Re: recovery modules

On Tue, Jan 31, 2023 at 08:13:11AM +0900, Michael Paquier wrote:
> On Mon, Jan 30, 2023 at 12:04:22PM -0800, Nathan Bossart wrote:
>> On Mon, Jan 30, 2023 at 11:48:10AM -0800, Andres Freund wrote:
>>> I don't think _PG_archive_module_init() should actually allocate a memory
>>> context and do other similar initializations. Instead it should just return
>>> 'const ArchiveModuleCallbacks*', typically a single line.
>>>
>>> Allocations etc should happen in one of the callbacks. That way we can
>>> actually have multiple instances of a module.
>>
>> I think we'd need to invent a startup callback for archive modules for this
>> to work, but that's easy enough.
>
> If you don't return some (void *) pointing to a private area that
> would be stored by the backend, allocated as part of the loading path,
> I agree that an extra callback is what makes the most sense,
> presumably called around the beginning of PgArchiverMain(). Doing
> this kind of one-time action in the file callback woud be weird..

Okay, here is a new patch set with the aforementioned adjustments and
documentation updates.

--
Nathan Bossart
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