PhutilLogFileChannel.php
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	<?php

	/**
	* A @{class:PhutilChannelChannel} which wraps some other channel and writes
	* data passed over it to a log file.
	*/
	final class PhutilLogFileChannel extends PhutilChannelChannel {

	private $logfile;

	public function setLogfile($path) {
	$this->logfile = fopen($path, 'a');
	$this->log('--- '.getmypid().' ---');
	return $this;
	}

	public function read() {
	$buffer = parent::read();

	if (strlen($buffer)) {
	$this->log('>>> '.phutil_loggable_string($buffer));
	}

	return $buffer;
	}

	public function write($message) {
	if (strlen($message)) {
	$this->log('<<< '.phutil_loggable_string($message));
	}

	return parent::write($message);
	}

	private function log($message) {
	if ($this->logfile) {
	fwrite($this->logfile, $message."\n");
	}
	}

	}