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Create a checksum of the config file in memory #34146

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Create a checksum of the config file in memory #34146

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ee7bbd0
Create a checksum of the config file in memory
ativarsoft Sep 19, 2022
36ea89d
Check if config file exists
ativarsoft Sep 19, 2022
d59779d
Changed comment style
ativarsoft Sep 21, 2022
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29 changes: 28 additions & 1 deletion lib/private/Config.php
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,8 @@ class Config {
protected $configFileName;
/** @var bool */
protected $isReadOnly;
/** @var int */
protected $lastChecksum;

/**
* @param string $configDir Path to the config dir, needs to end with '/'
Expand Down Expand Up @@ -258,10 +260,23 @@ private function writeData() {
throw new HintException(sprintf('Configuration was not read or initialized correctly, not overwriting %s', $this->configFilePath));
}

// This creates a checksum of the config file in memory.
// The config file opcache code is only invalidated if the
// config file data has been changed therefore all the other
// code that depend on the the config file opcode will not
// be recompiled.
$data = var_export($this->cache, true);

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$currentChecksum = crc32($data);

if ($this->getLastChecksum() == $currentChecksum)
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This will never be true, the checksum computed from file use the whole file content while the current one use only the data.

return;

$this->lastChecksum = $currentChecksum;

// Create a php file ...
$content = "<?php\n";
$content .= '$CONFIG = ';
$content .= var_export($this->cache, true);
$content .= $data;
$content .= ";\n";

touch($this->configFilePath);
Expand Down Expand Up @@ -304,4 +319,16 @@ private function checkReadOnly(): void {
'Unset "config_is_read_only" to allow changes to the config file.');
}
}

private function getLastChecksum(): int {
if ($this->lastChecksum == null) {
if (file_exists($this->configFilePath)) {
$data = file_get_contents($this->configFilePath);
$this->lastChecksum = crc32($data);
} else {
$this->lastChecksum = 0;
}
}
return $this->lastChecksum;
}
}