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Add libpq connection timeout parameter.

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Denis A Ustimenko
This commit is contained in:
Bruce Momjian 2002-08-17 12:33:18 +00:00
parent b7214a877c
commit f0ed4311b6
4 changed files with 97 additions and 9 deletions
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11
doc/src/sgml/libpq.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.92 2002/08/15 03:00:59 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.93 2002/08/17 12:33:17 momjian Exp $
-->
<chapter id="libpq">
@ -171,6 +171,15 @@ PGconn *PQconnectdb(const char *conninfo)
</listitem>
</varlistentry>
<varlistentry>
<term><literal>connect_timeout</literal></term>
<listitem>
<para>
Time space in seconds given to connect routine. Zero or not set means infinite.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>options</literal></term>
<listitem>

66
src/interfaces/libpq/fe-connect.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.191 2002/08/15 02:56:19 momjian Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.192 2002/08/17 12:33:17 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -110,6 +110,9 @@ static const PQconninfoOption PQconninfoOptions[] = {
{"password", "PGPASSWORD", DefaultPassword, NULL,
"Database-Password", "*", 20},
{"connect_timeout", "PGCONNECT_TIMEOUT", NULL, NULL,
"Connect-timeout", "", 10}, /* strlen( INT32_MAX) == 10 */
{"dbname", "PGDATABASE", NULL, NULL,
"Database-Name", "", 20},
@ -302,6 +305,8 @@ PQconnectStart(const char *conninfo)
conn->pguser = tmp ? strdup(tmp) : NULL;
tmp = conninfo_getval(connOptions, "password");
conn->pgpass = tmp ? strdup(tmp) : NULL;
tmp = conninfo_getval(connOptions, "connect_timeout");
conn->connect_timeout = tmp ? strdup(tmp) : NULL;
#ifdef USE_SSL
tmp = conninfo_getval(connOptions, "requiressl");
if (tmp && tmp[0] == '1')
@ -1052,12 +1057,39 @@ connectDBComplete(PGconn *conn)
{
PostgresPollingStatusType flag = PGRES_POLLING_WRITING;
struct timeval remains, *rp = NULL, finish_time, start_time;
if (conn == NULL || conn->status == CONNECTION_BAD)
return 0;
for (;;)
/*
* Prepare to time calculations, if connect_timeout isn't zero.
*/
if (conn->connect_timeout != NULL)
{
remains.tv_sec = atoi(conn->connect_timeout);
if (!remains.tv_sec)
{
conn->status = CONNECTION_BAD;
return 0;
}
remains.tv_usec = 0;
rp = &remains;
}
while (NULL == rp || remains.tv_sec > 0 || remains.tv_sec == 0 && remains.tv_usec > 0)
{
/*
* If connecting timeout is set, get current time.
*/
if ( NULL != rp && -1 == gettimeofday(&start_time, NULL))
{
conn->status = CONNECTION_BAD;
return 0;
}
/*
* Wait, if necessary. Note that the initial state (just after
* PQconnectStart) is to wait for the socket to select for
* writing.
@ -1071,7 +1103,7 @@ connectDBComplete(PGconn *conn)
return 1; /* success! */
case PGRES_POLLING_READING:
if (pqWait(1, 0, conn))
if (pqWaitTimed(1, 0, conn, rp))
{
conn->status = CONNECTION_BAD;
return 0;
@ -1079,7 +1111,7 @@ connectDBComplete(PGconn *conn)
break;
case PGRES_POLLING_WRITING:
if (pqWait(0, 1, conn))
if (pqWaitTimed(0, 1, conn, rp))
{
conn->status = CONNECTION_BAD;
return 0;
@ -1096,7 +1128,31 @@ connectDBComplete(PGconn *conn)
* Now try to advance the state machine.
*/
flag = PQconnectPoll(conn);
/*
* If connecting timeout is set, calculate remain time.
*/
if (NULL != rp) {
if (-1 == gettimeofday(&finish_time, NULL))
{
conn->status = CONNECTION_BAD;
return 0;
}
if (0 > (finish_time.tv_usec -= start_time.tv_usec))
{
remains.tv_sec++;
finish_time.tv_usec += 1000000;
}
if (0 > (remains.tv_usec -= finish_time.tv_usec))
{
remains.tv_sec--;
remains.tv_usec += 1000000;
}
remains.tv_sec -= finish_time.tv_sec - start_time.tv_sec;
}
}
conn->status = CONNECTION_BAD;
return 0;
}
/* ----------------
@ -1928,6 +1984,8 @@ freePGconn(PGconn *conn)
free(conn->pguser);
if (conn->pgpass)
free(conn->pgpass);
if (conn->connect_timeout)
free(conn->connect_timeout);
/* Note that conn->Pfdebug is not ours to close or free */
if (conn->notifyList)
DLFreeList(conn->notifyList);

24
src/interfaces/libpq/fe-misc.c
View File

@ -25,7 +25,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.76 2002/06/20 20:29:54 momjian Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.77 2002/08/17 12:33:18 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -775,11 +775,20 @@ pqFlush(PGconn *conn)
*/
int
pqWait(int forRead, int forWrite, PGconn *conn)
{
return pqWaitTimed( forRead, forWrite, conn, (const struct timeval *) NULL);
}
int
pqWaitTimed(int forRead, int forWrite, PGconn *conn, const struct timeval *timeout)
{
fd_set input_mask;
fd_set output_mask;
fd_set except_mask;
struct timeval tmp_timeout;
struct timeval *ptmp_timeout = NULL;
if (conn->sock < 0)
{
printfPQExpBuffer(&conn->errorMessage,
@ -807,9 +816,18 @@ retry5:
if (forWrite)
FD_SET(conn->sock, &output_mask);
FD_SET(conn->sock, &except_mask);
if (select(conn->sock + 1, &input_mask, &output_mask, &except_mask,
(struct timeval *) NULL) < 0)
if (NULL != timeout)
{
/*
* select may modify timeout argument on some platforms use copy
*/
tmp_timeout = *timeout;
ptmp_timeout = &tmp_timeout;
}
if (select(conn->sock + 1, &input_mask, &output_mask,
&except_mask, ptmp_timeout) < 0)
{
if (SOCK_ERRNO == EINTR)
goto retry5;
printfPQExpBuffer(&conn->errorMessage,

5
src/interfaces/libpq/libpq-int.h
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: libpq-int.h,v 1.52 2002/07/20 05:43:31 momjian Exp $
* $Id: libpq-int.h,v 1.53 2002/08/17 12:33:18 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -286,6 +286,8 @@ struct pg_conn
PQExpBufferData workBuffer; /* expansible string */
int client_encoding; /* encoding id */
char *connect_timeout;
};
/* String descriptions of the ExecStatusTypes.
@ -332,6 +334,7 @@ extern int pqReadData(PGconn *conn);
extern int pqFlush(PGconn *conn);
extern int pqSendSome(PGconn *conn);
extern int pqWait(int forRead, int forWrite, PGconn *conn);
extern int pqWaitTimed(int forRead, int forWrite, PGconn *conn, const struct timeval* timeout);
extern int pqReadReady(PGconn *conn);
extern int pqWriteReady(PGconn *conn);