Method getHeight

src/node/interfaces.cpp:458–467

public:
    explicit ChainImpl(NodeContext& node) : m_node(node) {}
    std::optional<int> getHeight() override
    {
        LOCK(::cs_main);
        const CChain& active = Assert(m_node.chainman)->ActiveChain();
        int height = active.Height();
        if (height >= 0) {
            return height;
        }
        return std::nullopt;
    }
    uint256 getBlockHash(int height) override
    {
        LOCK(::cs_main);