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Introduce macros for protocol characters.

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This commit introduces descriptively-named macros for the
identifiers used in wire protocol messages.  These new macros are
placed in a new header file so that they can be easily used by
third-party code.

Author: Dave Cramer
Reviewed-by: Alvaro Herrera, Tatsuo Ishii, Peter Smith, Robert Haas, Tom Lane, Peter Eisentraut, Michael Paquier
Discussion: https://postgr.es/m/CADK3HHKbBmK-PKf1bPNFoMC%2BoBt%2BpD9PH8h5nvmBQskEHm-Ehw%40mail.gmail.com
This commit is contained in:
Nathan Bossart
2023-08-22 19:16:12 -07:00
parent 7114791158
commit f4b54e1ed9
25 changed files with 305 additions and 204 deletions
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14
src/backend/access/transam/parallel.c
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@@ -1127,7 +1127,7 @@ HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
switch (msgtype)
{
case 'K': /* BackendKeyData */
case PqMsg_BackendKeyData:
{
int32 pid = pq_getmsgint(msg, 4);
@@ -1137,8 +1137,8 @@ HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
break;
}
case 'E': /* ErrorResponse */
case 'N': /* NoticeResponse */
case PqMsg_ErrorResponse:
case PqMsg_NoticeResponse:
{
ErrorData edata;
ErrorContextCallback *save_error_context_stack;
@@ -1183,7 +1183,7 @@ HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
break;
}
case 'A': /* NotifyResponse */
case PqMsg_NotificationResponse:
{
/* Propagate NotifyResponse. */
int32 pid;
@@ -1217,7 +1217,7 @@ HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
break;
}
case 'X': /* Terminate, indicating clean exit */
case PqMsg_Terminate:
{
shm_mq_detach(pcxt->worker[i].error_mqh);
pcxt->worker[i].error_mqh = NULL;
@@ -1372,7 +1372,7 @@ ParallelWorkerMain(Datum main_arg)
* protocol message is defined, but it won't actually be used for anything
* in this case.
*/
pq_beginmessage(&msgbuf, 'K');
pq_beginmessage(&msgbuf, PqMsg_BackendKeyData);
pq_sendint32(&msgbuf, (int32) MyProcPid);
pq_sendint32(&msgbuf, (int32) MyCancelKey);
pq_endmessage(&msgbuf);
@@ -1550,7 +1550,7 @@ ParallelWorkerMain(Datum main_arg)
DetachSession();
/* Report success. */
pq_putmessage('X', NULL, 0);
pq_putmessage(PqMsg_Terminate, NULL, 0);
}
/*