No, use anycast or VRRP/CARP for Postgres servers. Use a watchdog script to monitor for master failure. When it fails, the secondary/slave IP becomes live. Watchdog script should take necessary action to make it recognize it is master/writable. Clients don't have to know what happened.

Bringing the master back live and making it primary is a more difficult task. I would not want to automate this anyway as it would be too easy to shoot your foot off.