Retrieve unique block ID or machine name in build() method of BlockBase class

This would be very useful but doesn't seem to be possible for some inexplicable reason. Currently the best I can do is to load all the block instances of the same type and loop through them, looking for a matching label. Which seems incredibly inefficient and will break if two blocks are ever created with the same label which isn't unlikely.

Is there no sensible way to get the ID for a block given a BlockBase class instance? How about getting the Block class object from it? It seems every piece of configuration info for the block is available to BlockBase except a reference to the actual block!

I've been trying to do this as well. One workaround I've found is inside the blockSubmit method put the following:

$this->configuration['block_id'] = $form_state->getBuildInfo()['callback_object']->getEntity()->id();

Then in the build method you can access it via:

$config = $this->getConfiguration();
$blockId = $config['block_id'];

I'm interested in contributing a patch for this but I have found myself chasing ghosts while trying to figure it out. I've explored the BlockManager (for plugins), the BlockBase class and the BlockPluginTrait Is this even possible with Drupal? If so, is there a particular direction or pattern I should be following?

Moving this up to the next major version, in the meantime, the workaround in #10 does the trick. I will note that blocks need to be resaved before the new info is stored in the the configuration.

#10 seems to only work for non-Layout Builder instances. Otherwise the callback_object in layout builder does not have a getEntity() method and fails.

Edit:

For those who stumble upon this later, here's a solution that should be augmented for your use case, however, works for mine. This is in my blockSubmit() method

  if(method_exists($form_state->getBuildInfo()['callback_object'], 'getEntity')) {
      // Likely this is the stock drupal block layout config.
      $this->configuration['block_id'] = $form_state->getBuildInfo()['callback_object']->getEntity()->id();
      $this->configuration['block_offset'] = '';
    }
    else {
      /** @var \Drupal\layout_builder\Form\UpdateBlockForm */
      $callback_obj = $form_state->getBuildInfo()['callback_object'];
      // Likely this is Layout builder
      $current_component = $callback_obj->getCurrentComponent();
      $uuid = $current_component->getUuid();
      $region = $current_component->getRegion();
      $weight =  $current_component->getWeight();

      $layout_offset = $weight . '/' . $region;

      $this->configuration['block_id'] = $uuid;
      $this->configuration['block_offset'] = $layout_offset;
    }

I see that there are two solutions offered here, in #10 and #15. So, I am closing this Support Request and asking that further discussion happen outside the core issue queue.

The Drupal Core issue queue is not the ideal place for support requests (that option is mostly there for filing support issues for contributed modules and themes). There are several support options listed on our support page (Community > Support at the top of Drupal.org) and there is Drupal Slack. Drupal Slack and the Forums, which are our two main support mechanisms in the Drupal community.

Cheers