerateReceiptPdf.java

@@ -19,11 +19,20 @@
 import it.gov.pagopa.receipt.pdf.generator.service.GenerateReceiptPdfService;
 import it.gov.pagopa.receipt.pdf.generator.service.impl.GenerateReceiptPdfServiceImpl;
 import it.gov.pagopa.receipt.pdf.generator.utils.ObjectMapperUtils;
+import org.apache.commons.io.FileUtils;
 import org.apache.http.HttpStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.Instant;
 import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
 
 /**
  * Azure Functions with Azure Queue trigger.
@@ -33,6 +42,9 @@ public class GenerateReceiptPdf {
     private final Logger logger = LoggerFactory.getLogger(GenerateReceiptPdf.class);
 
     private static final int MAX_NUMBER_RETRY = Integer.parseInt(System.getenv().getOrDefault("COSMOS_RECEIPT_QUEUE_MAX_RETRY", "5"));
+    private static final String WORKING_DIRECTORY_PATH = System.getenv().getOrDefault("WORKING_DIRECTORY_PATH", "");
+
+    private static final String PATTERN_FORMAT = "yyyy.MM.dd.HH.mm.ss";
 
     private final GenerateReceiptPdfService generateReceiptPdfService;
     private final ReceiptCosmosClient receiptCosmosClient;
@@ -101,7 +113,7 @@ public void processGenerateReceipt(
                     queueName = "%RECEIPT_QUEUE_TOPIC%",
                     connection = "RECEIPTS_STORAGE_CONN_STRING")
             OutputBinding<String> requeueMessage,
-            final ExecutionContext context) throws BizEventNotValidException, ReceiptNotFoundException {
+            final ExecutionContext context) throws BizEventNotValidException, ReceiptNotFoundException, IOException {
 
         //Map queue bizEventMessage to BizEvent
         BizEvent bizEvent = getBizEventFromMessage(context, bizEventMessage);
@@ -142,7 +154,13 @@ public void processGenerateReceipt(
                 receipt.getId(),
                 bizEvent.getId());
         //Generate and save PDF
-        PdfGeneration pdfGeneration = generateReceiptPdfService.generateReceipts(receipt, bizEvent);
+        PdfGeneration pdfGeneration;
+        Path workingDirPath = createWorkingDirectory();
+        try {
+            pdfGeneration = generateReceiptPdfService.generateReceipts(receipt, bizEvent, workingDirPath);
+        } finally {
+            deleteTempFolder(workingDirPath);
+        }
 
         //Verify PDF generation success
         boolean success = generateReceiptPdfService.verifyAndUpdateReceipt(receipt, pdfGeneration);
@@ -205,4 +223,25 @@ private BizEvent getBizEventFromMessage(ExecutionContext context, String bizEven
             throw new BizEventNotValidException(errorMsg, e);
         }
     }
+
+    private Path createWorkingDirectory() throws IOException {
+        File workingDirectory = new File(WORKING_DIRECTORY_PATH);
+        if (!workingDirectory.exists()) {
+            try {
+                Files.createDirectory(workingDirectory.toPath());
+            } catch (FileAlreadyExistsException ignored) {}
+        }
+        return Files.createTempDirectory(workingDirectory.toPath(),
+                DateTimeFormatter.ofPattern(PATTERN_FORMAT)
+                        .withZone(ZoneId.systemDefault())
+                        .format(Instant.now()));
+    }
+
+    private void deleteTempFolder(Path workingDirPath) {
+        try {
+            FileUtils.deleteDirectory(workingDirPath.toFile());
+        } catch (IOException e) {
+            logger.warn("Unable to clear working directory: {}", workingDirPath, e);
+        }
+    }
 }

src/main/java/it/gov/pagopa/receipt/pdf/generator/client/PdfEngineClient.java

@@ -3,7 +3,9 @@
 import it.gov.pagopa.receipt.pdf.generator.model.request.PdfEngineRequest;
 import it.gov.pagopa.receipt.pdf.generator.model.response.PdfEngineResponse;
 
+import java.nio.file.Path;
+
 public interface PdfEngineClient {
 
-    PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest);
+    PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest, Path workingDirPath);
 }

src/main/java/it/gov/pagopa/receipt/pdf/generator/client/impl/PdfEngineClientImpl.java

@@ -22,7 +22,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
+import java.nio.file.Path;
 
 /**
  * Client for the PDF Engine
@@ -33,7 +33,6 @@ public class PdfEngineClientImpl implements PdfEngineClient {
 
     private final String pdfEngineEndpoint = System.getenv().getOrDefault("PDF_ENGINE_ENDPOINT", "");
     private final String ocpAimSubKey = System.getenv().getOrDefault("OCP_APIM_SUBSCRIPTION_KEY", "");
-    private final String workingDirectoryPath = System.getenv().getOrDefault("WORKING_DIRECTORY_PATH", "");
 
     private static final String HEADER_AUTH_KEY = "Ocp-Apim-Subscription-Key";
     private static final String ZIP_FILE_NAME = "template.zip";
@@ -64,7 +63,8 @@ public static PdfEngineClientImpl getInstance() {
      * @param pdfEngineRequest Request to the client
      * @return response with the PDF or error message and the status
      */
-    public PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest) {
+    @Override
+    public PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest, Path workingDirPath) {
 
         PdfEngineResponse pdfEngineResponse = new PdfEngineResponse();
 
@@ -86,7 +86,7 @@ public PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest) {
             request.setHeader(HEADER_AUTH_KEY, ocpAimSubKey);
             request.setEntity(entity);
 
-            pdfEngineResponse = handlePdfEngineResponse(client, request);
+            pdfEngineResponse = handlePdfEngineResponse(client, request, workingDirPath);
         } catch (IOException e) {
             handleExceptionErrorMessage(pdfEngineResponse, e);
         }
@@ -101,7 +101,7 @@ public PdfEngineResponse generatePDF(PdfEngineRequest pdfEngineRequest) {
      * @param request The request to the PDF engine
      * @return pdf engine response
      */
-    private PdfEngineResponse handlePdfEngineResponse(CloseableHttpClient client, HttpPost request) {
+    private PdfEngineResponse handlePdfEngineResponse(CloseableHttpClient client, HttpPost request, Path workingDirPath) {
         PdfEngineResponse pdfEngineResponse = new PdfEngineResponse();
         //Execute call
         try (CloseableHttpResponse response = client.execute(request)) {
@@ -113,7 +113,7 @@ private PdfEngineResponse handlePdfEngineResponse(CloseableHttpClient client, Ht
                 try (InputStream inputStream = entityResponse.getContent()) {
                     pdfEngineResponse.setStatusCode(HttpStatus.SC_OK);
 
-                    saveTempPdf(pdfEngineResponse, inputStream);
+                    saveTempPdf(pdfEngineResponse, inputStream, workingDirPath);
                 }
             } else {
                 pdfEngineResponse.setStatusCode(HttpStatus.SC_INTERNAL_SERVER_ERROR);
@@ -134,18 +134,12 @@ private PdfEngineResponse handlePdfEngineResponse(CloseableHttpClient client, Ht
      * @param inputStream       InputStream pdf
      * @throws IOException In case of error to save
      */
-    private void saveTempPdf(PdfEngineResponse pdfEngineResponse, InputStream inputStream) throws IOException {
-        File tempDirectory = new File(workingDirectoryPath);
-        if (!tempDirectory.exists()) {
-            Files.createDirectory(tempDirectory.toPath());
-        }
-
-        File targetFile = File.createTempFile("tempFile", ".pdf", tempDirectory);
+    private void saveTempPdf(PdfEngineResponse pdfEngineResponse, InputStream inputStream, Path workingDirPath) throws IOException {
+        File targetFile = File.createTempFile("tempFile", ".pdf", workingDirPath.toFile());
 
         FileUtils.copyInputStreamToFile(inputStream, targetFile);
 
         pdfEngineResponse.setTempPdfPath(targetFile.getAbsolutePath());
-        pdfEngineResponse.setTempDirectoryPath(tempDirectory.getAbsolutePath());
     }
 
     /**

src/main/java/it/gov/pagopa/receipt/pdf/generator/model/response/PdfEngineResponse.java

@@ -12,7 +12,6 @@
 @NoArgsConstructor
 public class PdfEngineResponse {
 
-    String tempDirectoryPath;
     String tempPdfPath;
     int statusCode;
     String errorMessage;

src/main/java/it/gov/pagopa/receipt/pdf/generator/service/GenerateReceiptPdfService.java

@@ -4,6 +4,8 @@
 import it.gov.pagopa.receipt.pdf.generator.entity.receipt.Receipt;
 import it.gov.pagopa.receipt.pdf.generator.model.PdfGeneration;
 
+import java.nio.file.Path;
+
 public interface GenerateReceiptPdfService {
 
     /**
@@ -13,7 +15,7 @@ public interface GenerateReceiptPdfService {
      * @param bizEvent Biz-event from queue message
      * @return {@link PdfGeneration} object with the result of the PDF generation and store or the relatives error messages
      */
-    PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent);
+    PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent, Path workingDirPath);
 
     /**
      * Verifies if the PDF generation process succeeded or not, and update the receipt with the result

src/main/java/it/gov/pagopa/receipt/pdf/generator/service/impl/GenerateReceiptPdfServiceImpl.java

@@ -32,6 +32,7 @@
 import java.io.IOException;
 import java.net.URL;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.util.Collections;
@@ -63,7 +64,7 @@ public GenerateReceiptPdfServiceImpl(PdfEngineClient pdfEngineClient, ReceiptBlo
      * {@inheritDoc}
      */
     @Override
-    public PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent) {
+    public PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent, Path workingDirPath) {
         PdfGeneration pdfGeneration = new PdfGeneration();
 
         String debtorCF = receipt.getEventData().getDebtorFiscalCode();
@@ -79,7 +80,7 @@ public PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent) {
                     return pdfGeneration;
                 }
                 ReceiptPDFTemplate completeTemplate = buildTemplate(bizEvent, false);
-                PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, PAYER_TEMPLATE_SUFFIX, completeTemplate);
+                PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, PAYER_TEMPLATE_SUFFIX, completeTemplate, workingDirPath);
                 pdfGeneration.setDebtorMetadata(generationResult);
                 return pdfGeneration;
             }
@@ -90,7 +91,7 @@ public PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent) {
             } else {
                 ReceiptPDFTemplate completeTemplate = buildTemplate(bizEvent, false);
 
-                PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, PAYER_TEMPLATE_SUFFIX, completeTemplate);
+                PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, PAYER_TEMPLATE_SUFFIX, completeTemplate, workingDirPath);
                 pdfGeneration.setPayerMetadata(generationResult);
             }
         } else {
@@ -103,7 +104,7 @@ public PdfGeneration generateReceipts(Receipt receipt, BizEvent bizEvent) {
         } else {
             ReceiptPDFTemplate onlyDebtorTemplate = buildTemplate(bizEvent, true);
 
-            PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, DEBTOR_TEMPLATE_SUFFIX, onlyDebtorTemplate);
+            PdfMetadata generationResult = generateAndSavePDFReceipt(bizEvent, DEBTOR_TEMPLATE_SUFFIX, onlyDebtorTemplate, workingDirPath);
             pdfGeneration.setDebtorMetadata(generationResult);
         }
 
@@ -158,11 +159,11 @@ public boolean verifyAndUpdateReceipt(Receipt receipt, PdfGeneration pdfGenerati
         return result;
     }
 
-    private PdfMetadata generateAndSavePDFReceipt(BizEvent bizEvent, String templateSuffix, ReceiptPDFTemplate completeTemplate) {
+    private PdfMetadata generateAndSavePDFReceipt(BizEvent bizEvent, String templateSuffix, ReceiptPDFTemplate completeTemplate, Path workingDirPath) {
         try {
             String dateFormatted = LocalDate.now().format(DateTimeFormatter.ofPattern("yyMMdd"));
             String blobName = String.format("%s-%s-%s-%s", TEMPLATE_PREFIX, dateFormatted, bizEvent.getId(), templateSuffix);
-            PdfEngineResponse pdfEngineResponse = generatePdf(completeTemplate);
+            PdfEngineResponse pdfEngineResponse = generatePDFReceipt(completeTemplate, workingDirPath);
             return saveToBlobStorage(pdfEngineResponse, blobName);
         } catch (PDFReceiptGenerationException e) {
             logger.error("An error occurred when generating or saving the PDF receipt for biz-event {}", bizEvent.getId(), e);
@@ -172,16 +173,13 @@ private PdfMetadata generateAndSavePDFReceipt(BizEvent bizEvent, String template
 
     private PdfMetadata saveToBlobStorage(PdfEngineResponse pdfEngineResponse, String blobName) throws SavePDFToBlobException {
         String tempPdfPath = pdfEngineResponse.getTempPdfPath();
-        String tempDirectoryPath = pdfEngineResponse.getTempDirectoryPath();
 
         BlobStorageResponse blobStorageResponse;
         //Save to Blob Storage
         try (BufferedInputStream pdfStream = new BufferedInputStream(new FileInputStream(tempPdfPath))) {
             blobStorageResponse = receiptBlobClient.savePdfToBlobStorage(pdfStream, blobName);
         } catch (Exception e) {
             throw new SavePDFToBlobException("Error saving pdf to blob storage", ReasonErrorCode.ERROR_BLOB_STORAGE.getCode(), e);
-        } finally {
-            deleteTempFolderAndFile(tempPdfPath, tempDirectoryPath);
         }
 
         if (blobStorageResponse.getStatusCode() != com.microsoft.azure.functions.HttpStatus.CREATED.value()) {
@@ -198,8 +196,7 @@ private PdfMetadata saveToBlobStorage(PdfEngineResponse pdfEngineResponse, Strin
                 .build();
     }
 
-    // TODO fix temp files create a temp dir and pass it to the client
-    private PdfEngineResponse generatePdf(ReceiptPDFTemplate template) throws PDFReceiptGenerationException {
+    private PdfEngineResponse generatePDFReceipt(ReceiptPDFTemplate template, Path workingDirPath) throws PDFReceiptGenerationException {
         PdfEngineRequest request = new PdfEngineRequest();
 
         URL templateStream = GenerateReceiptPdfServiceImpl.class.getClassLoader().getResource("template.zip");
@@ -208,7 +205,7 @@ private PdfEngineResponse generatePdf(ReceiptPDFTemplate template) throws PDFRec
         request.setData(parseTemplateDataToString(template));
         request.setApplySignature(false);
 
-        PdfEngineResponse pdfEngineResponse = pdfEngineClient.generatePDF(request);
+        PdfEngineResponse pdfEngineResponse = pdfEngineClient.generatePDF(request, workingDirPath);
 
         if (pdfEngineResponse.getStatusCode() != HttpStatus.SC_OK) {
             throw new GeneratePDFException(pdfEngineResponse.getErrorMessage(), pdfEngineResponse.getStatusCode());
@@ -272,26 +269,6 @@ private ReceiptPDFTemplate buildTemplate(BizEvent bizEvent, boolean partialTempl
                 .build();
     }
 
-    private void deleteTempFolderAndFile(String tempPdfPath, String tempDirectoryPath) {
-        File tempFile = new File(tempPdfPath);
-        if (tempFile.exists()) {
-            try {
-                Files.delete(tempFile.toPath());
-            } catch (IOException e) {
-                logger.warn("Error deleting temporary pdf file from file system", e);
-            }
-        }
-
-        File tempDirectory = new File(tempDirectoryPath);
-        if (tempDirectory.exists()) {
-            try {
-                Files.delete(tempDirectory.toPath());
-            } catch (IOException e) {
-                logger.warn("Error deleting temporary pdf directory from file system", e);
-            }
-        }
-    }
-
     private String parseTemplateDataToString(ReceiptPDFTemplate template) throws GeneratePDFException {
         try {
             return ObjectMapperUtils.writeValueAsString(template);