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7b262a6851
* feature: Improve yaml state discovery Handle state values that are returned as strings instead of int Synchronize state values for existing state translations so we can change them without creating a new translation and losing historical data More extensive/verbose yaml discovery phpunit tests dbBulkInsert, use the first entry instead of requiring the first entry to be at index 0 * Update sensor state documentation re-order values for better readability remove os check Use snmpwalk_group since it is more flexible * Add some more debug output in dynamic discovery
142 lines
5.2 KiB
Markdown
142 lines
5.2 KiB
Markdown
source: Developing/Sensor-State-Support.md
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# Sensor State Support
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### Introduction
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In this section we are briefly going to walk through, what it takes to write sensor state support.
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We will also briefly get around the concepts of the current sensor state monitoring.
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### Logic
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For sensor state monitoring, we have 4 DB tables we need to concentrate about.
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- sensors
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- state_indexes
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- state_translations
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- sensors_to_state_indexes
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We will just briefly tie a comment to each one of them.
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#### sensors
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*Each time a sensor needs to be polled, the system needs to know which sensor is it that it need to poll, at what oid is this sensor located and what class the sensor is etc.
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This information is fetched from the sensors table.*
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#### state_indexes
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*Is where we keep track of which state sensors we monitor.*
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#### state_translations
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*Is where we map the possible returned state sensor values to a generic LibreNMS value, in order to make displaying and alerting more generic.
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We also map these values to the actual state sensor(state_index) where these values are actually returned from.*
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*The LibreNMS generic states is derived from Nagios:*
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```
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0 = OK
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1 = Warning
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2 = Critical
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3 = Unknown
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```
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#### sensors_to_state_indexes
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*Is as you might have guessed, where the sensor_id is mapped to a state_index_id.*
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### Example
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For YAML based state discovery:
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```yaml
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mib: NETBOTZV2-MIB
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modules:
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sensors:
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state:
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-
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oid: dryContactSensorTable
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value: dryContactSensorValue
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num_oid: .1.3.6.1.4.1.5528.100.4.2.1.1.2.
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descr: dryContactSensorLabel
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index: 'dryContactSensor.{{ $index }}'
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state_name: dryContactSensor
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states:
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- { descr: 'null', graph: 0, value: -1, generic: 3 }
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- { descr: open, graph: 0, value: 0, generic: 0 }
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- { descr: closed, graph: 0, value: 1, generic: 2 }
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-
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oid: doorSwitchSensorTable
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value: doorSwitchSensorValue
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num_oid: .1.3.6.1.4.1.5528.100.4.2.2.1.2.
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descr: doorSwitchSensorLabel
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index: 'doorSwitchSensor.{{ $index }}'
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state_name: doorSwitchSensor
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states:
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- { descr: 'null', graph: 0, value: -1, generic: 3 }
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- { descr: open, graph: 0, value: 0, generic: 0 }
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- { descr: closed, graph: 0, value: 1, generic: 2 }
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-
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oid: cameraMotionSensorTable
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value: cameraMotionSensorValue
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num_oid: .1.3.6.1.4.1.5528.100.4.2.3.1.2.
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descr: cameraMotionSensorLabel
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index: 'cameraMotionSensor.{{ $index }}'
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state_name: cameraMotionSensor
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states:
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- { descr: 'null', graph: 0, value: -1, generic: 3 }
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- { descr: noMotion, graph: 0, value: 0, generic: 0 }
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- { descr: motionDetected, graph: 0, value: 1, generic: 2 }
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-
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oid: otherStateSensorTable
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value: otherStateSensorErrorStatus
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num_oid: .1.3.6.1.4.1.5528.100.4.2.10.1.3.
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descr: otherStateSensorLabel
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index: '{{ $index }}'
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state_name: otherStateSensorErrorStatus
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states:
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- { value: 0, generic: 0, graph: 0, descr: normal }
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- { value: 1, generic: 1, graph: 0, descr: info }
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- { value: 2, generic: 1, graph: 0, descr: warning }
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- { value: 3, generic: 2, graph: 0, descr: error }
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- { value: 4, generic: 2, graph: 0, descr: critical }
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- { value: 5, generic: 2, graph: 0, descr: failure }
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```
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For advanced state discovery:
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This example will be based on a Cisco power supply sensor and is all it takes to have sensor state support for Cisco power supplys in Cisco switches.
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The file should be located in /includes/discovery/sensors/state/cisco.inc.php.
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```php
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<?php
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$oids = snmpwalk_group($device, 'ciscoEnvMonSupplyStatusTable', 'CISCO-ENVMON-MIB');
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if (!empty($oids)) {
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//Create State Index
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$state_name = 'ciscoEnvMonSupplyState';
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$states = array(
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array('value' => 1, 'generic' => 0, 'graph' => 0, 'descr' => 'normal'),
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array('value' => 2, 'generic' => 1, 'graph' => 0, 'descr' => 'warning'),
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array('value' => 3, 'generic' => 2, 'graph' => 0, 'descr' => 'critical'),
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array('value' => 4, 'generic' => 3, 'graph' => 0, 'descr' => 'shutdown'),
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array('value' => 5, 'generic' => 3, 'graph' => 0, 'descr' => 'notPresent'),
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array('value' => 6, 'generic' => 2, 'graph' => 0, 'descr' => 'notFunctioning'),
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);
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create_state_index($state_name, $states);
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$num_oid = '.1.3.6.1.4.1.9.9.13.1.5.1.3.';
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foreach ($oids as $index => $entry) {
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//Discover Sensors
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discover_sensor($valid['sensor'], 'state', $device, $num_oid.$index, $index, $state_name, $entry['ciscoEnvMonSupplyStatusDescr'], '1', '1', null, null, null, null, $entry['ciscoEnvMonSupplyState'], 'snmp', $index);
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//Create Sensor To State Index
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create_sensor_to_state_index($device, $state_name, $index);
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}
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}
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```
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