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db-postgresql.c
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db-postgresql.c
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/*
* Copyright 2011 Shane Wegner
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "autotools-config.h"
#ifdef HAVE_POSTGRESQL
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <libpq-fe.h>
#include "server.h"
#define DEFAULT_STMT_PWDB \
"SELECT password FROM pool_worker WHERE username = $1"
#define DEFAULT_STMT_SHARELOG \
"insert into shares (rem_host, username, our_result, \
upstream_result, reason, solution) values($1, $2, $3, $4, $5, decode($6, 'hex'))"
static bool pg_conncheck(void)
{
if (PQstatus(srv.db_cxn) != CONNECTION_OK) {
applog(LOG_WARNING,
"Connection to PostgreSQL lost: reconnecting.");
PQreset(srv.db_cxn);
if (PQstatus(srv.db_cxn) != CONNECTION_OK) {
applog(LOG_ERR, "Reconnect attempt failed.");
return false;
}
}
return true;
}
static char *pg_pwdb_lookup(const char *user)
{
char *pw = NULL;
PGresult *res;
const char *paramvalues[] = { user };
if (!pg_conncheck())
return NULL;
res =
PQexecParams(srv.db_cxn, srv.db_stmt_pwdb, 1, NULL,
paramvalues, NULL, NULL, 0);
if (PQresultStatus(res) != PGRES_TUPLES_OK) {
applog(LOG_ERR, "pg_pwdb_lookup query failed: %s",
PQerrorMessage(srv.db_cxn));
goto out;
}
if (PQnfields(res) != 1 || PQntuples(res) < 1)
goto out;
pw = strdup(PQgetvalue(res, 0, 0));
out:
PQclear(res);
return pw;
}
static bool pg_sharelog(const char *rem_host, const char *username,
const char *our_result,
const char *upstream_result, const char *reason,
const char *solution)
{
PGresult *res;
/* PG does a fine job with timestamps so we won't bother. */
const char *paramvalues[] = { rem_host, username, our_result,
upstream_result, reason, solution
};
if (!pg_conncheck())
return false;
res =
PQexecParams(srv.db_cxn, srv.db_stmt_sharelog, 6, NULL,
paramvalues, NULL, NULL, 0);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
applog(LOG_ERR, "pg_sharelog failed: %s",
PQerrorMessage(srv.db_cxn));
PQclear(res);
return true;
}
static void pg_close(void)
{
PQfinish(srv.db_cxn);
}
static bool pg_open(void)
{
char *portstr = NULL;
if (srv.db_port > 0)
if (asprintf(&portstr, "%d", srv.db_port) < 0)
return false;
srv.db_cxn = PQsetdbLogin(srv.db_host, portstr, NULL, NULL,
srv.db_name, srv.db_username,
srv.db_password);
free(portstr);
if (PQstatus(srv.db_cxn) != CONNECTION_OK) {
applog(LOG_ERR, "failed to connect to postgresql: %s",
PQerrorMessage(srv.db_cxn));
pg_close();
return false;
}
if (srv.db_stmt_pwdb == NULL || !*srv.db_stmt_pwdb)
srv.db_stmt_pwdb = strdup(DEFAULT_STMT_PWDB);
if (srv.db_stmt_sharelog == NULL || !*srv.db_stmt_sharelog)
srv.db_stmt_sharelog = strdup(DEFAULT_STMT_SHARELOG);
return true;
}
struct server_db_ops postgresql_db_ops = {
.pwdb_lookup = pg_pwdb_lookup,
.sharelog = pg_sharelog,
.open = pg_open,
.close = pg_close,
};
#endif