product-scanner
MDNS network scanner for holusion products
Example usage : see example.js.
Import
import ProductScanner from "@holusion/product-scanner";
const s = new ProductScanner(); //Defaults are usually good
API
Events
error
forwards errors from multicast-dns.
ready
emits a ready event once multicast-dns started successfully
It is necessary to wait for it before calling ProductScanner.refresh().
change
emitted each time a new node is detected or some node is updated.
Does not perform deduplication so it might get called a lot on noisy networks.
remove
Emitted with the node's host property if a node is removed, either due to timeout or graceful shutdown
Methods
refresh(ids :string, timeout:number=500)
force-refresh a list of hosts within a set time.
Everything that did not respond on time will be removed through the emission of a "remove" event.
Resolves once the timeout expires or all nodes answered.
close()
closes the scanner and the underlying multicast-dns socket if using the default one.
Improvements
- currently no difference is made between services ttl (long) and addresses ttl (short). a record-dependant refresh cycle could be established
- refresh could be improved. It currently does a broadcast instead of sending requests only to target nodes
- some "network health" statistics could be gathered to use a network-dependant value for refresh's timeout.