1 | <?php |
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2 | /** |
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3 | * SLA.php |
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4 | * |
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5 | * This program is free software: you can redistribute it and/or modify |
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6 | * it under the terms of the GNU General Public License as published by |
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7 | * the Free Software Foundation, either version 3 of the License, or |
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8 | * (at your option) any later version. |
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9 | * |
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10 | * This program is distributed in the hope that it will be useful, |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the |
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13 | * GNU General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License |
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16 | * along with this program. If not, see <https://www.gnu.org/licenses/>. |
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17 | * |
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18 | * @link https://www.librenms.org |
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19 | */ |
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20 | |||
21 | namespace LibreNMS\Modules; |
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22 | |||
23 | use App\Models\Sla; |
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24 | use App\Observers\ModuleModelObserver; |
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25 | use LibreNMS\DB\SyncsModels; |
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26 | use LibreNMS\Interfaces\Discovery\SlaDiscovery; |
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27 | use LibreNMS\Interfaces\Module; |
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28 | use LibreNMS\Interfaces\Polling\SlaPolling; |
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29 | use LibreNMS\OS; |
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30 | |||
31 | class Slas implements Module |
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32 | { |
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33 | use SyncsModels; |
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34 | |||
35 | /** |
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36 | * Discover this module. Heavier processes can be run here |
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37 | * Run infrequently (default 4 times a day) |
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38 | * |
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39 | * @param OS $os |
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40 | */ |
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41 | public function discover(OS $os) |
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42 | { |
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43 | if ($os instanceof SlaDiscovery) { |
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44 | $slas = $os->discoverSlas(); |
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45 | ModuleModelObserver::observe(Sla::class); |
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46 | $this->syncModels($os->getDevice(), 'slas', $slas); |
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47 | } |
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48 | } |
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49 | |||
50 | /** |
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51 | * Poll data for this module and update the DB / RRD. |
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52 | * Try to keep this efficient and only run if discovery has indicated there is a reason to run. |
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53 | * Run frequently (default every 5 minutes) |
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54 | * |
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55 | * @param OS $os |
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56 | */ |
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57 | public function poll(OS $os) |
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58 | { |
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59 | if ($os instanceof SlaPolling) { |
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60 | // Gather our SLA's from the DB. |
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61 | $slas = $os->getDevice()->slas() |
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62 | ->where('deleted', 0)->get(); |
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63 | |||
64 | if ($slas->isNotEmpty()) { |
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65 | // We have SLA's, lets go!!! |
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66 | $os->pollSlas($slas); |
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67 | $os->getDevice()->slas()->saveMany($slas); |
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68 | } |
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69 | } |
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70 | } |
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71 | |||
72 | /** |
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73 | * Remove all DB data for this module. |
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74 | * This will be run when the module is disabled. |
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75 | * |
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76 | * @param OS $os |
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77 | */ |
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78 | public function cleanup(OS $os) |
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79 | { |
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80 | $os->getDevice()->slas()->delete(); |
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81 | } |
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82 | } |
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83 |
Let?s assume that you have a directory layout like this:
and let?s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: