How to instruct predis to continue on error

Question

In case of Redis failure, is that possible to instruct php predis (https://github.com/nrk/predis) to continue and to not die?

I have Redis to handle application cache, but the application can run without cache, it just hits the database heavier. I prefer to fallback to database then have the application dying. I cant find a way to instruct predis to continue on fail.

I thought in set the connection limit to about 5 seconds, if it cant connect to Redis the application should go on.

Is this possible?

Fatal error: Uncaught Predis\Connection\ConnectionException: Operation timed out [tcp://128.0.0.1:6379]

Answer 1

You can catch the connection exception and fallback to your database. Example:

try {
    return $predis->get('foobar');
} catch(\Predis\Connection\ConnectionException $ex) {
    // fallback to database call
}

For cleaner code wrap the database/redis call in a new class that abstracts away the actual connection, that way your calling code doesn't need to care which datasource was used.