Question: How do I make an inter_canister call from the post upgrade hook?

[paulyoung]

This has come up in other threads too:

Cross-canister compatible Post-Init hook

TLDR; Would a post-init hook that allows cross-canister calls be beneficial? I have a need to make a cross-canister call one time, at canister initialization (see this post). However, neither the init method nor the post-upgrade method allow for cross-canister calls. As a result I have to find another way to kick this off. Current possible solutions include: Using heartbeat Exposing a separate dedicated canister method Using the new timer API The heartbeat method would be too expensive. H…

I think @icme was proposing that there could be new lifecycle hooks for this purpose:

Canister Lifecycle Hooks

A lifecycle hook or method is a common way of allowing developers a passive way to tie into and handle the occurrence of specific and important events. In the context of React and Angular, lifecycle hooks allow developers to tie into a component mounting or state changes, and in the context of AWS EC2 these hooks are triggered when auto-scaling an instance. On the IC, developers are currently able to actively interact with canisters but are limited in their ability to passively tie into specifi…