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<?php
/**
* News Article Source Fetcher
*
* This script is designed to extract the content of news articles from various French media sources.
* The URLs of these articles are retrieved from the `base_news` table, where articles marked with
* a `step` value of '0' are pending extraction.
*
* Once extracted, the content of each article is saved locally for further processing. This separation
* of content fetching and processing is intentional to optimize resource management.
*
* The script operates in batches, processing a defined number of entries (`NB_BY_STEP`) at a time.
* After extraction, the `step` value of the processed articles is updated to '1' to indicate completion.
*
* For performance monitoring, the script outputs the processed article IDs, URLs, and calculates the average
* processing time per article.
*
* @author Guillaume Eckendoerffer
* @date 07-09-2023
*/
// Include the database functions
include( "functions_mysqli.php" );
// Initialize global variables
const NB_BY_STEP = 20; // nb per steep
$last = date( "U" );
$path = $_SERVER['DOCUMENT_ROOT'];
// Capture the start time for performance monitoring
$time_start = microtime( true );
// Fetch a batch of unprocessed news entries
$return ='';
$result = mysqli_query( $mysqli, "SELECT `id`, `url` FROM `base_news` WHERE `step`='0' ORDER BY RAND() LIMIT " . NB_BY_STEP );
while ( $row = mysqli_fetch_assoc( $result ) ) {
$id_source = $row["id"];
$url = trim( $row["url"] );
$time_start_item = microtime( true );
// Mark the news entry as being processed
mysqli_query( $mysqli, "UPDATE `base_news` SET `step`='1' WHERE `id`='$id_source' LIMIT 1" );
// Fetch the content of the news URL
$data = file_get_contents( trim( $url ) );
// Save the fetched data to a local file
$inF = fopen( "$path/sources/html_news/$id_source.txt", "w" );
fwrite( $inF, $data );
fclose( $inF );
$time_item = number_format( ( microtime( true ) - $time_start_item ) , 3, ',', '' ) . 's';
// Output the ID and URL for monitoring purposes
$return .= "($id_source) [$time_item] $url <br />";
}
// Fetch the count of news entries that haven't been processed
$nb_base = mysqli_return_number( $mysqli, "SELECT `id` FROM `base_news` WHERE `step`='0'" );
// Calculate and display the processing time
$time = number_format( ( ( microtime( true ) - $time_start ) / NB_BY_STEP ), 3, ',', '' ) .'s/item';
echo "<head><title>Rem: $nb_base - $time</title></head> $return";
// If no more entries are found, exit, else move to the next processing step
if ( !isset( $id_source ) ) exit;
echo "<script type=\"text/javascript\">location.href='" . $_SERVER ['REQUEST_URI'] . "';</script>";
?>
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