Add Last Seen Time For Disconnected Node

[m-janos]

• I have searched the issues of this repository and believe that this is not a duplicate.

Summary 💡

• When Multichain node is disconnected, display last active timestamp
• Find the way how to retrieve the time value
• Screen --> component: e.g. http://localhost:3000/nodes --> Network

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• Process runs every 24H on every API

• check if chain connection/permission ready (this applies to not yet connected nodes, on which logging should not even run)

• getpeerinfo issued from api returns an array of connected nodes

• process the array (we do not need all the information)

• Create an event e.g. store_network_infromation or such

• Condition: Check if the event for that day is written in the stream

• if not, store the event in stream

• YYYYMMDD as key

• possibly use addresses of nodes as additional keys?

• use also the address of publishing node in keys

• which stream? events in "nodes" are expected to have certain structure and function (get in Nodes.ts) => consult with Stefan (using network_log atm)

• all nodes registered in the chain are in the nodes stream. if some of these nodes are not connected to the chain (getpeerinfo returns array with some of them missing), API should take care of this -> look in the stream when was that particular node last seen, and include the information in the reply to frontend

• Frontend gets the information from API - maybe piggyback response in such a way that no breaking change occurs?

Parent Task 🔗

• Add connection status to network list - 8SP #746