Collect logs with LogService

Overview

The NFC Wallet SDK collects runtime logs and stores them in the application sandbox.

Your digital wallet application can retrieve log files and share them with Thales for troubleshooting.

Starting with NFC Wallet SDK 6.14.0, logging is enabled automatically with the default configuration.

SDK integration

Get the log service

Secure logger API is deprecated. You need to use LogService.

See Migrate from secure logger api for more details.

Retrieve the LogService instance:

Java

LogService logService = SDKInitializer.getLogService(context);

Kotlin

The SDK applies the default configuration automatically during SDK initialization.

Java

// Before 6.14.0
SecureLog secureLog = SDKInitializer.INSTANCE.configureSecureLog(
        new SecureLogConfig.Builder(context)
                .build()
);

secureLog.setLevel(SecureLogLevel.INFO);
List<File> files = secureLog.getFiles();
secureLog.deleteFiles();

// Since 6.14.0
LogService logService = SDKInitializer.getLogService(context);

logService.setLevel(LogService.Level.INFO);
List<File> files = logService.getFiles();
logService.deleteFiles();

Kotlin

Change log level

Use setLevel(...) to change the log level. The default log level is Level.WARN.

Java

LogService logService = SDKInitializer.getLogService(context);
logService.setLevel(LogService.Level.INFO);

Kotlin

Set the level to OFF to stop writing new log entries.

Log levels

Use the lowest level that supports your use case.

Level	Numeric value	Use
ALL	7	Capture all log entries. Equivalent to DEBUG.
DEBUG	7	Capture detailed logs for troubleshooting. Use temporarily only.
INFO	6	Capture routine operational logs.
ERROR	3	Capture runtime errors that require investigation.
WARN	4	Capture warnings. This is the default level.
FATAL	2	Capture unrecoverable runtime errors only.
OFF	0	Disable logging.

Use DEBUG only for short troubleshooting sessions.

For normal operation, keep the default level WARN.

Disable logging

Starting with NFC Wallet SDK 6.14.0, logging is enabled by default.

Set the level to OFF to disable it:

Java

LogService logService = SDKInitializer.getLogService(context);
logService.setLevel(LogService.Level.OFF);

Kotlin

Retrieve log files

After you retrieve the LogService instance, call getFiles():

Java

LogService logService = SDKInitializer.getLogService(context);

// Return the list of files
List<File> files = logService.getFiles();

Kotlin

Call deleteFiles() to delete the log files:

Java

LogService logService = SDKInitializer.getLogService(context);
logService.deleteFiles();

Kotlin

Full example

This example retrieves the log service instance, zips all log files, and shares them using an Android share sheet.

Java

LogServiceHelper.java

public class LogServiceHelper {

    private static LogService getLogService(Context context) {
        return SDKInitializer.getLogService(context);
    }

    public static void setDebugLogLevel(Context context) {
        LogService logService = getLogService(context);
        logService.setLevel(LogService.Level.DEBUG);
    }

    public static void shareLogs(Activity activity) {
        LogService logService = getLogService(activity.getApplicationContext());
        List<File> files = logService.getFiles();
        if (files == null || files.isEmpty()) {
            // No log to share
            return;
        }

        File directory = files.get(0).getParentFile();
        String outputZipPath = activity.getCacheDir().getAbsolutePath() + "/temp.zip";

        Thread zipTask = new Thread(new Runnable() {
            @Override
            public void run() {
                File file = new File(outputZipPath);
                if (file.exists()) {
                    file.delete();
                }

                zipFolder(directory.getAbsolutePath(), outputZipPath);

                if (!file.exists() || !file.canRead()) {
                    return;
                }

                // If you use a FileProvider, declare it in the application manifest.
                Uri uri = FileProvider.getUriForFile(activity, "your.fileprovider.authority", file);

                Intent shareIntent = new Intent(Intent.ACTION_SEND);
                shareIntent.setType("application/zip");
                shareIntent.putExtra(Intent.EXTRA_SUBJECT, "Log files");
                shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
                shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

                activity.startActivity(Intent.createChooser(shareIntent, "Share logs"));
            }
        });

        zipTask.start();
    }

    private static void zipFolder(String inputFolderPath, String outZipPath) {
        try {
            FileOutputStream fos = new FileOutputStream(outZipPath);
            ZipOutputStream zos = new ZipOutputStream(fos);
            File srcFile = new File(inputFolderPath);
            File[] files = srcFile.listFiles();

            for (int i = 0; i < files.length; i++) {
                byte[] buffer = new byte[1024];
                FileInputStream fis = new FileInputStream(files[i]);
                zos.putNextEntry(new ZipEntry(files[i].getName()));
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zos.write(buffer, 0, length);
                }
                zos.closeEntry();
                fis.close();
            }
            zos.close();
        } catch (IOException ioe) {
            Log.e("", ioe.getMessage());
        }
    }
}

Kotlin

Migrate from secure logger API

Remove the deprecated configuration code.

Then retrieve the LogService instance when you need it.

Deprecated API	Replacement
SDKInitializer.INSTANCE.configureSecureLog(SecureLogConfig)	SDKInitializer.getLogService(Context)
SecureLogConfig.Builder(...)	No replacement. The SDK uses the default configuration.
secureLog.setLevel(SecureLogLevel.X)	logService.setLevel(LogService.Level.X)
secureLog.getFiles()	logService.getFiles()
secureLog.deleteFiles()	logService.deleteFiles()