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Copy and store addrinfo in libpq-owned private memory

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This refactors libpq to copy addrinfos returned by getaddrinfo to
memory owned by libpq such that future improvements can alter for
example the order of entries.

As a nice side effect of this refactor the mechanism for iteration
over addresses in PQconnectPoll is now identical to its iteration
over hosts.

Author: Jelte Fennema <postgres@jeltef.nl>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Michael Banck <mbanck@gmx.net>
Reviewed-by: Andrey Borodin <amborodin86@gmail.com>
Discussion: https://postgr.es/m/PR3PR83MB04768E2FF04818EEB2179949F7A69@PR3PR83MB0476.EURPRD83.prod.outlook.com
This commit is contained in:
Daniel Gustafsson
2023-03-29 21:41:27 +02:00
parent 8e5eef50c5
commit 44d85ba5a3
4 changed files with 92 additions and 34 deletions
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7
src/interfaces/libpq/libpq-int.h
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@@ -471,9 +471,10 @@ struct pg_conn
PGTargetServerType target_server_type; /* desired session properties */
bool try_next_addr; /* time to advance to next address/host? */
bool try_next_host; /* time to advance to next connhost[]? */
struct addrinfo *addrlist; /* list of addresses for current connhost */
struct addrinfo *addr_cur; /* the one currently being tried */
int addrlist_family; /* needed to know how to free addrlist */
int naddr; /* number of addresses returned by getaddrinfo */
int whichaddr; /* the address currently being tried */
AddrInfo *addr; /* the array of addresses for the currently
* tried host */
bool send_appname; /* okay to send application_name? */
/* Miscellaneous stuff */