Server side rendering with getRunningOperationPromises

Hi

I’ve try to take a look at the ssr-experiment exemple here:

• https://github.com/JulienKode/ssr-experiments/pull/new/chore/demo
• https://codesandbox.io/s/naughty-robinson-47e9jt?file=/package.json

I’ve:

• added console log on getRunningOperationPromises
• Create a fake long query (10s)
• try to fetch with few seconds of delay the two pages:
  • http://localhost:3000/pokemon/ssr/bulbasaur
  • http://localhost:3000/pokemon/ssr/beedrill

On the beedrill fetch this is what I can see when displaying running promises:

{
"getPokemonByName(\"beedrill\")": {
  "arg": "beedrill",
  "requestId": "070QxaL_aSi7MV3VbQzDQ",
  "queryCacheKey": "getPokemonByName(\"beedrill\")"
},
"getPokemonByName(\"bulbasaur\")": {
  "arg": "bulbasaur",
  "requestId": "FdsRw3PmBbDP5sR7-kKPe",
  "queryCacheKey": "getPokemonByName(\"bulbasaur\")"
}
}

• Is it normal that we are waiting for bulbasaur when our page are just concern about beedrill ?
• Should the runningPromises created in the api be unique to each page and not sharing across different page ? otherwise on large scale apps this could be an issue if we are waiting for the queries of another page
• Does the runningPromises should be isolated to each page on SSR ?
• like createListenerMiddleware should we have a createApiMiddleware ? Then on server side, we can have a different middleware instance for each page that does not share values

This is the debug line that I’ve added in redux:

  function getRunningOperationPromises() {
    console.warn("[DEBUG] RUNNING OPERATION PROMISES ", {runningQueries})
    console.warn(JSON.stringify(runningQueries, null, 2))

@phryneas @markerikson

[phryneas]

Good observation - this should be scoped per store instance. Could be difficult though as it is outside of a middleware 🤔

[phryneas]

This will still take some time until it makes in - we’ll have to carefully weigh if and how we can break the existing implementation - since the new one would have to be dispatched. I know the old api was just plain wrong, but we’ll have to discuss this quite a lot.

You can isntall the PR-patched package from the CodeSandbox registry in the meantime though.