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Revise backend libpq interfaces so that messages to the frontend

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can be generated in a buffer and then sent to the frontend in a single
libpq call.  This solves problems with NOTICE and ERROR messages generated
in the middle of a data message or COPY OUT operation.
This commit is contained in:
Tom Lane
1999-04-25 03:19:27 +00:00
parent fc08814e00
commit 95cc41b81d
18 changed files with 1071 additions and 1028 deletions
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40
src/backend/tcop/fastpath.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/fastpath.c,v 1.22 1999/02/13 23:18:44 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/fastpath.c,v 1.23 1999/04/25 03:19:10 tgl Exp $
*
* NOTES
* This cruft is the server side of PQfn.
@ -68,6 +68,7 @@
#include "utils/builtins.h" /* for oideq */
#include "tcop/fastpath.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
#include "access/xact.h" /* for TransactionId/CommandId protos */
@ -87,32 +88,36 @@ SendFunctionResult(Oid fid, /* function id */
int retlen /* the length according to the catalogs */
)
{
pq_putnchar("V", 1);
StringInfoData buf;
pq_beginmessage(&buf);
pq_sendbyte(&buf, 'V');
if (retlen != 0)
{
pq_putnchar("G", 1);
pq_sendbyte(&buf, 'G');
if (retbyval)
{ /* by-value */
pq_putint(retlen, 4);
pq_putint((int) (Datum) retval, retlen);
pq_sendint(&buf, retlen, 4);
pq_sendint(&buf, (int) (Datum) retval, retlen);
}
else
{ /* by-reference ... */
if (retlen < 0)
{ /* ... varlena */
pq_putint(VARSIZE(retval) - VARHDRSZ, VARHDRSZ);
pq_putnchar(VARDATA(retval), VARSIZE(retval) - VARHDRSZ);
pq_sendint(&buf, VARSIZE(retval) - VARHDRSZ, VARHDRSZ);
pq_sendbytes(&buf, VARDATA(retval), VARSIZE(retval) - VARHDRSZ);
}
else
{ /* ... fixed */
pq_putint(retlen, 4);
pq_putnchar(retval, retlen);
pq_sendint(&buf, retlen, 4);
pq_sendbytes(&buf, retval, retlen);
}
}
}
pq_putnchar("0", 1);
pq_sendbyte(&buf, '0');
pq_endmessage(&buf);
}
/*
@ -276,6 +281,7 @@ HandleFunctionRequest()
Oid fid;
int argsize;
int nargs;
int tmp;
char *arg[8];
char *retval;
int i;
@ -283,8 +289,9 @@ HandleFunctionRequest()
char *p;
struct fp_info *fip;
fid = (Oid) pq_getint(4); /* function oid */
nargs = pq_getint(4); /* # of arguments */
pq_getint(&tmp, 4); /* function oid */
fid = (Oid) tmp;
pq_getint(&nargs, 4); /* # of arguments */
/*
* This is where the one-back caching is done. If you want to save
@ -311,13 +318,14 @@ HandleFunctionRequest()
arg[i] = (char *) NULL;
else
{
argsize = pq_getint(4);
pq_getint(&argsize, 4);
Assert(argsize > 0);
if (fip->argbyval[i])
{ /* by-value */
Assert(argsize <= 4);
arg[i] = (char *) pq_getint(argsize);
pq_getint(&tmp, argsize);
arg[i] = (char *) tmp;
}
else
{ /* by-reference ... */
@ -328,14 +336,14 @@ HandleFunctionRequest()
* 98 Jan 6 */
elog(ERROR, "HandleFunctionRequest: palloc failed");
VARSIZE(p) = argsize + VARHDRSZ;
pq_getnchar(VARDATA(p), 0, argsize);
pq_getbytes(VARDATA(p), argsize);
}
else
{ /* ... fixed */
/* XXX cross our fingers and trust "argsize" */
if (!(p = palloc(argsize + 1)))
elog(ERROR, "HandleFunctionRequest: palloc failed");
pq_getnchar(p, 0, argsize);
pq_getbytes(p, argsize);
}
palloced |= (1 << i);
arg[i] = p;