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{WIP} Implement on_primary hooks. #958

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{WIP} Implement on_primary hooks. #958

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Commits on Apr 28, 2023

  1. Implement on_primary hooks. 

    This allows users of pg_auto_failover to setup their own scripts/actions to
complement a failover. The hooks are run in a process that is separate from
the main FSM, so as to prevent the system from making progress.

As a result, it's not possible for the hooks to change how things are
implemented in pg_auto_failover itself.

The hook system also allows running a user-defined "service", which is a
long running process or a deamon that belongs to pg_autoctl process tree.

 - [x] Implement a new internal service for running user-defined hooks
 - [ ] Implement pg_autoctl enable|disable run-hooks
 - [ ] Implement pg_autoctl create listener
 - [ ] Implement support for running script/commands (man system)
 - [ ] Add unit testing support for user-defined hooks
 - [ ] Document the new hook system, including tutorial
 - [ ] Add documentation examples covering pgbouncer as a hooked system
    @DimCitus
    DimCitus committed Apr 28, 2023
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