[5.8] Adds the ability to set the reconnector created by a DatabaseManager.

[iainconnor]

Implements laravel/ideas#1557.

Our current use-case for wanting to customize the reconnector is wanting to add a "maximum retries" setting. When experiencing some edge-case database issues, they were exacerbated by the default reconnector "infinitely" trying to reconnect (infinitely in quotes because eventually something times out, but still has the tendency to turn a minor blip into a feedback loop).

[taylorotwell]

So, in a service provider, what prevents you from doing something like: DB::connection('foo')->setReconnector($reconnector)... that method is already public? Maybe even something like this in a boot method of a service provider so it's only run when the DB manager is actually resolved (it's bound as "db" in the container):

$this->app->resolved('db', function ($db) {
    $db->connection('foo')->setReconnector(fn);
});

[iainconnor]

I have multiple connections, so I'd need to iterate through (and configure) all of them in this block of code, when any given request may not actually utilize (and thus not have to configure) those connections.

Yes, the overhead of the configuration is (relatively) minor, but still unnecessary until I actually need to perform a query against the Db.