address race condition where assemblies exist on the server but aren'…

[alpapan]

this is a defensive check to fix two issues that caused errors due to a sync and/or race condition between mongo and local storage

Error: Could not find assembly "68d645473455e153641748db" to add feature "68e7ad6ad1890725fdbfdab0"
(when adding a feature to an assembly that it can't find in its local state)

and

Error: [mobx-state-tree] You are trying to read or write to an object that is no longer part of a state tree. (Object type: 'ApolloInternetAccount', Path upon death: '/internetAccounts/0', Subpath: '', Action: '/internetAccounts/0.postUserLocation()')
(client-side state management)

[alpapan]

the error i tried to fix:

even after this commit,
i'm still getting this (more on firefox that edge):

this helped a bit
packages/jbrowse-plugin-apollo/src/ApolloInternetAccount/model.ts ~line 395

const debounceTimeout = 300
      const debouncePostUserLocation = (
        fn: (userLocation: UserLocation[]) => (Promise<void> | void),
      ) => {
        let timeoutId: ReturnType<typeof setTimeout>
        return (userLocation: UserLocation[]) => {
          clearTimeout(timeoutId)
          timeoutId = setTimeout(() => {
            if (isAlive(self)) {
              fn(userLocation)
            }
          }, debounceTimeout)
        }
      }

(generally i seem to have sync issues between client and database server - probably due to my setup - but hopefully these address it; not sure what's up)

[garrettjstevens]

The error that refers to postUserLocation was due to some event listeners not getting properly cleaned up. I've opened a PR to fix it here: #714. I'm still looking into the "Could not find assembly" error.

[garrettjstevens]

@alpapan I've been trying to reproduce the "Could not find assembly x to add feature y" error, and I know at least one other user has mentioned seeing it, but I can't get it to happen for me locally. If you have steps to reproduce it I can investigate further.

[alpapan]

I wonder if all the issues I'm having is because of using a proxy...?

[garrettjstevens]

I doubt it's the proxy, the postUserLocation error happened to me, too, without a proxy.