public String getContainerId()

in aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/utils/DockerUtils.java [65:98]

30 lines of code
7 McCabe index (conditional complexity)


    public String getContainerId() throws IOException {
        if (cgroupLocation == null) {
            return null;
        }

        final File procFile;
        try {
            procFile = new File(cgroupLocation.toURI());
        } catch (URISyntaxException e) {
            logger.warn("Failed to read container ID because " + cgroupLocation.toString() + " didn't contain an ID.");
            return null;
        }

        if (procFile.exists()) {
            try (InputStream inputStream = new FileInputStream(procFile);
                 BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
                String line;
                do {
                    line = reader.readLine();

                    if (line == null) {
                        logger.warn("Failed to read container ID because " + cgroupLocation.toString()
                                    + " didn't contain an ID.");
                    } else if (line.length() > CONTAINER_ID_LENGTH) {
                        return line.substring(line.length() - CONTAINER_ID_LENGTH);
                    }
                } while (line != null);
            }
        } else {
            logger.warn("Failed to read container ID because " + cgroupLocation.toString() + " does not exist.");
        }

        return null;
    }