单击时,我有一个下载按钮,下载文件大约需要15秒钟,因为它必须通过SFTP进入服务器,找到正确的路径/文件,然后返回响应。
<a class="btn btn-primary btn-sm text-primary btn-download-1" onclick="startDownload('1')"><i class="fa fa-download "></i></a>
这是startDownload功能:
function startDownload(interfaceId) {
window.location = "/nodes/interface/capture/download?port=" + interfaceId;
}
/nodes/interface/capture/download
中的后端代码:
public function download_files()
{
$dir = '';
$portNumber = Request::get('port');
$zipMe = false;
$remotePath = "/home/john/logs/".$dir."/";
if (!isset($dir) || $dir == null) {
return redirect()->back()->withInput()->withFlashDanger('SFTP Could not connect.');
}
$acsIp = explode('://', env('ACS_URL'));
$acsIp = explode(':',$acsIp[1])[0];
$sftp = new SFTP($acsIp.':22');
if (!$sftp->login('john', '***')) {
return redirect()->back()->withInput()->withFlashDanger('SFTP Could not connect.');
}
// Get into the Specified Directory
$sftpConn = Storage::disk('sftp');
$SFTPFiles = $sftpConn->allFiles('/'.$dir);
if ( count($SFTPFiles) > 0 ) {
foreach ($SFTPFiles as $file) {
$fileName = $file;
break;
}
} else {
\Log::info('Files Not found in the Remote!');
return redirect()->back()->withInput()->withFlashDanger('Files Not found in the Remote!');
}
// Create and give 777 permission to remote-files directory
if (!is_dir(public_path('remote-files/'.$dir))) {
mkdir(public_path('remote-files/'.$dir), 0777, true);
}
$filesToZip = [];
foreach ( $SFTPFiles as $fileName ) {
if ( $fileName == '..' || $fileName == '.' ) {
continue;
} else if ( $fileName == '' ) {
\Log::info('File not found');
continue;
}
$fileName = explode("/", $fileName);
$onlyFileName = (!empty($fileName) && isset($fileName[1])) ? $fileName[1] : "";
$filepath = $remotePath.$onlyFileName;
if (strpos($onlyFileName , $portNumber) !== false) {
// Download the remote file at specified location in Local
if (!$sftp->get($filepath, 'remote-files/'.$dir.'/'.$onlyFileName))
{
die("Error downloading file ".$filepath);
}
$file = public_path('remote-files/'.$dir.'/').$onlyFileName;
$headers = array(
'Content-Description: File Transfer',
'Content-Type: application/octet-stream',
'Content-Disposition: attachment; filename="'.basename($file).'"',
'Cache-Control: must-revalidate',
'Pragma: public',
'Content-Length: ' . filesize($file)
);
return Response::download($file, $onlyFileName, $headers);
}
// IF File is exists in Directory
if ( file_exists( public_path('remote-files/'.$dir.'/').$onlyFileName ) ) {
$filesToZip[] = public_path('remote-files/'.$dir.'/').$onlyFileName;
\Log::info('File Generated '.'remote-files/'.$dir.'/'.$onlyFileName);
// Remove Files from public/remote-files
$this->removeDirAndFiles('', public_path('remote-files/'.$dir));
exit;
} else {
\Log::info('File not Generated '.'remote-files/'.$dir.'/'.$onlyFileName);
}
}
}
此代码确实有效,但是耗时约15秒,对于用例而言太长了。
有没有办法加快速度?我的代码有什么问题吗?还是可以预期的?我应该考虑切换到SCP吗?我应该重新考虑身份验证吗?
答案 0 :(得分:5)
我更改了功能,以测量各个部分的时间,因此您可以通过查看该字符串“ ### [TIME]-”
public function download_files()
{
$start = time();
$dir = '';
$portNumber = Request::get('port');
$zipMe = false;
\Log::info("### [TIME] -- t1 = " . (time() - $start));
$remotePath = "/home/john/logs/".$dir."/";
if (!isset($dir) || $dir == null) {
return redirect()->back()->withInput()->withFlashDanger('SFTP Could not connect.');
}
$acsIp = explode('://', env('ACS_URL'));
$acsIp = explode(':',$acsIp[1])[0];
$t1 = time();
$sftp = new SFTP($acsIp.':22');
$t2 = time();
\Log::info("### [TIME] -- SFTP Instantiation took " . ($t2 - $t1) . " secs");
if (!$sftp->login('john', '***')) {
return redirect()->back()->withInput()->withFlashDanger('SFTP Could not connect.');
}
$t1 = time();
// Get into the Specified Directory
$sftpConn = Storage::disk('sftp');
$SFTPFiles = $sftpConn->allFiles('/'.$dir);
$t2 = time();
\Log::info("### [TIME] -- SFTPFiles list took " . ($t2 - $t1) . " secs");
// this loop is not clear to me, you basically take the first element and
// exit the loop
if ( count($SFTPFiles) > 0 ) {
foreach ($SFTPFiles as $file) {
$fileName = $file;
break;
}
} else {
\Log::info('Files Not found in the Remote!');
return redirect()->back()->withInput()->withFlashDanger('Files Not found in the Remote!');
}
$t1 = time();
// Create and give 777 permission to remote-files directory
if (!is_dir(public_path('remote-files/'.$dir))) {
mkdir(public_path('remote-files/'.$dir), 0777, true);
}
$t2 = time();
\Log::info("### [TIME] -- Directory creation took " . ($t2 - $t1) . " secs");
$filesToZip = [];
$t1 = time();
foreach ( $SFTPFiles as $fileName )
{
$start_loop_time = time();
\Log::info("### [TIME] -- Loop for $fileName took " . (time() - $t1) . " secs");
if ( $fileName == '..' || $fileName == '.' ) {
continue;
} else if ( $fileName == '' ) {
\Log::info('File not found');
continue;
}
$fileName = explode("/", $fileName);
$onlyFileName = (!empty($fileName) && isset($fileName[1])) ? $fileName[1] : "";
$filepath = $remotePath.$onlyFileName;
if (strpos($onlyFileName , $portNumber) !== false) {
$responseCreationStart = time();
// Download the remote file at specified location in Local
if (!$sftp->get($filepath, 'remote-files/'.$dir.'/'.$onlyFileName))
{
die("Error downloading file ".$filepath);
}
$file = public_path('remote-files/'.$dir.'/').$onlyFileName;
$headers = array(
'Content-Description: File Transfer',
'Content-Type: application/octet-stream',
'Content-Disposition: attachment; filename="'.basename($file).'"',
'Cache-Control: must-revalidate',
'Pragma: public',
'Content-Length: ' . filesize($file)
);
$responseCreationEnd = time();
\Log::info("### [TIME] -- Response creation took " . ($responseCreationEnd - $responseCreationStart ) . " secs");
return Response::download($file, $onlyFileName, $headers);
}
// IF File is exists in Directory
if ( file_exists( public_path('remote-files/'.$dir.'/').$onlyFileName ) ) {
$t3 = time();
$filesToZip[] = public_path('remote-files/'.$dir.'/').$onlyFileName;
\Log::info('File Generated '.'remote-files/'.$dir.'/'.$onlyFileName);
// Remove Files from public/remote-files
$this->removeDirAndFiles('', public_path('remote-files/'.$dir));
$t4 = time();
\Log::info("### [TIME] -- Deletion took " . ($t4 - $t3) . " secs");
exit;
} else {
\Log::info('File not Generated '.'remote-files/'.$dir.'/'.$onlyFileName);
}
\Log::info("### [TIME] -- Loop end reached in " . (time() - $start_loop_time ) . " secs");
}
}
答案 1 :(得分:1)
您是否在代码中的任何地方设置了$dir
变量?因为按照我的阅读方式,它的唯一内容是而且永远都是一个空字符串。
这在其他浏览器中也需要很长时间吗?按下按钮后,浏览器检查器的“网络”选项卡中是否弹出任何值得注意的东西?
此外,也许您可以尝试将函数放在按钮元素中而不是超链接中。
也许这种延迟是浏览器内部存在的某种超时,因为它期望加载另一个页面?
因此,建议您尝试一下该按钮,而不是使用该按钮的超链接:
<button class="btn btn-primary btn-sm text-primary btn-download-1" onclick="startDownload('1')"><i class="fa fa-download "></i></button>
我很好奇会发生什么。 让我们保持最新状态!