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Commit2193beb

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Further thoughts about lo_export/lo_import error handling: if one of
the lower-level large object functions fails, it will have already seta suitable error message --- probably something from the backend ---and it is not useful to overwrite that with a generic 'error whilereading large object' message. So remove redundant messages.
1 parentf3164c0 commit2193beb

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1 file changed

+20
-28
lines changed

1 file changed

+20
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lines changed

‎src/interfaces/libpq/fe-lobj.c‎

Lines changed: 20 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-lobj.c,v 1.57 2006/06/1401:28:55 tgl Exp $
11+
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-lobj.c,v 1.58 2006/06/1417:49:25 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -32,7 +32,6 @@
3232

3333
#include<fcntl.h>
3434
#include<sys/stat.h>
35-
#include<errno.h>
3635

3736
#include"libpq-fe.h"
3837
#include"libpq-int.h"
@@ -458,19 +457,15 @@ lo_import(PGconn *conn, const char *filename)
458457
lobjOid=lo_creat(conn,INV_READ |INV_WRITE);
459458
if (lobjOid==InvalidOid)
460459
{
461-
printfPQExpBuffer(&conn->errorMessage,
462-
libpq_gettext("could not create large object for file \"%s\"\n"),
463-
filename);
460+
/* we assume lo_creat() already set a suitable error message */
464461
(void)close(fd);
465462
returnInvalidOid;
466463
}
467464

468465
lobj=lo_open(conn,lobjOid,INV_WRITE);
469466
if (lobj==-1)
470467
{
471-
printfPQExpBuffer(&conn->errorMessage,
472-
libpq_gettext("could not open large object %u\n"),
473-
lobjOid);
468+
/* we assume lo_open() already set a suitable error message */
474469
(void)close(fd);
475470
returnInvalidOid;
476471
}
@@ -484,16 +479,11 @@ lo_import(PGconn *conn, const char *filename)
484479
if (tmp!=nbytes)
485480
{
486481
/*
487-
* Ifthelo_write failed, we areprobably in an aborted
488-
*transaction andsolo_close will fail. Try it anyway for
489-
*cleanliness, but don't let it determinethereturned error
490-
*message.
482+
* If lo_write() failed, we arenow in an aborted transaction
483+
* sothere's no need for lo_close(); furthermore, if we tried
484+
*it we'd overwritetheuseful error result with a useless one.
485+
*So just nail the doors shut and get out of town.
491486
*/
492-
(void)lo_close(conn,lobj);
493-
494-
printfPQExpBuffer(&conn->errorMessage,
495-
libpq_gettext("error while writing large object %u\n"),
496-
lobjOid);
497487
(void)close(fd);
498488
returnInvalidOid;
499489
}
@@ -511,9 +501,7 @@ lo_import(PGconn *conn, const char *filename)
511501

512502
if (lo_close(conn,lobj)!=0)
513503
{
514-
printfPQExpBuffer(&conn->errorMessage,
515-
libpq_gettext("error while writing large object %u\n"),
516-
lobjOid);
504+
/* we assume lo_close() already set a suitable error message */
517505
returnInvalidOid;
518506
}
519507

@@ -542,8 +530,7 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
542530
lobj=lo_open(conn,lobjId,INV_READ);
543531
if (lobj==-1)
544532
{
545-
printfPQExpBuffer(&conn->errorMessage,
546-
libpq_gettext("could not open large object %u\n"),lobjId);
533+
/* we assume lo_open() already set a suitable error message */
547534
return-1;
548535
}
549536

@@ -569,26 +556,31 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
569556
if (tmp!=nbytes)
570557
{
571558
printfPQExpBuffer(&conn->errorMessage,
572-
libpq_gettext("error while writing to file \"%s\": %s\n"),
559+
libpq_gettext("could not write to file \"%s\": %s\n"),
573560
filename,pqStrerror(errno,sebuf,sizeof(sebuf)));
574561
(void)lo_close(conn,lobj);
575562
(void)close(fd);
576563
return-1;
577564
}
578565
}
579566

580-
if (lo_close(conn,lobj)!=0||nbytes<0)
567+
/*
568+
* If lo_read() failed, we are now in an aborted transaction
569+
* so there's no need for lo_close(); furthermore, if we tried
570+
* it we'd overwrite the useful error result with a useless one.
571+
* So skip lo_close() if we got a failure result.
572+
*/
573+
if (nbytes<0||
574+
lo_close(conn,lobj)!=0)
581575
{
582-
printfPQExpBuffer(&conn->errorMessage,
583-
libpq_gettext("error while reading large object %u\n"),
584-
lobjId);
576+
/* assume lo_read() or lo_close() left a suitable error message */
585577
result=-1;
586578
}
587579

588580
if (close(fd))
589581
{
590582
printfPQExpBuffer(&conn->errorMessage,
591-
libpq_gettext("error while writing to file \"%s\": %s\n"),
583+
libpq_gettext("could not write to file \"%s\": %s\n"),
592584
filename,pqStrerror(errno,sebuf,sizeof(sebuf)));
593585
result=-1;
594586
}

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