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Michael Paquier 35739b87dc Redesign archive modules ... A new callback named startup_cb, called shortly after a module is loaded, is added. This makes possible the initialization of any additional state data required by a module. This initial state data can be saved in a ArchiveModuleState, that is now passed down to all the callbacks that can be defined in a module. With this design, it is possible to have a per-module state, aimed at opening the door to the support of more than one archive module. The initialization of the callbacks is changed so as _PG_archive_module_init() does not anymore give in input a ArchiveModuleCallbacks that a module has to fill in with callback definitions. Instead, a module now needs to return a const ArchiveModuleCallbacks. All the structure and callback definitions of archive modules are moved into their own header, named archive_module.h, from pgarch.h. Command-based archiving follows the same line, with a new set of files named shell_archive.{c,h}. There are a few more items that are under discussion to improve the design of archive modules, like the fact that basic_archive calls sigsetjmp() by itself to define its own error handling flow. These will be adjusted later, the changes done here cover already a good portion of what has been discussed. Any modules created for v15 will need to be adjusted to this new design. Author: Nathan Bossart Reviewed-by: Andres Freund Discussion: https://postgr.es/m/20230130194810.6fztfgbn32e7qarj@awork3.anarazel.de		3 years ago
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expected	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago
sql	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago
.gitignore	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago
Makefile	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago
basic_archive.c	Redesign archive modules	3 years ago
basic_archive.conf	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago
meson.build	Revert "Rename contrib module basic_archive to basic_wal_module"	3 years ago