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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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5
src/backend/access/common/printsimple.c
View File

@@ -20,6 +20,7 @@
#include "access/printsimple.h"
#include "catalog/pg_type.h"
#include "libpq/protocol.h"
#include "libpq/pqformat.h"
#include "utils/builtins.h"
@@ -32,7 +33,7 @@ printsimple_startup(DestReceiver *self, int operation, TupleDesc tupdesc)
StringInfoData buf;
int i;
pq_beginmessage(&buf, 'T'); /* RowDescription */
pq_beginmessage(&buf, PqMsg_RowDescription);
pq_sendint16(&buf, tupdesc->natts);
for (i = 0; i < tupdesc->natts; ++i)
@@ -65,7 +66,7 @@ printsimple(TupleTableSlot *slot, DestReceiver *self)
slot_getallattrs(slot);
/* Prepare and send message */
pq_beginmessage(&buf, 'D');
pq_beginmessage(&buf, PqMsg_DataRow);
pq_sendint16(&buf, tupdesc->natts);
for (i = 0; i < tupdesc->natts; ++i)

14
src/backend/access/transam/parallel.c
View File

@@ -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);
}
/*