The triplestore.deleteOrphanBlankNodes action is very slow on big datasets

[srosset81]

When calling the ldp.remote.store, we call the triplestore.deleteOrphanBlankNodes action without waiting for it, but the Fuseki query is very long (the bigger the dataset, the longer it is) and it blocks all following requests.

semapps/src/middleware/packages/ldp/services/remote/actions/store.ts

Line 81 in 257e678

ctx.call('triplestore.deleteOrphanBlankNodes', {

This code to delete orphan blank nodes is already deleted in the WIP SemApps 2.0 branch, because now that all triples are stored in separate graphs, it's much easier to delete them all.

But until we switch to SemApps 2.0, I suggest to remove the calls to this action and it should much improve the performances.

[srosset81]

Since applications are using old versions of SemApps, and I don't want to update them all, the following middleware can be used to skip all triplestore.deleteOrphanBlankNodes calls:

const SkipOrphanBlankNodesCleanupMiddleware = () => ({
  name: 'SkipOrphanBlankNodesCleanupMiddleware',
  localAction: (next, action) => {
    if (action.name === 'triplestore.deleteOrphanBlankNodes') {
      return async ctx => {};
    } else {
      return next;
    }
  }
});