MDL-58651 logstore_database: Add ability to not send database options

In the core dml:
PostgreSQL connections now use advanced options to reduce connection overhead.
These options are not compatible with some connection poolers. The
dbhandlesoptions parameter has been added to allow the database to configure
the required defaults.

This item adds a setting to the logstore_database plugin to let you set the
same flag for your destination database - without it you won't be able to ship
logs to a postgresql database with a pgbouncer frontend.

admin/tool/log/store/database/classes/log/store.php

@@ -88,6 +88,7 @@ protected function init() {
         $dboptions['dbport'] = $this->get_config('dbport', '');
         $dboptions['dbschema'] = $this->get_config('dbschema', '');
         $dboptions['dbcollation'] = $this->get_config('dbcollation', '');
+        $dboptions['dbhandlesoptions'] = $this->get_config('dbhandlesoptions', false);
         try {
             $db->connect($this->get_config('dbhost'), $this->get_config('dbuser'), $this->get_config('dbpass'),
                 $this->get_config('dbname'), false, $dboptions);

admin/tool/log/store/database/lang/en/logstore_database.php

@@ -31,6 +31,8 @@
 $string['databasepersist'] = 'Persistent database connections';
 $string['databaseschema'] = 'Database schema';
 $string['databasecollation'] = 'Database collation';
+$string['databasehandlesoptions'] = 'Database handles options';
+$string['databasehandlesoptions_help'] = 'Does the remote database handle its own options.';
 $string['databasetable'] = 'Database table';
 $string['databasetable_help'] = 'Name of the table where logs will be stored. This table should have a structure identical to the one used by logstore_standard (mdl_logstore_standard_log).';
 $string['includeactions'] = 'Include actions of these types';

admin/tool/log/store/database/settings.php

@@ -54,6 +54,8 @@
         'logstore_database'), '', ''));
     $settings->add(new admin_setting_configtext('logstore_database/dbcollation', get_string('databasecollation',
         'logstore_database'), '', ''));
+    $settings->add(new admin_setting_configcheckbox('logstore_database/dbhandlesoptions', get_string('databasehandlesoptions',
+        'logstore_database'), get_string('databasehandlesoptions_help', 'logstore_database'), '0'));
     $settings->add(new admin_setting_configtext('logstore_database/buffersize', get_string('buffersize',
         'logstore_database'), get_string('buffersize_help', 'logstore_database'), 50));
 

admin/tool/log/store/database/tests/store_test.php

@@ -83,6 +83,11 @@ public function test_log_writing() {
         } else {
             set_config('dbcollation', '', 'logstore_database');
         }
+        if (!empty($CFG->dboptions['dbhandlesoptions'])) {
+            set_config('dbhandlesoptions', $CFG->dboptions['dbhandlesoptions'], 'logstore_database');
+        } else {
+            set_config('dbhandlesoptions', false, 'logstore_database');
+        }
 
         // Enable logging plugin.
         set_config('enabled_stores', 'logstore_database', 'tool_log');

admin/tool/log/store/database/upgrade.txt

@@ -0,0 +1,11 @@
+This files describes API changes in the logstore_database code.
+
+=== 3.4 ===
+* PostgreSQL connections now use advanced options to reduce connection overhead.  These options are not compatible
+  with some connection poolers.  The dbhandlesoptions parameter has been added to allow the database to configure the
+  required defaults. The parameters that are required in the database are;
+    ALTER DATABASE moodle SET client_encoding = UTF8;
+    ALTER DATABASE moodle SET standard_conforming_strings = on;
+    ALTER DATABASE moodle SET search_path = 'moodle,public';  -- Optional, if you wish to use a custom schema.
+  You can set these options against the database or the moodle user who connects.
+

admin/tool/log/store/database/version.php

@@ -24,6 +24,6 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2017051500; // The current plugin version (Date: YYYYMMDDXX).
+$plugin->version = 2017062600; // The current plugin version (Date: YYYYMMDDXX).
 $plugin->requires = 2017050500; // Requires this Moodle version.
 $plugin->component = 'logstore_database'; // Full name of the plugin (used for diagnostics).