public BackupVerificationResult isMetaFileValid()

in priam/src/main/java/com/netflix/priam/backupv2/MetaV1Proxy.java [90:148]
44 lines of code
7 McCabe index (conditional complexity)

    public BackupVerificationResult isMetaFileValid(AbstractBackupPath metaBackupPath) {
        BackupVerificationResult result = new BackupVerificationResult();
        result.remotePath = metaBackupPath.getRemotePath();
        result.snapshotInstant = metaBackupPath.getTime().toInstant();

        try {
            // Download the meta file.
            Path metaFile = downloadMetaFile(metaBackupPath);
            // Read the local meta file.
            List<String> metaFileList = getSSTFilesFromMeta(metaFile);
            FileUtils.deleteQuietly(metaFile.toFile());
            result.manifestAvailable = true;

            // List the remote file system to validate the backup.
            String prefix = fs.getPrefix().toString();
            Date strippedMsSnapshotTime =
                    new Date(result.snapshotInstant.truncatedTo(ChronoUnit.MINUTES).toEpochMilli());
            Iterator<AbstractBackupPath> backupfiles =
                    fs.list(prefix, strippedMsSnapshotTime, strippedMsSnapshotTime);

            // Return validation fail if backup filesystem listing failed.
            if (!backupfiles.hasNext()) {
                logger.warn(
                        "ERROR: No files available while doing backup filesystem listing. Declaring the verification failed.");
                return result;
            }

            // Convert the remote listing to String.
            List<String> remoteListing = new ArrayList<>();
            while (backupfiles.hasNext()) {
                AbstractBackupPath path = backupfiles.next();
                if (path.getType() == AbstractBackupPath.BackupFileType.SNAP)
                    remoteListing.add(path.getRemotePath());
            }

            if (metaFileList.isEmpty() && remoteListing.isEmpty()) {
                logger.info(
                        "Uncommon Scenario: Both meta file and backup filesystem listing is empty. Considering this as success");
                result.valid = true;
                return result;
            }

            ArrayList<String> filesMatched =
                    (ArrayList<String>) CollectionUtils.intersection(metaFileList, remoteListing);
            result.filesMatched = filesMatched.size();
            result.filesInMetaOnly = metaFileList;
            result.filesInMetaOnly.removeAll(filesMatched);

            // There could be a scenario that backupfilesystem has more files than meta file. e.g.
            // some leftover objects
            result.valid = (result.filesInMetaOnly.isEmpty());
        } catch (Exception e) {
            logger.error(
                    "Error while processing meta file: " + metaBackupPath, e.getLocalizedMessage());
            e.printStackTrace();
        }

        return result;
    }