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<?php |
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/** |
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* Copyright (c) 2011-present Mediasift Ltd |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* * Neither the names of the copyright holders nor the names of his |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* @category Libraries |
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* @package Storyplayer/Modules/Screen |
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* @author Stuart Herbert <[email protected]> |
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* @copyright 2011-present Mediasift Ltd www.datasift.com |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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* @link http://datasift.github.io/storyplayer |
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*/ |
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namespace Storyplayer\SPv2\Modules\Screen; |
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use DataSift\Storyplayer\HostLib; |
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use DataSift\Storyplayer\OsLib; |
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use DataSift\Stone\DataLib\DataPrinter; |
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use DataSift\Stone\ObjectLib\BaseObject; |
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use GanbaroDigital\TextTools\Filters\FilterColumns; |
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use GanbaroDigital\TextTools\Filters\FilterForMatchingRegex; |
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use GanbaroDigital\TextTools\Filters\FilterForMatchingString; |
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use Storyplayer\SPv2\Modules\Exceptions; |
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use Storyplayer\SPv2\Modules\Host; |
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use Storyplayer\SPv2\Modules\Host\HostAwareModule; |
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use Storyplayer\SPv2\Modules\Log; |
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use Storyplayer\SPv2\Modules\Screen; |
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use Storyplayer\SPv2\Modules\Shell; |
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/** |
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* get information about a given host |
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* |
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* @category Libraries |
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* @package Storyplayer/Modules/Screen |
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* @author Stuart Herbert <[email protected]> |
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* @copyright 2011-present Mediasift Ltd www.datasift.com |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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* @link http://datasift.github.io/storyplayer |
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*/ |
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class FromScreen extends HostAwareModule |
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{ |
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/** |
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* @param string $sessionName |
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* @return bool |
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*/ |
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public function getScreenIsRunning($sessionName) |
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{ |
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// what are we doing? |
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$log = Log::usingLog()->startAction("check if screen session '{$sessionName}' is still running"); |
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// get the details |
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$sessionData = Screen::fromHost($this->args[0])->getScreenSessionDetails($sessionName); |
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// all done |
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if ($sessionData) { |
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$log->endAction("still running"); |
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return true; |
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} |
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else { |
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$log->endAction("not running"); |
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return false; |
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} |
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} |
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/** |
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* @param string $sessionName |
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* @return BaseObject|null |
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*/ |
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public function getScreenSessionDetails($sessionName) |
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{ |
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// what are we doing? |
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$log = Log::usingLog()->startAction("get details about screen session '{$sessionName}' on host '{$this->args[0]}' from Storyplayer"); |
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// are there any details? |
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$cmd = "screen -ls"; |
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$result = Shell::onHost($this->args[0])->runCommandAndIgnoreErrors($cmd); |
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// NOTE: |
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// |
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// screen is not a well-behaved UNIX program, and its exit code |
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// can be non-zero when everything is good |
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if (empty($result->output)) { |
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$msg = "unable to get list of screen sessions"; |
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return null; |
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} |
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// do we have the session we are looking for? |
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$lines = explode("\n", $result->output); |
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$lines = FilterForMatchingRegex::against($lines, "/[0-9]+\\.{$sessionName}\t/"); |
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$lines = FilterColumns::from($lines, "0", '.'); |
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if (empty($lines)) { |
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$msg = "screen session '{$sessionName}' is not running"; |
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$log->endAction($msg); |
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return null; |
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} |
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// there might be |
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$processDetails = new BaseObject; |
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$processDetails->hostId = $this->args[0]; |
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$processDetails->name = $sessionName; |
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$processDetails->type = 'screen'; |
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$processDetails->pid = trim(rtrim($lines[0])); |
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// all done |
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$log->endAction("session is running as PID '{$processDetails->pid}'"); |
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return $processDetails; |
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} |
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/** |
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* @return array<object> |
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*/ |
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public function getAllScreenSessions() |
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{ |
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// what are we doing? |
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$log = Log::usingLog()->startAction("get details about all screen sessions on host '{$this->args[0]}'"); |
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// are there any details? |
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$cmd = "screen -ls"; |
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$result = Shell::onHost($this->args[0])->runCommandAndIgnoreErrors($cmd); |
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// NOTE: |
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// |
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// screen is not a well-behaved UNIX program, and its exit code |
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// can be non-zero when everything is good |
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if (empty($result->output)) { |
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$msg = "unable to get list of screen sessions"; |
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$log->endAction($msg); |
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return []; |
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} |
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// reduce the output down to a list of sessions |
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$lines = explode("\n", $result->output); |
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$lines = FilterForMatchingRegex::against($lines, "/[0-9]+.+\t/"); |
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if (empty($lines)) { |
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$msg = "no screen processes running"; |
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$log->endAction($msg); |
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return []; |
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} |
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$retval = []; |
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foreach ($lines as $line) { |
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$parts = explode('.', $line); |
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$processDetails = new BaseObject; |
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$processDetails->hostId = $this->args[0]; |
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$processDetails->type = 'screen'; |
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$processDetails->pid = trim($parts[0]); |
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$processDetails->name = rtrim($parts[1]); |
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$retval[] = $processDetails; |
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} |
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// all done |
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$log->endAction("found " . count($retval) . " screen process(es)"); |
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// all done |
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return $retval; |
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} |
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} |
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datasift /
storyplayer
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.