/**
* 下载网页，得到网页内容
*
* @param mixed $url
* @param mixed $options
* @return void
* @author seatle <*****@*****.**>
* @created time :2016-09-18 10:17
*/
public function request_url($url, $options = array())
{
//$url = "http://www.qiushibaike.com/article/117568316";
$link = array('url' => $url, 'url_type' => isset($options['url_type']) ? $options['url_type'] : '', 'method' => isset($options['method']) ? $options['method'] : 'get', 'headers' => isset($options['headers']) ? $options['headers'] : array(), 'params' => isset($options['params']) ? $options['params'] : array(), 'context_data' => isset($options['context_data']) ? $options['context_data'] : '', 'proxy' => isset($options['proxy']) ? $options['proxy'] : self::$configs['proxy'], 'try_num' => isset($options['try_num']) ? $options['try_num'] : 0, 'max_try' => isset($options['max_try']) ? $options['max_try'] : self::$configs['max_try']);
// 设置了编码就不要让requests去判断了
if (isset(self::$configs['input_encoding'])) {
requests::$input_encoding = self::$configs['input_encoding'];
}
// 得到的编码如果不是utf-8的要转成utf-8，因为xpath只支持utf-8
requests::$output_encoding = 'utf-8';
requests::set_timeout(self::$configs['timeout']);
requests::set_useragent(self::$configs['user_agent']);
// 是否设置了代理
if (!empty($link['proxy'])) {
requests::set_proxies(array('http' => $link['proxy'], 'https' => $link['proxy']));
// 自动切换IP
requests::add_header('Proxy-Switch-Ip', 'yes');
}
// 如何设置了 HTTP Headers
if (!empty($link['headers'])) {
foreach ($link['headers'] as $k => $v) {
requests::add_header($k, $v);
}
}
// 如果设置了附加的数据，如json和xml，就直接发附加的数据,php端可以用 file_get_contents("php://input"); 获取
$params = empty($link['context_data']) ? $link['params'] : $link['context_data'];
$method = strtolower($link['method']);
$html = requests::$method($url, $params);
//var_dump($html);exit;
$http_code = requests::$status_code;
if ($this->on_status_code) {
$return = call_user_func($this->on_status_code, $http_code, $url, $html, $this);
if (isset($return)) {
$html = $return;
}
if (!$html) {
return false;
}
}
if ($http_code != 200) {
// 如果是301、302跳转，抓取跳转后的网页内容
if ($http_code == 301 || $http_code == 302) {
$info = requests::$info;
$url = $info['redirect_url'];
$html = $this->request_url($url, $options);
} else {
if ($http_code == 404) {
log::error(date("H:i:s") . " Failed to download {$url}\n");
//log::error(date("H:i:s")." Download page {$url} failed, Read timed out, will try again later\n");
log::error(date("H:i:s") . " HTTP CODE: {$http_code} Not Found\n");
} elseif ($http_code == 407) {
// 扔到队列头部去，继续采集
$this->queue_rpush($link);
log::error(date("H:i:s") . " Failed to download {$url}\n");
log::error(date("H:i:s") . " Proxy server authentication failed, please check the proxy server settings\n");
} elseif (in_array($http_code, array('0', '502', '503', '429'))) {
// 采集次数加一
$link['try_num']++;
// 抓取次数 小于 允许抓取失败次数
if ($link['try_num'] <= $link['max_try']) {
// 扔到队列头部去，继续采集
$this->queue_rpush($link);
}
log::error(date("H:i:s") . " Download page {$url} failed, Read timed out, will try again later, retry({$link['try_num']})\n");
log::error(date("H:i:s") . " HTTP CODE: {$http_code} service unavailable\n");
} else {
log::error(date("H:i:s") . " Failed to download {$url}\n");
log::error(date("H:i:s") . " HTTP CODE: {$http_code}\n");
}
self::$collect_fail++;
return false;
}
}
self::$collect_succ++;
return $html;
}
