/**
* collectd - src/postgresql.c
- * Copyright (C) 2008, 2009 Sebastian Harl
- * Copyright (C) 2009 Florian Forster
- * All rights reserved.
+ * Copyright (C) 2008-2012 Sebastian Harl
+ * Copyright (C) 2009 Florian Forster
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
*
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * - 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.
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
*
* Authors:
* Sebastian Harl <sh at tokkee.org>
- * Florian Forster <octo at verplant.org>
+ * Florian Forster <octo at collectd.org>
**/
/*
#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"
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. */
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[] = {
};
static int def_queries_num = STATIC_ARRAY_SIZE (def_queries);
-static udb_query_t **queries = NULL;
-static size_t queries_num = 0;
+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 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 *db;
+ c_psql_database_t **tmp;
+ c_psql_database_t *db;
- db = (c_psql_database_t *)malloc (sizeof (*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->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 */
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;
sfree (db->writers);
db->writers_num = 0;
+ pthread_mutex_unlock (&db->db_lock);
+
pthread_mutex_destroy (&db->db_lock);
sfree (db->database);
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 */
int buf_len = sizeof (conninfo);
int status;
- if (! db)
+ if ((! db) || (! db->database))
return -1;
status = ssnprintf (buf, buf_len, "dbname = '%s'", db->database);
c_psql_connect (db);
}
- /* "ping" */
- PQclear (PQexec (db->conn, "SELECT 42;"));
-
if (CONNECTION_OK != PQstatus (db->conn)) {
PQreset (db->conn);
if (CONNECTION_OK != PQstatus (db->conn)) {
c_complain (LOG_ERR, &db->conn_complaint,
- "Failed to connect to database %s: %s",
- db->database, PQerrorMessage (db->conn));
+ "Failed to connect to database %s (%s): %s",
+ db->database, db->instance,
+ PQerrorMessage (db->conn));
return -1;
}
case C_PSQL_PARAM_INTERVAL:
ssnprintf (interval, sizeof (interval), "%.3f",
(db->interval > 0)
- ? CDTIME_T_TO_DOUBLE (db->interval) : interval_g);
+ ? 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);
}
else if ((NULL == data) || (0 == data->params_num))
res = c_psql_exec_query_noparams (db, q);
else {
- log_err ("Connection to database \"%s\" does not support parameters "
- "(protocol version %d) - cannot execute query \"%s\".",
- db->database, db->proto_version,
+ 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;
}
if (PGRES_TUPLES_OK != PQresultStatus (res)) {
pthread_mutex_lock (&db->db_lock);
+ if ((CONNECTION_OK != PQstatus (db->conn))
+ && (0 == c_psql_check_connection (db))) {
+ PQclear (res);
+ return c_psql_exec_query (db, q, prep_area);
+ }
+
log_err ("Failed to execute SQL query: %s",
PQerrorMessage (db->conn));
log_info ("SQL query was: %s",
}
if (C_PSQL_IS_UNIX_DOMAIN_SOCKET (db->host)
+ || (0 == strcmp (db->host, "127.0.0.1"))
|| (0 == strcmp (db->host, "localhost")))
host = hostname_g;
else
host = db->host;
status = udb_query_prepare_result (q, prep_area, host, "postgresql",
- db->database, column_names, (size_t) column_num, db->interval);
+ db->instance, column_names, (size_t) column_num, db->interval);
if (0 != status) {
log_err ("udb_query_prepare_result failed with status %i.",
status);
db = ud->data;
assert (NULL != db->database);
+ assert (NULL != db->instance);
assert (NULL != db->queries);
pthread_mutex_lock (&db->db_lock);
str_len = string_len;
for (i = 0; i < vl->values_len; ++i) {
- int status;
+ int status = 0;
if ((ds->ds[i].type != DS_TYPE_GAUGE)
&& (ds->ds[i].type != DS_TYPE_COUNTER)
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;
if (values_type_to_sqlarray (ds,
values_type_str, sizeof (values_type_str),
- writer->store_rates) == NULL)
+ 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)
+ writer->store_rates) == NULL) {
+ pthread_mutex_unlock (&db->db_lock);
return -1;
+ }
params[7] = values_type_str;
params[8] = values_str;
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))) {
- PQclear (res);
-
/* try again */
res = PQexecParams (db->conn, writer->statement,
STATIC_ARRAY_SIZE (params), NULL,
if ((PGRES_COMMAND_OK == PQresultStatus (res))
|| (PGRES_TUPLES_OK == PQresultStatus (res))) {
+ PQclear (res);
success = 1;
continue;
}
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 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];
+
+ if (db->writers_num > 0) {
+ char cb_name[DATA_MAX_NAME_LEN];
+ ssnprintf (cb_name, sizeof (cb_name), "postgresql-%s",
+ db->database);
+
+ if (! had_flush) {
+ plugin_unregister_flush ("postgresql");
+ had_flush = 1;
+ }
+
+ plugin_unregister_flush (cb_name);
+ plugin_unregister_write (cb_name);
+ }
+
+ sfree (db);
+ }
+
udb_query_free (queries, queries_num);
queries = NULL;
queries_num = 0;
writers = NULL;
writers_num = 0;
+ sfree (databases);
+ databases = NULL;
+ databases_num = 0;
+
return 0;
} /* c_psql_shutdown */
data->params[data->params_num] = C_PSQL_PARAM_USER;
else if (0 == strcasecmp (param_str, "interval"))
data->params[data->params_num] = C_PSQL_PARAM_INTERVAL;
+ else if (0 == strcasecmp (param_str, "instance"))
+ data->params[data->params_num] = C_PSQL_PARAM_INSTANCE;
else {
log_err ("Invalid parameter \"%s\".", param_str);
return 1;
if (strcasecmp ("Statement", c->key) == 0)
status = cf_util_get_string (c, &writer->statement);
- if (strcasecmp ("StoreRates", c->key) == 0)
+ else if (strcasecmp ("StoreRates", c->key) == 0)
status = cf_util_get_boolean (c, &writer->store_rates);
else
log_warn ("Ignoring unknown config key \"%s\".", c->key);
struct timespec cb_interval = { 0, 0 };
user_data_t ud;
+ static _Bool have_flush = 0;
+
int i;
if ((1 != ci->values_num)
cf_util_get_string (c, &db->user);
else if (0 == strcasecmp (c->key, "Password"))
cf_util_get_string (c, &db->password);
+ else if (0 == strcasecmp (c->key, "Instance"))
+ cf_util_get_string (c, &db->instance);
else if (0 == strcasecmp (c->key, "SSLMode"))
cf_util_get_string (c, &db->sslmode);
else if (0 == strcasecmp (c->key, "KRBSrvName"))
&db->writers, &db->writers_num);
else if (0 == strcasecmp (c->key, "Interval"))
cf_util_get_cdtime (c, &db->interval);
+ else if (strcasecmp ("CommitInterval", c->key) == 0)
+ cf_util_get_cdtime (c, &db->commit_interval);
else
log_warn ("Ignoring unknown config key \"%s\".", c->key);
}
ud.data = db;
ud.free_func = c_psql_database_delete;
- ssnprintf (cb_name, sizeof (cb_name), "postgresql-%s", db->database);
+ ssnprintf (cb_name, sizeof (cb_name), "postgresql-%s", db->instance);
if (db->queries_num > 0) {
CDTIME_T_TO_TIMESPEC (db->interval, &cb_interval);
+ ++db->ref_cnt;
plugin_register_complex_read ("postgresql", cb_name, c_psql_read,
/* interval = */ (db->interval > 0) ? &cb_interval : NULL,
&ud);
}
if (db->writers_num > 0) {
+ ++db->ref_cnt;
plugin_register_write (cb_name, c_psql_write, &ud);
+
+ if (! have_flush) {
+ /* flush all */
+ plugin_register_flush ("postgresql",
+ c_psql_flush, /* user data = */ NULL);
+ have_flush = 1;
+ }
+
+ /* flush this connection only */
+ ++db->ref_cnt;
+ plugin_register_flush (cb_name, c_psql_flush, &ud);
+ }
+ else if (db->commit_interval > 0) {
+ log_warn ("Database '%s': You do not have any writers assigned to "
+ "this database connection. Setting 'CommitInterval' does "
+ "not have any effect.", db->database);
}
return 0;
} /* c_psql_config_database */
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