AbstractDnssdDiscoveryController.cpp

/*
 *
 *    Copyright (c) 2020 Project CHIP Authors
 *    All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

// module header, comes first
#include <controller/AbstractDnssdDiscoveryController.h>

#include <lib/core/CHIPEncoding.h>
#include <lib/support/logging/CHIPLogging.h>

namespace chip {
namespace Controller {

void AbstractDnssdDiscoveryController::OnNodeDiscovered(const chip::Dnssd::DiscoveredNodeData & nodeData)
{
    auto discoveredNodes = GetDiscoveredNodes();
    for (auto & discoveredNode : discoveredNodes)
    {
        if (!discoveredNode.resolutionData.IsValid())
        {
            continue;
        }
        // TODO(#32576) Check if IP address are the same. Must account for `numIPs` in the list of `ipAddress`.
        // Additionally, must NOT assume that the ordering is consistent.
        if (strcmp(discoveredNode.resolutionData.hostName, nodeData.resolutionData.hostName) == 0 &&
            discoveredNode.resolutionData.port == nodeData.resolutionData.port &&
            discoveredNode.resolutionData.numIPs == nodeData.resolutionData.numIPs)
        {
            discoveredNode = nodeData;
            if (mDeviceDiscoveryDelegate != nullptr)
            {
                mDeviceDiscoveryDelegate->OnDiscoveredDevice(nodeData);
            }
            return;
        }
    }
    // Node not yet in the list
    for (auto & discoveredNode : discoveredNodes)
    {
        if (!discoveredNode.resolutionData.IsValid())
        {
            discoveredNode = nodeData;
            if (mDeviceDiscoveryDelegate != nullptr)
            {
                mDeviceDiscoveryDelegate->OnDiscoveredDevice(nodeData);
            }
            return;
        }
    }
    ChipLogError(Discovery, "Failed to add discovered node with hostname %s- Insufficient space", nodeData.resolutionData.hostName);
}

CHIP_ERROR AbstractDnssdDiscoveryController::SetUpNodeDiscovery()
{
    auto discoveredNodes = GetDiscoveredNodes();
    for (auto & discoveredNode : discoveredNodes)
    {
        discoveredNode.Reset();
    }
    return CHIP_NO_ERROR;
}

const Dnssd::DiscoveredNodeData * AbstractDnssdDiscoveryController::GetDiscoveredNode(int idx)
{
    // TODO(cecille): Add assertion about main loop.
    auto discoveredNodes = GetDiscoveredNodes();
    if (0 <= idx && idx < CHIP_DEVICE_CONFIG_MAX_DISCOVERED_NODES && discoveredNodes.data()[idx].resolutionData.IsValid())
    {
        return discoveredNodes.data() + idx;
    }
    return nullptr;
}

} // namespace Controller
} // namespace chip