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DB lock v0.2 #685

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jokob-sk
2024-05-30 16:43:15 +10:00
parent 79b81b8bc2
commit 74f1177ec6
6 changed files with 54 additions and 27 deletions
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51
front/php/server/db.php
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@@ -5,45 +5,54 @@
//
// db.php - Front module. Server side. DB common file
//------------------------------------------------------------------------------
# Puche 2021 / 2022+ jokob jokob@duck.com GNU GPLv3
# 2022 jokob jokob@duck.com GNU GPLv3
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// DB File Path
$DBFILE = dirname(__FILE__).'/../../../db/app.db';
$DBFILE_LOCKED_FILE = dirname(__FILE__).'/../../../logs/db_is_locked.log';
$db_locked = false;
//------------------------------------------------------------------------------
// Connect DB
//------------------------------------------------------------------------------
function SQLite3_connect ($trytoreconnect) {
global $DBFILE;
try
{
// connect to database
function SQLite3_connect ($trytoreconnect, $retryCount = 0) {
global $DBFILE, $DBFILE_LOCKED_FILE;
$maxRetries = 5; // Maximum number of retries
$baseDelay = 1; // Base delay in seconds
global $db_locked;
try {
// Connect to database
global $db_locked;
$db_locked = false;
// return new SQLite3($DBFILE, SQLITE3_OPEN_READONLY);
return new SQLite3($DBFILE, SQLITE3_OPEN_READWRITE);
}
catch (Exception $exception)
{
// sqlite3 throws an exception when it is unable to connect
global $db_locked;
// Write unlock status to the locked file
file_put_contents($DBFILE_LOCKED_FILE, '0');
return new SQLite3($DBFILE, SQLITE3_OPEN_READWRITE);
} catch (Exception $exception) {
// sqlite3 throws an exception when it is unable to connect
global $db_locked;
$db_locked = true;
// try to reconnect one time after 3 seconds
if($trytoreconnect)
{
echo '<script>alert("Error connecting to database, will try in 3s")</script>';
sleep(3);
return SQLite3_connect(false);
// Write lock status to the locked file
file_put_contents($DBFILE_LOCKED_FILE, '1');
// Connection failed, check if we should retry
if ($trytoreconnect && $retryCount < $maxRetries) {
// Calculate exponential backoff delay
$delay = $baseDelay * pow(2, $retryCount);
sleep($delay);
// Retry the connection with an increased retry count
return SQLite3_connect(true, $retryCount + 1);
} else {
// Maximum retries reached, hide loading spinner and show failure alert
echo '<script>alert("Failed to connect to database after ' . $retryCount . ' retries.")</script>';
return false; // Or handle the failure appropriately
}
}
}