$$ \newcommand \PSfunction {\textbf{function }} \newcommand \PSreturn {\textbf{return }} \newcommand \PSendfunction {\textbf{end function}} \newcommand \PSswitch {\textbf{switch }} \newcommand \PScase {\textbf{case }} \newcommand \PSdefault {\textbf{default}} \newcommand \PSendswitch {\textbf{end switch}} \newcommand \PSfor {\textbf{for }} \newcommand \PSendfor {\textbf{end for}} \newcommand \PSwhile {\textbf{while }} \newcommand \PSendwhile {\textbf{end while}} \newcommand \PSdo {\textbf{ do}} \newcommand \PSif {\textbf{if }} \newcommand \PSelseif {\textbf{else if }} \newcommand \PSelse {\textbf{else}} \newcommand \PSthen {\textbf{ then}} \newcommand \PSendif {\textbf{end if}} \newcommand \PSnot {\textbf{not }} \newcommand \PScomment {\qquad \small \textsf} $$

$$ \newcommand \Node {\mathrm{node}} \newcommand \FollowerNode {\mathrm{FollowerlNode}} \newcommand \Stop {\mathrm{Stop}} \newcommand \Handlers {\mathrm{Handlers}} \newcommand \Network {\mathrm{Network}} \newcommand \Config {\mathrm{nodeConfig}} \newcommand \Catchup {\mathrm{Catchup}} \newcommand \Catchpoint {\mathrm{Catchpoint}} \newcommand \Service {\mathrm{Service}} \newcommand \Block {\mathrm{Block}} \newcommand \Auth {\mathrm{Authenticator}} \newcommand \CryptoPool {\mathrm{CryptoPool}} $$

Shutdown Follower Node

The following pseudocode describes how a node running in Follower Node mode is gracefully shutdown.

The shutdown procedure ensures that all services are stopped and resources are properly deallocated. This prevents data corruption and ensures the node stops in a stable and predictable state.

\( \textbf{Algorithm 4} \text{: Follower Node Shutdown} \)

$$ \begin{aligned} &\text{1: } \PSfunction \FollowerNode.\Stop() \\ &\text{2: } \PScomment{Network Cleanup} \\ &\text{3: } \quad \Node.\Network.\Stop\Handlers() \\ &\text{4: } \quad \PSif \neg \Node.\Config.\Stop\Network \PSthen \\ &\text{5: } \quad \quad \Node.\Network.\Stop() \\ &\text{6: } \quad \PSendif \\ &\text{7: } \PScomment{Service Shutdown} \\ &\text{8: } \quad \PSif \exists \Node.\Catchpoint\Catchup\Service \PSthen \\ &\text{9: } \quad \quad \Node.\Catchpoint\Catchup\Service.\Stop() \\ &\text{10:} \quad \PSelse \\ &\text{11:} \PScomment{Follower Services Only} \\ &\text{12:} \quad \quad \Node.\Catchup\Service.\Stop() \\ &\text{13:} \quad \quad \Node.\Block\Service.\Stop() \\ &\text{14:} \quad \PSendif \\ &\text{15:} \PScomment{Resource Cleanup} \\ &\text{16:} \quad \Node.\Catchup.\Block\Auth.\Stop() \\ &\text{17:} \quad \Node.\CryptoPool.\mathrm{lowPriority}.\Stop() \\ &\text{18:} \quad \Node.\CryptoPool.\Stop() \\ &\text{19:} \PSendfunction \end{aligned} $$

⚙️ IMPLEMENTATION

Follower node shutdown reference implementation.