The workers are genservers with a struct as the state. I want to fetch a subset of the struct fields from every worker.
defmodule State do
defstruct id: nil,
map_id: nil,
participants: [],
status: :active,
start_time: nil,
...more fields
end
On the liveview I want to show the start time, status and participants of every worker process.
Participants is a list of some structs with >32 fields each
How often do you query this info? How often does this subset of state change? Do you want to see changes to this state in live view automatically or only on user-initiated update?
This will be queried when the liveview mounts so whenever a user visits the page (hopefully many users in the future but currently just me), then receiving updates preferably as live as possible but it’s not strictly necessary, current implementation is doing 1 update per second and it’s good enough.
On the worker side, the genserver state is being updated 1 to 10 times a second, possibly higher in the future.
You could implement a get_state call and retrieve only the part of the state You are interested in.
And because You start with the same supervisor, You can have a list of all children processes, and derive state.
That’s okay, but it loads the workers
That’s a great use-case for phoenix pubsub. LiveViews subscribe to update events, and workers just publish the messages
It might make sense to introduce throttling in the workers. I mean publish only one update event in a second and only if a change occurs.