V1.0 - initial commit

.htaccess

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+<Files ~ "import_log.*">
+	Order allow,deny
+	Deny from all
+</Files>

assets/css/style.css

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+.cvm-debug td.label{
+	width:30%;
+}

index.php

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+<?php 
+/*
+ Plugin Name: YouTube import plugin - debug utility
+ Plugin URI: https://wpythub.com/
+ Description: Debug for YouTube video import plugin. Plugin is available here: https://goo.gl/VeJ5Ff
+ Author: Constantin Boiangiu
+ Version: 1.0
+ Author URI: https://wpythub.com
+ */
+
+// No direct access
+if( !defined( 'ABSPATH' ) ){
+	die();
+}
+
+class CF_VVP_Debug{
+
+	/**
+	 * Store custom post type class reference from main plugin 
+	 * @var cbc_youtube_Post_Type
+	 */
+	private $cpt;
+
+	public function __construct(){
+
+		add_action( 'init', array( $this, 'set_variables' ) );
+
+		// add extra menu pages
+		add_action( 'admin_menu', array( $this, 'menu_pages' ), 10 );
+
+		// process errors sent by the plugin
+		add_action( 'cbc_debug_message', array( $this, 'register_error' ), 10, 3 );
+	}
+
+	/**
+	 * Action 'init' callback
+	 */
+	public function set_variables(){
+		global $CBC_POST_TYPE;
+		if( !$CBC_POST_TYPE ){
+			return;
+		}
+		$this->cpt = $CBC_POST_TYPE;		
+	}
+
+	/**
+	 * Add debug page to main plugin menu
+	 */
+	public function menu_pages(){
+		if( !$this->cpt ){
+			return;
+		}
+
+		$debug = add_submenu_page(
+			'edit.php?post_type=' . $this->cpt->get_post_type(),
+			__('Debug', 'cbc_youtube'),
+			__('Debug', 'cbc_youtube'),
+			'manage_options',
+			'cbc_debug',
+			array( $this, 'debug_page' ) );
+
+		add_action( 'load-' . $debug, array( $this, 'debug_onload' ) );
+
+	}
+
+	/**
+	 * Debug plugin menu page onLoad callback
+	 */
+	public function debug_onload(){
+
+		wp_enqueue_style(
+			'cbc_debug_css',
+			plugin_dir_url( __FILE__ ) . 'assets/css/style.css'				
+		);
+
+		// clear log
+		if( isset( $_GET['cbc_nonce'] ) ){
+			check_admin_referer( 'cbc_reset_error_log', 'cbc_nonce' );
+			$file = plugin_dir_path( __FILE__ ) . 'import_log';
+			$handle = fopen( $file, 'w' );
+			fclose( $handle );
+		}
+
+	}
+
+	/**
+	 * Output debug page
+	 */
+	public function debug_page(){
+		$data = $this->gather_data();
+
+?>
+<div class="wrap">
+	<h1><?php _e( 'Plugin information', 'cbc_youtube' );?></h1>
+	<table class="cvm-debug widefat">
+		<thead>
+			<tr>
+				<th colspan="2"><?php _e( 'WordPress environment', 'cbc_youtube' );?></th>
+			</tr>
+		</thead>
+		<tbody>
+			<?php foreach( $data['wp'] as $d ):?>
+			<tr>
+				<td class="label"><?php echo $d['label'];?></td>
+				<td><?php echo $d['value'];?></td>
+			</tr>
+			<?php endforeach;?>
+		</tbody>
+	</table>
+	<br />
+	<table class="cvm-debug widefat">
+		<thead>
+			<tr>
+				<th colspan="2"><?php _e( 'Plugin', 'cbc_youtube' );?></th>
+			</tr>
+		</thead>
+		<tbody>
+			<?php foreach( $data['plugin'] as $d ):?>
+			<tr>
+				<td class="label"><?php echo $d['label']; ?>:</td>
+				<td><?php echo $d['value']; ?></td>
+			</tr>
+			<?php endforeach;?>
+		</tbody>
+	</table>
+	<br />
+	<table class="cvm-debug widefat">
+		<thead>
+			<tr>
+				<th><?php _e( 'Import log', 'cbc_youtube' );?></th>
+			</tr>
+		</thead>
+		<tbody>
+			<tr>
+				<td>
+					<?php 
+						$file = plugin_dir_path( __FILE__ ) . 'import_log';
+						if( !file_exists( $file ) || filesize( $file ) == 0 ){
+							_e( 'No imports registered.', 'cbc_youtube' );
+						}else{
+							$handle = fopen( $file , 'r' );
+							$content = fread( $handle, filesize( $file ) );
+							fclose( $handle );
+					?>
+							<textarea id="cvm-debug-box" style="width:100%; height:300px;"><?php echo $content;?></textarea>
+							<?php
+								$url = menu_page_url( 'cbc_debug', false );
+								$nonce = wp_create_nonce( 'cbc_reset_error_log' );
+							?>							
+							<a class="button" href="<?php echo $url . '&cbc_nonce=' . $nonce;?>"><?php _e( 'Clear log', 'cbc_youtube' );?></a>
+
+					<?php }?>
+				</td>
+			</tr>
+		</tbody>
+	</table>
+</div>
+<script language="javascript">
+var textarea = document.getElementById('cvm-debug-box');
+textarea.scrollTop = textarea.scrollHeight;
+</script>
+<?php
+	}
+
+	/**
+	 * Store errors in error log
+	 * @param WP_Error $error
+	 */
+	public function register_error( $message, $separator, $data ){
+
+		$error_log = plugin_dir_path( __FILE__ ) . 'import_log';
+		//*
+		if( filesize( $error_log ) >= pow(1024, 2) ){
+			$filename = wp_unique_filename( plugin_dir_path( __FILE__ ), 'import_log' );
+			$result = rename( $error_log , plugin_dir_path( __FILE__ ) . $filename );
+			if( !$result ){
+				//@todo do something in case the file could not be renamed
+			}
+		}
+		//*/
+
+		$handle = fopen( $error_log, "a" );
+		if( false === $handle ){
+			return;
+		}
+
+		$log_entry = sprintf(
+			__( '[%s] %s', 'ccb_youtube' ),
+			date( 'M/d/Y H:i:s' ),
+			$message
+			//"\n" . print_r( $data, true )
+		);
+
+		fwrite( $handle, $log_entry ."\n" );
+
+		fclose( $handle );		
+	}
+
+	/**
+	 * Gather data about the plugin and WP to output it into the debug page
+	 */
+	private function gather_data(){
+
+		global $CBC_AUTOMATIC_IMPORT;
+		$last_import = $CBC_AUTOMATIC_IMPORT->get_update();
+
+		$data = array();
+		$data['wp'] = array(
+			'version' => array(
+				'label' => __( 'WordPress version', 'cbc_youtube' ),
+				'value' => get_bloginfo( 'version' )
+			),
+			'multisite' => array(
+				'label' => __( 'WP Multisite', 'cbc_youtube' ),
+				'value' => ( is_multisite() ? __( 'Yes', 'cbc_youtube' ) : __( 'No', 'cbc_youtube' ) )
+			),
+			'debug' => array(
+				'label' => __( 'WordPress debug', 'cbc_youtube' ),
+				'value' => ( defined( 'WP_DEBUG' ) && WP_DEBUG ? __( 'On', 'cbc_youtube' ) : __( 'Off', 'cbc_youtube' ) )
+			),
+			'cron' => array(
+				'label' => __( 'WP Cron', 'cbc_youtube' ),
+				'value' => ( defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ? __( 'Not allowed', 'cbc_youtube' ) : __( 'Allowed', 'cbc_youtube' ) )
+			)			
+		);
+
+		$data['plugin'] = array(
+
+			'last_import' => array(
+				'label' => __( 'Last automatic import', 'cbc_youtube' ),
+				'value' => sprintf( 
+						'Post id: %s <br />Server time: %s <br> Import time: %s <br> Currently running: %s', 
+						$last_import['post_id'],
+						date( 'M/d/Y H:i:s' ),
+						date( 'M/d/Y H:i:s', $last_import['time'] ),
+						$last_import['running_update'] ? 'Yes' : 'No' 
+				)
+			)
+
+		);
+
+		return $data;
+	}
+
+}
+new CF_VVP_Debug();