List discoverContainers()

in containers-docker-local/src/main/java/org/apache/aries/containers/docker/local/impl/LocalDockerServiceManager.java [188:234]
42 lines of code
12 McCabe index (conditional complexity)

    List<ContainerImpl> discoverContainers(ServiceConfig config) throws IOException {
        List<ContainerImpl> res = new ArrayList<>();
        List<String> ids = getDockerIDs(config);
        if (ids.size() == 0)
            return Collections.emptyList();

        String infoJSON = docker.inspect(ids);
        List<Object> data = new JSONParser(infoJSON).getParsedList();
        for (Object d : data) {
            if (!(d instanceof Map))
                continue;

            Map m = (Map) d;
            Object ns = m.get("NetworkSettings");
            Map<Integer, Integer> ports = new HashMap<>();
            if (ns instanceof Map) {
                Object pd = ((Map) ns).get("Ports");
                if (pd instanceof Map) {
                    Map pm = (Map) pd;
                    for(Map.Entry entry : (Set<Map.Entry>) pm.entrySet()) {
                        try {
                            String key = entry.getKey().toString();
                            int idx = key.indexOf('/');
                            if (idx > 0)
                                key = key.substring(0, idx);
                            int containerPort = Integer.parseInt(key);
                            int hostPort = -1;
                            for (Object val : (List) entry.getValue()) {
                                if (val instanceof Map) {
                                    hostPort = Integer.parseInt(((Map) val).get("HostPort").toString());
                                }
                            }

                            if (hostPort != -1) {
                                ports.put(containerPort, hostPort);
                            }
                        } catch (Exception nfe) {
                            // ignore parsing exceptions, try next one
                        }
                    }
                }
            }
            // TODO check that the settings match!
            res.add(new ContainerImpl(m.get("Id").toString(), LocalDockerServiceManager.getContainerHost(), ports));
        }
        return res;
    }