1 | <?php |
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2 | /** |
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3 | * PingCheck.php |
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4 | * |
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5 | * Device up/down icmp check job |
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6 | * |
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7 | * This program is free software: you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation, either version 3 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * @package LibreNMS |
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21 | * @link http://librenms.org |
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22 | * @copyright 2018 Tony Murray |
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23 | * @author Tony Murray <[email protected]> |
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24 | */ |
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25 | |||
26 | namespace App\Jobs; |
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27 | |||
28 | use App\Models\Device; |
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29 | use Carbon\Carbon; |
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30 | use Illuminate\Bus\Queueable; |
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31 | use Illuminate\Contracts\Queue\ShouldQueue; |
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32 | use Illuminate\Database\Eloquent\Builder; |
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33 | use Illuminate\Foundation\Bus\Dispatchable; |
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34 | use Illuminate\Queue\InteractsWithQueue; |
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35 | use Illuminate\Queue\SerializesModels; |
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36 | use Illuminate\Support\Collection; |
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37 | use LibreNMS\Config; |
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38 | use LibreNMS\RRD\RrdDefinition; |
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39 | use Symfony\Component\Process\Process; |
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40 | |||
41 | class PingCheck implements ShouldQueue |
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42 | { |
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43 | use Dispatchable, InteractsWithQueue, Queueable, SerializesModels; |
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44 | |||
45 | private $process; |
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46 | private $rrd_tags; |
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47 | |||
48 | /** @var \Illuminate\Database\Eloquent\Collection $devices List of devices keyed by hostname */ |
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49 | private $devices; |
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50 | /** @var array $groups List of device group ids to check */ |
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51 | private $groups = []; |
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52 | |||
53 | // working data for loop |
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54 | /** @var Collection $tiered */ |
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55 | private $tiered; |
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56 | /** @var Collection $current */ |
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57 | private $current; |
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58 | private $current_tier; |
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59 | /** @var Collection $deferred */ |
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60 | private $deferred; |
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61 | |||
62 | /** |
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63 | * Create a new job instance. |
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64 | * |
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65 | * @param array $groups List of distributed poller groups to check |
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66 | */ |
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67 | public function __construct($groups = []) |
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68 | { |
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69 | if (is_array($groups)) { |
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70 | $this->groups = $groups; |
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71 | } |
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72 | |||
73 | // define rrd tags |
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74 | $rrd_step = Config::get('ping_rrd_step', Config::get('rrd.step', 300)); |
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75 | $rrd_def = RrdDefinition::make()->addDataset('ping', 'GAUGE', 0, 65535, $rrd_step * 2); |
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76 | $this->rrd_tags = ['rrd_def' => $rrd_def, 'rrd_step' => $rrd_step]; |
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77 | |||
78 | // set up fping process |
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79 | $timeout = Config::get('fping_options.timeout', 500); // must be smaller than period |
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80 | $retries = Config::get('fping_options.retries', 2); // how many retries on failure |
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81 | |||
82 | $cmd = ['fping', '-f', '-', '-e', '-t', $timeout, '-r', $retries]; |
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83 | |||
84 | $wait = Config::get('rrd.step', 300) * 2; |
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85 | |||
86 | $this->process = new Process($cmd, null, null, null, $wait); |
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87 | } |
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88 | |||
89 | /** |
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90 | * Execute the job. |
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91 | * |
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92 | * @return void |
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93 | */ |
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94 | public function handle() |
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95 | { |
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96 | $ping_start = microtime(true); |
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97 | |||
98 | $this->fetchDevices(); |
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99 | |||
100 | d_echo($this->process->getCommandLine() . PHP_EOL); |
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101 | |||
102 | // send hostnames to stdin to avoid overflowing cli length limits |
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103 | $ordered_device_list = $this->tiered->get(1, collect())->keys()// root nodes before standalone nodes |
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104 | ->merge($this->devices->keys()) |
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105 | ->unique() |
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106 | ->implode(PHP_EOL); |
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107 | |||
108 | $this->process->setInput($ordered_device_list); |
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109 | $this->process->start(); // start as early as possible |
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110 | |||
111 | foreach ($this->process as $type => $line) { |
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112 | d_echo($line); |
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113 | |||
114 | if (Process::ERR === $type) { |
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115 | // Check for devices we couldn't resolve dns for |
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116 | if (preg_match('/^(?<hostname>[^\s]+): (?:Name or service not known|Temporary failure in name resolution)/', $line, $errored)) { |
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117 | $this->recordData([ |
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118 | 'hostname' => $errored['hostname'], |
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119 | 'status' => 'unreachable' |
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120 | ]); |
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121 | } |
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122 | continue; |
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123 | } |
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124 | |||
125 | if (preg_match( |
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126 | '/^(?<hostname>[^\s]+) is (?<status>alive|unreachable)(?: \((?<rtt>[\d.]+) ms\))?/', |
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127 | $line, |
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128 | $captured |
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129 | )) { |
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130 | $this->recordData($captured); |
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131 | |||
132 | $this->processTier(); |
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133 | } |
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134 | } |
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135 | |||
136 | // check for any left over devices |
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137 | if ($this->deferred->isNotEmpty()) { |
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138 | d_echo("Leftover devices, this shouldn't happen: " . $this->deferred->flatten(1)->implode('hostname', ', ') . PHP_EOL); |
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139 | d_echo("Devices left in tier: " . collect($this->current)->implode('hostname', ', ') . PHP_EOL); |
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140 | } |
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141 | |||
142 | if (\App::runningInConsole()) { |
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143 | printf("Pinged %s devices in %.2fs\n", $this->devices->count(), microtime(true) - $ping_start); |
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144 | } |
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145 | } |
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146 | |||
147 | private function fetchDevices() |
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148 | { |
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149 | if (isset($this->devices)) { |
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150 | return $this->devices; |
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151 | } |
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152 | |||
153 | global $vdebug; |
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154 | |||
155 | /** @var Builder $query */ |
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156 | $query = Device::canPing() |
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157 | ->select(['devices.device_id', 'hostname', 'status', 'status_reason', 'last_ping', 'last_ping_timetaken', 'max_depth']) |
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158 | ->orderBy('max_depth'); |
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159 | |||
160 | if ($this->groups) { |
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161 | $query->whereIn('poller_group', $this->groups); |
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162 | } |
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163 | |||
164 | $this->devices = $query->get()->keyBy('hostname'); |
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165 | |||
166 | // working collections |
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167 | $this->tiered = $this->devices->groupBy('max_depth', true); |
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168 | $this->deferred = collect(); |
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169 | |||
170 | // start with tier 1 (the root nodes, 0 is standalone) |
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171 | $this->current_tier = 1; |
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172 | $this->current = $this->tiered->get($this->current_tier, collect()); |
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173 | |||
174 | if ($vdebug) { |
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175 | $this->tiered->each(function (Collection $tier, $index) { |
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176 | echo "Tier $index (" . $tier->count() . "): "; |
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177 | echo $tier->implode('hostname', ', '); |
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178 | echo PHP_EOL; |
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179 | }); |
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180 | } |
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181 | |||
182 | return $this->devices; |
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183 | } |
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184 | |||
185 | /** |
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186 | * Check if this tier is complete and move to the next tier |
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187 | * If we moved to the next tier, check if we can report any of our deferred results |
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188 | */ |
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189 | private function processTier() |
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190 | { |
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191 | global $vdebug; |
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0 ignored issues
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Compatibility
Best Practice
introduced
by
Use of
global functionality is not recommended; it makes your code harder to test, and less reusable.
Instead of relying on 1. Pass all data via parametersfunction myFunction($a, $b) {
// Do something
}
2. Create a class that maintains your stateclass MyClass {
private $a;
private $b;
public function __construct($a, $b) {
$this->a = $a;
$this->b = $b;
}
public function myFunction() {
// Do something
}
}
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192 | |||
193 | if ($this->current->isNotEmpty()) { |
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194 | return; |
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195 | } |
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196 | |||
197 | $this->current_tier++; // next tier |
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198 | |||
199 | if (!$this->tiered->has($this->current_tier)) { |
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200 | // out of devices |
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201 | return; |
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202 | } |
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203 | |||
204 | if ($vdebug) { |
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205 | echo "Out of devices at this tier, moving to tier $this->current_tier\n"; |
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206 | } |
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207 | |||
208 | $this->current = $this->tiered->get($this->current_tier); |
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209 | |||
210 | // update and remove devices in the current tier |
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211 | foreach ($this->deferred->pull($this->current_tier, []) as $data) { |
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212 | $this->recordData($data); |
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213 | } |
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214 | |||
215 | // try to process the new tier in case we took care of all the devices |
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216 | $this->processTier(); |
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217 | } |
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218 | |||
219 | /** |
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220 | * If the device is on the current tier, record the data and remove it |
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221 | * $data should have keys: hostname, status, and conditionally rtt |
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222 | * |
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223 | * @param $data |
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224 | */ |
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225 | private function recordData($data) |
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226 | { |
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227 | global $vdebug; |
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0 ignored issues
–
show
Compatibility
Best Practice
introduced
by
Use of
global functionality is not recommended; it makes your code harder to test, and less reusable.
Instead of relying on 1. Pass all data via parametersfunction myFunction($a, $b) {
// Do something
}
2. Create a class that maintains your stateclass MyClass {
private $a;
private $b;
public function __construct($a, $b) {
$this->a = $a;
$this->b = $b;
}
public function myFunction() {
// Do something
}
}
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228 | |||
229 | if ($vdebug) { |
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230 | echo "Attempting to record data for {$data['hostname']}... "; |
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231 | } |
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232 | |||
233 | /** @var Device $device */ |
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234 | $device = $this->devices->get($data['hostname']); |
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235 | |||
236 | // process the data if this is a standalone device or in the current tier |
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237 | if ($device->max_depth === 0 || $this->current->has($device->hostname)) { |
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238 | if ($vdebug) { |
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239 | echo "Success\n"; |
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240 | } |
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241 | |||
242 | // mark up only if snmp is not down too |
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243 | $device->status = ($data['status'] == 'alive' && $device->status_reason != 'snmp'); |
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244 | $device->last_ping = Carbon::now(); |
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245 | $device->last_ping_timetaken = isset($data['rtt']) ? $data['rtt'] : 0; |
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246 | |||
247 | if ($device->isDirty('status')) { |
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248 | // if changed, update reason |
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249 | $device->status_reason = $device->status ? '' : 'icmp'; |
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250 | $type = $device->status ? 'up' : 'down'; |
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251 | log_event('Device status changed to ' . ucfirst($type) . " from icmp check.", $device->toArray(), $type); |
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252 | |||
253 | echo "Device $device->hostname changed status to $type, running alerts\n"; |
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254 | RunRules($device->device_id); |
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255 | } |
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256 | $device->save(); // only saves if needed (which is every time because of last_ping) |
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257 | |||
258 | // add data to rrd |
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259 | data_update($device->toArray(), 'ping-perf', $this->rrd_tags, ['ping' => $device->last_ping_timetaken]); |
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260 | |||
261 | // done with this device |
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262 | $this->complete($device->hostname); |
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263 | d_echo("Recorded data for $device->hostname (tier $device->max_depth)\n"); |
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264 | } else { |
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265 | if ($vdebug) { |
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266 | echo "Deferred\n"; |
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267 | } |
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268 | |||
269 | $this->defer($data); |
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270 | } |
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271 | } |
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272 | |||
273 | /** |
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274 | * Done processing $hostname, remove it from our active data |
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275 | * |
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276 | * @param $hostname |
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277 | */ |
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278 | private function complete($hostname) |
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279 | { |
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280 | $this->current->offsetUnset($hostname); |
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281 | $this->deferred->each->offsetUnset($hostname); |
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282 | } |
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283 | |||
284 | /** |
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285 | * Defer this data processing until all parent devices are complete |
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286 | * |
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287 | * |
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288 | * @param $data |
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289 | */ |
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290 | private function defer($data) |
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291 | { |
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292 | $device = $this->devices->get($data['hostname']); |
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293 | |||
294 | if ($this->deferred->has($device->max_depth)) { |
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295 | // add this data to the proper tier, unless it already exists... |
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296 | $tier = $this->deferred->get($device->max_depth); |
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297 | if (!$tier->has($device->hostname)) { |
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298 | $tier->put($device->hostname, $data); |
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299 | } |
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300 | } else { |
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301 | // create a new tier containing this data |
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302 | $this->deferred->put($device->max_depth, collect([$device->hostname => $data])); |
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303 | } |
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304 | } |
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305 | } |
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306 |
Instead of relying on
global
state, we recommend one of these alternatives:1. Pass all data via parameters
2. Create a class that maintains your state