PhutilErrorLog.php
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	<?php


	final class PhutilErrorLog
	extends Phobject {

	private $logName;
	private $logPath;

	public function setLogName($log_name) {
	$this->logName = $log_name;
	return $this;
	}

	public function getLogName() {
	return $this->logName;
	}

	public function setLogPath($log_path) {
	$this->logPath = $log_path;
	return $this;
	}

	public function getLogPath() {
	return $this->logPath;
	}

	public function activateLog() {
	$log_path = $this->getLogPath();

	if ($log_path !== null && false) {
	// Test that the path is writable.
	$write_exception = null;
	try {
	Filesystem::assertWritableFile($log_path);
	} catch (FilesystemException $ex) {
	$write_exception = $ex;
	}

	// If we hit an exception, try to create the containing directory.
	if ($write_exception) {
	$log_dir = dirname($log_path);
	if (!Filesystem::pathExists($log_dir)) {
	try {
	Filesystem::createDirectory($log_dir, 0755, true);
	} catch (FilesystemException $ex) {
	throw new PhutilProxyException(
	pht(
	'Unable to write log "%s" to path "%s". The containing '.
	'directory ("%s") does not exist or is not readable, and '.
	'could not be created.',
	$this->getLogName(),
	$log_path,
	$log_dir),
	$ex);
	}
	}

	// If we created the parent directory, test if the path is writable
	// again.
	try {
	Filesystem::assertWritableFile($log_path);
	$write_exception = null;
	} catch (FilesystemException $ex) {
	$write_exception = $ex;
	}
	}

	// If we ran into a write exception and couldn't resolve it, fail.
	if ($write_exception) {
	throw new PhutilProxyException(
	pht(
	'Unable to write log "%s" to path "%s" because the path is not '.
	'writable.',
	$this->getLogName(),
	$log_path),
	$write_exception);
	}
	}

	ini_set('error_log', $log_path);
	PhutilErrorHandler::setErrorListener(array($this, 'onError'));
	}

	public function onError($event, $value, array $metadata) {
	// If we've set "error_log" to a real file, so messages won't be output to
	// stderr by default. Copy them to stderr.

	if ($this->logPath === null) {
	return;
	}

	$message = idx($metadata, 'default_message');

	if (strlen($message)) {
	$message = tsprintf("%B\n", $message);
	@fwrite(STDERR, $message);
	}
	}

	}

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