forked from collectd/collectd
/
postgresql.c
1360 lines (1084 loc) · 32.5 KB
/
postgresql.c
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/**
* collectd - src/postgresql.c
* Copyright (C) 2008-2012 Sebastian Harl
* Copyright (C) 2009 Florian Forster
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Authors:
* Sebastian Harl <sh at tokkee.org>
* Florian Forster <octo at verplant.org>
**/
/*
* This module collects PostgreSQL database statistics.
*/
#include "collectd.h"
#include "common.h"
#include "configfile.h"
#include "plugin.h"
#include "utils_cache.h"
#include "utils_db_query.h"
#include "utils_complain.h"
#if HAVE_PTHREAD_H
# include <pthread.h>
#endif
#include <pg_config_manual.h>
#include <libpq-fe.h>
#define log_err(...) ERROR ("postgresql: " __VA_ARGS__)
#define log_warn(...) WARNING ("postgresql: " __VA_ARGS__)
#define log_info(...) INFO ("postgresql: " __VA_ARGS__)
#define log_debug(...) DEBUG ("postgresql: " __VA_ARGS__)
#ifndef C_PSQL_DEFAULT_CONF
# define C_PSQL_DEFAULT_CONF PKGDATADIR "/postgresql_default.conf"
#endif
/* Appends the (parameter, value) pair to the string
* pointed to by 'buf' suitable to be used as argument
* for PQconnectdb(). If value equals NULL, the pair
* is ignored. */
#define C_PSQL_PAR_APPEND(buf, buf_len, parameter, value) \
if ((0 < (buf_len)) && (NULL != (value)) && ('\0' != *(value))) { \
int s = ssnprintf (buf, buf_len, " %s = '%s'", parameter, value); \
if (0 < s) { \
buf += s; \
buf_len -= s; \
} \
}
/* Returns the tuple (major, minor, patchlevel)
* for the given version number. */
#define C_PSQL_SERVER_VERSION3(server_version) \
(server_version) / 10000, \
(server_version) / 100 - (int)((server_version) / 10000) * 100, \
(server_version) - (int)((server_version) / 100) * 100
/* Returns true if the given host specifies a
* UNIX domain socket. */
#define C_PSQL_IS_UNIX_DOMAIN_SOCKET(host) \
((NULL == (host)) || ('\0' == *(host)) || ('/' == *(host)))
/* Returns the tuple (host, delimiter, port) for a
* given (host, port) pair. Depending on the value of
* 'host' a UNIX domain socket or a TCP socket is
* assumed. */
#define C_PSQL_SOCKET3(host, port) \
((NULL == (host)) || ('\0' == *(host))) ? DEFAULT_PGSOCKET_DIR : host, \
C_PSQL_IS_UNIX_DOMAIN_SOCKET (host) ? "/.s.PGSQL." : ":", \
port
typedef enum {
C_PSQL_PARAM_HOST = 1,
C_PSQL_PARAM_DB,
C_PSQL_PARAM_USER,
C_PSQL_PARAM_INTERVAL,
C_PSQL_PARAM_INSTANCE,
} c_psql_param_t;
/* Parameter configuration. Stored as `user data' in the query objects. */
typedef struct {
c_psql_param_t *params;
int params_num;
} c_psql_user_data_t;
typedef struct {
char *name;
char *statement;
_Bool store_rates;
} c_psql_writer_t;
typedef struct {
PGconn *conn;
c_complain_t conn_complaint;
int proto_version;
int server_version;
int max_params_num;
/* user configuration */
udb_query_preparation_area_t **q_prep_areas;
udb_query_t **queries;
size_t queries_num;
c_psql_writer_t **writers;
size_t writers_num;
/* make sure we don't access the database object in parallel */
pthread_mutex_t db_lock;
cdtime_t interval;
/* writer "caching" settings */
cdtime_t commit_interval;
cdtime_t next_commit;
char *host;
char *port;
char *database;
char *user;
char *password;
char *instance;
char *sslmode;
char *krbsrvname;
char *service;
int ref_cnt;
} c_psql_database_t;
static char *def_queries[] = {
"backends",
"transactions",
"queries",
"query_plans",
"table_states",
"disk_io",
"disk_usage"
};
static int def_queries_num = STATIC_ARRAY_SIZE (def_queries);
static c_psql_database_t **databases = NULL;
static size_t databases_num = 0;
static udb_query_t **queries = NULL;
static size_t queries_num = 0;
static c_psql_writer_t *writers = NULL;
static size_t writers_num = 0;
static int c_psql_begin (c_psql_database_t *db)
{
PGresult *r = PQexec (db->conn, "BEGIN");
int status = 1;
if (r != NULL) {
if (PGRES_COMMAND_OK == PQresultStatus (r)) {
db->next_commit = cdtime() + db->commit_interval;
status = 0;
}
else
log_warn ("Failed to initiate ('BEGIN') transaction: %s",
PQerrorMessage (db->conn));
PQclear (r);
}
return status;
} /* c_psql_begin */
static int c_psql_commit (c_psql_database_t *db)
{
PGresult *r = PQexec (db->conn, "COMMIT");
int status = 1;
if (r != NULL) {
if (PGRES_COMMAND_OK == PQresultStatus (r)) {
db->next_commit = 0;
log_debug ("Successfully committed transaction.");
status = 0;
}
else
log_warn ("Failed to commit transaction: %s",
PQerrorMessage (db->conn));
PQclear (r);
}
return status;
} /* c_psql_commit */
static c_psql_database_t *c_psql_database_new (const char *name)
{
c_psql_database_t **tmp;
c_psql_database_t *db;
db = (c_psql_database_t *)malloc (sizeof(*db));
if (NULL == db) {
log_err ("Out of memory.");
return NULL;
}
tmp = (c_psql_database_t **)realloc (databases,
(databases_num + 1) * sizeof (*databases));
if (NULL == tmp) {
log_err ("Out of memory.");
sfree (db);
return NULL;
}
databases = tmp;
databases[databases_num] = db;
++databases_num;
db->conn = NULL;
C_COMPLAIN_INIT (&db->conn_complaint);
db->proto_version = 0;
db->server_version = 0;
db->max_params_num = 0;
db->q_prep_areas = NULL;
db->queries = NULL;
db->queries_num = 0;
db->writers = NULL;
db->writers_num = 0;
pthread_mutex_init (&db->db_lock, /* attrs = */ NULL);
db->interval = 0;
db->commit_interval = 0;
db->next_commit = 0;
db->database = sstrdup (name);
db->host = NULL;
db->port = NULL;
db->user = NULL;
db->password = NULL;
db->instance = sstrdup (name);
db->sslmode = NULL;
db->krbsrvname = NULL;
db->service = NULL;
db->ref_cnt = 0;
return db;
} /* c_psql_database_new */
static void c_psql_database_delete (void *data)
{
size_t i;
c_psql_database_t *db = data;
--db->ref_cnt;
/* readers and writers may access this database */
if (db->ref_cnt > 0)
return;
/* wait for the lock to be released by the last writer */
pthread_mutex_lock (&db->db_lock);
if (db->next_commit > 0)
c_psql_commit (db);
PQfinish (db->conn);
db->conn = NULL;
if (db->q_prep_areas)
for (i = 0; i < db->queries_num; ++i)
udb_query_delete_preparation_area (db->q_prep_areas[i]);
free (db->q_prep_areas);
sfree (db->queries);
db->queries_num = 0;
sfree (db->writers);
db->writers_num = 0;
pthread_mutex_unlock (&db->db_lock);
pthread_mutex_destroy (&db->db_lock);
sfree (db->database);
sfree (db->host);
sfree (db->port);
sfree (db->user);
sfree (db->password);
sfree (db->instance);
sfree (db->sslmode);
sfree (db->krbsrvname);
sfree (db->service);
/* don't care about freeing or reordering the 'databases' array
* this is done in 'shutdown'; also, don't free the database instance
* object just to make sure that in case anybody accesses it before
* shutdown won't segfault */
return;
} /* c_psql_database_delete */
static int c_psql_connect (c_psql_database_t *db)
{
char conninfo[4096];
char *buf = conninfo;
int buf_len = sizeof (conninfo);
int status;
if ((! db) || (! db->database))
return -1;
status = ssnprintf (buf, buf_len, "dbname = '%s'", db->database);
if (0 < status) {
buf += status;
buf_len -= status;
}
C_PSQL_PAR_APPEND (buf, buf_len, "host", db->host);
C_PSQL_PAR_APPEND (buf, buf_len, "port", db->port);
C_PSQL_PAR_APPEND (buf, buf_len, "user", db->user);
C_PSQL_PAR_APPEND (buf, buf_len, "password", db->password);
C_PSQL_PAR_APPEND (buf, buf_len, "sslmode", db->sslmode);
C_PSQL_PAR_APPEND (buf, buf_len, "krbsrvname", db->krbsrvname);
C_PSQL_PAR_APPEND (buf, buf_len, "service", db->service);
db->conn = PQconnectdb (conninfo);
db->proto_version = PQprotocolVersion (db->conn);
return 0;
} /* c_psql_connect */
static int c_psql_check_connection (c_psql_database_t *db)
{
_Bool init = 0;
if (! db->conn) {
init = 1;
/* trigger c_release() */
if (0 == db->conn_complaint.interval)
db->conn_complaint.interval = 1;
c_psql_connect (db);
}
/* "ping" */
PQclear (PQexec (db->conn, "SELECT 42;"));
if (CONNECTION_OK != PQstatus (db->conn)) {
PQreset (db->conn);
/* trigger c_release() */
if (0 == db->conn_complaint.interval)
db->conn_complaint.interval = 1;
if (CONNECTION_OK != PQstatus (db->conn)) {
c_complain (LOG_ERR, &db->conn_complaint,
"Failed to connect to database %s (%s): %s",
db->database, db->instance,
PQerrorMessage (db->conn));
return -1;
}
db->proto_version = PQprotocolVersion (db->conn);
}
db->server_version = PQserverVersion (db->conn);
if (c_would_release (&db->conn_complaint)) {
char *server_host;
int server_version;
server_host = PQhost (db->conn);
server_version = PQserverVersion (db->conn);
c_do_release (LOG_INFO, &db->conn_complaint,
"Successfully %sconnected to database %s (user %s) "
"at server %s%s%s (server version: %d.%d.%d, "
"protocol version: %d, pid: %d)", init ? "" : "re",
PQdb (db->conn), PQuser (db->conn),
C_PSQL_SOCKET3 (server_host, PQport (db->conn)),
C_PSQL_SERVER_VERSION3 (server_version),
db->proto_version, PQbackendPID (db->conn));
if (3 > db->proto_version)
log_warn ("Protocol version %d does not support parameters.",
db->proto_version);
}
return 0;
} /* c_psql_check_connection */
static PGresult *c_psql_exec_query_noparams (c_psql_database_t *db,
udb_query_t *q)
{
return PQexec (db->conn, udb_query_get_statement (q));
} /* c_psql_exec_query_noparams */
static PGresult *c_psql_exec_query_params (c_psql_database_t *db,
udb_query_t *q, c_psql_user_data_t *data)
{
char *params[db->max_params_num];
char interval[64];
int i;
if ((data == NULL) || (data->params_num == 0))
return (c_psql_exec_query_noparams (db, q));
assert (db->max_params_num >= data->params_num);
for (i = 0; i < data->params_num; ++i) {
switch (data->params[i]) {
case C_PSQL_PARAM_HOST:
params[i] = C_PSQL_IS_UNIX_DOMAIN_SOCKET (db->host)
? "localhost" : db->host;
break;
case C_PSQL_PARAM_DB:
params[i] = db->database;
break;
case C_PSQL_PARAM_USER:
params[i] = db->user;
break;
case C_PSQL_PARAM_INTERVAL:
ssnprintf (interval, sizeof (interval), "%.3f",
(db->interval > 0)
? CDTIME_T_TO_DOUBLE (db->interval)
: plugin_get_interval ());
params[i] = interval;
break;
case C_PSQL_PARAM_INSTANCE:
params[i] = db->instance;
break;
default:
assert (0);
}
}
return PQexecParams (db->conn, udb_query_get_statement (q),
data->params_num, NULL,
(const char *const *) params,
NULL, NULL, /* return text data */ 0);
} /* c_psql_exec_query_params */
/* db->db_lock must be locked when calling this function */
static int c_psql_exec_query (c_psql_database_t *db, udb_query_t *q,
udb_query_preparation_area_t *prep_area)
{
PGresult *res;
c_psql_user_data_t *data;
const char *host;
char **column_names;
char **column_values;
int column_num;
int rows_num;
int status;
int row, col;
/* The user data may hold parameter information, but may be NULL. */
data = udb_query_get_user_data (q);
/* Versions up to `3' don't know how to handle parameters. */
if (3 <= db->proto_version)
res = c_psql_exec_query_params (db, q, data);
else if ((NULL == data) || (0 == data->params_num))
res = c_psql_exec_query_noparams (db, q);
else {
log_err ("Connection to database \"%s\" (%s) does not support "
"parameters (protocol version %d) - "
"cannot execute query \"%s\".",
db->database, db->instance, db->proto_version,
udb_query_get_name (q));
return -1;
}
/* give c_psql_write() a chance to acquire the lock if called recursively
* through dispatch_values(); this will happen if, both, queries and
* writers are configured for a single connection */
pthread_mutex_unlock (&db->db_lock);
column_names = NULL;
column_values = NULL;
if (PGRES_TUPLES_OK != PQresultStatus (res)) {
pthread_mutex_lock (&db->db_lock);
log_err ("Failed to execute SQL query: %s",
PQerrorMessage (db->conn));
log_info ("SQL query was: %s",
udb_query_get_statement (q));
PQclear (res);
return -1;
}
#define BAIL_OUT(status) \
sfree (column_names); \
sfree (column_values); \
PQclear (res); \
pthread_mutex_lock (&db->db_lock); \
return status
rows_num = PQntuples (res);
if (1 > rows_num) {
BAIL_OUT (0);
}
column_num = PQnfields (res);
column_names = (char **) calloc (column_num, sizeof (char *));
if (NULL == column_names) {
log_err ("calloc failed.");
BAIL_OUT (-1);
}
column_values = (char **) calloc (column_num, sizeof (char *));
if (NULL == column_values) {
log_err ("calloc failed.");
BAIL_OUT (-1);
}
for (col = 0; col < column_num; ++col) {
/* Pointers returned by `PQfname' are freed by `PQclear' via
* `BAIL_OUT'. */
column_names[col] = PQfname (res, col);
if (NULL == column_names[col]) {
log_err ("Failed to resolve name of column %i.", col);
BAIL_OUT (-1);
}
}
if (C_PSQL_IS_UNIX_DOMAIN_SOCKET (db->host)
|| (0 == strcmp (db->host, "localhost")))
host = hostname_g;
else
host = db->host;
status = udb_query_prepare_result (q, prep_area, host, "postgresql",
db->instance, column_names, (size_t) column_num, db->interval);
if (0 != status) {
log_err ("udb_query_prepare_result failed with status %i.",
status);
BAIL_OUT (-1);
}
for (row = 0; row < rows_num; ++row) {
for (col = 0; col < column_num; ++col) {
/* Pointers returned by `PQgetvalue' are freed by `PQclear' via
* `BAIL_OUT'. */
column_values[col] = PQgetvalue (res, row, col);
if (NULL == column_values[col]) {
log_err ("Failed to get value at (row = %i, col = %i).",
row, col);
break;
}
}
/* check for an error */
if (col < column_num)
continue;
status = udb_query_handle_result (q, prep_area, column_values);
if (status != 0) {
log_err ("udb_query_handle_result failed with status %i.",
status);
}
} /* for (row = 0; row < rows_num; ++row) */
udb_query_finish_result (q, prep_area);
BAIL_OUT (0);
#undef BAIL_OUT
} /* c_psql_exec_query */
static int c_psql_read (user_data_t *ud)
{
c_psql_database_t *db;
int success = 0;
int i;
if ((ud == NULL) || (ud->data == NULL)) {
log_err ("c_psql_read: Invalid user data.");
return -1;
}
db = ud->data;
assert (NULL != db->database);
assert (NULL != db->instance);
assert (NULL != db->queries);
pthread_mutex_lock (&db->db_lock);
if (0 != c_psql_check_connection (db)) {
pthread_mutex_unlock (&db->db_lock);
return -1;
}
for (i = 0; i < db->queries_num; ++i)
{
udb_query_preparation_area_t *prep_area;
udb_query_t *q;
prep_area = db->q_prep_areas[i];
q = db->queries[i];
if ((0 != db->server_version)
&& (udb_query_check_version (q, db->server_version) <= 0))
continue;
if (0 == c_psql_exec_query (db, q, prep_area))
success = 1;
}
pthread_mutex_unlock (&db->db_lock);
if (! success)
return -1;
return 0;
} /* c_psql_read */
static char *values_name_to_sqlarray (const data_set_t *ds,
char *string, size_t string_len)
{
char *str_ptr;
size_t str_len;
int i;
str_ptr = string;
str_len = string_len;
for (i = 0; i < ds->ds_num; ++i) {
int status = ssnprintf (str_ptr, str_len, ",'%s'", ds->ds[i].name);
if (status < 1)
return NULL;
else if ((size_t)status >= str_len) {
str_len = 0;
break;
}
else {
str_ptr += status;
str_len -= (size_t)status;
}
}
if (str_len <= 2) {
log_err ("c_psql_write: Failed to stringify value names");
return NULL;
}
/* overwrite the first comma */
string[0] = '{';
str_ptr[0] = '}';
str_ptr[1] = '\0';
return string;
} /* values_name_to_sqlarray */
static char *values_type_to_sqlarray (const data_set_t *ds,
char *string, size_t string_len, _Bool store_rates)
{
char *str_ptr;
size_t str_len;
int i;
str_ptr = string;
str_len = string_len;
for (i = 0; i < ds->ds_num; ++i) {
int status;
if (store_rates)
status = ssnprintf(str_ptr, str_len, ",'gauge'");
else
status = ssnprintf(str_ptr, str_len, ",'%s'",
DS_TYPE_TO_STRING (ds->ds[i].type));
if (status < 1) {
str_len = 0;
break;
}
else if ((size_t)status >= str_len) {
str_len = 0;
break;
}
else {
str_ptr += status;
str_len -= (size_t)status;
}
}
if (str_len <= 2) {
log_err ("c_psql_write: Failed to stringify value types");
return NULL;
}
/* overwrite the first comma */
string[0] = '{';
str_ptr[0] = '}';
str_ptr[1] = '\0';
return string;
} /* values_type_to_sqlarray */
static char *values_to_sqlarray (const data_set_t *ds, const value_list_t *vl,
char *string, size_t string_len, _Bool store_rates)
{
char *str_ptr;
size_t str_len;
gauge_t *rates = NULL;
int i;
str_ptr = string;
str_len = string_len;
for (i = 0; i < vl->values_len; ++i) {
int status = 0;
if ((ds->ds[i].type != DS_TYPE_GAUGE)
&& (ds->ds[i].type != DS_TYPE_COUNTER)
&& (ds->ds[i].type != DS_TYPE_DERIVE)
&& (ds->ds[i].type != DS_TYPE_ABSOLUTE)) {
log_err ("c_psql_write: Unknown data source type: %i",
ds->ds[i].type);
sfree (rates);
return NULL;
}
if (ds->ds[i].type == DS_TYPE_GAUGE)
status = ssnprintf (str_ptr, str_len,
",%f", vl->values[i].gauge);
else if (store_rates) {
if (rates == NULL)
rates = uc_get_rate (ds, vl);
if (rates == NULL) {
log_err ("c_psql_write: Failed to determine rate");
return NULL;
}
status = ssnprintf (str_ptr, str_len,
",%lf", rates[i]);
}
else if (ds->ds[i].type == DS_TYPE_COUNTER)
status = ssnprintf (str_ptr, str_len,
",%llu", vl->values[i].counter);
else if (ds->ds[i].type == DS_TYPE_DERIVE)
status = ssnprintf (str_ptr, str_len,
",%"PRIi64, vl->values[i].derive);
else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
status = ssnprintf (str_ptr, str_len,
",%"PRIu64, vl->values[i].absolute);
if (status < 1) {
str_len = 0;
break;
}
else if ((size_t)status >= str_len) {
str_len = 0;
break;
}
else {
str_ptr += status;
str_len -= (size_t)status;
}
}
sfree (rates);
if (str_len <= 2) {
log_err ("c_psql_write: Failed to stringify value list");
return NULL;
}
/* overwrite the first comma */
string[0] = '{';
str_ptr[0] = '}';
str_ptr[1] = '\0';
return string;
} /* values_to_sqlarray */
static int c_psql_write (const data_set_t *ds, const value_list_t *vl,
user_data_t *ud)
{
c_psql_database_t *db;
char time_str[32];
char values_name_str[1024];
char values_type_str[1024];
char values_str[1024];
const char *params[9];
int success = 0;
int i;
if ((ud == NULL) || (ud->data == NULL)) {
log_err ("c_psql_write: Invalid user data.");
return -1;
}
db = ud->data;
assert (db->database != NULL);
assert (db->writers != NULL);
if (cdtime_to_iso8601 (time_str, sizeof (time_str), vl->time) == 0) {
log_err ("c_psql_write: Failed to convert time to ISO 8601 format");
return -1;
}
if (values_name_to_sqlarray (ds,
values_name_str, sizeof (values_name_str)) == NULL)
return -1;
#define VALUE_OR_NULL(v) ((((v) == NULL) || (*(v) == '\0')) ? NULL : (v))
params[0] = time_str;
params[1] = vl->host;
params[2] = vl->plugin;
params[3] = VALUE_OR_NULL(vl->plugin_instance);
params[4] = vl->type;
params[5] = VALUE_OR_NULL(vl->type_instance);
params[6] = values_name_str;
#undef VALUE_OR_NULL
pthread_mutex_lock (&db->db_lock);
if (0 != c_psql_check_connection (db)) {
pthread_mutex_unlock (&db->db_lock);
return -1;
}
if ((db->commit_interval > 0)
&& (db->next_commit == 0))
c_psql_begin (db);
for (i = 0; i < db->writers_num; ++i) {
c_psql_writer_t *writer;
PGresult *res;
writer = db->writers[i];
if (values_type_to_sqlarray (ds,
values_type_str, sizeof (values_type_str),
writer->store_rates) == NULL) {
pthread_mutex_unlock (&db->db_lock);
return -1;
}
if (values_to_sqlarray (ds, vl,
values_str, sizeof (values_str),
writer->store_rates) == NULL) {
pthread_mutex_unlock (&db->db_lock);
return -1;
}
params[7] = values_type_str;
params[8] = values_str;
res = PQexecParams (db->conn, writer->statement,
STATIC_ARRAY_SIZE (params), NULL,
(const char *const *)params,
NULL, NULL, /* return text data */ 0);
if ((PGRES_COMMAND_OK != PQresultStatus (res))
&& (PGRES_TUPLES_OK != PQresultStatus (res))) {
PQclear (res);
if ((CONNECTION_OK != PQstatus (db->conn))
&& (0 == c_psql_check_connection (db))) {
/* try again */
res = PQexecParams (db->conn, writer->statement,
STATIC_ARRAY_SIZE (params), NULL,
(const char *const *)params,
NULL, NULL, /* return text data */ 0);
if ((PGRES_COMMAND_OK == PQresultStatus (res))
|| (PGRES_TUPLES_OK == PQresultStatus (res))) {
PQclear (res);
success = 1;
continue;
}
}
log_err ("Failed to execute SQL query: %s",
PQerrorMessage (db->conn));
log_info ("SQL query was: '%s', "
"params: %s, %s, %s, %s, %s, %s, %s, %s",
writer->statement,
params[0], params[1], params[2], params[3],
params[4], params[5], params[6], params[7]);
/* this will abort any current transaction -> restart */
if (db->next_commit > 0)
c_psql_commit (db);
pthread_mutex_unlock (&db->db_lock);
return -1;
}
PQclear (res);
success = 1;
}
if ((db->next_commit > 0)
&& (cdtime () > db->next_commit))
c_psql_commit (db);
pthread_mutex_unlock (&db->db_lock);
if (! success)
return -1;
return 0;
} /* c_psql_write */
/* We cannot flush single identifiers as all we do is to commit the currently
* running transaction, thus making sure that all written data is actually
* visible to everybody. */
static int c_psql_flush (cdtime_t timeout,
__attribute__((unused)) const char *ident,
user_data_t *ud)
{
c_psql_database_t **dbs = databases;
size_t dbs_num = databases_num;
size_t i;
if ((ud != NULL) && (ud->data != NULL)) {
dbs = (void *)&ud->data;
dbs_num = 1;
}
for (i = 0; i < dbs_num; ++i) {
c_psql_database_t *db = dbs[i];
/* don't commit if the timeout is larger than the regular commit
* interval as in that case all requested data has already been
* committed */
if ((db->next_commit > 0) && (db->commit_interval > timeout))
c_psql_commit (db);
}
return 0;
} /* c_psql_flush */
static int c_psql_shutdown (void)
{
size_t i = 0;
_Bool had_flush = 0;
plugin_unregister_read_group ("postgresql");
for (i = 0; i < databases_num; ++i) {
c_psql_database_t *db = databases[i];