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ðŸ“„ data-migration.php(14.5 KB)
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ðŸ“„ migration-contract.php(177 B)
ðŸ“„ migration.php(7.97 KB)

Editing: data-migration.php

<?php

namespace WP_Social\Xs_Migration;

/**
 * Class Data_Migration
 *
 * @package WP_Social\Xs_Migration
 */
abstract class Data_Migration implements Migration_Contract {

const STATUS_DONE       = 'done';
	const STATUS_QUEUED     = 'queued';
	const STATUS_RUNNING    = 'running';

const STATUS_FINISHED   = 'finished';
	const STATUS_INITIATED  = 'initiated';

const STATUS_METHOD_PAUSED      = 'paused';
	const STATUS_METHOD_EXECUTED    = 'executed';
	const STATUS_METHOD_EXECUTING   = 'executing';

/**
	 * @param $txtDomain
	 * @param $versionFrom
	 * @param $versionTo
	 *
	 * @return mixed
	 */
	public function input($txtDomain, $versionFrom, $versionTo) {

#$versionFrom = '1.1.9';
		#$versionTo   = '1.2.0';
		$optionKey = 'data_migration_'.$txtDomain.'_log';

$from   = str_replace('.', '_', trim($versionFrom));
		$to     = str_replace('.', '_', trim($versionTo));

$frm = $this->makeFullVersionKey($from);
		$trm = $this->makeFullVersionKey($to);

$log        = [];
		$verCache   = [];
		$exPKey     = $frm.'_'.$trm;

$verCache['o_from'] = $versionFrom;
		$verCache['u_from'] = $from;
		$verCache['p_from'] = $frm;
		$verCache['o_to']   = $versionTo;
		$verCache['u_to']   = $to;
		$verCache['p_to']   = $trm;

$existingOption = get_option($optionKey);

if(!$existingOption) {

$existingOption             = [];
			$existingOption['status']   = self::STATUS_INITIATED;
			$existingOption['plan_key'] = $exPKey;

$cStack = $this->getCallStacks([], $frm, $trm);

$existingOption['map'] = $cStack['map'];

$existingOption['execution_plan'][$exPKey]['status']    = self::STATUS_RUNNING;
			$existingOption['execution_plan'][$exPKey]['stack']     = $cStack['stack'];
			$existingOption['execution_plan'][$exPKey]['available'] = $cStack['func'];
			$existingOption['execution_plan'][$exPKey]['executing'] = '';
			$existingOption['execution_plan'][$exPKey]['executed']  = [];
			$existingOption['execution_plan'][$exPKey]['failed']    = [];
			$existingOption['execution_plan'][$exPKey]['progress']  = [];
			$existingOption['execution_plan'][$exPKey]['log']       = [];
			$existingOption['execution_plan'][$exPKey]['version']   = $verCache;

$existingOption['plan_log'][$exPKey] = 'Execution plan '.$exPKey. ' initiated at '.date('Y-m-d H:i:s'). ' .' . PHP_EOL;

$log[] = 'Conversion initiated for version '. $versionFrom .' to '. $versionTo. ' at '.date('Y-m-d H:i:s').'.';
			$log[] = 'Execution plan prepared.';
			$log[] = 'Execution plan saved into database.';

if(empty($existingOption['execution_plan'][$exPKey]['stack'])) {

$log[] = '- No Conversion method found for '. $versionFrom .' to '. $versionTo .'';
				$log[] = '-- exiting....';
				$log[] = 'Execution plan executed at '.date('Y-m-d H:i:s').'.';
				$log[] = '----------------------------------------------------------';

$existingOption['execution_plan'][$exPKey]['status'] = self::STATUS_FINISHED;
				$existingOption['execution_plan'][$exPKey]['log']   = $log;
				$existingOption['plan_log'][$exPKey] .= 'Execution plan '.$exPKey. ' finished at '.date('Y-m-d H:i:s'). ' .' . PHP_EOL;
				$existingOption['status']   = self::STATUS_FINISHED;

//update_option($optionKey, $existingOption);

return [
					'status' => 'success',
					'log' => $log,
				];
			}

$curExecMethod = array_shift($existingOption['execution_plan'][$exPKey]['stack']);

$existingOption['execution_plan'][$exPKey]['executing'] = $curExecMethod;
			$existingOption['execution_plan'][$exPKey]['progress'][$curExecMethod] = [
				'status' => self::STATUS_QUEUED,
				'check_list' => [],
			];

$log[] = 'Execution plan '.$exPKey.' has started at '.date('Y-m-d H:i:s').'.';
			$log[] = '- Conversion method '. $curExecMethod . ' entered into queue at '.date('Y-m-d H:i:s').'.';
			$log[] = '-- Method '.$curExecMethod.' is executing....';

$existingOption['execution_plan'][$exPKey]['log'] = $log;
			$existingOption['execution_plan'][$exPKey]['log'][] = '-- ....';
			$existingOption['execution_plan'][$exPKey]['progress'][$curExecMethod]['status'] = self::STATUS_METHOD_EXECUTING;

//update_option($optionKey, $existingOption);

return $this->$curExecMethod($optionKey, $exPKey, $existingOption);
			//return $existingOption;
		}

#We have reached this point,
		#this means we do not have previously saved progress into database
		#Now we are checking the status of the execution plan....

if($existingOption['status'] === self::STATUS_INITIATED) {

#this is the initiated plan key, it must be defined by the programmer when status is set to initiated.
			$planKey    = $existingOption['plan_key'];
			$planStat   = $existingOption['execution_plan'][$planKey]['status'];
			$log        = $existingOption['execution_plan'][$planKey]['log'];

if($planStat === self::STATUS_DONE) {

#the execution plan has been executed but some how the status of the migration status is not finished
				#If a plan is done then migration status must be finished............................................
				#So we will do nothing but change the migration status finished......................................
				#though this should never happened...................................................................

$existingOption['status'] = self::STATUS_FINISHED;

$log[] = '-- ! Migration status is initiated but execution plan ' .$planKey. ' is finished. This is a potential bug, we are finishing the execution plan at '.date('Y-m-d H:i:s');
				$log[] = '------------------------------------------------------------------------------';

$existingOption['execution_plan'][$planKey]['log'] = $log;

//update_option($optionKey, $existingOption);

return [
					'status' => 'success',
					'log' => $log,
				];
			}

#Execution plan is not finished................
			#We will execute all the methods from stack....
			$mtdKey     = $existingOption['execution_plan'][$planKey]['executing'];
			$mtdStat    = $existingOption['execution_plan'][$planKey]['progress'][$mtdKey]['status'];

if($mtdStat == self::STATUS_QUEUED || $mtdStat == self::STATUS_METHOD_PAUSED) {

$existingOption['execution_plan'][$planKey]['progress'][$mtdKey] = [
					'status' => self::STATUS_METHOD_EXECUTING,
				];

//update_option($optionKey, $existingOption);

return $this->$mtdKey($optionKey, $planKey, $existingOption);
			}

if($mtdStat == self::STATUS_METHOD_EXECUTING) {

#Someone initiated the method execution, so in this interval we will do nothing.
				return $log;
			}

if($mtdStat == self::STATUS_METHOD_EXECUTED) {

#the method we were executing and it was finished, now we will enter new method in execution queue.
				#this method will enter into executed stack...................................................

$existingOption['execution_plan'][$planKey]['executed'][] = $mtdKey;
				$existingOption['execution_plan'][$planKey]['executing'] = '';

if(empty($existingOption['execution_plan'][$planKey]['stack'])) {

#All the method from call stack has been executed
					#Now we will finish the plan and the migration...

$existingOption['status'] = self::STATUS_FINISHED;
					$existingOption['execution_plan'][$planKey]['status'] = self::STATUS_DONE;
					//$existingOption['execution_plan'][$planKey]['version'] = $verCache;
					$existingOption['plan_key'] = '';

$log[] = 'Conversion method '.$mtdKey.' has finished all its conversion and check list.';
					$log[] = 'Calling stack is finished.';
					$log[] = 'Execution plan executed and data conversion from '.$verCache['o_from']. ' to '.$verCache['o_to'].' at '.date('Y-m-d H:i:s').'.';
					$log[] = '...................................................................................';

$existingOption['execution_plan'][$planKey]['log'] = $log;

//update_option($optionKey, $existingOption);

return [
						'status' => 'success',
						'log' => $log,
					];
				}

#Call stack is not finished,
				#So we will queued the next method from stack

$nx = array_pop($existingOption['execution_plan'][$planKey]['stack']);

$existingOption['execution_plan'][$planKey]['executing'] = $nx;

$existingOption['execution_plan'][$planKey]['progress'][$nx] = [
					'status' => self::STATUS_METHOD_EXECUTING,
					'check_list' => [],
				];

$log[] = '- Conversion method '. $nx . ' entered into queue at '.date('Y-m-d H:i:s').'.';
				$log[] = '-- Method '. $nx. ' is executing...';

$existingOption['execution_plan'][$planKey]['log'] = $log;
				$existingOption['execution_plan'][$planKey]['log'][] = '-- ....';

//update_option($optionKey, $existingOption);

return $this->$nx($optionKey, $planKey, $existingOption);
			}

return [
				'status' => 'error',
				'log' => [
					'Execution mtdStat error, method undefined.'
				],
			];
		}

if($existingOption['status'] === self::STATUS_FINISHED) {

#In scenario could happen like someone initiated plan 001003003_001003004
			#and now they want to migrate/initiate plan 001003004_001003005..........
			#........................................................................

if(empty($existingOption['execution_plan'][$exPKey])) {

$existingOption['status']   = self::STATUS_INITIATED;
				$existingOption['plan_key'] = $exPKey;

$cStack = $this->getCallStacks([], $frm, $trm);

$existingOption['map'] = $cStack['map'];

$existingOption['execution_plan'][$exPKey]['status']    = self::STATUS_RUNNING;
				$existingOption['execution_plan'][$exPKey]['stack']     = $cStack['stack'];
				$existingOption['execution_plan'][$exPKey]['available'] = $cStack['func'];
				$existingOption['execution_plan'][$exPKey]['executing'] = '';
				$existingOption['execution_plan'][$exPKey]['executed']  = [];
				$existingOption['execution_plan'][$exPKey]['failed']    = [];
				$existingOption['execution_plan'][$exPKey]['progress']  = [];
				$existingOption['execution_plan'][$exPKey]['log']       = [];
				$existingOption['execution_plan'][$exPKey]['version']   = $verCache;

$existingOption['plan_log'][$exPKey] = 'Execution plan '.$exPKey. ' initiated at '.date('Y-m-d H:i:s'). ' .' . PHP_EOL;

$log[] = 'Conversion initiated for version '. $versionFrom .' to '. $versionTo. ' at '.date('Y-m-d H:i:s').'.';
				$log[] = 'Execution plan prepared.';
				$log[] = 'Execution plan saved into database.';

if(empty($existingOption['execution_plan'][$exPKey]['stack'])) {

$log[] = '- No Conversion method found for '. $versionFrom .' to '. $versionTo .'';
					$log[] = '-- exiting the execution plan....';
					$log[] = 'Calling stack is finished.';
					$log[] = 'Execution plan executed and data conversion from '.$versionFrom. ' to '.$versionTo.' at '.date('Y-m-d H:i:s').'.';
					$log[] = '...................................................................................';

$existingOption['execution_plan'][$exPKey]['status'] = self::STATUS_FINISHED;
					$existingOption['execution_plan'][$exPKey]['log']   = $log;
					$existingOption['plan_log'][$exPKey] .= 'Execution plan '.$exPKey. ' finished at '.date('Y-m-d H:i:s'). ' .' . PHP_EOL;
					$existingOption['status']   = self::STATUS_FINISHED;

//update_option($optionKey, $existingOption);

return [
						'status' => 'success',
						'log' => $log,
					];
				}

$curExecMethod = array_shift($existingOption['execution_plan'][$exPKey]['stack']);

$existingOption['execution_plan'][$exPKey]['executing'] = $curExecMethod;
				$existingOption['execution_plan'][$exPKey]['progress'][$curExecMethod] = [
					'status' => self::STATUS_QUEUED,
					'check_list' => [],
				];

$log[] = 'Execution plan '.$exPKey.' has started at '.date('Y-m-d H:i:s').'.';
				$log[] = '- Conversion method '. $curExecMethod . ' entered into queue at '.date('Y-m-d H:i:s').'.';
				$log[] = '-- Method '.$curExecMethod.' is executing....';

$existingOption['execution_plan'][$exPKey]['log'] = $log;
				$existingOption['execution_plan'][$exPKey]['log'][] = '-- ....';
				$existingOption['execution_plan'][$exPKey]['progress'][$curExecMethod]['status'] = self::STATUS_METHOD_EXECUTING;

//update_option($optionKey, $existingOption);

return $this->$curExecMethod($optionKey, $exPKey, $existingOption);
				//return $existingOption;
			}

#This is the scenario where migration status is finished
			#and there are also configuration with execution plan
			#.......................................................

#Now execution plan could be finished
			#that means user already migrated version $from to $to [e.g 1.3.4 to 1.3.5]
			#and they again trying to migrate same version to version
			#..........................................................................
			if($existingOption['execution_plan'][$exPKey]['status'] === self::STATUS_DONE) {

return [
					'status' => 'success',
					'log' => $existingOption['execution_plan'][$exPKey]['log'],
				];
			}

#In no scenario this should happened, only when there is a mistake from programmer or corrupt data.

return [
				'status' => 'error',
				'log' => [
					'Could not act on given request. Logical flow detected.'
				],
			];
		}

return [
			'status' => 'error',
			'log' => [
				'Exiting...data is corrupted.'
			],
		];
	}

/**
	 *
	 * @param array $data
	 */
	public function output(array $data) {

if(!empty($data['option'])) {

foreach($data['option'] as $opKey => $opVal) {

update_option($opKey, $opVal);
			}
		}
	}

/**
	 *
	 * @param $versionMap
	 * @param $frm
	 * @param $trm
	 *
	 * @return array
	 */
	private function getCallStacks($versionMap, $frm, $trm) {

$callStack = [];
		$conversionMethods = [];
		$methods = get_class_methods($this);

foreach($methods as $method) {

if(substr($method, 0, 13) === 'convert_from_') {

$conversionMethods[] = $method;

$tmp = str_replace('convert_from_', '', $method);
				$tmp = explode('_to_', $tmp);

$vl = $this->makeFullVersionKey($tmp[0]);
				$vh = $this->makeFullVersionKey($tmp[1]);

$versionMap[$vl] = $tmp[0];
				$versionMap[$vh] = $tmp[1];
			}
		}

ksort($versionMap);

foreach($versionMap as $k => $v) {

if($k >= $frm && $k < $trm) {

$fnc = '';

foreach($conversionMethods as $conversionMethod) {

if(strpos($conversionMethod, 'convert_from_'.$v) !== false) {

$fnc = $conversionMethod;

break;
					}
				}

if(!empty($fnc)) {
					$callStack[] = $fnc;
				}
			}
		}

return [
			'map' => $versionMap,
			'func' => $conversionMethods,
			'stack' => $callStack,
		];
	}

/**
	 *
	 * @param $string
	 *
	 * @return string
	 */
	public function makeFullVersionKey($string) {

$fr = explode('_', $string);

$frm = array_map(function($item){
			return str_pad($item, 3, '0', STR_PAD_LEFT);
		}, $fr);

return implode('', $frm);
	}

}

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