Reputation: 99
I'm working on a Spring Boot application where I need to download log files from a mock service and save them as GZIP files on a Windows system. However, I've encountered an issue where the saved .gz
file contains another .gz
file inside it, which is not the intended behavior.
When I retrieve the log data from the service and save it as a .gz
file, the resulting file at C:\sgtw\downInternal\system.log-2024-07-21-1721500200.gz
contains another GZIP file with the same name inside it. This inner GZIP file, when extracted, contains the actual log data.
I want the log data to be saved directly in the GZIP file without any nested structure. The final output should be a single .gz
file containing the log data directly.
Here’s the relevant part of my controller code:
@Controller
public class MyController {
@PostMapping("/download-logs")
public String downloadLogs(@RequestParam List<String> entryCheckbox,
@RequestParam String token,
@RequestParam Map<String, String> allRequestParams,
Model model) {
System.out.println("Inside downloadLogs method of controller");
System.out.println("Token value is: " + token);
List<String> successfullyDownloadedFiles = new ArrayList<>();
// Check if any log files are selected
if (entryCheckbox.isEmpty()) {
model.addAttribute("errorMessage", "No log files selected for download.");
return "downloaded_sgtw"; // Redirect to a result page with an error
}
try {
String ids = String.join(",", entryCheckbox);
byte[] logData = sgtwService.fetchLogsFromMockService(ids, token.replace("Bearer ", ""));
// Check if the fetched log data is valid
if (logData == null || logData.length == 0) {
model.addAttribute("errorMessage", "No log data retrieved. Please check the selected log files.");
return "downloaded_sgtw"; // Redirect to a result page with an error
}
// Retrieve the log name from the request parameters which should include the .gz extension
String logName = allRequestParams.get("logName_" + entryCheckbox.get(0));
if (logName == null || !logName.endsWith(".gz")) {
model.addAttribute("errorMessage", "Invalid log name. Ensure it includes the .gz extension.");
return "downloaded_sgtw"; // Redirect to a result page with an error
}
// Specify the directory where you want to save the file
String destinationDir = "C:\\sgtw\\downInternal";
String destinationPath = Paths.get(destinationDir, logName).toString(); // Use the log name directly
System.out.println("Destination Path: " + destinationPath);
System.out.println("Log data byte array length: " + logData.length);
// Write the log data directly to the file
try (FileOutputStream fileOutputStream = new FileOutputStream(destinationPath)) {
fileOutputStream.write(logData); // Write the byte array directly
} // Automatically closes the stream here
successfullyDownloadedFiles.add(logName);
// Processing for success messages
model.addAttribute("successMessage", "Logs saved successfully at: " + destinationPath);
} catch (IOException e) {
e.printStackTrace();
model.addAttribute("errorMessage", "Error occurred while downloading logs: " + e.getMessage());
}
return "downloaded_sgtw"; // Redirect to the result page
}
}
.gz
file containing the log data, but instead, I receive a nested .gz
file structure.How can I modify my implementation to ensure that the log data is saved directly in the GZIP file without any nested GZIP files? Any help would be greatly appreciated!
Upvotes: 0
Views: 72
Reputation: 99
Thank you all for your insightful comments and suggestions regarding the issue I am facing with my Spring Boot application.
After reviewing the feedback, it seems that the root cause of the problem lies within the mock service that is generating a tar archive of the logs instead of a single log file. This explains why I was encountering a GZIP file containing another GZIP file when I attempted to save the logs.
To address this, I have modified my code to first extract the log files from the tar archive before attempting to decompress them. Here’s the updated code snippet that implements this change:
// Check if the fetched log data is valid
if (logData == null || logData.length == 0) {
model.addAttribute("errorMessage", "No log data retrieved. Please check the selected log files.");
return "downloaded_sgtw"; // Redirect to a result page with an error
}
// Specify the directory where you want to save the file
String destinationDir = "C:\\sgtw\\downInternal";
// Extract the log files from the tar archive
try (TarArchiveInputStream tarInputStream = new TarArchiveInputStream(new ByteArrayInputStream(logData))) {
TarArchiveEntry entry;
while ((entry = tarInputStream.getNextEntry()) != null) {
if (entry.isDirectory()) {
continue;
}
String fileName = entry.getName();
String destinationPath = Paths.get(destinationDir, fileName).toString();
try (FileOutputStream fileOutputStream = new FileOutputStream(destinationPath)) {
IOUtils.copy(tarInputStream, fileOutputStream);
}
successfullyDownloadedFiles.add(fileName);
}
} catch (IOException e) {
e.printStackTrace();
model.addAttribute("errorMessage", "Error occurred while downloading logs: " + e.getMessage());
}
This code effectively extracts each log file from the tar archive and saves it in the specified directory. I appreciate the suggestion to inspect the HTTP response, as this helped me understand that the data being returned was not in the expected format.
Thank you again for your assistance! If there are any further improvements or considerations to make, please let me know.
Upvotes: 1